the dreaded timing chain tick? - Mercedes-Benz Forum

 
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post #1 of 4 (permalink) Old 03-29-2010, 12:54 AM Thread Starter
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the dreaded timing chain tick?

decided to continue driving the 115 until my 123 front end comes in (thing has camber like a race car!). went to start it the other day and as i was driving, noticed a slight tick in the motor, figured it was cold and would go away after warming up. it didn't. it's NOTICEABLY louder. def. not a rod, as it's too frequent and light. sounds like a very noisy tappet, but it's coming from what sounds to be between the tining sprocket on the cam and the water pump. timing chain's never been changed. '76 300d, 617.912, 228K. or maybe 328k. probably the latter. in an unrelated matter, my rear main seal just crapped out on me. which is simply wonderful...oh well. but anyway...

ideas? thoughts?

i'm not sure of its the chain, but unless a better prognosis comes along, is there a tensioner adjustment that can buy me some time before i can start driving the 123? i'd drive it now but i really don't feel like popping a ball joint and folding front end sheet metal on an otherwise pristine car...

'83 300DT -- 284K (rust casualty-gone in 2009)
'76 W115 300D -- spun bearing at 400K+, RIP 10/31/12
'78 300CD -- 159K - sold or crushed by ex (cringe)
'83 240D -- 162K - totalled (not by me) (parts car)
'75 240D -- 91K - clean enough to eat off the frame
'85 500SEL Euro -- 196K - why not?

'85 300DT --
03/16/10 - 243K
05/30/14 - 381K (daily driver - it won't die!)
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post #2 of 4 (permalink) Old 03-29-2010, 01:55 AM
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Or simply put in a new tensioner. The tensioner is spring-loaded and fills itself with oil. If the oil doesn't stay in, the tensioner works with just the spring, which isn't strong enough by itself, than can cause ticking.

A simple test for the timing chain is putting the camshaft exactly on its mark and checking the amount of degrees the crankshaft is off its OT (TDC) mark.
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post #3 of 4 (permalink) Old 03-29-2010, 09:51 AM
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I'll put my money of the tensioners and guide rails themselves. You can pull the valve cover and see the chain (check for looseness) and using a flashlight perhaps one or more of the tensioners/guide rails. You can also use Govert's procedure to check for chain/tensioner wear and looseness.

Last edited by mbbuff; 03-29-2010 at 09:54 AM.
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post #4 of 4 (permalink) Old 03-30-2010, 07:28 PM Thread Starter
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changed the tensioner and spring, being careful to make sure nothing jumped time a tooth. it's worse. clicking is much louder, it's hard to start hot or cold, and it smokes like a locomotive. i went to check the valves and cam, and both lobes for no. 1 are wiped. looks like it hadn't had a valve adjusment in...oh a hundred thousand miles. that's what i get for buying a benz from a redneck. he'd mud it in cornfields, and laughed when he told me about it.

any idea what a new or used 617.912 cam runs? i could probably get away with the one that's in there for a long time yet...after i open the lash up-from ZERO...

'83 300DT -- 284K (rust casualty-gone in 2009)
'76 W115 300D -- spun bearing at 400K+, RIP 10/31/12
'78 300CD -- 159K - sold or crushed by ex (cringe)
'83 240D -- 162K - totalled (not by me) (parts car)
'75 240D -- 91K - clean enough to eat off the frame
'85 500SEL Euro -- 196K - why not?

'85 300DT --
03/16/10 - 243K
05/30/14 - 381K (daily driver - it won't die!)
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