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Thread: VL Oil Pump Oil Inlet Nipple Replacement

  1. #11
    Join Date
    Apr 2003
    Posts
    654

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    I had a look at my Vl oil pumps yesterday. I had forgotten that the pump on my 36 has had the pipe thread pipe nipple installed. Probably done 30 yrs ago, how many miles I don't know. I looked at the 34 pump and was shocked to see how small the opening in the nipple was. Around .140. It's hard to believe cold oil would have much luck passing through such a small opening. Mr. Slocombes thoughts on making a replacement nipple with a smaller thread would work fine if you maintained the small ID. I also took a look at the 33 pump and it has a much larger opening, around a quarter of an inch, so it is odd that they used a tiny feed hole for the late models.
    Kyle Oanes AMCA # 3046

  2. #12
    Join Date
    Jul 2008
    Location
    North Carolina
    Posts
    642

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    I too measured the oil inlet ID and was the approximately the same (.142) and thought about feeding cold oil through such a small opening. I wondered if the pump creates a small vacuum (an opposite affect to creating pressure on the outlet feed). Cold weather days would warrant warming the scoot for 4-5 minutes. Maybe the close proximity of the front head helps heat to the oil reservoir. Being new to VLs it just made me wonder.
    William Edwards, AMCA #10035

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

  3. #13
    Join Date
    Jul 2008
    Location
    North Carolina
    Posts
    642

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    Quote Originally Posted by Steve Slocombe View Post
    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.
    Steve, I measured the outside threads on my -34 pump body and read approximately 0.555" (close to 9/16" or 0.5625" & even closer to 14mm or 0.5512"). With 15/32" equaling 0.4688", there's a difference of 0.0862". I am also reading with my thread pitch gauge, 24 tpi (same tpi for the pan/shovel oil nipples). Am I missing something here? Are the nipple threads straight (they appear straight), tapered or pipe? btw: I did locate a company Taps and Dies (http://www.tapsndies.com/tapsndies.html ) that has hundreds of dies. Thanks
    William Edwards, AMCA #10035

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

  4. #14
    Join Date
    Jan 2003
    Location
    England
    Posts
    1,304

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    The 15/32" x 32 tpi comes from the Harley 0140 special nut which screws on to the oil pump nipple.

  5. #15
    Join Date
    Jul 2008
    Location
    North Carolina
    Posts
    642

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    Thanks Steve!

    Can anyone tell me how to get the round valve (noted with arrow) out of the pump body? Is it pressed, screwed or pinned in? I ask, since I plan to have the oil inlet nipple machined off, tapped for a replacement nipple and want to make sure all metal filings are cleaned out before reassembly. Thanks
    Attached Images Attached Images
    William Edwards, AMCA #10035

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

  6. #16
    Join Date
    Apr 2012
    Location
    Canyon Lake, Tx
    Posts
    543

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    Old thread, still the same problem. Any new answers?
    Rich Inmate #7084

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