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Thread: Concern about oil flow - am I checking correctly?

  1. #1
    Join Date
    Aug 2020
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    Default Concern about oil flow - am I checking correctly?

    Recently purchased a 1964 Duo Glide. I've had it about a month and have only been able to ride it about 6 or 8 times. On a local ride a couple of days ago, I noticed some clatter when I was cruising a backroad at about 40mph, approx 40 minutes into the ride. It quit as quick as I noticed it. I finished the ride about 15 minutes later and noticed some grey smoke puffing out of the right exhaust while idling on the side stand. No oil light and no clatter, but I have not noticed the smoke on the other rides. I brought the rpms up a little and the smoke went away. I left it idling for a about 5 minutes while I was checking the voltage at the battery. Then, it started clattering and the oil light on the dash, and the one on the nacelle came on. I shut it down as quick as I could.

    Today, I'm starting the diagnosis. First, checked the oil tappet screen to make sure it was clean. Yep, fine. Next, I dropped the canister on the oil filter and it has oil in it. So I pulled the seat off, started it up, no oil lights. I'm still getting light haze from the exhaust at idle. I let it run for about 3 or 4 minutes
    and looked in the oil tank to see if I can see any flow. I can't see anything obvious to make me feel there is oil circulating. The tank is a little over half full. I stuck my finger in the tank, over the oil lines and I can feel air and maybe an oil mist, but no real "flow".

    Should I see a flow of oil coming back into the tank when idling? When I brought the idle up a little, no change in the flow that I could see. Any suggestions would be appreciated!

    Tim

  2. #2
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    Mar 2017
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    Yes, you should have a nice steady flow of oil flowing back into the tank at idle. Did you take out your oil filter, re assemble the canister, and check flow?
    Last edited by ryan; 08-30-2020 at 08:25 PM.

  3. #3
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    Thank you for your input, Ryan. I did not completely remove the filter and canister, just dropped it down to see if there was any oil in it before starting. There was some, but not full (as in a car). I will completely disassemble the oil filter assembly and inspect next.

    Again, thank you!

  4. #4
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    Default

    Quote Originally Posted by TimP View Post
    Thank you for your input, Ryan. I did not completely remove the filter and canister, just dropped it down to see if there was any oil in it before starting. There was some, but not full (as in a car). I will completely disassemble the oil filter assembly and inspect next.

    Again, thank you!
    The oil return will generally be spurts with obvious air in it. The scavenge side of the pump is half again larger than the feed so there is rarely a steady stream of oil unless the lower end is filled up, which is an abnormal situation.
    Last edited by Rubone; 08-30-2020 at 09:56 PM.
    Robbie Knight Amca #2736

  5. #5
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    Quote Originally Posted by Rubone View Post
    The oil return will generally be spurts with obvious air in it. The scavenge side of the pump is half again larger than the feed so there is rarely a steady stream of oil unless the lower end is filled up, which is an abnormal situation.
    Yes, the oil return gears are almost twice the size of the feed gears. The larger size return which makes sense because they are pushing against gravity.
    So are you trying to say that since the return gears are twice the size of the feed gears, the return gears are out flowing the feed gears therefore the return gears will never get enough oil to pump a steady flow of oil?


    http://www.legendmcs.com/midusa-catalog/MUpage00586.jpg
    Last edited by ryan; 08-31-2020 at 07:13 AM.

  6. #6
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    Quote Originally Posted by ryan View Post
    Yes, you should have a nice steady flow of oil flowing back into the tank at idle. Did you take out your oil filter, re assemble the canister, and check flow?
    My oil return looks like this guys bike.

    https://m.youtube.com/watch?v=8c0odEo6DeQ

  7. #7
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    Aug 2020
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    Thank you, Ryan. I’ve been buried with work this week (good thing) and have not taken the filter completely apart and clean as you suggested. I’ll get to it this weekend and report the results.

    Again, thank you!

  8. #8
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    Quote Originally Posted by ryan View Post
    My oil return looks like this guys bike.

    https://m.youtube.com/watch?v=8c0odEo6DeQ
    That's not at idle speed . . .

  9. #9
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    The most obvious sign of oil circulation when you can't visually verify is simply putting your hand on the oil tank now and again. If the tank isn't warm . . .then you know you're not circulating oil.

    The amount returning to the tank will vary greatly depending on engine speed, oil temperature, and any breather modifications.

  10. #10
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    Tim P!

    I should know better than to get into this...

    But if your motor is not returning oil, it soon fills up and lets you know it.

    Usually the plugs foul first.

    ...Cotten
    AMCA #776
    Dumpster Diver's Motto: Seek,... and Ye Shall Find!

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