The new style vacuum pumps have been reported to be reliable for more =
than 200kmi. Because there is seldom ANY warning of vacuum pump failure, =
mechanics that have worked on engines that have failed from pump failure =
usually suggest changing pumps at least every 200kmi. The pump used on =
the OM606 is the same design as was used on earlier OM60x engines =
although there have been several revisions (each intended to increase =
reliability) since that style was introduced in model year 1984.
When a 7.20607 series pump fails, the loose parts usually drops down =
into the chain vault and then into the sump. Occasionally they catch in =
the chain and this can destroy the engine. If the cam surface of the =
timer assembly is damaged, the entire timer must be replaced. Rarely the =
front shaft of the injection pump is damaged. If this occurs, the =
injection pump must be replaced. Following pump failure, the pump should =
be inspected and if there is indication of disintegration, all pump =
pieces should be removed from the sump. I know of several engines that =
have failed when pieces of a failed vacuum pump were ingested by and =
jammed the oil pump. The engine was destroyed in each of those cases.
I've attached the Pierburg installation instructions.
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
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