payuppsucker

Anybody ever seen a front seal push out of the timing chain cover for no apparent reason? The whole seal, metal and all.

MILD THUNDER

iTrader: (3)

A little too much blowby?

payuppsucker

They're brand new motors, 540's. About 75 hours, breathers in both valve cover. However, on a couple of occasions each of them have pushed the dipsticks out about a half inch.

payuppsucker

Doesn't use any oil or drip from the breather.

mike tkach

iTrader: (3)

i agree with mild,to much crankcase pressure can cause that.

30ftpanther

iTrader: (1)

Long story short. Rebuilt one motor put new valve cover breathers on both, two per motor. After long hard runs old motor lost oil out of rear main seal. Pulled old motor replaced seal, oil leak not so bad now and both dipsticks are up two inches. WTF!! Took the foam out of the new breathers and that fixed my problem.Good luck and be safe.

donzi matt

iTrader: (1)

Are these motors boosted or naturally aspirated?

payuppsucker

There is hardly any blow by at the valve covers. Are you talking pressure just from the displacement of the pistons? Why the hell would it push out a driven in seal before it could pop a valve cover breather out of its grommet, which on my motors just happen to fit loosely?

payuppsucker

NA Matt.

payuppsucker

Since you mentioned this the dipsticks have only been pushed out when the breathers have a few hours on them since being rinsed with Avgas.