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Re: 5 Speed Expert Needed! Posted by CMyles [Email] (#1126) [Profile/Gallery] (more from CMyles) on Fri, 18 Aug 2006 21:39:18 In Reply to: 5 Speed Expert Needed!, sobtom, Fri, 18 Aug 2006 18:33:11 Members do not see ads below this line. - Help Keep This Site Online - Signup |
sobtom,
Consider that "locking up" will originate either with the primary drive, the geartrain, the final drive or the axle(s) or brake(s). The fact that it will move a few feet suggests that there is either a set of gears failing to mesh properly or there is an axle or brake problem. With a car that's "new to you" any of these things is equally possible so investigate them starting with the easiest. If you are lucky this a brake or C.V. problem. When a tripod bearing escapes the inner driver it will bind against the rim of the inner driver and can allow some rotation before it really jams up hard. That happens when someone installs the wrong length replacement axle. You'll be able to feel that through the boot on the inner driver or see it by unclamping and slipping the boot back. Pop off the rear transmission cover off and look for metal fragments and flakes. Take the front cover off of the transmission and inspect the primary drive chains and sprockets. Pop the side covers off of the transmission and inspect for evidence that the cluster shaft is flapping (oscillating off center) on broken bearings or that the main (pinion) shaft is flapping on badly worn bearings. If those shafts don't roll on good bearings their gears go off center and mesh improperly and can lock up. I've seen pinion housing bearings so blown that the main shaft could move several millimeters off center at which point the final drive would lock up hard. Reversing the torque flow through the transmission would wind the rollers of the bad bearing around to the other aspect and then lock up the final drive again, so the car would move a few feet each way. That may be your condition and that's too bad (and too common) but always check the easy and simple stuff first. Plenty of smart people have pulled out suspect transmissions only to find that they actually had an axle problem. The front main shaft bearing can break down, the input shaft bearings can break down and the upper chainwheel bearing can seize up or break down. Problems with the differential side bearings are sort of rare unless someone played fast and loose with the preload/backlash shims once upon a time. Any of those failures would make gears mesh poorly. If it's truly "locking up" after rolling a bit that's not likely to be caused by a shift control or synchro-mesh problem. Pick away at it and good luck.
posted by 206.123.221...
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