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  #1  
Old 07-03-2001, 12:53 PM
sixto's Avatar
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Can I follow the advice for checking Diesel timing chain stretch on an M103? If so, what is the allowable strech on an M103 in crank degrees?

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Sixto
91 300SE
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  #2  
Old 07-03-2001, 10:48 PM
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If the engine has been somewhat maintained, it shouldn't need a chain. I have only replaced two in ten years of working on these engines.

I would allow for 5-8 degrees of stretch on this one, but you will not find that much.

(8 degrees is only 2.5% of crank rotation. ON a gas engine, that is nothing)

[Edited by Benzmac on 07-03-2001 at 09:53 PM]
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  #3  
Old 07-05-2001, 08:04 AM
LarryBible
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Donnie had to point out to me about a year ago that these have a ratcheting tensioner. Because of this, it is pointless to replace the chain for preventive maintenance reasons.

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  #4  
Old 07-05-2001, 12:15 PM
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Larry,

Please explain further:

1) Does ratcheting mean that the tensioner adjusts its 'soft' setting as the chain and guides wear?

2) Why does this feature make it pointless to replace the chain as a preventive measure?

3) Does the tensioner maintain cam timing? I can't see how this could work without a tensioner on the other side of the chain as well.

4) How does cam timing adjustment work on an M104?

Thanks,
Sixto
91 300SE
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  #5  
Old 07-05-2001, 05:06 PM
LarryBible
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The ratcheting tensioner engines just have a history of chain reliability.

Even if the chain wears a good bit, it will not change timing to a detrimental level. Chains are typically not changed because of their effect on timing, but because of their threat of breakage.

I expect that the ratcheting tensioner maintains a tight chain thus preventing slack at any one time. If the slack is allowed at various times a whipping efffect imposes impact loading of the chain.

Have a great day,
Larry
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