No oil pressure - Chevelle Tech
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post #1 of 39 (permalink) Old Jul 3rd, 20, 8:57 PM Thread Starter
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No oil pressure

Hello Team, This has got me really baffled. I finally got my 396 running. It's been out twice over the past few days for test and tune. I started it up this evening and after a couple of minutes in the garage and backing up in the driveway, I noticed there was no oil pressure. This is a mechanical gauge and it's not leaking anywhere. The oil is fresh and full. Can a mechanical gauge just stop working, or am I about to yank the engine again?

Steve
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post #2 of 39 (permalink) Old Jul 3rd, 20, 9:31 PM
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Re: No oil pressure

Had that happen once on my 375hp 396. Mine was a bad Autometer gauge something got stuck in it so I just replaced it. Worked fine after that.
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post #3 of 39 (permalink) Old Jul 3rd, 20, 9:36 PM
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I recently had the same thing happen. A small sliver of rtv got into the oil pressure sending unit blocking it.
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post #4 of 39 (permalink) Old Jul 3rd, 20, 10:09 PM
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Re: No oil pressure

As the others said, verify with another gauge. Another issue could be your oil pump pickup fell off.

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post #5 of 39 (permalink) Old Jul 3rd, 20, 11:32 PM
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Re: No oil pressure

Is the P/U tube welded on? For me the spot welds are a " Gimmie ".
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post #6 of 39 (permalink) Old Jul 4th, 20, 8:27 AM Thread Starter
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Thanks for the replies. Yes, the pickup tube was welded on. I guess I'll buy another gauge and cross my fingers. I really don't feel like pulling my engine again. All my gauges are from Autometer.

Steve
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post #7 of 39 (permalink) Old Jul 4th, 20, 9:48 AM
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Re: No oil pressure

Before you buy a new gauge, can you unhook it at the gauge, nd get a small can, and hold the line in it, then try to start it and see if oil comes out.
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post #8 of 39 (permalink) Old Jul 4th, 20, 10:19 AM Thread Starter
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Quote:
Originally Posted by Harv 442 View Post
Before you buy a new gauge, can you unhook it at the gauge, nd get a small can, and hold the line in it, then try to start it and see if oil comes out.
you know, I thought of that this morning. That's a great idea. I was kind of worried about how much and how fast the oil would be coming out of that line, but if I secured it into a 2 liter bottle, it should be ok for a second or two. Thanks for the idea. I'll let you all know how this turns out.

Steve
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post #9 of 39 (permalink) Old Jul 4th, 20, 10:49 AM
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Re: No oil pressure

Quote:
Originally Posted by Harv 442 View Post
Before you buy a new gauge, can you unhook it at the gauge, nd get a small can, and hold the line in it, then try to start it and see if oil comes out.
Do this with the plugs pulled so it spins fast with the starter-and it won't start.

Spinning a fresh engine with the starter without plugs should get you at least 30 PSI after about five seconds.
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post #10 of 39 (permalink) Old Jul 4th, 20, 11:34 AM
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Re: No oil pressure

If you really have no oil pressure. One way to check for a pickup tube that fell off is to over fill the oil to get the oil up to the pickup hole.
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post #11 of 39 (permalink) Old Jul 4th, 20, 2:00 PM Thread Starter
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Well, I have oil pressure. I figured all I had to do was watch the oil in the plastic nylon line that goes to the gauge. If the oil moved forward and compressed toward the gauge, I'm good. I guess I'll be buying a new gauge, unless I can figure out what is wrong with it after I take it out. Thanks again for all the responses.

Steve
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post #12 of 39 (permalink) Old Jul 4th, 20, 8:04 PM
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Re: No oil pressure

What exact oil filter is in place here?
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post #13 of 39 (permalink) Old Jul 4th, 20, 8:13 PM Thread Starter
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Quote:
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What exact oil filter is in place here?
I'm running a WIX 51069.
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post #14 of 39 (permalink) Old Jul 4th, 20, 9:58 PM
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Re: No oil pressure

The guage might still be good if that line is filled with air you'll never get a good reading

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post #15 of 39 (permalink) Old Jul 4th, 20, 10:30 PM
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Re: No oil pressure

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Originally Posted by 71350SS View Post
The guage might still be good if that line is filled with air you'll never get a good reading
Pressure is pressure, doesn't matter if it's air or fluid to the gauge.

Every time you shut off the engine, oil drains back to the pan. When you start it again, air will get pushed in to the line.
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