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Thread: 3.9 Lifter Preload

  1. #1
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    3.9 Lifter Preload

    I am building a 3.9 to put into the 1988 Range Rover. I am up to installing the lifters and rocker gear and would like to know if the lifter preload figures I have measured are acceptable, or do I need some shims. Numbers are (in thousands of an inch),

    Cylinder Preload
    1. IN 65 EX 65
    2. IN 50 EX 50
    3. IN 50 EX 50
    4. IN 60 EX 60
    5. IN 50 EX 50
    6. IN 60 EX 50
    7. IN 40 EX 40
    8. IN 50 EX 50

    I may be out a few thou each way but these are pretty much what I measured. The camshaft is a new standard grind with new lifters and I have used composite gaskets, they are 10 bolt heads.

  2. #2
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    I have taken the measurements from the lifter depression not from under the pedestals.

  3. #3
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    I ended up just bolting the rocker gear down without any shims. Got the motor in the car over the weekend, started it today to bed in the camshaft and set the ignition timing. There are no noisy lifters, actually sounds pretty good.

  4. #4
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    If the engine is basically not modified with no major skimming of heads or block then just bolt up - the hydraulics accounts for any variations. Different if there has been major skimming.
    REMLR 243

    2007 Range Rover Sport TDV6
    1977 FC 101
    1976 Jaguar XJ12C
    1973 Haflinger AP700
    1971 Jaguar V12 E-Type Series 3 Roadster
    1957 Series 1 88"
    1957 Series 1 88" Station Wagon

  5. #5
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    The preload range is 20-50 thou, and there is less pump up at 20 thou than 50 thou.

    65 thou should be OK but is a bit marginal.
    I would probably shim a bit.
    Be careful if you make shims that the oilway into the rocker gear is clear with a keyhole cut in the shim.

    Regards PhilipA

  6. #6
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    I now have the car running, goes great. Only problem is my harmonic balancer is wobbling all over the place. I have had a quick look and a replacement, part ERC5462, are over 300 pounds. I cant seem to find an aftermarket one either. Has anyone replaced one? What are my options.

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