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Post By Cashburn
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06-07-2016, 10:34 AM
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![Kobura's Avatar](http://www.clubcobra.com/forums/image.php?u=48956&dateline=1361470487) |
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Join Date: Jan 2012
Location: Saratoga,
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Cobra Make, Engine: Backdraft RT3 #1133, Ford Racing 306
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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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![Old](/forums/images/statusicon/post_old.gif)
06-07-2016, 11:20 AM
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![Cashburn's Avatar](http://www.clubcobra.com/forums/image.php?u=22094&dateline=1188907758) |
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Check all driveshaft bolts and most importantly that main diff bolt is very tight (like 3' breaker bar tight).
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![Old](/forums/images/statusicon/post_old.gif)
06-07-2016, 11:51 AM
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![Grey 65's Avatar](http://www.clubcobra.com/forums/image.php?u=68937&dateline=1462490875) |
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Quote:
Originally Posted by Cashburn
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.....
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![Old](/forums/images/statusicon/post_old.gif)
06-07-2016, 02:52 PM
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Cobra Make, Engine: B and B Car 2 BDR
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Quote:
Originally Posted by Kobura
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.
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06-07-2016, 03:05 PM
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![Old](/forums/images/statusicon/post_old.gif)
06-07-2016, 04:27 PM
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Quote:
Originally Posted by spdbrake
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That is a good point, is this an engine tuning/camshaft trait or driveline issue?
Gary
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06-07-2016, 04:31 PM
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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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06-07-2016, 05:43 PM
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Don't worry just drive it...
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06-08-2016, 10:22 AM
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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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06-08-2016, 12:28 PM
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Quote:
Originally Posted by Kobura
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....
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06-08-2016, 02:18 PM
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Average Guy
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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.
__________________
When I said I wanted to be somebody, I probably should have been more specific...
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06-08-2016, 04:59 PM
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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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