PeachParts Mercedes-Benz Forum - Who has or knows someone that has experienced a timing chain breakage/failure?

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- - Who has or knows someone that has experienced a timing chain breakage/failure? (http://www.peachparts.com/shopforum/diesel-discussion/203364-who-has-knows-someone-has-experienced-timing-chain-breakage-failure.html)

My buddie's 300SD had a timing chain failure at around 300k. Shattered the valve cover.

Quote:

Originally Posted by Deemo13 (Post 3294747)

My buddie's 300SD had a timing chain failure at around 300k. Shattered the valve cover.

Was the Vacuum Pump also chewed up?

A member on another list has an oil pump chain break on a 602. First time I'd ever heard of that. Nobody ever replaces the oil pump chain.

the 93 300D OM602 has a set of bad timing gears, and there is a recall on the cars for timing chain breakage... I have an example of that failure in my yard... nasty...

Quote:

Originally Posted by Mxfrank (Post 3294912)

A member on another list has an oil pump chain break on a 602. First time I'd ever heard of that. Nobody ever replaces the oil pump chain.

My car OM603 is #2 then. It seems that oil chain breaking on an OM60x engine happens but quite rare. Now I always replace the oil chain if I take the pan off.

http://www.peachparts.com/shopforum/diesel-discussion/322170-help-engine-died-300sdl-hard-turn-hand-now.html

It is not a broken chain you should be concerned about! It is the excessive stretch! These chains can stretch enough to hop teeth on the cam sprockets. This usually happens at low revs or on immediate startup as there is little or no oil pressure feeding the tensioner. Very wise to check the stretch if your vehicle has done more than 10000klms as, as you can see it can have catastrophic consequences.
Dave.

Quote:

Originally Posted by mercar (Post 3296185)

Timing Chain Stratch happens but on the 617.952 Engines it is uncommon for them to jump the Gear Teeth.

The non-turbo Engines have more of a problem with that because the Timing Chain Tensioner does not have the Ratchet that holds the Piston from being pushed back. That means any issues with the Oil Pressure have an adverse effect on keeping the Timing Chain Tensioned.

The 6 Cylinder Mercedes Diesel Car Engines seem to have more Timing Chain and Sproket issues.

You can remove the Valve Cover and line up the Timing Marks on the Camshaft and get a rough idea of how much Chain Stretch you have.

Quote:

Originally Posted by Diesel911 (Post 3408149)

......You can remove the Valve Cover and line up the Timing Marks on the Camshaft and get a rough idea of how much Chain Stretch you have.

Of course you did not define ' rough idea'...
but the FSM says that is only to be used when building an engine..
and only to get the stuff oriented ' in the correct quadrant '......