oil pressure issues

Unknown
Unknown
edited November -1 in HUDSON
I need a little help please. I just got my 308 running, and have little to no oil pressure. With a mechanical gauge hooked up to the port on the passenger side between the valve covers it shows 0 at idle and about 10 when I rev it a little. When I unhook the gauge a let the line bleed into a can the oil just drips out at idle, and becomes a more steady drip when reved. I changed the oil pump and had the same result. There are no blockages in the lines that I can see or feel. Everything is new in the engine, and I am running out of ideas. Anything will help, Thank you

Comments

  • TwinH
    TwinH Senior Contributor
    Have any luck packing the pump with vaseline?
  • SuperDave
    SuperDave Senior Contributor
    Check the bypass spring..pull the hex plug out of the drivers side of the block and check to see if the spring is on the OUTSIDE and the piston is on the INSIDE. Also make sure there is a piston in there. perhaps it was forgotten in the reassembly phase. If it's reversed or missing, the oil will bypass to the pan. Also if the spring is broken it will bypass much too early. Good luck.
  • Unknown
    Unknown
    TwinH wrote:
    Have any luck packing the pump with vaseline?

    I did try that with both pumps. I also checked the bypass. The spring was in very good shape, and the piston was also in good shape. I tried shiming the spring as well. But everything led to no luck. Thanks
  • mars55
    mars55 Senior Contributor
    Is your oil pump camshaft gear in good shape? I understand these wear alot. Is your oil pickup making contect with the oil? Not bend or stuck.
  • super651
    super651 Senior Contributor
    The Kid wrote:
    I need a little help please. I just got my 308 running, and have little to no oil pressure. With a mechanical gauge hooked up to the port on the passenger side between the valve covers it shows 0 at idle and about 10 when I rev it a little. When I unhook the gauge a let the line bleed into a can the oil just drips out at idle, and becomes a more steady drip when reved. I changed the oil pump and had the same result. There are no blockages in the lines that I can see or feel. Everything is new in the engine, and I am running out of ideas. Anything will help, Thank you



    Is the cap-plug in the front oil manifold ???

    Thanks Rudy
  • Unknown
    Unknown
    I would remove the pump and figure out a way to pump air through the port that leads to the bottom of the pickup tube to see if any restriction is observed (free air flow = no restriction; once the air is flowing, listen through the tube where you pour oil in and see if you hear bubbles from the crankcase). Similarly, I would remove the 1 1/8 in bypass plug, spring and piston and would try to pump air through the port (at pump) leading to the bypass and see what happens. You must physically verify that all the lines are OPEN and free of RESTRICTION. Then you must physically verify that the pump is actually able to pump oil (remove it and bench-test it by hand) and that the pump is turning while running. ***** Perhaps the oil pickup line/tube is blocked in some way OR there is no gasket between it and the block or it is loose (NOT SEALING properly; that gasket should have a silicone sealant on both sides and torqued down to specs (my guess ~ 15-20 psi)) and it is DRAWING AIR above the oil level (crankcase) along with a minimal amount of oil from the sump. Keep us posted.
  • Geoff
    Geoff Senior Contributor
    YOU have checked the pump gaskets and primed the pump I assume?

    Geoff.
  • [Deleted User]
    [Deleted User]
    I would also add if you pull the timing cover off check and make sure that

    the two small bolts for the oil director & timing chain rub block are installed.

    I installed a Pontiac chain conversion in mine and left these two out thinking

    that they did not do anything. The oil director would not fit with the new

    timing chain setup so I left it out. One of these bolts seals off a oil pressure

    passage so I had to go back and install them.

    Mine had about 1-2lbs at idle and 35 when reved up.

    PaceRacer50
  • Unknown
    Unknown
    Ralph, a great tip for those who upgrade to the roller chain!!



    Thanks,



    John
  • [Deleted User]
    [Deleted User]
    Make sure your oil pick-up screen is clean and free of any debris. Also make sure the pressure regulator piston is seating all the way. if there is anything between it and the end of the bore, oil pressure will be by-passed. If you are showing any pressure at all at 2000 RPM your pump is picking up oil, the problem is not the pump, you are dumping pressure and yes pull the timing cover and check to see if the oil circuit plug behind the timing chain has been left out.
  • Unknown
    Unknown
    Thanks for all the suggestions. But I have to pull the engine back out. I have discovered a cracked cylinder. It was running really hot for the two or three minutes that I would run the engine. I pulled the head and found the problem in number 4 cylinder. While the engine is out I will pull the pan before it goes to the machine shop to try to find the oil problem. Thanks for all the help
  • [Deleted User]
    [Deleted User]
    Good input PaceRacer50!!!
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