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Old 09-28-2003, 08:34 PM
WillN
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M110 Tensioner issues

Dear Veterans:

I'm having some issues with my '74 280 M110 timing chain tensioner.

I'm in the process of reassembling the engine around my rebuilt short block that I got from Adsit. I'm transferring the perfectly good head/valve/camshaft assy. from the old engine. Things are going really well so far, but this is one area where I don't exactly know how something functions, so I am unsure about what to be carefull about.

The book said upon re-installation, to dismantle the assembly that makes up the tensioner, reinstall until it clicks, and so on. After removing the tensioner, I mounted the unit in a vise to allen-head the spring assy. out, but I think now that I distorted it, making it unusable. Is it supposed to move in its bore, according to oil pressure? The two radiused ridges suggest a piston-like action.
1. How does this unit function? 2. What is the practical, real-world procedure for the do-it -once -and -never -have -to -worry- about -it -again way to install the timing chain tensioner?

Thanks as always,

Will

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Old 09-28-2003, 09:18 PM
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Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,318
The M110 tensioner does not use oil pressure. It is spring-loaded with ratchet-like teeth that hold the tension as the chain stretches. You take it apart and put it back together with the teeth at the appropate point for the chain, starting at its "loosest" setting.

If you think that you compromised the unit, you should replace it. It is not very expensive.

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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