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Driveline Lash
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http://www.clubcobra.com/forums/backdraft-racing/136680-driveline-lash.html)
| Kobura |
06-07-2016 11:34 AM |
Driveline Lash
The amount of lash in my drive train seems to have gotten worse and is irritating at times. When in first/second at low speeds it causes bucking motions that require slipping the clutch or coasting in order to eliminate it. Anyone have any comments on this issue?
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| Cashburn |
06-07-2016 12:20 PM |
Check all driveshaft bolts and most importantly that main diff bolt is very tight (like 3' breaker bar tight).
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| Grey 65 |
06-07-2016 12:51 PM |
Quote:
Originally Posted by Cashburn
(Post 1394086)
Check all driveshaft bolts and most importantly that main diff bolt is very tight (like 3' breaker bar tight).
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I'm with Jay... Either a loose FWD differential bolt or a broken FWD differential bolt.
Kevin..... |
| Brian John |
06-07-2016 03:52 PM |
Quote:
Originally Posted by Kobura
(Post 1394085)
The amount of lash in my drive train seems to have gotten worse and is irritating at times. When in first/second at low speeds it causes bucking motions that require slipping the clutch or coasting in order to eliminate it. Anyone have any comments on this issue?
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Had this issue I had a broken drive shaft bolt and for some reason it would actually grab and the vehicle would move but bucked in 1st. Though after bucking started I only drove it maybe 2 miles. |
| spdbrake |
06-07-2016 04:05 PM |
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| Gaz64 |
06-07-2016 05:27 PM |
Quote:
Originally Posted by spdbrake
(Post 1394096)
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That is a good point, is this an engine tuning/camshaft trait or driveline issue?
Gary |
| DanEC |
06-07-2016 05:31 PM |
Sounds like "trailer hitching". A healthy cam is usually part of the reason - but light springs on the centrifugal advance can aggravate it with advance swinging in and out with surges in the engine rpm. If it's gotten worse a thorough check of timing and carb settings might be in order.
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| cbreez |
06-07-2016 06:43 PM |
Don't worry just drive it...
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| Kobura |
06-08-2016 11:22 AM |
I checked for loose nuts and bolts on the driveshaft and for indications of anything loose. Everything appears to be tight. I grabbed both rear tires and rotated one of them that moved about an inch at the tread. The driveshaft rotated in synch with the tire. My conclusion is that the lash is in the transmission. Any comments?
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| Grey 65 |
06-08-2016 01:28 PM |
Quote:
Originally Posted by Kobura
(Post 1394173)
I checked for loose nuts and bolts on the driveshaft and for indications of anything loose. Everything appears to be tight. I grabbed both rear tires and rotated one of them that moved about an inch at the tread. The driveshaft rotated in synch with the tire. My conclusion is that the lash is in the transmission. Any comments?
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As Jay and I both said.. you need to check to see if bolt #17 has sheared. This bolt connects the front of the differential to the subframe.
RealOEM.com - Online BMW Parts Catalog
Kevin.... |
| Dirty Harry |
06-08-2016 03:18 PM |
bucking problem
My small block does this, too. I like my idle speed as low as possible. But, if I increase it a couple hundred RPM's, the bucking is no longer a problem.
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| Kobura |
06-08-2016 05:59 PM |
I verified that nothing is amiss with the differential attachment to the car frame for which I am very thankful as a loose differential could be disastrous. The schematic diagram of the e36 rear end was helpful although my hardware appears to be slightly different. e.g., hex socket bolts instead of hex head bolts and a different attachment scheme. So, unless I hear otherwise, I will follow the advise of our favorite BDR skeptic 'cbreez' and not worry and just drive it.
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