Chain Tensioner Replacement - Mercedes-Benz Forum
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post #1 of 27 (permalink) Old 07-06-2019, 01:12 PM Thread Starter
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Chain Tensioner Replacement

I sometimes get a "phwap phwap phwap" noise at start up. Very rarely. It definitely isn't a "jingle" and it goes away when oil pressure comes up.

I believe this is a symptom of a tired chain tensioner.

I'm really not in the mood right now for a complete chain, guide, etc replacement. However, looking at the tensioner it looks like it is held in by 3 allen bolts. I know the chain, guides, and everything else were done back in 2006 or 15k miles ago. Yes I know, age is worse than miles.

In the interim, i'd like to buy more time before joining the chain gang.

Is my understanding of R&Ring this part as easy as:

1. Remove 3 bolts
2. Pull out tensioner and gasket
3. Put new gasket and tensioner in
4. Torque down

Mission accomplished.


I find it hard to believe it is that easy. Am I missing something?
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post #2 of 27 (permalink) Old 07-06-2019, 01:53 PM
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I think I read somewhere that its difficult to reattach the Chain Tensioner using the same bolts. If I recall correctly, you need to find a longer bolt to temporarily get it tight enough to the block for the other bolts to go in.
Not 100% sure though. Maybe someone else will chime in.
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post #3 of 27 (permalink) Old 07-06-2019, 01:57 PM Thread Starter
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Originally Posted by cwmoser View Post
I think I read somewhere that its difficult to reattach the Chain Tensioner using the same bolts. If I recall correctly, you need to find a longer bolt to temporarily get it tight enough to the block for the other bolts to go in.
Not 100% sure though. Maybe someone else will chime in.
No you're right, I just found that thread:

https://www.benzworld.org/forums/r-c...ml#post9096729

Makes sense. I can pick those two little M8 bolts up mighty quick.
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post #4 of 27 (permalink) Old 07-06-2019, 04:08 PM
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It's easy. The longer bolts s/be only loosely tightened with the nuts and then replaced by the original sized bolts.
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post #5 of 27 (permalink) Old 07-07-2019, 02:48 AM
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Beast... you have an '84 380sl, I have an '83. My tensioner doesn't have 3 bolts it has 2 and they are not Allen's they're regular bolts and no, I didn't need to use longer bolts first... the original bolts went right in. 10 minute job at worst.
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post #6 of 27 (permalink) Old 07-07-2019, 07:42 AM
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Here's another pic of the installation I found years ago...
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post #7 of 27 (permalink) Old 07-07-2019, 10:26 AM
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Originally Posted by Jyuma View Post
Beast... you have an '84 380sl, I have an '83. My tensioner doesn't have 3 bolts it has 2 and they are not Allen's they're regular bolts and no, I didn't need to use longer bolts first... the original bolts went right in. 10 minute job at worst.
Hmmm. Aftermarket or OEM tensioner? All the alloy block 107 V/8s used the same tensioner.
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post #8 of 27 (permalink) Old 07-07-2019, 11:18 AM
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Originally Posted by rowdie View Post
Hmmm. Aftermarket or OEM tensioner? All the alloy block 107 V/8s used the same tensioner.
I've seen 3 bolt tensioners but mine definitely has only 2.

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post #9 of 27 (permalink) Old 07-07-2019, 12:05 PM
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Originally Posted by Jyuma View Post
I've seen 3 bolt tensioners but mine definitely has only 2.
Yes. Yours is an alloy block. Maybe I should have said all alloy block 107s use the same two bolt tensioner. The three bolt ones are for the iron blocks with AIR pump connection.
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post #10 of 27 (permalink) Old 07-08-2019, 08:37 AM
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Its normal for a chain tensioner to loose tension overnight. Its not normal to hear a rapping noise at start up. The rapping noise at start up after 24 hr rest is caused by worn chain tension guide, worn chain or worn sprockets. You can replace the tensioner if it makes you feel good. But I don't recall replacing one in my lifetime.
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