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Old 02-05-2003, 04:09 PM
Dave Bunker's Avatar
Join Date: Aug 2002
Location: Elk Grove, CA. 95758
Posts: 90
Lower TC guides question

I am about to change the upper guides and tc chain on my 420. How important is it to change the bottom? Car is an 87 with 80k on odometer...
Dave Bunker
1987 420SEL, 180k strong Blu & Grey
2004 Road King Custom
Sacramento, CA
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Old 02-05-2003, 05:29 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
The upper rails should be replaced every 75k or five years. The lower passenger side rail is the only rail of importance in the lower timing cover and it lasts between 3-400,000 miles. The tentioning rail which is also on that side can be easily replaced without removing the front cover and is should be replaced if deeply grooved.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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