High oil pressure after rebuild.

[goatboy0067]

Just rebuilt early 80s 350. Motor was out of a boat so I wasn't quite sure where to post this. I primed the engine. When started for the first time the gauge jumped to 75 psi at 1000 rpm. Is this to high? Is there a way to drop the pressure besides the pump? There is no bypass installed.

[Jsdirt]

In my opinion, that is normal on a cold, fresh, low-mile engine. I've seen 80 psi many times running 20w-50 in the fall.

 

Only way to really know what the pressure actually is, is to remove the sending unit, and hook up a good, mechanic-quality pressure gauge.

[goatboy0067]

Mech gauge is what I'm using. I just want to fix the issue now (if it is in fact an issue) as it is on the run stand and much easier to remedy. Also I have not broken it in yet. Just fired it up it only ran 10 seconds tops then shut it down to check for leaks and problems.

[goatboy0067]

I am using a mechanical gauge. Fresh build not even broke in yet. Started for 10 sec. Then shut it down to check for leaks and problems. This is the only thing I saw that caused some concern. This is my first complete rebuild.

[Jsdirt]

Ahh, 10-4.

 

I still think you'll be fine. Pressure is the result of clearances in the engine - better too much (pressure) than too little. I think as it breaks in, the pressure is going to come down a bit.

[Daryl LBZ]

Probably be fine. My 88 Sierra had the gauge maxed out after it's rebuild and it ran fine with no issues.

[sdeeter19555]

The main thing would be to verify oil is getting through the entire engine...long story, but I saw an engine built with the main bearings installed upside down and that engine had high oil pressure and burnt up after about an hour of run time.

 

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