Thread: "new" 420SEL
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Old 05-28-2001, 03:32 PM
stevebfl stevebfl is offline
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
The chain is not the problem. I have seen many original chains last to 300K. The problem is that the tentioner occasionally will leak down when the engine sits. During the rattling period (about 2-3 seconds)the rails which never touch the chain are banged around.

The original rails (viewed with valve covers off) are white plastic. After 60-80k they turn amber; then brown. Once they are brown they are as brittle as glass.

Have the rails checked by a color co-ordinator (bg).
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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