Paul,
What about the oil check valve in the oil filter head? The only other
thing that comes to mind is a blocked oil gallery somewhere. Can you
get oil put of the plug at the rear of the block near the coolant
petcock/plug?
Gerard
On Jun 11, 2006, at 7:04 PM, Paul Asgeirsson wrote:
> Ok all, I've got a goody puzzler here. First time experience with
> this.
>
> Just completly rebuilt a 1275 and want to run it to break in the
> cam before giving it to the customer, get it on the engine stand,
> have already filled the filter and the oil galleys by an external
> oil pump I use to prime new engines.
>
> Now crank it to get a pressure reading on the oil gauge. Get it,
> stop cranking
>
> Put the plugs in it and hook them up. Starts and runs for a few
> seconds, so I reach over to manually set the choke again. DGV
> carb. Catch a view of a huge puddle of oil on the cement. Look
> closely and only see some oil at the oil pan edge to block. Mmmmm,
> maybe the oil filter isn't tight enough. Give it a quarter turn
> and I see the gasket bulging out the top side of the filter.
>
> Put on a new filter, being aware that it takes likely several
> hundred psi or more to do that. Look at the oil pressure gauge and
> it's broken now. Put on another one. Plugs out of head to crank
> pressure and that gauge pins the top and stays there.
>
> Go buy a real gauge that goes to 200 psi. Install and crank and it
> goes on up to 180 so I stop.
>
> Things I checked:
>
> New spring and plunger
> Oil dump hole to crankcase free and clear
> Try old plunger and spring--pressure too high
> Try cranking with no plunger and spring- No pressure reading.
> Scratch head and leave it alone overnight--GOOD PLAN, I've discovered!
>
> Next day try all the combinations of springs and plungers I have.
> No change
> Back out cap plug until it's barely caught on threads. No change
> Cut progressively small amount off a used spring. No change until
> suddenly no pressure.
>
> OK, so what's the deal? Anyone ever have a problem with too high
> oil pressure at start up? If yes, what did you do to correct it?
>
> Later, Paul A
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