Bill,
When I started my rebuild the machinist suggested strongly that I avoid the
high volume oil pump unless I was racing the car. (I'm not.) I can see the
possibility of the oil pressure blowing out the rear seal, but I have to say
I don't KNOW that. If it were me I think I'd drop the pan and replace the
oil pump with a stock pump and see what happens. Maybe it'll help (or maybe
not); it's sure easier than pulling the engine.
NAPA should have a good oil stock pump at a "reasonable" price.
Tom
' 67 Tiger 289.
On Tue, Jun 29, 2010 at 1:31 PM, Bill Waite <fordlandia@sbcglobal.net>wrote:
> 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.
>
> However, one concern I have is with the oil pressure. When I got the
> engine,
> I installed a Melling M-68HV high volume oil pump. The pressure has always
> been on the "high" side (at least I think it is high). At idle or higher
> RPM's, it stays at a more or less constant 60 to 65 lbs.
>
> Is it possible that the leak is possibly a result of running more pressure
> than I really need? The PCV and breather are fine, so I don't think it is
> a
> crankcase pressure issue.
>
> Guess what I need advice on is whether I should change the oil pump to a
> standard volume street type to run at a somewhat lower pressure? If so...
> any
> recommendations on the oil pump brand & model number?
>
> Also: any suggestions regarding a specific type or brand of rear main seal?
>
> Thanks in advance.
>
> Bill Waite
> Grand Rapids, MI
> B382100437
>
>
>
>
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