no oil pressure

bobgrimes

Member
I am working on a 1948 ford 8n. Have no oil pressure. I took off the junction valve (correct name?) where oil comes from engine. When I turn engine over without plugs I get oil coming out the hole where junction goes. And when I put the line to gauge on I get oil coming out the end of that line. It doesn't shoot out but there is a pretty good flow. However, when I hook up to gauge I get no pressure. This is a new gauge. I blew compressed air into the gauge and it moved so I am assuming it is good. Any advice here would be appreciated. I am usually a John Deere man but bought this for my wife and am learning...Thanks,
 
(quoted from post at 20:22:15 08/21/19) I am working on a 1948 ford 8n. Have no oil pressure. I took off the junction valve (correct name?) where oil comes from engine. When I turn engine over without plugs I get oil coming out the hole where junction goes. And when I put the line to gauge on I get oil coming out the end of that line. It doesn't shoot out but there is a pretty good flow. However, when I hook up to gauge I get no pressure. This is a new gauge. I blew compressed air into the gauge and it moved so I am assuming it is good. Any advice here would be appreciated. I am usually a John Deere man but bought this for my wife and am learning...Thanks,

Are you trying to get oil pressure witph the starter turning the engine over?

TOH
 
You won't get much pressure a with slow cranking speed. Engine oil pumps are positive displacement which means whatever goes in gets pushed out. If you spin it faster you get more pressure. Since you have something coming out, I would, as suggested, install a known good mechanical pressure gauge and closely monitor it once it starts. It may take 3-4 seconds to register actual pressure but not much longer. Any knocking noise and I would shut it down immediately and begin investigation. Hope this helps.
 
(quoted from post at 07:21:14 08/22/19) You won't get much pressure a with slow cranking speed. Engine oil pumps are positive displacement which means whatever goes in gets pushed out. If you spin it faster you get more pressure. Since you have something coming out, I would, as suggested, install a known good mechanical pressure gauge and closely monitor it once it starts. It may take 3-4 seconds to register actual pressure but not much longer. Any knocking noise and I would shut it down immediately and begin investigation. Hope this helps.

My thoughts exactly.

TOH
 

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