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Re: CMYLES you out there? Posted by CMyles [Email]  (#1126) [Profile/Gallery]
(more from CMyles) on Fri, 10 Nov 2006 10:18:57
In Reply to: CMYLES you out there?, whitesaab, Fri, 10 Nov 2006 05:19:37 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Whitesaab,
He's right, the wandering reverse idler is a long shot. It's just an easy, quick thing to check that would cause your problem. I have seen a few reverse idlers which were not linked up but they were not causing lock-up. You related that the car would remain locked up until you shifted into (and I assumed) out of reverse and that's what triggered my train of thought there. Also you said that the car drives fine and with a pinion bearing problem I'd have expected some noise and difficulty shifting. That's usually the first thing you notice when you get in a car with blown pinion bearings.
What is almost always the case is that the mainshaft (pinion shaft) is oscillating in worn pinion bearings. A common sight upon disassembly is a pinion bearing (usually the rear one) where, due to advanced wear, the roller cage has broken so the spacing between the rollers is not controlled. The rollers then bunch up on one side of the bearing and the shaft moves off center. That can cause the ring and pinion to lock up and often breaks teeth from those gears. Reversing the rotation of the pinion shaft may spread the rollers and allow the shaft to re-center. That's probably why shifting into reverse unlocks your tranny.
Sorry if it seems that I mislead you. I don't recall ever removing a gearbox that upon disassembly wasn't found to need removal, but I have fixed quite a few in the car after peeking through the covers. One of my favorites is the escaping snap ring at the front end of the cluster gear assembly. Guys rebuild these and put the splined sleeve on backwards then at some point the sleeve slides forward pushing the snap ring ahead of it and the cluster input gear spins without turning the main cluster gear so there is no movement in any gear. Sliding the sleeve back and wiring the snap ring so it can't escape it's groove is done through the fifth gear side cover and the car is fixed. So I'm predisposed to wanting to look through the inspection plates before I condemn a unit to removal and rebuilding.
I've never seen a pinion housing bolt back out and cause the final drive to lock. Those bolts are (supposed to be) "Loctited" and anyway I think the gears would shear that 8 mm bolt off and throw it aside rather than lock-up at speed. The loss of one of the four bolts wouldn't effect the placement of the pinion housing. Removing the rear cover should allow you to see the four bolts (you may need a mirror and light).
By the way, if you go to rebuild that '84 gearbox you'll have to recondition the crush sleeve as they are NLA. Put it on the pinion shaft or similar steel shaft and tap around it's circumference until it gets a few thousandths longer. They seem to work just fine on the second go-round.
Cheers
posted by 206.123.221...
, Fri, 10 Nov 2006 10:18:57 <-- Viewing This Message
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