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401 100+ psi much oil pressure

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Rocketman View Drop Down
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    Posted: Oct/18/2017 at 8:45pm
My 401 is installed and as i primed the pump we noticed it was pegging the oil pressure gauge, and even managed to blow out the o ring on the oil filter. Searching says its either the bypass valve sticking, too small a hole in the steel plate from bulltear, or a plug in the bypass line. All the front accessories are from bulltear. Is there anything else it could be? Also if its the bypass spring assembly can I get them at auto'reillys napa parts? I figure they have the gaskets if I gotta drop the pump cover. Thanks.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rebel Machine Quote  Post ReplyReply Direct Link To This Post Posted: Oct/18/2017 at 9:26pm
Originally posted by Rocketman Rocketman wrote:

My 401 is installed and as i primed the pump we noticed it was pegging the oil pressure gauge, and even managed to blow out the o ring on the oil filter. Searching says its either the bypass valve sticking, too small a hole in the steel plate from bulltear, or a plug in the bypass line. All the front accessories are from bulltear. Is there anything else it could be? Also if its the bypass spring assembly can I get them at auto'reillys napa parts? I figure they have the gaskets if I gotta drop the pump cover. Thanks.



I experienced the exact same thing. The bypass hole in the Bulltear midplate is too small. When the oil is cold it's thick and even with the bypass valve all the way open (I tested that by removing the overpressure valve spring) the midplate hole still doesn't allow enough flow.

Either remove the midplate or enlarge the bypass passage to the same size as that on the oil filter mount side of the pump.

-Steve-
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SKeown Quote  Post ReplyReply Direct Link To This Post Posted: Oct/18/2017 at 9:53pm

 Midplate, throw that gimmick in the trash!

 SKeown
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Post Options Post Options   Thanks (1) Thanks(1)   Quote mmaher94087 Quote  Post ReplyReply Direct Link To This Post Posted: Oct/18/2017 at 10:57pm
Just as an FYI, if the bypass plunger is installed backward; the filter canister will split like a cherry bomb went off in it.
Mike
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rocketman Quote  Post ReplyReply Direct Link To This Post Posted: Oct/19/2017 at 2:29pm
Okay, just so i can rule it out while i'm there, the plunger goes pointy side away from the spring? Thats what it looks like on diagrams i've seen. Rather ask and sound dumb than have to go at it twice.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Moffman Quote  Post ReplyReply Direct Link To This Post Posted: Oct/19/2017 at 2:42pm
Originally posted by Rocketman Rocketman wrote:

Okay, just so i can rule it out while i'm there, the plunger goes pointy side away from the spring? Thats what it looks like on diagrams i've seen. Rather ask and sound dumb than have to go at it twice.


Yes
Image result for amc oil pressure plunger
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rocketman Quote  Post ReplyReply Direct Link To This Post Posted: Oct/19/2017 at 2:55pm
10/4, 99.9 percent sure I put it that way but for all the time itll take to check no reason to not to.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SKeown Quote  Post ReplyReply Direct Link To This Post Posted: Oct/19/2017 at 3:16pm

 There's been a lot of talk about the inadequate AMC oil pump, but it's capable of blowing up the filter. A useful aftermarket component would be an adjustable bypass unit.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Red20 Quote  Post ReplyReply Direct Link To This Post Posted: Oct/19/2017 at 4:10pm
Originally posted by SKeown SKeown wrote:




 Midplate, throw that gimmick in the trash!

 SKeown


Hey! I've used Bulltear's midplate. Seemed fine to me. But yeah, a properly clearanced and true oil pump cavity and adapter with good gears and relief valve should work just fine.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SKeown Quote  Post ReplyReply Direct Link To This Post Posted: Oct/19/2017 at 8:16pm
Originally posted by Red20 Red20 wrote:

Originally posted by SKeown SKeown wrote:




 Midplate, throw that gimmick in the trash!

 SKeown


Hey! I've used Bulltear's midplate. Seemed fine to me. But yeah, a properly clearanced and true oil pump cavity and adapter with good gears and relief valve should work just fine.

 What real benefit does it provide? If you're concerned about wear on the pump cover get yourself a sheet of sand paper and eliminate it. I did mine on a formica countertop in about 10 minutes. Besides I don't like the need for a second gasket in conjunction with the unnecessary part.

 SKeown 
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