On Mon, 16 Nov 2009, Andrew Packard wrote:
> Hi list. Please check out two photos I posted on the Forums, under Mechanical
> Repair, called "#4 cylinder wash-out". I'm hoping to get advice through
> Forums or our traditional list format. thanks in advance.
I'm not sure I've posted on 6-pack yet and if so cannot recall my access
info, but there's two keys to this mystery:
1. down compression in cylinder 4
2. oil leaks.
My guess is a broken ring (probably the top compression ring) OR an
improperly installed ring. The latter is actually more likely as it's a
common installation problem. In some cases, even though you orient the
rings the right way, when you compress them the gaps may line up and you
get a lot of leakdown. That pressurizes the crankcase and stuff leaks
EVERYWHERE.
I've seen this several times. Both with motors I built and others' motors
that I've looked at for folks.
Seeing that you have the head off, drop the pan and pull the piston.
You're already 90% there when the head is pulled.
I'll bet the spark plug was oil fouled too.
> Andy
> CD6746L
regards,
rml
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