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The BMW Range
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Pointers pls on a contemplated 2002 e46 m3 purchase
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<blockquote data-quote="maxxsp" data-source="post: 646204" data-attributes="member: 4808"><p>I replaced the 2 bushes on the diff cover 1 on the front of the diff and that cured most of my clunking. Under load the diff twists which is what causes the thump/clunk if the diff mounts are shot because the diff mounts have play in them. My car did/does not have any vibration issues.</p><p></p><p>This video highlights the clunking issue due to shot bushings.</p><p>[video=youtube;Zo4sU6gUWV0]http://www.youtube.com/watch?v=Zo4sU6gUWV0[/video]</p><p></p><p>Replacing the crown ring and pinion will do nothing because the play is in the LSD unit itself which BMW has stated IS an issue on the E46 M3. The clunking sound in my car is still present from 1st-2nd gear shifts at low speed <span style="color: #FF0000">as highlighted in the BMW Service Bulletin</span>. Also, my car is a 6-speed manual, not SMG.</p><p></p><p>You say that it is driveshaft play that causes the clunking, yet after changing every part, the clunking is still present in your car. So wouldn't that point to an issue with the differential?</p><p></p><p>Here are some links to other forums highlighting the issue.</p><p><a href="http://www.m3forum.net/m3forum/showthread.php?t=386037" target="_blank">http://www.m3forum.net/m3forum/showthread.php?t=386037</a></p><p><a href="http://www.m3forum.net/m3forum/showthread.php?t=42352" target="_blank">http://www.m3forum.net/m3forum/showthread.php?t=42352</a></p><p><a href="http://forums.bimmerforums.com/forum/showthread.php?t=1819944" target="_blank">http://forums.bimmerforums.com/forum/showthread.php?t=1819944</a></p></blockquote><p></p>
[QUOTE="maxxsp, post: 646204, member: 4808"] I replaced the 2 bushes on the diff cover 1 on the front of the diff and that cured most of my clunking. Under load the diff twists which is what causes the thump/clunk if the diff mounts are shot because the diff mounts have play in them. My car did/does not have any vibration issues. This video highlights the clunking issue due to shot bushings. [video=youtube;Zo4sU6gUWV0]http://www.youtube.com/watch?v=Zo4sU6gUWV0[/video] Replacing the crown ring and pinion will do nothing because the play is in the LSD unit itself which BMW has stated IS an issue on the E46 M3. The clunking sound in my car is still present from 1st-2nd gear shifts at low speed [COLOR="#FF0000"]as highlighted in the BMW Service Bulletin[/COLOR]. Also, my car is a 6-speed manual, not SMG. You say that it is driveshaft play that causes the clunking, yet after changing every part, the clunking is still present in your car. So wouldn't that point to an issue with the differential? Here are some links to other forums highlighting the issue. [url]http://www.m3forum.net/m3forum/showthread.php?t=386037[/url] [url]http://www.m3forum.net/m3forum/showthread.php?t=42352[/url] [url]http://forums.bimmerforums.com/forum/showthread.php?t=1819944[/url] [/QUOTE]
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