ULH Oil Supply Line

[otis71]

On a 41 ULH does the supply line run to the outside of the return and vent lines or between the two?

[Tomsan]

I have a 46UL and have collected photos of U models in my travels. I reviewed my photos of a 37, 39, 40, 42, 45, and several 46s. All had oil feed lines to outside of vent and return lines. I attached photos of the 40, the 39 from HD museum, and a vintage photo. Hope that helps.

[Tomsan]

Here’s a 42

[otis71]

I viewed pictures online and saw them both ways. If you look at the 42 in the last response it looks like the two lines are rubbing as mine were. I ended up running the supply in between for now because they seemed to have more room. It doesn’t help that the header has a spiral heat shield on it which adds considerably to the diameter. Thanks for the pictures.

[Tomsan]

I looked a bit deeper. Here are some more photos of a 37,45, and several 46s.

Also check these sources:
1940-47 Service manual, pg 39

Palmer, 3rd Edition:
pg 807 1944 U (pg 689 in 2 Ed)
pg 1063 1948 UL (pg 913 in 2 Ed)