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Old 07-04-2007, 01:08 AM
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Timing chain question for you 190E owners with the M102 engine

My 230CE has basically the same engine as the 190E with the M102 2.3L. Lately, maybe the last few hundred miles, I hear what sounds like the timing chain rattling at rpm's higher than about 3500. I don't hear anything below that. At first I thought it was the idler pulley going out, I replaced it and I still heard the same sound, sort of like a metallic slap. Has anyone had one break with the similar sounds happening? Is it difficult to replace?

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84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012
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Old 07-04-2007, 01:59 AM
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Do you know if your chain tensioner is the older, oil pump actuated one or the newer spring loaded version? Motors that had the original pump actuated tensioners would have a a tell-tale metallic rattle at start up, which would diminish or disappear when oil pressure built up. With the spring tensioners, there was no need for oil pressure to activate the tensioner.

It could also be that the metallic "slap" . . . if not isolated to the timing chain cover area, might be signaling a stuck or sticky valve lifter.
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Old 07-04-2007, 12:44 PM
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Timing chains like their rubber cam belt counterparts should be changed at certain mileages, the M102 should be done at about 160 000 kms if not sooner. These are single row chains and the links wear (quicker if oil changes are not done regularly) and thus the chain appears to stretch. If the chain jumps a few teeth say goodbye valves, and if it should break then goodbye engine.

Not too difficult a job to replace if you have a workshop manual of sorts to follow, also some excellent articles on this forum under DIY LINKS.

Do it sooner than later!
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Old 07-04-2007, 01:08 PM
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Mine is an '84. I'm presuming it has the older style tensioner. It also has the adjustable rocker arms. It only seems to make the sound, like a rattling chain, at higher rpms. Seems quiet at idle or just starting. I'll see if it has a tensioner plunger like the diesel engines. I haven't had the need to do anything on the engine mechanically for quite some time. I guess it's about time now.
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Old 07-08-2007, 11:32 PM
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Another question. Do the valve clearances on these engines get tighter or looser over time?

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