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, Fri, 5 May 2006 17:57:05
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Checking the inner universal joints for grease was a good thought.
Another common cause of vibration is wear on the inner UJ cups. These UJs work via a T-shaped piece attached to the driveshaft (with roller bearing caps on the ends of the T) running in a slot in the cup (the part which goes into the transaxle.)
Over time, pressure of the bearing cap can wear a depression in the mating surface of the cup, on the "driving" side. If the cup is out of the car and cleaned, you can see and feel this depression inside the slot. If this depression is deep enough, it can cause vibration while accelerating.
The fix is simply to swap the cups side-for-side, so that a fresh driving surface is presented to the bearing cap. (Of course, with a super-high-mileage car, this might have been done already -- possibly more than once -- so you just have to swap so the least-grooved surface is driving.)
The only problem with this "simple" fix is that it's really difficult to do except when the drivetrain is out of the car! I've read that it's possible to do it with the engine/transaxle still in place, by unbolting the lower ball joint (WARNING -- NOT the upper ball joint -- it's under heavy pressure from the road spring, which can shoot out and kill you!) and swinging out the suspension upright to retract the outer driveshaft. Supposedly, if you do this far enough, it makes just enough room to pop the cup out of the transaxle. (The transaxle should be drained when you do this, because otherwise the fluid will come out.)
Still seems like a stretch to me, but you might want to give it a try if you're adventurous. Oh, yeah, while you have the cup out, you might as well replace the side seals if you don't KNOW they've been replaced recently -- they do develop leaks eventually, so it's a good precaution to replace them as long as you're making yourself miserable taking your front suspension apart, so you don't have to do it again later. WOS can sell you new seals.
posted by 68.227.170...
, Fri, 5 May 2006 17:58:09, Fri, 5 May 2006 17:57:05
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