MB001293

[quk@isham-research.demon.co.uk (Phil Payne)]

I think I've found the problem.

The engine is fine (all within tolerance) and can be rebuilt using only
new gaskets, seals and studs.  Perhaps lifters.  The turbo oil seals are
shot on the inlet side - no physical damage, but it needs rebuilding for
new seals.

The culprit?  The after-run cooling pump is seized - the motor runs but
the impellor doesn't turn.  I suspect that the owner has not been
observing the 40-second idle down recommendation, and this - combined
with the absence of a cooling water flow - has cooked the seals.

It adds perspective to the old argument about whether it's necessary to
idle down a water-cooled turbo.  In theory, it probably isn't - but you
can never tell from the outside whether the damn pump is working or not.

I know others have commented on this feature of the pump - this incident
is (IMO) proof positive that idling down is a Good Idea, no matter on
what engine.

Also IMO - it's worth adding a take-off-and-test check on the after-run
pump to the cam belt procedure - the coolant has to be dropped to change
the water pump, so why not pull the turbo cooling pump at the same time
and see if the impellor turns when volts are applied?

--
 Phil Payne
 Phone: 0385 302803   Fax: 01536 723021
 (The contents of this post will _NOT_ appear in the UK Newsletter.)