is my diff cooked?

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is my diff cooked?
Topic Started: Wed Sep 30, 2009 7:37 am (322 Views)
Uk Merc Man	Wed Sep 30, 2009 7:37 am Post #1
190e Leg-End, 'V' Hater, Man Lover Posts: 824 Group: Members Member #69 Joined: November 20, 2005	after racking up a few miles in the 16v over the past few weeks i noticed the back end didnt seem to be acting the way i was used to..... in the wet, its fine, you put the power down and the back tries to overtake - cool. in the dry, you snap the clutch up and it only seems to spin 1 wheel. this was further confirmed when I tried to reverse the drivers side rear up a small ramp on my drive to adjust the sls - the passengers side wheel was spinning and the drivers side wheel wasnt turning. then i went to the local car park and tried to lay down some stripes and i only gont 1..... what does this mean? is my diff knackered? its a 2.5 16v with the ASD LSD diff.....there is no whining or noise and the diff body is clean and dry.... any help appreciated.



alogaparaloga	Wed Sep 30, 2009 11:21 am Post #2
crazy mind Posts: 606 Group: Members Member #2,419 Joined: March 14, 2008	It sounds like the friction discs developed some wear and it's not giving that 30% lock anymore. It still give some as it locks on the wet though.



Martrider	Thu Oct 1, 2009 1:05 pm Post #3
Longest build time in history? Posts: 1,531 Group: Members Member #2 Joined: November 2, 2005	Sounds about right. Is ours still actually being driven by the SLS pump though? I know you took off the spheres as you said in another thread, could it be that that leak is enough to loose just a small amount of pressure, enough to not engage the friction plates?



marcus.hopkins	Thu Oct 1, 2009 7:36 pm Post #4
Administrator Posts: 2,362 Group: Admin Member #76 Joined: November 23, 2005	If there is a problem i have a spare diif you can have steve. I bought it from ashley as a spare when he removed it from his car. Mart does have a good point though. Edited by marcus.hopkins, Thu Oct 1, 2009 7:37 pm.



Uk Merc Man	Mon Oct 5, 2009 11:52 am Post #5
190e Leg-End, 'V' Hater, Man Lover Posts: 824 Group: Members Member #69 Joined: November 20, 2005	MY understanding of the diff was that the hydraulic connections are for the ASD function � which, could, I guess, be affected by pressure drop. However, the problem was there from day 1 it isn�t this. I thought the limited slip function was mechanical�.via clutch-packs on the early cars and something else on the later ones Funnily enough � if you compare mine and Marcus� donuts in this video � you�ll see my car pivots a�la proper donut with both wheels spinning, where as Marcus seems to have 1 wheel spinning and merely be driving round in a circle quickly!! The problem may have been there for some time � did you not ever try and lay down some fat number 11�s Marcus? � shame on you!! video: http://www.markthomastrimming.com/storage/merc/mercburnouts.wmv looks like drivers side wheel is doing all the work....thats what i have now? Edited by Uk Merc Man, Mon Oct 5, 2009 11:53 am.



Big Ben	Mon Oct 5, 2009 12:05 pm Post #6
Member Posts: 4,905 Group: Members Member #155 Joined: January 26, 2006	That looks very much like the LSD is not working! Could be pressure springs or friction plates or even (horror) someone has put an additive in the diff at some time in its life!



cossie connoisseur	Mon Oct 5, 2009 12:18 pm Post #7
fat tits Posts: 9,671 Group: Members Member #110 Joined: December 18, 2005	ASD. ONLY ON WAY TO REALLY FIND OUT WHAT IT IS. soz caps



Uk Merc Man	Mon Oct 5, 2009 12:38 pm Post #8
190e Leg-End, 'V' Hater, Man Lover Posts: 824 Group: Members Member #69 Joined: November 20, 2005	cossie connoisseur Mon Oct 5, 2009 12:18 pm ASD. ONLY ON WAY TO REALLY FIND OUT WHAT IT IS. soz caps caps aside....wtf? the only way to find out what it is - is what? pressure springs or friction plates - thanks Ben, that sounds mechanical and I guess the sort of thing that could wear out after 155,555 miles! thanks all. another thing for the list by the looks of it.....



RobertE	Mon Oct 5, 2009 12:51 pm Post #9
Serial victim... Posts: 6,874 Group: Members Member #1,403 Joined: June 13, 2007	Does the triangle light up when you put it under load? Roundabout exit, for example....



Uk Merc Man	Mon Oct 5, 2009 1:57 pm Post #10
190e Leg-End, 'V' Hater, Man Lover Posts: 824 Group: Members Member #69 Joined: November 20, 2005	RobertE Mon Oct 5, 2009 12:51 pm Does the triangle light up when you put it under load? Roundabout exit, for example.... yep. especially today. in the rain



cossie connoisseur	Mon Oct 5, 2009 2:00 pm Post #11
fat tits Posts: 9,671 Group: Members Member #110 Joined: December 18, 2005	only real way is to bite the bullit and have it taken apart. if the car is driving ok then just leave it till funds are there.



Uk Merc Man	Mon Oct 5, 2009 2:36 pm Post #12
190e Leg-End, 'V' Hater, Man Lover Posts: 824 Group: Members Member #69 Joined: November 20, 2005	cossie connoisseur Mon Oct 5, 2009 2:00 pm only real way is to bite the bullit and have it taken apart. if the car is driving ok then just leave it till funds are there. i guess thats subjective - the car drives ok insofar as I can drive it.....but surely a 16v without a working LSD is just an old german car with a rubbish idle? i didnt think i could drive well enough to notice, but its certainlt becoming clear that its not right, the car just doesnt handle like my previous 16v's...



cossie connoisseur	Mon Oct 5, 2009 3:33 pm Post #13
fat tits Posts: 9,671 Group: Members Member #110 Joined: December 18, 2005	drive it like a granny!!!! whoop whoop



Uk Merc Man	Mon Oct 5, 2009 9:55 pm Post #14
190e Leg-End, 'V' Hater, Man Lover Posts: 824 Group: Members Member #69 Joined: November 20, 2005	never!!!



stwat	Mon Oct 5, 2009 10:28 pm Post #15
Moderator Posts: 12,411 Group: Moderator Member #28 Joined: November 11, 2005	I thought the ASD was more of a viscous type diff with the fluid giving more pressure on the plates which in turn gives more lock up, the more traction is lost? Am i totally wrong in that assumption?



alogaparaloga	Tue Oct 6, 2009 7:08 am Post #16
crazy mind Posts: 606 Group: Members Member #2,419 Joined: March 14, 2008	what you describe is a viscous diff, but is for central diffs on constant 4 wheel drive cars, like those of the VAG group i.e. syncro. and those diffs can be fully locked by activating a pump to increase the oil pressure on the plates. LSD with clutch packs are working based on the torque ratio between output shafts. They are mechanically preloaded by the clutches in order to brake the spinning wheel until the non spinning one starts to rotate. Then for additional lock up you have the ASD or any other system that will add up more braking between the output shafts of the diff.



Uk Merc Man	Tue Oct 6, 2009 9:11 am Post #17
190e Leg-End, 'V' Hater, Man Lover Posts: 824 Group: Members Member #69 Joined: November 20, 2005	alogaparaloga Tue Oct 6, 2009 7:08 am LSD with clutch packs are working based on the torque ratio between output shafts. They are mechanically preloaded by the clutches in order to brake the spinning wheel until the non spinning one starts to rotate. Then for additional lock up you have the ASD or any other system that will add up more braking between the output shafts of the diff. thats pretty much what I expected - so to answer my own question - it would appear that my diff is cooked



Marv	Tue Oct 6, 2009 2:51 pm Post #18
Evo II Wheel Posts: 2,669 Group: Members Member #642 Joined: November 3, 2006	If your ASD's not locking then its usually needs the plates replacing.



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