When you have stuff apart so you can replace the seal, have a really close
look at the crank surface that the seal is riding against. If there is a
discernible groove in the crank where the seal lip has been riding on it, then
you will likely have problems with any replacement seal unless you get that
groove polished out (or, worst case, chromed and ground).
The only thing that will blow out seals is cylinder blowby pressure, if it's
not adequately vented by the PCV system (or a road draft tube, if you're a
Neanderthal ;) ) . An internal oil pump does not contribute to crankcase
pressure regardless of its pressure or volume capability.
Cheers,
Theo
> -----Original Message-----
> From: tigers-bounces@autox.team.net [mailto:tigers-
> bounces@autox.team.net] On Behalf Of Bill Waite
> Sent: June 29, 2010 11:31 AM
> To: tigers@autox.team.net
> Subject: [Tigers] Oil Pressure & Rear Main Leak Question
>
> For a number of years (ever since day one with a newly rebuilt 302
> roller cam
> motor), I've lived with a rear main oil leak. Not bad enough to demand
> fixing... but bothersome. I've finally decided to fix it.
>
> It's an '86 "RHO" (an early Ford crate engine... remanufactured 302
> HO). It
> has the one piece rear main seal, so I'll have to pull the trans to get
> at
> it.
>
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