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Thread: Indian four oil pump adjustment.

  1. #31

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    I just tried with two different gauges, and when I set the spill as low as 50, the adjuster is only in by a few threads. What would be the "Down side" To setting the spill rate to high ? By the way The engineers bored the cases, made oversized bearing shells and white metalled them, but they are white metal bearing specialists and not engine builders.

  2. #32

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    Just to add, There is 3/16" tread going into the pump at 50lbs spill pressure, and that's with cold, SAE 50 classic oil.

  3. #33
    Join Date
    Jan 2008
    Posts
    177

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    I would guess that if your bearing clearance is set to spec. and using 50 weight oil, then you have little or no oil flow through your bearings. It is all going out the bypass.
    Tom

  4. #34

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    Hi Tom, I was trying to set the spill rate as Roy and Larry described (With the pump out of the motor ) And I just wondered what would happen if the spill rate was to high ?

  5. #35

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    Hi Larry, I have just noticed that somehow (I must have forgotten to press the send button ) I don't think you received the thankyou reply from me ! But, Thank-you for sending the clip that showed Roy setting the spill rate, it was reassuring and not dissimilar to your method, and actually your method showed me the 15 lbs discrepancy on my gauge. Although you set the spill rate with warm oil, the oil will be cold when the motor is fist started, and I'm just wondering what the downside to having to much oil pressure would be ?
    Thanks again,
    Ivor.

  6. #36
    Join Date
    Jan 2013
    Posts
    128

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    Missed reply, all good. Your problem is a head scratcher! I agree with Tom, sounds like all your oil is going out the bypass. Too high a pressure is hard on traditional babbitted bearings. Are all your galley's open?

  7. #37

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    Sorry guys, I haven't explained it very well. I still have the pump out on the bench and just setting the spill valve, and the adjuster and lock-nut are only wound into the pump about 3/16" deep to have a 50lbs spill pressure. But I guess with a straight 50 weight cold oil, the adjuster would be wound out a fair way.

  8. #38
    Join Date
    Jan 2013
    Posts
    128

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    At what RPM are you spinning your pump?

  9. #39

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    About the same as Roy is showing in his demo. And now I'm looking at the amount of thread left on the adjuster, I don't think it is much different than mine. If I have to, can I take the timing cover off and make a further adjustment after the motor is in the bike ?

  10. #40
    Join Date
    Jan 2013
    Posts
    128

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    Was the spill valve spring replaced with the proper tension?

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