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401 100+ psi much oil pressure |
Post Reply | Page 123 6> |
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Rocketman
AMC Fan Joined: Aug/20/2011 Location: uniontown pa Status: Offline Points: 19 |
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Posted: Oct/18/2017 at 7:45pm |
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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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Rebel Machine
AMC Addicted Joined: Jul/03/2007 Location: Western Il Status: Offline Points: 5122 |
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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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SKeown
AMC Addicted Joined: Jul/30/2009 Location: Texas Status: Offline Points: 3085 |
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Midplate, throw that gimmick in the trash! SKeown
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mmaher94087
AMC Addicted Joined: Apr/01/2008 Location: Arizona Status: Offline Points: 1690 |
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Just as an FYI, if the bypass plunger is installed backward; the filter canister will split like a cherry bomb went off in it.
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Mike
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Rocketman
AMC Fan Joined: Aug/20/2011 Location: uniontown pa Status: Offline Points: 19 |
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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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Moffman
AMC Nut Joined: Sep/28/2011 Location: New Jersey Status: Offline Points: 287 |
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Yes |
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Rocketman
AMC Fan Joined: Aug/20/2011 Location: uniontown pa Status: Offline Points: 19 |
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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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SKeown
AMC Addicted Joined: Jul/30/2009 Location: Texas Status: Offline Points: 3085 |
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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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Red20
AMC Addicted Joined: Jan/29/2013 Location: Oceanside CA Status: Offline Points: 1556 |
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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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1969 Javelin SST "Screamin' Banana" - Totaled Feb 2018
1973 Hornet Sportabout X "yellajack" - 360/727/TracLoc DAILY DRIVER |
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SKeown
AMC Addicted Joined: Jul/30/2009 Location: Texas Status: Offline Points: 3085 |
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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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