timing chian - Mercedes-Benz Forum

 
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post #1 of 4 (permalink) Old 11-10-2005, 10:15 PM Thread Starter
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timing chian

ok,I checked my timing chain on my 72 250c and it was bang on the timing markes with the chain tight.
when i went to adjust the valvesI turn the engine with bumpimg the key I noticed some times when i stopped the chain would have some slack.If i use a wrench on the pully and turn in clockwise the chain is always tight,is this right.
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post #2 of 4 (permalink) Old 11-11-2005, 02:26 AM
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RE: timing chian

The chain is probably due for a change,it's a straight forward job,but it pays to buy a tensioner and replace that at the same time.As these cars are all around 30+ years old the tensioners are mostly worn out now.That will be why you have slack on the the upside of the chain.
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post #3 of 4 (permalink) Old 11-11-2005, 09:29 AM Thread Starter
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RE: timing chian

ok.one more thing the master link is not at the top when at top dead center its its hafeway down on the upside.
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post #4 of 4 (permalink) Old 11-16-2005, 04:16 PM
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RE: timing chian

I'm only replying to emphthasize mercmad's suggestion. The chain tensioner on my 69 200d went bad and the tension rail broke. Fortunately I was in the driveway and could hear the chain slapping so shut it down and tore it down. Chain tensioner's on these old engine's with long chains are, in my opinion, if it's older than ten years, then replace it. There's seals, pistons, springs in there that get a lot of wear over the years. Also notice that when the chain is slapping the camshaft timing is changing along with it.
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