Results 1 to 7 of 7

Thread: ULH Piston & Connecting Rod Question

  1. #1

    Default ULH Piston & Connecting Rod Question

    This project got its start about 20 years ago and then got shelved. When I took the engine apart I did not mark which rod (male or female) was for front or rear cylinder. I have a recollection that its opposite the knuckhead and other OHV engines which would make the female rod for the front cylinder. Is this correct? The other issue is the piston placement. Both of the OEM pistons have a T shaped mark on the crown directly above one of the piston pin holes. Does the T go on the gear case side or sprocket side?
    IMG_0103.jpg

  2. #2
    Join Date
    Aug 2012
    Location
    Victoria, Australia
    Posts
    179

    Default

    I believe the forked rod goes to the front up until 1939.

  3. #3
    Join Date
    Jul 2011
    Location
    Paradise, Texas
    Posts
    369

    Default

    Quote Originally Posted by Peter Cooke View Post
    I believe the forked rod goes to the front up until 1939.
    I think I am correct that all the forked rods that were in front also had the window cut-out for front cylinder oiling till end of 1938.

  4. #4
    Join Date
    Jun 2005
    Location
    Northern Colorado
    Posts
    834

    Default

    A picture of the underside of the piston might show a small "fin" cast into the piston pin boss. The fin on the boss goes to the cam side.
    VPH-D

  5. #5

    Default

    Thanks VPH-D. Here's a pic of the fin on the wrist pin boss. It corresponds to the 'T' mark on top of the piston.IMG_0117 (1024x765).jpg
    Attached Images Attached Images

  6. #6
    Join Date
    Aug 2004
    Location
    Beautiful Northern New Mexico
    Posts
    2,774

    Default

    What style rings are you using? What is the baffle configuration in your cases? When H-D started supplying better oil control rings the rod positions and baffle arrangements were changed. With most modern rings the rod position should be as the later configuration with the forked rod in the rear. Original early U series engines had an oil control ring on the front piston only along with two compression rings and three compression rings on the rear with no oil control.
    Robbie Knight Amca #2736

  7. #7

    Default

    The baffles are still in place and the pistons are original standard bore. I will be using OEM rings with an oil control ring on the front cylinder. So from your information and my configuration, I should put the forked rod to the front?

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •