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Thread: Unable to prime oil pump 3.9 litre V8

  1. 12th October 2022, 08:37 AM #1
    Richard Kaye
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    Unable to prime oil pump 3.9 litre V8

    I have rebuilt a 3.9 for my 1988 RRC and installed it. Started it up and ran it for about 20 seconds but I cannot get any oil pressure. I had packed the oil pump with Vaseline prior to startup, this method has always worked for me but not this time. I then removed the distributor and used my oil pump priming tool with the drill. Tried for about a minute and still no oil pressure.

    I found another oil pump in the shed, packed it with Vaseline and put it on, still no oil pressure using the priming tool.

    I filled an oil filter with oil and put that on, but it didn’t help either. I removed the sump thinking that the oil pickup may not be on properly and sucking air, but the pickup was all ok. Also tried removing the oil pressure switch and filled that cavity with oil with a syringe.

    Not sure where to go from here. Does anyone have a method to get oil pressure which I have not tried? How long does it take to get the system primed using a drill and priming tool, maybe I need to wait a bit longer when priming.
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  2. 12th October 2022, 09:13 AM #2
    PhilipA
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    Have you got the correct timing cover gasket? One has a hole for the oil pump and one doesn't.
    Regards PhilipA
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  3. 12th October 2022, 09:20 AM #3
    Richard Kaye
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    I went back through the gaskets I bought, and it looks like the timing case cover gasket is an ERR4936.
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  4. 12th October 2022, 10:38 AM #4
    Richard Kaye
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    Did some more digging and it looks like I ordered the STC2823 bottom end gasket kit, I should have ordered the STC1639 kit. This is probably why I can't get oil pressure.
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  5. 12th October 2022, 10:39 AM #5
    Richard Kaye
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    It is not the ERR4936 that I have, it's the later type.
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  6. 13th October 2022, 10:25 AM #6
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    loanrangie
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    Quote Originally Posted by Richard Kaye View Post
    It is not the ERR4936 that I have, it's the later type.
    So you might have the gasket that fits the later crank driven oil pump which as Phillip said wont have the hole for the oil passage.
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  7. 13th October 2022, 06:58 PM #7
    Richard Kaye
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    When the rain stops I am going to remove the timing case cover and see what is going on in there.
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  8. 15th October 2022, 12:03 PM #8
    Richard Kaye
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    I removed the timing case cover this morning. The gasket doesn't have the extra hole but neither did the block???

    It's a 3.9 engine code is 38D, I think that means it's the serpentine belt motor with the crank driven oil pump. When I put the motor in originally about 2 years ago, I used the 3.9 block but everything else, including timing case cover and oil pump, were taken off the 3.5 and bolted to the 3.9. The provision for the extra hole for the oil pump is in the timing case cover, but no corresponding hole in the block.

    Don't understand why it got oil pressure straight away last time I put it in, now I can't get anything.
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  9. 15th October 2022, 03:00 PM #9
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    350RRC
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    Quote Originally Posted by Richard Kaye View Post
    .......................

    Don't understand why it got oil pressure straight away last time I put it in, now I can't get anything.
    Are you going by the oil pressure gauge or a rattling motor?

    DL
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  10. 15th October 2022, 03:15 PM #10
    Richard Kaye
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    Both, the motor is rattling, and the oil pressure light won't go out.
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