Posted by Theman on December 23, 2008 at 11:11:10 from (65.248.77.5):
In Reply to: M-questions posted by GertM on December 23, 2008 at 08:56:22:
Look at the wear patterns on the bull gear teeth. One side will be shinier than the other. The shiny (or wear) side should be visible on the upper part of the gear if you're standing behind the PTO shaft.
The bull gear spline can fit either way on the axle. But if you have them wrong, the teeth won't be aligned with the teeth on the brake pinion shaft. The flatter side of the bull gear goes toward the axle housing.
Some gap is necessary for the bevel gears. I can't recall exactly what the backlash spec is (.012" comes to mind) but if you can't get a .010" feeler gage between the teeth at the contact point, they're too close. If you have more than .025" there is too much backlash.
Head cracks can be anywhere. Even if it doesn't leak coolant, you can still have a crack. They mostly appear around the combustion chambers. The only way to know for certain is to have the head magnafluxed. It will have to be off the engine for this.
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