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Old 07-22-2007, 10:38 AM
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oil pump I know I know

Does an oil pump just stop working or get bad? I have a 1971 350 and the psi drops at 3000. It has a stock pump and pan 4qt I have 4.5 to 5 qt in it (more oil helps but don't wont to over do it). At idle I have 18-20 30-35 at 3000. When I get on it it drops to 20. The motor does 6200 (trickflow topend). Is oil trapped in the top or on the crank. I have replaced the gauge with auto meter in a T fitting. I was not running a gauge for a while so I don't know if it has always been like this. It seamed to have start after I changed the break-in oil shell rotell 15/40 (did not run high rpm)went to synthetic 10/30 now I have 20/50 Lucius. I have used Fram, k&N and now napa filter with no change. I really don't wont to drop the pan my steering is in the way (55 chevy).

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Old 07-22-2007, 11:48 AM
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Sounds like wind-age. Do you have a wind-age tray?? If the oil is getting whipped by the crank it will aerate and pressure will drop. Brian
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Old 07-22-2007, 01:36 PM
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It almost sounds like the oil pump pickup isn`t in the pump as well as it should be, resulting in it sucking air. I`ve had one that did this a long time ago, and it had the same symptoms. First I would get a gauge with a direct mechanical connection to the rear oil gally beside the distributor and check it like that and see what it says. But also, there was one case where a used to be friend did a rebuild on another friends car, sometimes the car would read it had no oil pressure, other times it read erratic, They went in and changed the pump and the problem persisted. Next we removed the sending unit, and found trash had collected there, we cleaned the sending unit with carb cleaner, cleaned the passage, and did a oil change, problem solved. If you check the pressure direct and it still does the same thing, Then I think next will be to pull the pan to find out what`s wrong.
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Old 07-22-2007, 04:02 PM
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not the pickup

I think you might be on with the pick-up but I can't get the pan off without removing the steering bar the connects the wheels. I don't have a tray. On startup I can run it to 55psi at 6000 but the hotter it gets the worse it gets. just odd it is 18-20 at idle and always drops at 3000.
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Old 07-22-2007, 04:07 PM
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If it is the pickup then you`ll have to bite the bullet and find a way, as in time, it`ll get worse, when the pump swallows air, and the bearings get air, it won`t be a long time before the bearing overheats and lets loose, or simply wears so far the oil pressure will fall off even more. Best advice is to go in and see what`s wrong before it self destructs.
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Old 07-22-2007, 04:39 PM
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Quote:
Originally Posted by DoubleVision
If it is the pickup then you`ll have to bite the bullet and find a way, as in time, it`ll get worse, when the pump swallows air, and the bearings get air, it won`t be a long time before the bearing overheats and lets loose, or simply wears so far the oil pressure will fall off even more. Best advice is to go in and see what`s wrong before it self destructs.
Good advice.
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Old 07-22-2007, 05:59 PM
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Another possibility with the pick up is it could be loose. My brother in law was a GM tech and drag racer for years, he always told me and I saw him do it on several of his builds, spot weld the tube to the pump and either JB weld around where the tube pushes into the pump or he would use Ultra black silicone. He of course would let it cure before installation. I asked him about it breaking off and getting in the pump. He said he'd never had a problem with it, but he had always made sure it was degreased before putting it on and made sure it was totally cured. He'd had them suck air and had one fall off cost was high especially at 6500rpm mid track. Brian
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Old 07-23-2007, 01:10 AM
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Next time your oil pan's empty, whack the bottom of it with your fist and see if you can hear the pickup rattling on the bottom. Mine does, and it has the same symptoms as yours.
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