I had unfortunate incident at a BMW dealership. Whilst sevicing My 1997
740 4.4 litre the technician accidently dropped the screw top of the
spark plug into one bore. Needless to say on start up destroyed the
head and scored the cylinder. The dealership now wants to machine the
bore and put in a metal liner.
Is this possible on a aluminium alusil engine?
I would have thought the correct thing to do would be to replace the
block or the entire engine!
Any advice would be appreciated
You have a right to demand the car be returned to the same condition as
you brought it in, plus the work you paid them to perform. Iron
sleeving one of 8 alusil bores is NOT making you whole. You need a new
or factory reman engine, or a salvage engine of equal or lower miles,
and a guarantee with whatever they install. Do not let them sleeve your
While the piston is likely peened a little, the rod is probably OK.
But the combustion chamber in the head is also suspect.
A lot depends on the miles on your engine as to what might be a fair
replacement, but I'd assume the factory engine is good for 200K miles.
If you have had that car for 9 model years it is a reasonable assumption
that you intend to keep it for several more years.
It sounds to me like they are trying to not file an insurance
claim. They carry insurance for just this sort of thing, but of course
their claim history affects their rates and future insurability.
Thanks...my thoughts exactly!...They talk about replacing the head with
a second hand one which they will check. The Car has only done 62 000
miles and all long distance so the engine was like new...very
Disappointing to say the least
I agree, that sleeving is a cheap way out and they know it. I would demand
that they replace the engine with a new engine, especially since the old
engine was taken care of from the sounds of it. If not im sure your lawyer
can make them see the light ;)
No. You can't resleeve an engine that does not have sleeves. The
Alusil or Nikasil engines are alloy blocks with a very thin coating in
the bores. Not sleeves.
They will find this was a very expensive mistake. New short block, new
head. Big bucks.
These engines are made from an aluminum alloy that has copious quantities of
a very hard material (forget which one). Anyway, a very thin layer of hard
material forms the wear surface. Go through that, and you are left with
aluminum which is a very very very poor choice for wear.
Sure you can. It was routine back when Vegas roamed the earth.
Still is a big business when you need to reclaim an otherwise good block
that might not be replaceable. It is a common, weekly operation at any
automotive machine shop.
But even then they didn't sleeve just the one bad cylinder.
Yes, you are technically correct. It can be done. I should have said,
"you *shouldn't*...". The ngine was not designed for sleeves and would
not run the same.
Besides, why settle for some bodged-up repair when the shop was
obviously fully liable for the incident?
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