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Thread: 1966 396 low oil pressure
          
   
   

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  1. #1
    Buhmannc is offline CHR Member Visit my Photo Gallery
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    1966 396 low oil pressure

     



    Hi I have a 66 396 that was rebuilt when I got it. The warmer it gets the less oil pressure it gets. I just tore it down. And see nothing wrong ,the cam has the groove in the rear journal, cam bearings look new, rod and main bearings look new has melling hv/hp oil pump. Oil pressure drops to 5 psi at idleand goes up to 40 when it take off.

  2. #2
    firebird77clone's Avatar
    firebird77clone is offline CHR Member Visit my Photo Gallery
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    Car Year, Make, Model: 69 nomad, 73 charger, 74 vega
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    What viscosity oil are you running?
    .
    Education is expensive. Keep that in mind, and you'll never be terribly upset when a project goes awry.
    EG

  3. #3
    Buhmannc is offline CHR Member Visit my Photo Gallery
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    Tried 10w30 and straight 30 no difference

  4. #4
    shine's Avatar
    shine is offline CHR Member Visit my Photo Gallery
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    first i would get a good mech gauge to make sure on pressure. low pressure means less restriction . the fact it comes up means the pump is doing it's job. if you loose pressure hyd lifters will tell you asap .
    Mike P likes this.

  5. #5
    Buhmannc is offline CHR Member Visit my Photo Gallery
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    2 different gauges fittings and hoses same readings. And no noise out of lifters they look new no scaring same with the cam

  6. #6
    53 Chevy5's Avatar
    53 Chevy5 is offline CHR Member Visit my Photo Gallery
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    I forgot to put a plug in one of the oil ports by the timing chain once. That made for some low oil pressure.
    Dave Severson likes this.
    Seth

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  7. #7
    NTFDAY's Avatar
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    Everything else being equal, I'd bet a stock pump would help to or cure your problem.
    Ken Thomas
    NoT FaDe AwaY and the music didn't die
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    Wild Willie & AA/FA's The greatest show in drag racing

  8. #8
    firebird77clone's Avatar
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    I'll bet a high volume pump would fix it.
    .
    Education is expensive. Keep that in mind, and you'll never be terribly upset when a project goes awry.
    EG

  9. #9
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    bearings look new???????????? doesn't quite tell what you got for clearance!!!!!!!!
    By popular opinions-just a grumpy old man key board bully--But really, if you are going to ask for help on an internet site, at least answer questions about what you are asking about-----

  10. #10
    DennyW is offline CHR Member Visit my Photo Gallery
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    You must know what the rod and main bearing clearances are. HV pump just means it will get the oil to the farthest point faster than a standard pump. 66 396 ? 10w-40 minimum. 10w-30, and 5w-30 is for newer vehicles. Type (brand) of oil is also important.
    53 Chevy5 likes this.

  11. #11
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    This is a long shot. but once I assembled a new engine, with a new Melling oil pump. When I ran the engine it only had about 30 psi. It turned out that the oil pump bypass valve bore had a burr in it from the machining tool. It was holding the bypass valve partially open.
    Last edited by Driver50x; 03-31-2019 at 08:02 AM. Reason: spelling
    Steve

  12. #12
    R Pope is offline CHR Member Visit my Photo Gallery
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    Mike or plastigage all the main bearings and mike the cam bearings.

  13. #13
    shine's Avatar
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    since the motor is torn down it's pretty much a mute point now. a rebuild will solve it .

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