My 1991 560 SEC has 84000 miles. Is it age or milage that determines when to change the timing chain rails?

This car has had Mobil 1 all it`s life , runs fine, no rattle at start up.

Thanks,
John

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President Minuteman Section MBCA
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Well, a little of both. Also, climate plays into the decesion in my mind. If you live in the deep south where the engine will typically run hotter, then I would look to change the guide rails sooner. At 84,000 you Should be OK, but then again it is cheap insurance/peace of mind to change everything out.

Don't forget the oil line clips, they are known to fail w/ age as well.

Jonathan

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Blue Ridge Mercedes
Jonathan Hodgman
http://www.blueridgemb.com/
Enthusiast Service, Restoration & Tuning.
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Located in the Atlanta area
Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines.
Mercedes Repair Atlanta

Thanks Jonathan. I thought they could become brittle just from age.

John

__________________
President Minuteman Section MBCA
www.mbca.org/minuteman

Perhaps not, but SEC's are my thing..and John didn't seem to mind too much;-)

Jonathan

__________________
Blue Ridge Mercedes
Jonathan Hodgman
http://www.blueridgemb.com/
Enthusiast Service, Restoration & Tuning.
Follow Us on Facebook!
Located in the Atlanta area
Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines.
Mercedes Repair Atlanta

Jonathan,
Replaced my injectors because of leak down. Started an intermintent ship at idle right after. Have tried to adjust mixture, seemed better. Than I changed plugs and the skip came back. Runs great other than the skip. The old plugs were worn, and tanish brown, no oil soot, very clean.

Any suggestions? And oh, I didn`t mind you awnsering.

John

__________________
President Minuteman Section MBCA
www.mbca.org/minuteman

Jonathan,
Replaced my injectors because of leak down. Started an intermintent skip at idle right after. Have tried to adjust mixture, seemed better. Than I changed plugs and the skip came back. Runs great other than the skip. The old plugs were worn, and tanish brown, no oil soot, very clean.

Any suggestions? And oh, I didn`t mind you awnsering.

John

__________________
President Minuteman Section MBCA
www.mbca.org/minuteman