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Old 03-07-2004, 02:18 AM
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Major maintainence on 300SD - (timing chain)?

These may seem like stupid questions, but I am considering another 300SD and have some questions before I buy. Does this car also require the replacement of the timing chain, like the 560SEL? If so- how often is it required on this model and how difficult is it to replace? Is this a non-interference engine? If the chain was to break, would it destroy the engine? Thanks in advance.

Perhaps more questions to follow.....

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Old 03-07-2004, 03:05 AM
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C'mon .... you've been around here long enough to know that you can do a search to get that info...

However - yes, you must replace the timing chain when it's excessively stretched, no, it's nothing like the M117 where the chain slowly self-destructs. The older OM617 engines may go their lives without a chain swap if the oil's been changed aggressively enough. The OM 60x should be changed around 4 degrees of stretch, the OM617 is a bit more tolerant of stretch. On these you can either pop in a woodruff key or swap the chain. Since you have to do valve adjustments on the OM617 anyway, it's easy to keep track of the stretch.

Good luck with your diesel.
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Old 03-07-2004, 07:57 AM
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I did the valves myself last summer and checked the stretch while I was in there. Mine looked fine. My car has 300,000 miles and nowhere in all the service records is there a replacement chain mentioned.
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Old 03-07-2004, 08:04 AM
LarryBible
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Chains rarely fail on their own. As with the V8, it is the failure of an associated component that does the damage. Inspect all the rails and make sure the tensioner is in good shape. Don't even bother replacing the chain unless it is stretched or you are replacing everything else anyway.

As said earlier, these chains are NOTHING as sensitive as that in the V8.

Hope this helps,
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Old 03-07-2004, 03:18 PM
VeeDubTDI
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To answer another one of your questions, yes these are interference engines. If the tensioner or one of the guides breaks, you will need a new cylinder head.

It's about time for me to take off the valve cover and check the stretch on the SDL. It's at 270,000+ miles, and I don't think the chain has ever been replaced.

My friend's 1983 300D at 250,000 miles is at 10° of stretch... however, his oil change intervals are sporadic to say the least.

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