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Thread: VL Oil Pump Oil Inlet Nipple Replacement

  1. #1
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    Default VL Oil Pump Oil Inlet Nipple Replacement

    Hello all, I have a VL oil pump (587-34) with an abuse oil inlet nipple. I have heard there is a replacement kit or procedure to replace the damaged nipple. Does anyone have a line on the repair kit or have/know of a way to replace the nipple?
    Thanks, William
    William Edwards, AMCA #10035

    Attend the 2019 Southern National Meet at Denton Farmpark, NC, 17-18 May 2019
    http://www.amcasouthernnationalmeet.com/

  2. #2
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    There is a repro nipple with a hex drive for inserting new nipple into threaded hole, I have used many on 37 and up flathead pumps. Not sure if your oil pump has enough material. FD801079.JPG

  3. #3
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    Thanks Shelby. I had taken a hex nipple with 1/4 NPT off an old pan oil pump and checked thread OD (0.406" at threads just below the hex) and measured the dia. below where threads stop on the VL pump (measured 0.578" dia) body. Certainly not enough material left (walls would be 0.086" thick) if a 1/4 NPT pipe tape is cut into the pump.
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    Last edited by wideglide38; 02-07-2014 at 12:45 AM.
    William Edwards, AMCA #10035

    Attend the 2019 Southern National Meet at Denton Farmpark, NC, 17-18 May 2019
    http://www.amcasouthernnationalmeet.com/

  4. #4
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    I agree this replacement nipple does not leave enough wall thickness for the VL oil pump, so have new ones made for each of these repairs.

  5. #5
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    Steve, Do you carry/sell replacement nipples or know where they can be ordered? I also wondered about grinding down the threads and Tig the nipple back up then cut new threads. Question is – Is there a die (specific to Harley’s thread pitch choice) available today to re-cut the threads? Has anyone attempted this approach with success?
    William Edwards, AMCA #10035

    Attend the 2019 Southern National Meet at Denton Farmpark, NC, 17-18 May 2019
    http://www.amcasouthernnationalmeet.com/

  6. #6
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    The replacement nipple made by Colony and others is not 1/8" pipe, it is a straight thread and should work fine. Operation best performed on a milling machine
    Kyle Oanes AMCA # 3046

  7. #7
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    Quote Originally Posted by koanes View Post
    The replacement nipple made by Colony and others is not 1/8" pipe, it is a straight thread and should work fine. Operation best performed on a milling machine
    Kyle, Agreed this should be performed on a mill. I checked Colony (oil pump fitting kit p/n 2374-1) and their fitting has a 7/16-20 thread (nom. OD 0.4375") compared to a 1/8" pipe (nom. OD of 0.405"). Appears I will have less wall thickness with the Colony kit. The OD of the stem below where the threads stop on this -34 VL oil pump is 0.575". The wall thickness with the 1/8 npt would be approx. 0.085" vs. 0.06875" with the 7/16-20 thread on the Colony kit. In either case, I don't think there is enough material to support a shaking engine with a fixed hard line.
    William Edwards, AMCA #10035

    Attend the 2019 Southern National Meet at Denton Farmpark, NC, 17-18 May 2019
    http://www.amcasouthernnationalmeet.com/

  8. #8
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    Same problem, also watching for a solution. I took off the top 3/16" of the nipple in an effort to get down to the "good" threads, not confident and no access to a machine shop.
    Rich

  9. #9
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    The threads on the nipple are 15/32" x 32 tpi which will not be a common die. As the nipples break in different spots my machinist usually makes a different aluminium nipple for each repair, so I don't stock this as a spare part. It was a poor choice of materials for Harley to go for the pot metal body as the earlier cast steel oil pumps have fewer problems.

  10. #10
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    The pipe thread is like a wedge trying to crack the hole as it is tightened. You can't comfortably reduce the OD of the fitting as you also have to consider the ID for proper flow and wall thickness. If the job is done properly, with a no stress attachment of the oil line, I cant imagine breaking the pump from use.
    Kyle Oanes AMCA # 3046

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