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Re: Clutch or transmission woes (long) - Paging Cmyles Posted by Cmyles [Email]  (#1126) [Profile/Gallery]
(more from Cmyles) on Wed, 30 Mar 2011 10:04:38
In Reply to: Clutch or transmission woes (long) - Paging Cmyles, Notnoel  [Profile/Gallery]
, Tue, 29 Mar 2011 07:16:28
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Dude,
If I read your post right the unit did not grind or have problems of any kind and then all of a sudden it grinds when shifting into second and third. Synchromesh components generally wear out gradually but more importantly second and third gear share no common elements except the mainshaft and cluster gear. A bent 1-2 shift fork, defective 1-2 slider or 1-2 hub, balk ring, spring, etc. won't affect third gear and vice-versa. So those two problems having the same sudden onset suggests that the cause is elswhere in the unit or under the hood.
The whirling noise may be the upper chainwheel bearing or chains. and other symptoms (including the lack of certain symptoms) suggest a problem with the cluster gear bearing(s) or thrust washer but it's pretty important to eliminate all those other possible causes before you resign yourself to dealing with a busted transmission. Clutch problems can manifest as a variety of shifting problems and I'd suggest that you undertake serious investigation of all the clutch parts including the cover, disc and pilot bearing. Clutch hydraulic components, especially the master cylinder, are notorious for malfunctioning suddenly. Logic would suggest that a clutch problem would affect all 5 synchromesh gears equally but that is not necessarily the case. Make really sure that the clutch is fully, not just partially, releasing.
If you can pinpoint the location of the whirling noise you will be a long way toward isolating the problem. Get a mechanic's stethoscope and spend some time with that. Remember that in order for the friction disc and engine to spin at different speeds (as when shifting gears) the pilot bearing must spin freely and the disc must slide along the shaft a bit.
Grinding in both second and third gears probably isn't the result of a shift linkage problem as the two gears are oppositely oriented but it never hurts to check. At some point you could remove the "dipstick" side cover and try to determine whether there is radial or excessive axial movement of the cluster gear. You probably won't be able to detect a bad front cluster bearing but if the rear cluster bearing is hurt you may get some noticable radial play. Of course if you detect no play it may still exist and just be hard to detect. Rolling the unit a few times may help.
That's just a few quick thoughts, let us know what further inspection reveals. Good luck
posted by 198.233....
, Tue, 29 Mar 2011 07:16:28, Wed, 30 Mar 2011 10:04:38 <-- Viewing This Message, Tue, 29 Mar 2011 17:54:41
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