bmwcarmagazine.com Forum Index » 3-Series » From The Project: The Right Tools For The Job Goto page Previous  1, 2, 3, 4, 5, 6, 7  Next    View previous topic :: View next topic  Posted: Thu Apr 05, 2007 1:22 pm Woody Established   Joined 09 Apr 2002 Posts 10868 Location United Kingdom Wow good answer! So modifiying the ramp angle would basically cause it to lock easier. I'd imagine that on the road the standard setup would be fine then as you don't want to be driving sideways out of every junction and scrubbing your tyres on every hard bend. Interesting about the overrun lock. I'll have to admit I still have no idea how diffs work from a mechanical point of view but I understand (I think) what altering the front and rear ramp angle produces. Anyway you can have your thread back now... Posted: Thu Apr 05, 2007 1:30 pm Neil Established   Joined 22 Jan 2002 Posts 17309 Location Woking, Surrey I'm pretty happy (and indeed ecstatic in the wet!) with the LSDs locking-ness. I just want it to be quiet. _________________ blog | twitter Posted: Thu Apr 05, 2007 3:08 pm Ian332isport 3 Series Moderator   Joined 26 Feb 2003 Posts 2350 Location West Sussex If it was me, I'd pop it back on as is (with new sensor and straightened trigger wheel) and see how you get on. When I was in the back trying to diagnose the noise, I did not notice any abnormal diff noise. It's certainly not singing like a choir boy Ian. _________________ Posted: Thu Apr 05, 2007 3:20 pm Neil Established   Joined 22 Jan 2002 Posts 17309 Location Woking, Surrey Ian332isport wrote: If it was me, I'd pop it back on as is (with new sensor and straightened trigger wheel) and see how you get on. When I was in the back trying to diagnose the noise, I did not notice any abnormal diff noise. It's certainly not singing like a choir boy Excellent. Now I've got both you and Simon to blame in public and sympathise with in private, I think I'll give it a go. _________________ blog | twitter Posted: Thu Apr 05, 2007 3:22 pm Olly Section Moderator   Joined 29 Jan 2002 Posts 3708 Location Horizontal If my friday night isn't too messy, I may be around on Saturday to get in your way, should you wish. And I won't dress as smart as last time! Posted: Thu Apr 05, 2007 3:26 pm Neil Established   Joined 22 Jan 2002 Posts 17309 Location Woking, Surrey Olly wrote: If my friday night isn't too messy, I may be around on Saturday to get in your way, should you wish. And I won't dress as smart as last time! Which way in shall we put the LSD? _________________ blog | twitter Posted: Thu Apr 05, 2007 3:43 pm M3 Compact Administrator   Joined 18 Apr 2004 Posts 41051 Location Reality. Neil wrote: Ian332isport wrote: If it was me, I'd pop it back on as is (with new sensor and straightened trigger wheel) and see how you get on. When I was in the back trying to diagnose the noise, I did not notice any abnormal diff noise. It's certainly not singing like a choir boy Excellent. Now I've got both you and Simon to blame in public and sympathise with in private, I think I'll give it a go. Fancy going halves on the £2, Ian? (Either way of course. ) Just to add: Roofer's suggestion of checking the mesh with some blue makes sense, it only takes 5 mins. Byteflyte is of course correct that the proper thing to do is to strip/rebuild it. Neil's renowned reluctance to part with a £ where a Euro will suffice combined with evident hesitancy at DIYing a bearing swap, are the only reasons for my suggestion to try 'as is'. [/Public humiliation avoidance disclaimer] _________________ Posted: Thu Apr 05, 2007 3:45 pm Neil Established   Joined 22 Jan 2002 Posts 17309 Location Woking, Surrey M3 Compact wrote: Roofer's suggestion of checking the mesh with some blue makes sense, it only takes 5 mins. Can anyone explain this in English? _________________ blog | twitter Posted: Thu Apr 05, 2007 4:33 pm Ian332isport 3 Series Moderator   Joined 26 Feb 2003 Posts 2350 Location West Sussex Neil wrote: M3 Compact wrote: Roofer's suggestion of checking the mesh with some blue makes sense, it only takes 5 mins. Can anyone explain this in English? Engineers blue is a sort of dark blue dye that you paint on the teeth of the crown wheel (the big one ). Once dry, you turn the pinion so the crown wheel goes round a few full revolutions. Where the pinion teeth contact the crown wheel teeth, they will wear off the blue, and show you where the contact patch is. You really want it to be somewhere in the middle of the crown wheel teeth.... I think Ian. _________________ Posted: Thu Apr 05, 2007 4:35 pm Roofer Forum Moderator   Joined 31 Jan 2004 Posts 19711 Location Dunno. Neil wrote: M3 Compact wrote: Roofer's suggestion of checking the mesh with some blue makes sense, it only takes 5 mins. Can anyone explain this in English? You coat the CWP Teeth in 'blue, revolve it, and it identifies if the teeth are meshing correctly, if they are meshing offline, its usually a sign that some shimming or bearings are required. [Edit] What Ian said Posted: Thu Apr 05, 2007 4:41 pm Neil Established   Joined 22 Jan 2002 Posts 17309 Location Woking, Surrey That makes sense, thanks for the explanation. Standard kind of stuff that rip of merchants like Halfords stock, or will I have to look elsewhere on a Saturday morning? _________________ blog | twitter Posted: Thu Apr 05, 2007 4:50 pm Roofer Forum Moderator   Joined 31 Jan 2004 Posts 19711 Location Dunno. Neil wrote: That makes sense, thanks for the explanation. Standard kind of stuff that rip of merchants like Halfords stock, or will I have to look elsewhere on a Saturday morning? Engineering supplies....Halfords tosspots wouldn't know how to get the lid off Posted: Thu Apr 05, 2007 5:05 pm M3 Compact Administrator   Joined 18 Apr 2004 Posts 41051 Location Reality. Would it be worth trying it in both directions in this instance? (ie Once with the pinion turning the crown wheel and once with the output/crownwheel turning the pinion.) _________________ Posted: Thu Apr 05, 2007 5:06 pm Neil Established   Joined 22 Jan 2002 Posts 17309 Location Woking, Surrey Roofer wrote: Neil wrote: That makes sense, thanks for the explanation. Standard kind of stuff that rip of merchants like Halfords stock, or will I have to look elsewhere on a Saturday morning? Engineering supplies....Halfords tosspots wouldn't know how to get the lid off Sadly I don't think I'm going to be able to get any in time then - bank holiday tomorrow and all that. _________________ blog | twitter Posted: Thu Apr 05, 2007 5:34 pm Roofer Forum Moderator   Joined 31 Jan 2004 Posts 19711 Location Dunno. M3 Compact wrote: Would it be worth trying it in both directions in this instance? (ie Once with the pinion turning the crown wheel and once with the output/crownwheel turning the pinion.) No, the direction of normal rotation is what is required. Posted: Thu Apr 05, 2007 5:47 pm M3 Compact Administrator   Joined 18 Apr 2004 Posts 41051 Location Reality. Roofer wrote: M3 Compact wrote: Would it be worth trying it in both directions in this instance? (ie Once with the pinion turning the crown wheel and once with the output/crownwheel turning the pinion.) No, the direction of normal rotation is what is required. Yep, didn't mean 'in reverse'. Normal direction of rotation, turned from the pinion side and also turned from the output side. (As it seems to only be on the overrun when the problem occurs.) _________________ Posted: Thu Apr 05, 2007 11:05 pm M3 Compact Administrator   Joined 18 Apr 2004 Posts 41051 Location Reality. M3 Compact wrote: Normal direction of rotation, turned from the pinion side and also turned from the output side. (As it seems to only be on the overrun when the problem occurs.) No takers? If it's only touching on the overrun that's caused by opposing force movement, it has to be meshing differently, doesn't it? Perhaps there's enough bearing movement to knock the sensor 'prong' out of the way (break it) that's vulnerable with power on, while still touching the other (in tact) sensor 'prong' on overrun? _________________ Posted: Thu Apr 05, 2007 11:48 pm Roofer Forum Moderator   Joined 31 Jan 2004 Posts 19711 Location Dunno. The meshing movement will show up on the blue under normal rotation. It won't centre itself. you mean trying to find lash in the CWP? I think the prong got bent in a kerbing incident, but would have expected the bearing race to collapse at the same time Posted: Fri Apr 06, 2007 10:06 am M3 Compact Administrator   Joined 18 Apr 2004 Posts 41051 Location Reality. Roofer wrote: I think the prong got bent in a kerbing incident, but would have expected the bearing race to collapse at the same time This is the worrying part imo. I don't think the wheel kerbing incident caused it - too much spare in the shafts and agreed that the bearing would be smashed. The arm may have been replaced, but the wheel would've been very badly damaged by enough of a clout to load the shaft up. Why was it only touching on overrun? Can't decide whether any undesirable internal movement would be in the same direction during power on or overrun - I think it probably would, due to the gears naturally trying to separate? Was the damaged 'prong' on the outer (wheel) side of the trigger wheel in the diff, Neil? Hmm. _________________ Posted: Fri Apr 06, 2007 10:12 am Roofer Forum Moderator   Joined 31 Jan 2004 Posts 19711 Location Dunno. Quote: Why was it only touching on overrun? Thats whats strange, the CWP would need a lot of movement for that to happen? 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