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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #1  
Old 24th October 2010
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Default 84 leaking bad from tranny vent..

My buddy has an 84 xlx1000...it recently started puking oil from the tranny vent line...checked the primary oil level and it was a little over full....drained it down to where it should be and its still leaking bad...it leaks from the sprocket seal which has allready been replaced also.....why would the tranny enough pressure to leak a basketball sized puddle in the amout of time it takes to fill the gas tank.....crank seal??? he did a compression test a few months ago and it has 110 psi in both cylinders....any ideas guys...
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Old 24th October 2010
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Did the person who replaced the sprocket seal follow the factory manual? There is a specific process involving installing the sprocket twice, once to center the seal, then the final install.

Also, it is the usual practice to apply some sealant like Permatex Ultra [whatever color] to the shaft before the final install of the sprocket.

The trans vent line is attached to a spigot on a hollow bolt on top of the trans part of the case. The line can be routed either down to ground or up under the seat area. It is most unusual for anything to drip out of that line in any normal circumstances.

Here is a pic of the primary oil level screw. Is this what you have used to get the correct level?

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Old 24th October 2010
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just sent you a pm mick...and yeah that is where we checked the fluid...let it drain from there sitting level and that was a few weeks ago....its been leaking every since....checked it after our ride today and it was very low....the vent thats leaking come from under the starter and it is leaking primary fluid...we can tell because he just changed it a month ago...and it didnt do it before the fluid change???
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Old 24th October 2010
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we have talked to alot of people about it...including a few harley techs...everboby says it shouldnt do that...obviously....and the best guess ive heard so far was a crank seal...but when we stopped a light and while riding you cant see anything leaking...but when parked you can watch it drip??
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Old 24th October 2010
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Quote:
Originally Posted by joesporty View Post
...the vent thats leaking come from under the starter ... he just changed it a month ago...and it didnt do it before the fluid change???
That is the correct tranny vent.

This is quite peculiar, to say the least. Hmmmm, change the primary fluid and now it leaks from the trans vent, a vent that virtually never spills even one drop. And the level is correct.

I do not know.
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Old 24th October 2010
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Originally Posted by joesporty View Post
....and the best guess ive heard so far was a crank seal...
I do not understand this part of the engine very well. However, i guess that would allow engine oil to leak into the primary? Then it would spew out the trans vent, but only if enough leaked in so that it would be way overfull, which it is not.
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Old 24th October 2010
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thats what i was thinking to..if it leaks pressure into the tranny from the crankcase..then engine oil would be getting into the tranny making it over full....but after it puked up in the parking lot today..we checked it and nothing came out of the oil level screw..its took just over a 1/4 of a quart to get fluid to the level screw....so that is not the issue..

also we have check the crankcase breather and its breathing fine....the fluid coming out of the vent tube doesnt have bubbles in it..like it is foaming up or boiling...it actually looks like brand new fluid...
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Old 24th October 2010
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i replaced the vent your talking about with a regular bolt and replaced the primary chain inspection plug with a vented one. oil weeps outta the inspection plug from time to time but no major leaks. i never had any problems with the vent leaking before but it may solve your problems.
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Old 24th October 2010
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is there a valve or something that released pressure into the primary from the crankcase on an 84 that could be stuck open??
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Old 24th October 2010
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Quote:
Originally Posted by asasial View Post
i replaced the vent your talking about with a regular bolt and replaced the primary chain inspection plug with a vented one. oil weeps outta the inspection plug from time to time but no major leaks. i never had any problems with the vent leaking before but it may solve your problems.
thats a pretty good idea...the drain hose was on the bottom left side of the bike...shooting oil all over the brake rotor...so we switched the tranny vent to the right side...now its oiling the chain and tire....ive read a few post where guys have pointed them up..instead of town toward the ground.....if he put a vented cap it would probably be getting on his leg....im going to visit him tomorrow..take a few pics of things...and stick my finger over the tranny vent while its running to see if it has positive pressure...
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