TRANS FILL OIL PLUG O-RING QUESTION

[BCOWANWHEELS]

CAN SOMEONE TELL ME THE DIAMETER OF THE RUBBER O-RING ON THE SCREW IN OIL FILL PLUG ? IS IT 1/8" OR SMALLER. I HAVE ALL THE OTHER SPEC'S. GETTING DOWN TO THE SMALL STUFF NOW ON MY RESTO.
THANKS
BOB

[1950Panhead]

The trans oil plug did not come with a seal from the factory for 41 to 54, don't know about later years.
You coud use a .875" brass or copper washer.
Jerry

[panhead]

partno. 6700, drain plug gasket 5/8" x 13/16" x 1/32"

[BCOWANWHEELS]

THANKS PANHEAD I GOT A 1/8" THICK AND I JUST KNEW IT WAS TOO THICK. I,LL GET A THINNER ONE TODAY.
REGARDS
BOB

[Cotten]

Bob and All,

There is a problem with applying a flat seal washer to the filler plug, and many other plugs on our machines.

The threads are 7/8"-18tpi, but they are back-cut at the head of the plug to ~.750".

Thus any washer must have .830"+ minimum inside diameter to twist over the threads, leaving the washer sloppy on the back cut, and prone to walking eccentrically when tightened.

Otherwise, I would be offering them cut from PEEK.

O-rings don't last but they are cheap; pick one with a 3/4" inside diameter, if you think you really need it.

....Cotten

[john HD]

i just went to the hardware store and got an oring that fit snuggly.

john