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oil pressure problem 392
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51coronet
Posted 2019-09-30 12:16 AM (#588144)
Subject: oil pressure problem 392


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looking for suggestions. 392 hemi fresh build. I have no pressure at the block near the distributor and very little volume. I have great flow and pressure at the filter before it enters the block.

Im using a spin on adapter and relocation kit. I also installed the plug that is recomended when using a spin on filter. I recently dropped the pan and rear main cap and verified I have a clear path from the hole near distributor down. So that check valve has been removed that the factory installed.

What other things can I do to verify the passages are clear?

Next I will remove the adapter that is on the block and check the entry from the oil filter. Anyone have a diagram of the oil passages for a 392?

One other thing is I don't have much oil at all in the valve train. While assembling I did verify the oil passages were lined up with the holes on the heads and did shoot air through the rocker hold downs, heads and block so in theory should have oil but how much oil should I see up here?

Another note is the plug at the cam gear where it meets the distributor gear at the front side of the engine was missing. I did recently install that hoping it would fix the problem but it did not. That was fun installing that. Are you supposed to install that from the valley? I installed it from the distributor hole with some tricky tooling.

Thanks for any ideas.
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Mopar1
Posted 2019-09-30 7:11 AM (#588159 - in reply to #588144)
Subject: Re: oil pressure problem 392



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There's not much oil in the rockers compared to modern engines. W/O the plug behind the dizzy you won't have oil pressure, or not much. With engine out there's a plug on the outside that removed to get to the other. Oil galley plug,
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58coupe
Posted 2019-09-30 12:22 PM (#588171 - in reply to #588144)
Subject: Re: oil pressure problem 392



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What oil pump are you running? Maybe the relief valve in the pump is stuck open.
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57burb
Posted 2019-09-30 3:20 PM (#588181 - in reply to #588144)
Subject: RE: oil pressure problem 392



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51coronet - 2019-09-29 11:16 PM

Im using a spin on adapter and relocation kit. I also installed the plug that is recomended when using a spin on filter.


I installed a spin on filter adapter on my 392 Hemi. There wasn't a "recommended plug" with it, and I've never heard of one. Where does that plug go? I'm suspecting it might be your problem.
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Powerflite
Posted 2019-09-30 4:31 PM (#588185 - in reply to #588144)
Subject: Re: oil pressure problem 392



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He is referring to the replacement plug for the stock oil bypass valve.



(Hemi Bypass Valve.jpg)



Attachments
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Attachments Hemi Bypass Valve.jpg (249KB - 4 downloads)
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Powerflite
Posted 2019-09-30 4:37 PM (#588186 - in reply to #588144)
Subject: Re: oil pressure problem 392



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Location: So. California
Here is an oiling diagram for you.



(Hemi-BigBlock Oil Diagrams.jpg)



Attachments
----------------
Attachments Hemi-BigBlock Oil Diagrams.jpg (207KB - 6 downloads)
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51coronet
Posted 2019-09-30 5:10 PM (#588191 - in reply to #588186)
Subject: Re: oil pressure problem 392


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Thanks Powerflight. The last post is empty though. No diagram there.

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Powerflite
Posted 2019-09-30 5:14 PM (#588192 - in reply to #588144)
Subject: Re: oil pressure problem 392



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Location: So. California
It took too long to finish submitting so I got distracted with something else.

While you have it apart, make sure you have that dowel under the main cap still in place, an make sure there isn't some part of the oil bypass valve still in the motor.

Edited by Powerflite 2019-09-30 5:17 PM
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51coronet
Posted 2019-09-30 5:18 PM (#588194 - in reply to #588181)
Subject: RE: oil pressure problem 392


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Posts: 295
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I installed a spin on filter adapter on my 392 Hemi. There wasn't a "recommended plug" with it, and I've never heard of one. Where does that plug go? I'm suspecting it might be your problem.


The plug replaces the bypass valve that way you get 100% filtered oil. If I didn't have the plug installed I wouldn't know I have low or no pressure as its a straight shot to the pump from the hole where the gauge gets pressure.

So having the plug there serves 2 purposes. Accurate pressure reading and 100% filtered oil going to the engine.
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51coronet
Posted 2019-09-30 5:27 PM (#588195 - in reply to #588144)
Subject: Re: oil pressure problem 392


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That's a nice diagram much thanks. Im using a hot heads high volume pump. The dowel is there. The bypass was removed prior to me owning the block, The previous owner also removed all the plugs so I had no idea there was a plug in front of the distributor gear until I did some reading. The block was "clean" so its something I caused or something that existed before purchasing it. What a headache pulling things apart grrr
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