Check the valve guides and seals, with the valve closed,
compression will be good. But when the valve opens, if the
guide is worn or the seal is bad, oil will be sucked from
the top end.


"Robert M. Gary" wrote in message
oups.com...
|
| Jim Burns wrote:
| It seems like I'm agreeing with Jim these days, I'd also
say that something
| is creating excessive case pressure. Along those lines
I just tore down a
| horizontally opposed Kohler that was blowing oil from
the breather faster
| than I could dump it in. It had blown a cylinder barrel
seal, not a gasket,
| just an RTV seal. The key is that something caused the
seal to blow. What
| did I find? Cracked exhaust valve guide that allowed
exhaust pressures into
| the case.
|
| Would that show up in a compression test though? I"m
getting 79's all
| around in the compression test. The IA seemed impressed
with the
| compression. Also, my EGTs seem to be running about the
same.
|
| -Robert
|