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Thread: Crankcase Vent - gasket or not?

  1. #1
    Join Date
    Aug 2008
    Location
    East TN, just north of Chattanooga
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    Crankcase Vent - gasket or not?

    Hi Everyone,

    My Pan (56) seems to be leaking oil between the crankcase breather stud and the engine case - just shy of where it should leak, inside the primary tins. Is there supposed to be a gasket between the stud and the case or just some RTV?

    Thanks!

    Joe

  2. #2

    Re: Crankcase Vent - gasket or not?

    Joe,
    No gasket, breather has a ledge which seals against case, check breather nut is tight.

  3. #3
    Join Date
    Aug 2008
    Location
    East TN, just north of Chattanooga
    Posts
    973

    Re: Crankcase Vent - gasket or not?

    It looks like that if the elbow is towards the front of the bike it's supposed to leak - see the relief cut. Maybe the elbow should point to the rear, the the relief would be in the 12:00 position. Or maybe I have the wrong breather stud (56)


  4. #4

    Re: Crankcase Vent - gasket or not?

    Joe,
    The tube points up, some cases have a pin that matches the slot, clean the case, clean the breather.

  5. #5
    Join Date
    Aug 2008
    Location
    East TN, just north of Chattanooga
    Posts
    973

    Re: Crankcase Vent - gasket or not?

    In doing a bit more research I think the breather with the relief cut was an aftermarket item. At least so far the original ones I see on ebay do not have the relief cut. I hope someone can weigh in on this.

    joe

  6. #6

    Re: Crankcase Vent - gasket or not?

    Joe,
    Most knuckle cases have an alignment pin, the breather needs a cutout to fit, Harley made these.
    Pan cases don't have the pin, the breather pipe changed in 48.

  7. #7

    Re: Crankcase Vent - gasket or not?

    50 panhead is right. you could sillygoober it and be ok. I wonder why it took this long to leak.

  8. #8
    Join Date
    Aug 2008
    Location
    East TN, just north of Chattanooga
    Posts
    973

    Re: Crankcase Vent - gasket or not?

    Thanks Guys! I soldered a copper washer on there and goobed it up a bit. Should be ok now.

    T-Bone - its been leaking for a long time, I just figured it was wet sumping out the inner primary drain tube. I took the inner primary off because I was changing clutch plates and wanted to have a closer look. That's when I noticed most of he oil wasn't actually making it into the inner primary (at least while it sits). Oil is still going to leak of course - its just nice to predict the spot :-)

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