Got a noisy differential on a merc 190 D 2.5,1992 on a J plate-any ideas where to get a reconditioned one,or cheap new one(silly money from merc dealer) cant find one on GSF.
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thicker oil and some fine sawdust would quieten it (only kidding)
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These are about £1k recon from the Merc dealer and you will probably pay about £400 for a third-party recon unit. If you really want a quiet diff then get one from Merc. Be suspicious of used diffs unless there is a money back guarantee that it won't whine or clunck - and get it in writing (I once got stung by one of the big Merc dismantlers with a 190 diff)
190 diffs are well known for being noisy and many were a bit noisy from new. Some get noisy if a leak goes unnoticed and the gears run dry and wear. Many reconditioners will not guarantee a rebuilt unit to be free of whine. Often then whine on the overrun when the 'trailing' faces of the teeth contact.
Before you condemn the diff check out the condition on the two big rear subframe bushes and replace if they are deteriorated (they act as noise isolation).
Using a thicker oil does not usually quieten these - use an 80W-90 GL-5.
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Thanks for your helpfull advice guys,will get my boys on da job asap.
Mechanic has told us today that if you can cope with a noisy diff,there is no reason to ever bother changing it,as it will prob last as long as de car does,without being dangerous.Is he trying to slip me a mickey?
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That's probably true. Depends on the whine though. Could be pinion bearing, in which case it could get worse and cause problems. Can you 'play' it on the throttle and is there a steady faint whine at 50-60mph? If so then its tooth contact noise and unlikely to get worse. Change the oil and keep it topped up. And check/renew those two big subframe bushes - they are not expensive.
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