Tim Has Terrible Noises After a Local Gear Install |
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(55 BIG pics loading) |
AUGUST 19 2016 |
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Fins and Things Trail, Moab |
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Tim is somewhere in Missouri and emailed me about the results of a local gear install from a local shop. After some email exchanges and a little while later, 2 strong boxes arrived. |
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The front 3rd member is in this box.... The actual front autopsy/rebuild can be followed here..... Front Inspection/rebuild |
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...and the really heavy rear 3rd is in the other. Both have ARBs. |
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This link is for the rear 3rd and it is shown secured to the fixture for a preliminary check-up. |
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Driveside....a pattern check shows that the pinion depth is extremely shallow. No wonder it was making terrible noises. Good thing Tim only drove it a few miles. |
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Coast reflects that. |
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Backlash was terribly wide at .019".....The carrier and pinion bearings were not unusually loose. |
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Teardown begins. I verified the arb held air pressure before removing this stuff. |
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Both adjuster wheels seemed locked up.....could not break them loose. |
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Finally managed to get them off. The arb wheel has raised lip damage from hits with a hammer and flat punch of some sort. |
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A flat surface and 100 grit sandpaper will fix the high spots like new again almost. |
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Some grooves in the arb journal. Still held air just fine but surprised to see so much wear. Thought it was a newish arb. |
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There was rust/corrosion in both of the wheel threads and that is why they seemed locked up and would not turn. A wire brush managed to clean them out like brand new almost. Shown above is after the brush was used but before the debri was flushed out. |
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Verified they were all at 81 ft/lb minimum and they were. |
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Even the drive side of the pinion shows the extreme shallowness that the ring gear experienced. |
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Flange was removed....a small groove here. |
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The seal has some corner issues.....interesting. |
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Pushing the pinion out now. |
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All looks ok here....some streaking marks on the new rollers but that could be contamination in the gear oil too. |
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The races look a little more "used" or older but can't be 100% sure. |
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Removing the pinion bearing..... |
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....and NO pinion depth spacer found. |
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Going to try .0595" for the 1st pinion shim check. |
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Pressing it back on with the Harborfreight 12 ton. |
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Loadings up the pinion assembly into the diff carrier. |
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Notice how clean and spotless the 4 bolts are here? Guess I should have taken a "before pic" because they were loaded up with carbon chunks and what appeared to be loctite. |
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The ring gear was now making full contact in this corner....guess that's why the shop had .019" backlash. |
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Nothing that 5 seconds with a flapper wheel couldn't fix in no time... After this clearancing, the carrier would fit just fine and backlash could be set to spec. |
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1st real pattern check and now the pattern has nice placement from toe to heel but it's a little too deep (face to flank) even for my tastes. |
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Coast. I know from past experience if I go down to .055 that it will be right where I want it. |
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Skipping some repetitive pics, the pinion shim was changed to .055" and a new crush sleeve is employed. A new pinion seal is ready to go on. |
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Gear oil is lightly applied to the related surfaces. |
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The new sleeve was crushed until a light 8 in/lb was recorded. |
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DING!! and this end is complete. |
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The case is re-installed and a total preload check is made...good....right at 15 in/lb. That means my carrier bearing preload is 15 - 8 = 7 in/lb. |
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That's what I like to see....a slight deep condition and very centered at that. |
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Coast....also very centered for good balance. Looks like a ufo.....proof that they do exist. |
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The drive on the pinion says perfect! This gearset will have maximum strength. |
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A final check on bearing cap torque.....70 ft/lb on all 4. |
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Backlash is recorded on every other tooth as shown in the notes at the end. |
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ARB seal housing assembly is in place and the retaining clip is installed as shown. |
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10+ ft/lb |
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Air check.....100 psi pass. |
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Final notes. |
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Boxing it up in the same double box. |
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Shielding the floor of the box with a conveniently sized Nitro box stuffed with packing materials inside. |
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