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Old 05-13-2019, 11:27 PM
Joe
 
Join Date: May 2019
Location: Connecticut
Posts: 37
230SL, 250SL, 280SL jump time? Chain stretch?

Has anyone with a Pagoda every have their car jump time due to a loose chain? My 280SL has what I believe to be an original chain which seems to be OK now (125K miles), but after all these years, I'm concerned about stretch picking up quickly...are most people putting in new chains as a precaution?
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Old 05-13-2019, 11:40 PM
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Join Date: Dec 2010
Location: Ontario
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I change them out at about 100,000 miles.
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Old 05-14-2019, 08:14 AM
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I wouldn't expect the chain to be a problem on the M130 - even though I have never worked on one - the diesel engines of that period had more chain elongation / stretch problems so much so Mercedes made off set keys to adjust the camshaft timing.

The process of measuring the elongation is commonly termed as the "2mm lift test". This in similar forms is used to assess the condition of the chain for many other engine types. I imagine it is also explained in the M130's workshop manual.
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Old 05-14-2019, 10:19 AM
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Location: Ontario
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The chain in a diesel is different than in a gasoline power engine. They both wear and at about the same rate.

I've replaced a lot of them on both engine types.
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Old 05-14-2019, 10:07 PM
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when it doubt, measure the stretch. Set the crank to TDC by hand and look at the cam timing mark.

If you're really clever, figure out which comes first the TDC mark or the cam tower mark and then figure out how much along the crank you need to go to get the other one lined up.

If there's enough stretch to do something about, you can correct the timing with an offset key under the gear or you can turn a whole new chain into place.

-CTH
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