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1976 FLH shovelhead ,Transmission oil foaming.

Discussion in 'Motorcycle Tech Talk' started by BigNick, Jun 24, 2018.

  1. BigNick

    BigNick New Member

    Apr 23, 2018
    Likes Received:
    When I bought this bike a year ago the oil in the transmission was foamy or kinda yellowish it looked like to me. I assumed the previous owner used the wrong type of oil or wrong weight. I drained the oil and filled it with Harley gear oils which the dealer said was right. This month I refilled the trans and rode about 45 mph for 10 min or so. I rechecked the oil level and it was down about 3/4 inch and it was foamy. I found that the oil is leaking out around the seal in the main gear shaft. So my 2 problems are trans oil leak and something making the oil foam up. Can anyone out there think of what may be causing these problems? Any help is greatly appreciated and helpfull to us . Thank you every much. Big Nick
  2. hotroadking

    hotroadking Super Moderator Staff Member

    Jun 16, 2004
    Likes Received:
    Mouseville USA
    It’s pushing trans oil into the primary possibly through the seal.

    See if primary has too much oil

    Best trans fluid is redline. The pink stuff is known to really help in hd trans it’s called shockproof

    You need to fix the seal first

    Sent from my iPhone using Tapatalk
    BigNick likes this.

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