Oil in the gauge oil line?

[casper50]

I had to change the rubber hose part of the oil line to the pressure gauge.  None of the line had oil in it.  I've been getting funny reading on the gauge as well.  Should I unhook the line at the gauge, put a hose on the line and run it out of the car, and then start it to get oil into the line?

[Don Coatney]

4 minutes ago, casper50 said:

I had to change the rubber hose part of the oil line to the pressure gauge.  None of the line had oil in it.  I've been getting funny reading on the gauge as well.  Should I unhook the line at the gauge, put a hose on the line and run it out of the car, and then start it to get oil into the line?

 

What is a "funny" reading? Normal to have an air pocket in the oil pressure line. It acts as a buffer as air is compressible but oil is not. Without the buffer the gauge would bounce all over the place.

[Adam H P15 D30]

Temporarily  attach a different oil gauge to the engine and check to see if you have the same funny readings.

[casper50]

I'm getting 60lbs at cold start up with 30wt.  Once it warms up I have 20 when driving at 55mph and 0 at 30 and below.  Engine has only 5 or 6 hours on it.

[garbagestate 44]

pressure is pressure whether it's driven by an air pocket or oil.

[Adam H P15 D30]

Is that with a known reliable gauge?  If so, Send it back to the builder. That sounds like excessive bearing clearances. 

[Don Coatney]

48 minutes ago, garbagestate 44 said:

pressure is pressure whether it's driven by an air pocket or oil.

 

I agree. But with an air buffer the pressure will be a bit more stable and not bounce around with every stroke of the pump. 

[DJ194950]

Don,

 

Stroke on a gear type oil pump?

 

Fuel pump yes, but?

 

DJ

[Don Coatney]

18 minutes ago, DJ194950 said:

Don,

 

Stroke on a gear type oil pump?

 

Fuel pump yes, but?

 

DJ

 

 

You are correct. I should have said every pulse of the oil pressure relief valve.

[DJ194950]

Can say I am not sure of a pulsating relief valve either, doubt it, but I am not that up on the valve some how  doing that.

 

Time for me to drop this I think. I am not a hydraulics engineer!  ??

 

DJ

[kencombs]

16 hours ago, Adam H P15 D30 said:

Is that with a known reliable gauge?  If so, Send it back to the builder. That sounds like excessive bearing clearances. 

If the gauge is verified with a known good gauge, then the only  things that come to mind are the bearing clearances mentioned above, oil pressure relief permanently relieving, weak pump or a leak in the transfer pipe.