I bet many of you knew this already but just in case anyone is tempted to do
what I did and take a new oil pump out of the box and bolt it to the engine -
STOP !.
Just over a week ago I finished the engine rebuild that I started in December.
One of the last parts I installed was a new oil pump which came from one of
the big two. Started up the engine, no oil pressure. To cut a long story
short, after a near total engine strip down we found that the oil pumped had
jammed with a TINY piece of aluminum. It got between the inner vanes and the
outer cylinder and because there is just a few thou clearance it was enough to
jam the pump solid. We had to take a BFH to separate the pump parts. On closer
examination I found that the area of the casting that had been machined to
make an oval hole to create a channel in the pump body was left very rough
with several bits of aluminum hanging on by a thread. It was one of these that
the pump apparently ate and then jammed. So the moral here is before
installing a new pump take it apart, carefully inspect it and remove any loose
material that is left over from the machining.
The collateral damage to the pump jamming is that my dizzy drive gear is
beyond repair :-( and I need a replacement. This part is NLS so if anyone has
a spare that they are willing to part with for suitable compensation I would
love to hear from you.
Stan
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