blitz wrote:
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PCV is a good candidate, since it regulates pressure / vacuum.

'Curly'

blitz wrote:
I've never had a problem using OEM seals. Clean the seal bore, then apply a
thin coat of ultra gray silicone to the outer lip of the seal, and apply
silicone grease to the inner lip where it rides on the seal journal of the
cam. Also make sure that you've installed the seal retainer for the counter
balance shaft seal. It's an updated part from Honda that guarantees that
the newly installed seal won't pop back out. Without it, you might
experience the same problem once again. By the way, make sure you don't
install the cam seal too far in the bore. The face of the seal should be
flush with the inner bevel of the bore in the head.

Eric

"blitz" <@.> wrote

PCV, I'm sure. The '80s Volvos, which have an unconventional crankcase
ventilation system, often pop out the rear main seal and front cam seal when
the ventilation system plugs up. I didn't even think to clean out the 3/8
inch hoses on mine; I lost three quarts of oil in as many miles on the
freeway when they plugged up, but the seals stayed put. Whew!

Volvo guys just pry the seals back in from the side, and they stay put once
the crankcase pressure is corrected.

Mike