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Outstanding Contributor , Bob's Your Uncle!
-----'83 280 SL----- 5 speed....The PIG
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29,496 Posts
Discussion Starter #1 (Edited)
There are a few obvious indicators that you might need to address the timing chain and related parts.
There are a lot of pics posted here and there. I thought it might be nice to assemble them all in one spot.

Please add to it.

Here's a typical chain routing .

The red circles on the pic are the rail pin locations. (Thanks, Rowdie)
 

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Outstanding Contributor , Bob's Your Uncle!
-----'83 280 SL----- 5 speed....The PIG
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29,496 Posts
Discussion Starter #2
Broken chain rail.
 

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Outstanding Contributor , Bob's Your Uncle!
-----'83 280 SL----- 5 speed....The PIG
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29,496 Posts
Discussion Starter #3
Wear marks from a loose chain on the head.
 

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Premium Member
1986 560SL with M120 V12 Engine, 1988 560SL Stock
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10,174 Posts
Wear marks from a loose chain on the head.
Very important rail to change is #11. Wear on this rail along with a stretched timing chain are the two biggest reasons for the head wear. This rail is often neglected and can be easily removed without removal of the timing cover. The pin is located under a plug which has to be removed to gain access to it. To pull the pin thread a tap into it until it binds and rotates than pull on the tap.
 

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Outstanding Contributor , Bob's Your Uncle!
-----'83 280 SL----- 5 speed....The PIG
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29,496 Posts
Discussion Starter #5
Worn and broken guides..........
 

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Outstanding Contributor , Bob's Your Uncle!
-----'83 280 SL----- 5 speed....The PIG
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29,496 Posts
Discussion Starter #6 (Edited)
Bad versus good tensioner............
 

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Outstanding Contributor , Bob's Your Uncle!
-----'83 280 SL----- 5 speed....The PIG
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29,496 Posts
Discussion Starter #7
Kiss of death............what happens when a chain fails..............
 

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Outstanding Contributor , Bob's Your Uncle!
-----'83 280 SL----- 5 speed....The PIG
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29,496 Posts
Discussion Starter #8
What a new slider / rail looks like....
 

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Outstanding Contributor , Bob's Your Uncle!
-----'83 280 SL----- 5 speed....The PIG
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29,496 Posts
Discussion Starter #9
A new timing chain for those square cam gears................
 

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Registered
US spec MB560SL 1986, Audi A4 and A6, Ford Taunus 1964 17M and 2.0 1975
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1,419 Posts
Chain rail pin removal tool

Home made W107 chain quide rail pin removal tool. I have found this set very helpful.
 

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Outstanding Contributor , Bob's Your Uncle!
-----'83 280 SL----- 5 speed....The PIG
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29,496 Posts
Discussion Starter #11
A new timing chain for those square cam gears................
180 views and no comment on this.

Wow.

Where am I??

SL107.com?
 

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R/C107 Moderator
1986 560SL: '84 500SL: '84 280SL 5 speed: other 107s
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32,324 Posts
I was waiting for a picture of the square sprocket.
I also have seen them used on the muffler bearing drive gear.
 

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Registered
1978 450SL (RIP); 2007 Impala 9C3 (Police); 2010 Ford Edge
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212 Posts
Here's a newbie question: It looks like you can change some of the guides with only the valves cover off. True? I'm thinking my covers are leaking and will need to change the gasket, so....

Also, great pics...
 

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Outstanding Contributor , Bob's Your Uncle!
-----'83 280 SL----- 5 speed....The PIG
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29,496 Posts
Discussion Starter #14
Here's a newbie question: It looks like you can change some of the guides with only the valves cover off.
The important ones, yes.
 

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Premium Member
'72 350SL, '85 300D, '98 E320, '19 Subaru Outback (sold '14 GLK250)
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10,329 Posts
The early 107 SLs have metal backed guides. It is generally accepted that these should be retained if at all possible, rather than install the newer all-plastic guides.

Apparently aftermarket metal backed guides are available in Germany for the M116 engines, but not for the M117.
http://www.benzworld.org/forums/attachments/w126-s-se-sec-sel-sd/341675d1289487261-re-enforced-timing-chain-guide-now-guiderail.pdf

There is another thread that indicates heavy duty plastic and metal backed guides are available for later cars. This is a link to that thread.

This pic shows a metal backed guide as well as the chainmarks on my car.
 

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Outstanding Contributor , Bob's Your Uncle!
-----'83 280 SL----- 5 speed....The PIG
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29,496 Posts
Discussion Starter #17
Good addition, WWW.

The M110 still uses metal backed guides.
 

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Outstanding Contributor , Bob's Your Uncle!
-----'83 280 SL----- 5 speed....The PIG
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29,496 Posts
Discussion Starter #20
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