Dennis Perkins wrote:
Marshall,
While looking through the 126 engine manual there was an exploded view of
the chain along with various tensioning and slide rails and a chain
tensioner. When changing the chain is there any of these other parts a
person should consider changing or is the amount of work entailed not worth
it.
If the chain stretch exceeds about 5 degrees for an OM61x engine or 4
degrees for an OM60x engine, it's desirable to change the chain. No
advantage to changing it early unless the engine is apart anyway. Chains
rarely break until "stretch" approaches 10 degrees. The chain guides
(and oil pump chain) rarely need to be changed until the engine is
completely rebuilt as they simply don't wear much unless the chain or
chain tensioner actually fail (or you have allowed the chain to go
considerably past 5 degrees before changing it). At the very least the
tensioner spring should be changed (I always simply put in a complete
new tensioner). Changing rails is a LOT more work. Putting on a new oil
pump chain is even MORE work. Neither were expected to be changed until
the engine was completely rebuilt.
Marshall
--
Marshall Booth (who doesn't respond to unsigned questions)
"der Dieseling Doktor" [EMAIL PROTECTED]
'87 300TD 182Kmi, '84 190D 2.2 229Kmi, '85 190D 2.0 161Kmi, '87 190D 2.5
turbo 237kmi
