560SL Timing Chain Replacement Question - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 11-23-2010, 11:59 AM Thread Starter
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Date registered: Nov 2010
Vehicle: 1988 560SL
Location: New Jersey
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560SL Timing Chain Replacement Question

Hi folks... I recently purchased an 88 560 with 75,000 miles on it from a dealer. The dealer did all the standard maintenance on the car and in addition fixed some other issues (new brake pads and rotors, new electrial switch for driver's side window, new motor mounts, various new belts, and a few other items). However, they did not replace the plastic guides for the timing chain. My own mechanic recommended that I should just go ahead and replace the guides, belts, etc any way..and at the same time since certain things have to be removed to replace the timing chain guides/belts...he would also do some other work (I think it had to do with gaskets/valves). My question is....on this site, it appears that the timing chain guides/belt should be serviced at around 100K -- my car only has 75K. Should I go ahead and do it now despite the fact that things are fine -- or should I wait. Thoughts on this are much appreciated!!!! thx.
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post #2 of 3 (permalink) Old 11-23-2010, 04:29 PM
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Pulling the valve covers

will offer the opportunity to inspect the upper chain rails, tensioner, cam oilers and chain stretch, if any. Make your decision after doing that.

The dual row chain in all 560SL is very robust and seldom fails. The upper plastic chain slippers should be replaced at around 100k since heat cycling tends to embrittle them. A piece of plastic guide getting fouled between the chain and sprocket thus messing up valve timeing usually results in a very expensive repair.

While in there, replacement of the plastic cam oiler fittings is also in order since failure of one of those can result in a dry cam lobe.
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post #3 of 3 (permalink) Old 11-24-2010, 01:05 PM
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If your timing chain is slack, you will hear it rattling on a cold start. If it's OK, why interfere?
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