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The BMW Range
///M Cars
Pointers pls on a contemplated 2002 e46 m3 purchase
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<blockquote data-quote="ALBundy" data-source="post: 646209" data-attributes="member: 15"><p>Maxx,</p><p></p><p>1) If you have seen a dismantled LSD unit, there is no possibility the LSD unit will produce a clunking sound even at full lock up. There is only 2 pieces of clutch. The clunking sound is from the drive shaft head connecting to the flange. There is some free play and that's where the sound comes from. If one understands how a LSD works, then there is no possibility of any clunking noise emitting from the LSD. The only noise from the LSD is a grinding noise when the car is cold and during cornering. This happens to some M owners, and some got it sorted after replacing the LSD oil. The LSD only locks up when there is a difference of traction between the rear wheels. The clunking noise only happens when upshifting, on a straight line at moderate speed (which means the LSD is not locked up). That pretty much rules out the LSD as the culprit.</p><p></p><p>2) I changed the crown and pinion gears for two reasons, 1) more usable torque and 2) to check if the free play on the differential is normal. After replacing it and servicing the LSD unit, the amount of free play is similar. And hence I can deduced the sound is from the drive shaft head connecting to the differential flange. After I refurbished it, the clunking sound lessened as the amount of free play is reduced akin like a newer M3, but its still there as there is still some free play.</p><p></p><p>3) When the rear differential bushes are shot, there are 3 (including mounting bush), under acceleration there is a continuous low pitch grinding noise. The clunk only happens when up shifting, so there is nothing to do with the bushes. Similarly with the Guibo or long shaft mount center bearing. </p><p></p><p>Since both of you go to BM World, ask Taiko Wai <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> He did some of the work I mentioned above, changing rear differential gears, refurbishing drive shafts, changing bushes and the valve adjustment (downloaded the specs for him, and he didnt even know the need to re-adjust the valves every 60000km), and he is quite well versed with the clunking issue, with me being his guinea pig 3 years ago!</p><p></p><p>To those that want to reduce the amount of clunking, get the drive shaft head refurbished<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>Cheers</p></blockquote><p></p>
[QUOTE="ALBundy, post: 646209, member: 15"] Maxx, 1) If you have seen a dismantled LSD unit, there is no possibility the LSD unit will produce a clunking sound even at full lock up. There is only 2 pieces of clutch. The clunking sound is from the drive shaft head connecting to the flange. There is some free play and that's where the sound comes from. If one understands how a LSD works, then there is no possibility of any clunking noise emitting from the LSD. The only noise from the LSD is a grinding noise when the car is cold and during cornering. This happens to some M owners, and some got it sorted after replacing the LSD oil. The LSD only locks up when there is a difference of traction between the rear wheels. The clunking noise only happens when upshifting, on a straight line at moderate speed (which means the LSD is not locked up). That pretty much rules out the LSD as the culprit. 2) I changed the crown and pinion gears for two reasons, 1) more usable torque and 2) to check if the free play on the differential is normal. After replacing it and servicing the LSD unit, the amount of free play is similar. And hence I can deduced the sound is from the drive shaft head connecting to the differential flange. After I refurbished it, the clunking sound lessened as the amount of free play is reduced akin like a newer M3, but its still there as there is still some free play. 3) When the rear differential bushes are shot, there are 3 (including mounting bush), under acceleration there is a continuous low pitch grinding noise. The clunk only happens when up shifting, so there is nothing to do with the bushes. Similarly with the Guibo or long shaft mount center bearing. Since both of you go to BM World, ask Taiko Wai :) He did some of the work I mentioned above, changing rear differential gears, refurbishing drive shafts, changing bushes and the valve adjustment (downloaded the specs for him, and he didnt even know the need to re-adjust the valves every 60000km), and he is quite well versed with the clunking issue, with me being his guinea pig 3 years ago! To those that want to reduce the amount of clunking, get the drive shaft head refurbished:) Cheers [/QUOTE]
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