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Tech Talk : How to or other build advice (6 replies and 3 comments)

admin
9 months ago
admin 9 months ago

Please post technical build or repair advice here...

Rick1087
9 months ago
Rick1087 9 months ago

Forging Deep Water in a 4WD Offroad Vehicle

When you're off roading it often becomes necessary to cross water. Knowing how to drive through deep water (called forging) can allow you to successfully get through without getting stuck or hydrolocking your engine.
Once you get a foot or more deep you need to slow down. The deeper the water the slower you should go. In very deep water (more than a couple of feet) you'll want to drive about 3 or 5 mph in low gear, trying not to make a wake. Never drive in water deeper than your airbox unless you have a snorkel.

Hydrostatic lock is a failure of the internal combustion engine, where the unit can’t run due to fluid entering the combustion chamber above the piston and preventing it from completing its cycle. While the usual fuel-air mixture is compressible, allowing the piston to perform its reciprocation movement inside the cylinder, liquids are extremely difficult to compress, which means the affected piston(s) will come to a stop on the upstroke.

What can cause hydrolocking
Before we start talking about this unpleasant issue, we have to explain that water reaching the intake of your engine is not the only hydrolock cause. This can also occur due to engine coolant entering the combustion chamber (a blown head gasket causes this). Malfunctioning injectors or carburetors can also allow liquid fuel to enter the cylinder.

The Damage, in painful details
If a unit hydrolocks when idling, it will normally stop and will not allow you to bring it back to life using just the starter motor. This is happiest case, where you might not experience any damage at all.
Unfortunately, if an engine hydrolocks when being revved, the consequences can be dire. Depending on the height level of your intake and the depth of the water, as well as on the various on-site parameters, the amount of liquid that enters the engine can reach one or more cylinders.
You can experience a case where a single piston hydrolocks, while the others provide enough power to keep the engine running for a while. However, when hydrostatic locking occurs at speed, the unit will usually come to an abrupt stop.
Generally, when an engine hydrolocks at speed, the force of the camshaft pushing bends the piston rods, which are folded under the piston above them. While the crankcase or the heads can be ruined in the process and the crankshaft bearings destroyed, the shock can even cause cracks in the engine block.

The solutions
First of all, if you can’t avoid a... dive in your car, make sure you shut down the engine before the water has any chance of reaching the air intake. If this has already happened and the engine has stopped, do not try to restart it.
Actually, using the starter motor in the aim of bringing the engine back to life is the most common way to solve the problem (if no damage has occurred), but only after the combustion chamber has been given an orifice to eliminate the water through - this can be done by removing the spark plugs or the injectors.
You’ll notice the water being thrown out of the cylinders and the engine should start as normal afterwards. At a certain point, you can see a strange gas coming out of the exhaust, which is the result of the unusual mixture that was burned in the cylinders, but this problem should go away briefly.
Serious situations such as the ones described above (read: when the unit has been damaged) generally lead to problems so profound the engine needs to be replaced altogether, as trying to rebuild it after multiple major components have failed would only result in even greater costs.

<a href="http://www.autoevolution.com/news/engine-hydrolock-how-water-can-damage-or-destroy-your-engine-90270.html" rel="nofollow">http://www.autoevolution.com/news/engine-hydrolock-how-water-can-damage-or-destroy-your-engine-90270.html</a>
FAQ’s:
Can my muffler go under the water: Hydrolocking will only occur if you get water into the intake on the engine. The muffler under water is not a problem
Can I turn my engine on while submerged: If you have an auto, it’s safe to start anytime while submerged. If you have a manual, your jeep will start without engaging the clutch if you put the transfer case into 4LO and first gear on the tranny.
If I have a manual do I shift? Try to avoid clutching while under water. That being said, if you can’t help it, clutch and get your components checked afterwards.
Do I need to change my Diff fluids if I submerge my jeep? Everytime you submerge your Jeep above the Differentials you should check your fluids. If they appear to be milky then you should change your fluids. Refer to your owner’s manual for routine maintenance.
cylinder rod
What if I get stuck, pulled out, and my engine is under water for a while? Do not attempt to crank the engine until you remove all spark plugs, change the oil and make sure everything is clean and free of water. Did you know if you have water in the cylinders it can bend the rods? Once you have cleared the water from the oil, you can crank the engine without the spark plugs, if there is water you will see if fly out of the plug holes.
If I get stuck and I’m submerged do I turn my jeep off or keep it running? Never shut if off, all the pressure coming out of the motor is your friend. You can hydrolock with water coming up the back, too.

Should I install a snorkel?

ARB Snorkel

Many off roaders have seen Jeeps that have a snorkel installed, the important question is do you need one on your Jeep. First let us explain what a snorkel is and then you can decide if your Jeep is in desperate need of one. A snorkel is a pipe-looking accessory that runs from the air intake under the hood and extends upward on the passenger side of the vehicle. The primary function of a snorkel is to provide the engine with cool, dry, clean air while off roading.
Along with providing clean, dry and cool air to your engine, a snorkel can also help prevent water and dirt from entering the engine. Providing your engine with cool air increases the amount of horsepower, improves the performance of your engine and will help your vehicle last longer. Using a snorkel allows you to keep your air intake free of water and mud if you cross any deep streams or rivers while off roading. If you are off roading in a dry dusty area, a snorkel will prevent dust and dirt from being pulled into your engine.

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Big Red 1
9 months ago

Radiator fans and starters should not run while under water.. a starter can be ruined by just a few starts while submerged (pull Jeep out of water before cranking). Put a 'kill' switch on fan, it keeps fan from spraying muddy water ALL over engine compartment while saving motor, its hard on fan motor to run under water AND turn the blades in water, engine will remain cool from contact with water.

Rick1087
9 months ago
Rick1087 9 months ago

Different Lockers for Jeeps

ARB Air Locker
Overview: An ARB Air Locker operates as a normal open differential when not engaged. When engaged, a collar is pneumatically moved to lock the spider gears, creating a spool. When locked, both axleshafts turn at the same rate, whether in a front or rear application.

Street:
If you like the way your open diff behaves on the street, then an ARB is for you; it goes unnoticed. Or you can lock it up and chirp tires when parking to impress the ladies.
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Off-road:
As long as you feed it the required air pressure, the ARB locks and unlocks crisply and predictably off-road. We haven't had any need to jockey the vehicle around to get gears and pins to line up. It's on when the button is on and off when the button is off. When engaged, both wheels spin at the same rate, but offer the flexibility of being turned off for super-tight turning. Makes a great front differential for twisty trails.
Good: Highly versatile, delivering excellent balance between on- and off-road requirements. Differential is very strong and can take the shock of an axleshaft snapping under load without failing.
Bad: One of the most expensive lockers out there per application. The air lines can be vulnerable to obstacles. Requires a source of onboard air. Lots of things that can go wrong if not installed properly. We've suffered a few internal seal leaks either from high mileage or contaminated oil. The result is gear oil traveling up the air line and out the solenoid purge orifice. On two of our units, air leaks from the seals kept the unit from locking.

Rubicon TJ TFS Air Locker
Overview: The good news is that if you bought an '03-'06 Wrangler Rubicon, you got a pair of these for free. The Rubicon's pneumatically-operated TFS lockers featured an open/spool configuration in the front and a gear-driven limited slip/spool configuration in the rear.

Street:
See Truetrac listing for more information.
Off-road:
The units are unintrusive when unlocked and offer spool-like traction when locked. Aside from very few compressor or air line troubles caused by trail debris, the lockers themselves are extremely durable and most of the time are quick to lock or unlock. Off-road, they've proven themselves for use with tires up to and over 37-inches in diameter with no ill effects.
Good: Long-lived durability, and exceptional off-road performance.
Bad: They're not exactly cheap or very easy to come by unless you're starting with a Rubicon or a set of replacement axle housings. Also, the lockers require a very low-pressure (3-5psi) source of air or you can blow out internal components.
Auburn Limited Slip
Overview: The Auburn Limited Slip uses cone and friction materials to create enough friction to hold the axleshafts together. When enough torque bias is realized between the two shafts, the clutches give and allow differentiation of the shafts. In layman's terms, it grabs until it can't grab anymore, then it turns.

Street:
You'll hardly know you've got an Auburn in the rear of your vehicle unless you make enough power to spin the rear tires-then, just look for the two black patches on the pavement. We never experienced chirping or handling quirks when driving it.
Good: The Auburn's excellent street manners and decent traction off-road make it a good choice for daily drivers and mild wheeling vehicles.ter text here.
Bad: Requires gear oil with a friction modifier and some installations require slight modifications to the housing. If you're running 33s or bigger and hit some harder terrain, your off-road performance probably won't be that satisfactory. The unit has wearable parts inside and cannot be rebuilt at home. It must be sent back to the factory for refurbishment, which may be required after 100K miles of normal enthusiast usage.xt here.

Detroit Locker
Overview: The Detroit Locker is an automatic locker that uses heavy springs and geared teeth to allow the outside wheel to spin faster when turning. In most applications the Detroit Locker is a replacement case, but for some axles-such as for the GM 14-bolt, Dana 70, and Rockwell-it drops into the stock carrier. We like them for front applications best, but have used them in the rear of longer-wheelbase vehicles with much success.

Street:
Keep in mind we've tested Detroits in short- and long-wheelbase vehicles. In a longer vehicle, the handling drawbacks aren't as bad, but the short stuff (like Wranglers) earns this locker a bad on-road score. Whether you're turning or going straight, or if you're on the gas, a Detroit Locker behaves just like a spool. When you let off the gas, the Detroit will unlock. This is especially noticeable in a rear application of a high-horsepower, manual-transmission, short-wheelbase vehicle-such as a V-8 Jeep-and the resulting loading and unloading can cause a violent jerking that you need to get used to. We've driven rigs with super-supple suspensions or no sway bar that have changed lanes from the action.
Off-road:
A Detroit Locker is a really strong differential, and about the only way we've seen them break is when they're violently loaded and unloaded-like when an axleshaft breaks. This vulnerability is the only reason the Detroit loses one point in the judgment. While you can lose some ability to turn when using it in a front application, we've had little trouble snaking through tight spots by modulating the gas pedal to allow the front differential to unlock periodically for tighter turning. We like the no-brain traction with no buttons to push or levers to pull.
Good: Tough as nails, no brain required to operate, insane traction when on the gas, and OK for front and rear applications.
Bad: On-road handling quirks, susceptible to damage from a broken axleshaft, and can be a little rough on the street in the rear of short Jeeps.

Ox Locker
Overview: An OX locker is a cable-operated locker. When disengaged, it's an open differential. When it's locked, it's a spool. The cases are burly, and the diff covers are heavy steel built to withstand rock hits and prevent deflection of the shift mechanism.
Street:
Since it's an open diff when unlocked, it's unnoticeable on the street. Make sure the cable is adjusted properly, or you may sense some ratcheting as the locking toothed gear attempts to drop into place.
Off-road:
Works well as a front or rear diff to help keep axle parts alive and allow you to turn more sharply. Older non-spring-loaded shifters can be difficult to engage in tight situations, but most of those have been swapped out and are off the market by now. The new version of the shifter is much better and easier to use.
Good: It's extremely strong and is an open diff when you want it, or a spool when you want it. Great for a daily driver or hard-core abused Jeep. Perfect for front and rear applications. Comes with a bomb-proof differential cover, and the beefy locking spool design will survive a catastrophic shaft or U-joint failure.
Bad: The cable must be adjusted properly or the unit will not function correctly, so make sure it's installed by somebody whose primary diet isn't bananas and peanuts from the zoo. Early shifter can be difficult to engage. The heavy industrial cable coming out of the cover can be vulnerable to trail debris in some applications. Also, the heavy cable needs to be routed into the cab, and the shifter is somewhat inconvenient to try to locate cleanly in a Wrangler or other vehicle with a small interior.

Detroit Truetrac
Overview: The Truetrac is a gear-driven limited slip that requires no special friction modifiers to operate. That means that the bozo at the Qwikee Lube can't destroy your spendy limited slip by putting the wrong oil in. Under power, torque is sent to both tires unless there's an excessive amount of resistance on one.
Street:
The Truetrac is very unobtrusive on the street. When gassed in a corner or turn, you may feel the slightest pull, but there's no jerking or violent engagement of any sort. When under heavy throttle in a turn, the inside tire will bark a little, but not under normal driving conditions. Turning radius and tight maneuvers are totally unaffected.
Off-road:
The Truetrac offers near locker-like traction in all but the gnarliest terrain. We've found that modulating the brakes a bit can help keep one tire from spinning when the suspension is crossed up. You can't drive as elegantly in the rocks as you can with a spool or locker, but you'll have to work pretty hard to get stuck. In loose dirt twisties where you're lifting a tire, a Truetrac will almost always get you through.
Good: Great traction on- and off-road and can use straight 90W gear oil. They're moderately priced and great for front and rear applications.
Bad: There are a lot of little parts inside, so it's not as strong as most full-case lockers. Also, it doesn't offer as much traction as a locker or spool, and you may slightly notice it operating during some street driving.
Power-Lok
Overview: The Power-Lok is a clutch-driven limited slip unit and is considered a stronger, heavy-duty version of the Trac-Lok. Power-Loks are commonly found as the optional limited slip in older Jeeps. New units are produced by Precision Gear.

Street:
When worn out, you'll think it's an open diff. But even new, it's hardly noticeable on the street.
Off-road:
Again, when the Power-Lok is worn out, you'll think it's an open diff. Modulating the brake pedal helps make the Power-Lok come alive and provide impressive slightly-better-than-open-carrier traction. We give them a solid "eh."
Good: Came factory in some M38A1s and other early Jeeps, so you may already have one. They're stronger than most other limited slip cases, and can be used in front and rear axles without adverse effects.
Bad: They require gear oil with a friction modifier and have wearable clutches, which can be replaced at home. Not for the extreme and not a replacement for a full locker.

Wrangler JK TFS Electric Locker
Overview: When Jeep upgraded the Wrangler line to the '07-up JK platform, the old pneumatically-actuated lockers of the TJ Rubicons got the heave-ho in favor of the new electronically-actuated selectable lockers. Although they only fit Rubicon Dana 44 housings, the TFS Dana 44 Rubicon lockers markedly simplify the installation of Rubicon axles in a non-stock application, requiring only a switched source of 12V power to actuate.

Street:
Hey, when it's off it's an open diff. No drawbacks here.
Off-road: To be somewhat picky, we've found the JK Rubicon axles sometimes need to be locked 20-30 feet before you need them, rather than when you're already stuck. When locked, they effectively function as a spool, offering uncompromising traction in any and all terrain. That is, as long as your tires are up to the task.
Good: It's got millions of dollars in factory-funded research and development behind it. They just work.
Bad: They only work in JK Rubicon Dana 44 axle assemblies, so you can't just plunk one in your '76 Wagoneer front axle.

Trac-Lok
Overview: The Trac-Lok is the OEM limited slip differential offered in many vehicles-from early CJs from the mid-'70s up through XJs and some TJs. It uses stacks of friction discs that hold the spider gears from differentiating until enough torque is generated by the shafts to let them spin.
Street:
You'll think you're driving an open diff. The Trac-Lok is largely unnoticeable.
Off-road:
You'll think you're driving an open diff. The Trac-Lok is largely unnoticeable. Unless it's new from the factory, don't expect anything but poor performance off-road from a Trac-Lok.
Good: It probably came in your Jeep from the factory. The unit can be rebuilt at home.
Bad: They require gear oil with a friction modifier and have wearable clutches inside. If you're planning on adding a lunchbox locker, you'll need to order a special application that will work with the clutch disc recess in the case. The recess inside of the case makes it slightly weaker than a standard open diff case. It's difficult to weld into a spool if that's your thing. Basically, they don't work well, so don't waste your money. You're better off with an open diff.
Spool
Overview: A spool is just a solid chunk of metal that connects your axleshafts together permanently and forever. A mini-spool drops inside your factory carrier and replaces the spider gears. A full spool replaces your existing carrier and is what you should run, if possible. Don't run a spool in the front, 'cause you ain't a gonna be able to turn; they're for rear applications only.
Street:
A spool is noticeable on the street when cornering sharply, but is very predictable, and we actually prefer one in the rear of a short-wheelbase vehicle over an automatic locker. Since there's never any loading or unloading, you don't get the jerking or banging associated with automatic lockers. It will increase your turning radius somewhat, and you'll notice your rear tires will scrub and chirp around corners.
Off-road:
Since a spool never unlocks, it's extremely predictable off-road. And since it's a solid chunk of metal, we've never been able to harm one. We haven't really found the loss of turning radius to be a hindrance. That's what Reverse is for. We hypothesize that a spool is actually easier on axleshafts off-road because there's never any sudden loading or unloading. Power is always evenly distributed to both shafts, and traction is generally phenomenal.
Good: Inexpensive, simple, lightweight, and strong.
Bad: Tires will chirp when turning on pavement, tire wear is increased, and the turning radius increased. Really only for a rear-axle application that's primarily used off-road.

Welded Diff
Overview: In a normal open differential, a set of spider gears allows the axleshafts to spin at different rates for smooth turning. Welding these gears together and then to the differential case sides creates a poor-man's spool.
Street:
Overall, the welded diff will behave just like a spool. In some instances where the axleshafts are of a smaller diameter (1.30-inch and smaller), there may be some torsional loading and unloading of the axleshafts when used with sticky tires. This will make for more tire squeal and chirping when turning. Basically, the welded diff loses a point to the spool because of the potential for the welds to break, not due to any difference in performance.
<strong.off-road:<strong>Again, it loses a point to the spool because of the potential for failure, but as long as your welds hold, you're good to go. Like a spool, we wouldn't recommend a welded diff for a front application. We pulled our welded Trac-Lok apart after about 30,000 road and trail miles and found that a crack was beginning to develop in a weld near the side of the case. Left alone, the weld could fail, sending chunks of diff into the gears and bearings. So if you decide to run a welded diff, plan on checking it frequently.
Good: Dirt cheap and gives great traction.
Bad: It's pretty butch, and the finished product will only be as good as your welds and the strength of the stock case. It's really only good for some rear-axle applications that are used primarily off-road.

Gov-Loc
Overview: Manufactured for General Motors by Eaton, the Gov-Loc is really a marvel of engineering. It functions as an open diff when unlocked. When the difference in wheelspeed from one side to the other reaches a certain point, centrifugal weights expand and cause the differential to go from an open to locked diff in milliseconds.
Street:
It's fine when it's functioning as an open diff, but wheelspin is actually required to get a Gov-Loc to engage. Usually, once there is enough wheelspin present, the vehicle bangs and jerks when the locker engages. It just feels violent-and we're sure it is.
Off-road:
Like the street, the Gov-Loc requires a fair bit of wheelspeed before it will engage. You really feel like you're about to blast off, then BANG, away you go. The violence with which a Gov-Loc engages is one reason we see so many of them being replaced at our local 4x4 shop. Once you add larger tires or hit some hard off-road trails, the Gov-Loc usually blows its fine, Swiss-watch-like internals to dust.
Good: Available in many factory GM 10-, 12-, and 14-bolt rear axles.
Bad: They're not durable and you'll almost certainly be replacing it with one of the other aftermarket differentials listed in this story.
Lunchbox Lockers
There are tons of drop-in lockers designed to replace your factory differential gears. We've used several with generally poor results. While we consider lunchbox lockers a good beginner or temporary locker, we wouldn't count on one as a permanent modification. Many of the companies that make lunchbox lockers also make full-case lockers, so if you've got the money, step up to the plate. Their operation and installation are similar enough that we'll lump their performance into one general category, then give more detailed descriptions below.
Overview:
Is a replacement for spider gears that fits inside stock differential carrier. Geared teeth and springs unload when coasting and lock under power.
Street:
Acts like normal automatic locker, so normal jerks and banging associated with automatic lockers apply.
Off-road:
Locker-like traction when working properly, but gear teeth are susceptible to wear and failure. When worn, it may not lock or unlock smoothly. When the unit fails to lock, it will leave you with no drive in that axle. Very susceptible to damage from axleshaft failure, and strength of stock carrier can be a factor.
Good: Inexpensive, easy installation, no gear setup required. Can be used in front and rear applications.
Bad: Generally is weaker than full-case counterparts, wears quicker, strength limited to stock carrier.

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Driving_Miss_Daisy
9 months ago
Driving_Miss_Daisy 9 months ago

Wow

Rick1087
9 months ago
Rick1087 9 months ago

Tire Wear Patterns Using Chalk

So you got your new mud tires and you’re ready to drive to the next jeep meet up or wheeling spot one of the most important things you've got to do to keep those expensive tires lasting as long as possible is to find the proper air pressure they need to run at for your given rim size and tire width and the overall weight of your Jeep. Everybody's Jeep is different as far as set up goes and it’s important you monitor your tires wear patterns or you could be wasting money in the form of uneven wear due to improper tire inflation. There is a very simple method of using chalk that could save the life of your tires just by setting them at the right pressure. First things first you'll need to get is some chalk and a section of road to drive that is safe for you to get in and out of your jeep while testing. The color of the chalk doesn't really matter but I find that white shows up the best for tire testing.
Now that you've got your chalk let’s begin by marking about a 2" wide mark across the entire contact patch of the tread on all 4 tires and take a test drive as straight as possible for about 1/8 of a mile and then while staying on the asphalt look at each tire and read the results from the chalk test. What we are looking for is even wear of the chalk marks across the treads if not then we need to address what is causing the unusual wear pattern. If the chalk is wearing off in the centers of the tires this is a sign of over inflation of this given tire and wheel combination (of course keep in mind that if you’re running a 15" wide tire on a 8" wide rim you'll be hard pressed to get them to wear evenly without having to run a dangerously low tire pressure) if the chalk is wearing on the centers you'll need to lower the air pressure say maybe by 5psi at a time and test them again were not looking for a pressure number per say but more so an even wear pattern across the tread. If your chalk is wearing the shoulders of the tire this tells us that the tire pressure is too low and need to be increased for further testing to get them to wear evenly across the entire tread width. Though this process may take a little time it will be well worth it down the road with increased tire life and longevity. Once the lines wear off evenly, please note those pressures for future reference. While the inflation must be identical for both ends of an axle, the front tires will often require a slightly higher pressure since they usually carry more of the weight of an unlading vehicle (most engines are up front).

It doesn't really matter how accurate your tire gauge is as long as it's consistent and you use that same gauge every time. Also important for repeatability is to measure the tires either cold or warm, then stick with that measurement method since tire pressure vary quite a bit with temperature. Last, but not the least, if adding load to the vehicle, don't forget to add to the tire pressures accordingly

Not only important for longer tire life... But for safety and performance! Also important is the difference tire pressure used off road vs. on road. While off road significantly low pressures are used to increase the contact foot print which vastly improves traction. Be careful not to go too low... This allows the tire to spin on the rim or worst pop the bead. This is commonly avoided by bead lockers which can be either internal or external clamping the tire to the rim. A quick and easy way to transition between on road and off road pressures in auto deflators. These are spring loaded valves that when set properly will lower all of your tires automatically. Simply screw them onto the valves stems and let them do the job. When they stop hissing simply remove them and re install the caps.

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Rick1087
9 months ago
Rick1087 9 months ago

Gearing/ Tire size Calculator

Good site for comparing different gearing and tire sizes. Ideally change differential gears for proper engine RPM's on highway, change Transfer Case ratios for off-road performance. For Rock Crawling a final drive ratio of 130 or higher is best. Best gas mileage on highway will be an RPM @ 75-100% of the Max Torque RPM for your particular engine.

<a href="http://www.grimmjeeper.com/gears.html" rel="nofollow">http://www.grimmjeeper.com/gears.html</a>

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Rick1087
9 months ago
Rick1087 9 months ago

Winching/ Recovery

EVERYTHING 😯 you need to know about winching... Found the Roll-over stiff-leg section interesting

<a href="http://www.pirate4x4.com/tech/billavist" rel="nofollow">http://www.pirate4x4.com/tech/billavist</a> ... index.html

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YJeepKan
9 months ago

Great Job Mr. VP ... Hope getting all these posted hasn't interfered with your golf game and baby kissing schedule 🙂

admin
9 months ago

hey look it's Gertrude... and Linda is helping her out of a MUCKY High centered situation...

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