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no oil pressure


 
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bobgrimes
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PostPosted: Wed Aug 21, 2019 4:22 pm    Post subject: no oil pressure Reply to specific post Reply with quote

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,
 
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Den N Ms
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PostPosted: Wed Aug 21, 2019 4:30 pm    Post subject: Re: no oil pressure Reply to specific post Reply with quote

Bob,I would first try a known good used gauge on it,as the new one might not be correct.
 
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TheOldHokie
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Location: Myersville, MD

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PostPosted: Wed Aug 21, 2019 4:43 pm    Post subject: Re: no oil pressure Reply to specific post Reply with quote

CVPost-bobgrimes wrote:
(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
 
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bobgrimes
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PostPosted: Wed Aug 21, 2019 5:22 pm    Post subject: Re: no oil pressure Reply to specific post Reply with quote

Yes, I have taken plugs out and just turning it over. Did not want to run with no pressure.
 
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ASEguy
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PostPosted: Thu Aug 22, 2019 3:21 am    Post subject: Re: no oil pressure Reply to specific post Reply with quote

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.
 
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TheOldHokie
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PostPosted: Thu Aug 22, 2019 4:14 am    Post subject: Re: no oil pressure Reply to specific post Reply with quote

CVPost-ASEguy wrote:
(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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bobgrimes
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PostPosted: Thu Aug 22, 2019 4:43 am    Post subject: Re: no oil pressure Reply to specific post Reply with quote

Sounds like a plan. Thanks for all the help.
 
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