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Old 09-22-2003, 01:11 PM
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Join Date: Jul 2003
Location: Tulsa
Posts: 304
timing chain - upper guide rails.. ? special tools

I'm in the process of planning to replace the upper guide rails on my V8 119 engine (92 400SE M119). After reading through the information supplied on the AllData website, I noticed the information makes reference to MB Special tools to perform the upper guide rail replacement.

Are the special tools necessary to perform the job. Are there other tools that I can use as a work around for the job.

Thanks in advance for any information.


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Old 01-25-2010, 12:25 AM
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Join Date: Aug 2001
Location: USA
Posts: 8,074
I'm not sure if you can do it without the special tool, but since the tool isn't expensive, I'd pick one up...

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Old 01-25-2010, 12:59 AM
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Join Date: May 2007
Location: Arizona
Posts: 760
I talked to the tech about the special tool. He said that the tool is used to remove the upper guides without breaking them and, most of the time, they are so brittle that they break anyway. In fact, he advised me to shove some rags under where the timing chain goes down into the engine so none of the plastic will break off as you remove the old guides. No special tools are required unless you're trying to get them off without breaking the guides. There are only 2 Allen bolts on each side that hold the guides on.
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timing chain - upper guide rails.. ? special tools-hpim0915.jpg   timing chain - upper guide rails.. ? special tools-hpim0924.jpg   timing chain - upper guide rails.. ? special tools-hpim0943.jpg  
1993 400E, 256,000 miles (totaled)
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1995 E420, 201,000 miles

Last edited by emerydc8; 01-25-2010 at 01:22 AM.
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Old 01-25-2010, 12:00 PM
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Join Date: Aug 2001
Location: USA
Posts: 8,074
Correct. If you're just replacing old guides, your method works fine. If the guides are recent and don't need replacement, but need to be removed for other service work (i.e., changing the blasted plastic oil tube at the front of the head), the tool will allow removal without damage.

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