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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 27th October 2009
sblackford sblackford is offline
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Default Oil Transfer Valve 73 Ironhead

I'm getting engine oil over in the primary side. I have been unable to find the location for the oil transfer valve that I would assume is the first thing to check. Any hint as to the location?
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  #2  
Old 27th October 2009
RRB RRB is offline
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It's just behind the primary drive sprocket. Check out this thread:

http://xlforum.net/vbportal/forums/s...r+valve&page=2
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Old 27th October 2009
sblackford sblackford is offline
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If getting engine oil into the primary cannot be caused by the oil transfer valve, how is it most likely getting there?
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Old 27th October 2009
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its not supposed to get by the valve, though it seems it always does. its quite a common problem, that the valve fails and fills your primary full of oil. check out the stickies on it, some guys block it off completely, though i cant recommend that. its actually a one way valve to allow air into the crankcase from the primary when the pistons are ascending to help with scavenging the oil in the cases. it is my opinion that if that valve is blocked it increases pumping losses, by forcing the pistons to pull against a vacuum.
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  #5  
Old 27th October 2009
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Ivan RoachCoach Ivan RoachCoach is offline
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Default Guys have been blocking it for decades with no performance issues whatsoever...

...It's a simple procedure that anyone can do.

You can either weld it shut or block it off by tapping the valve's center orifice for threads and then inserting a brass screw into that orifice.
Once it's in there, covered with permanent-strength Loctite, simply distort the screw's head by peening it.
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Old 27th October 2009
BuckIRyder BuckIRyder is offline
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Another path for engine oil to get into the primary is a failed sprocket shaft seal
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Old 27th October 2009
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Quote:
Originally Posted by BuckIRyder View Post
Another path for engine oil to get into the primary is a failed sprocket shaft seal
oh yea, theres that too
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Old 27th October 2009
sblackford sblackford is offline
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How difficult is it to replace the valve? The cost seems minimal.
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Old 27th October 2009
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Default It's a royal pain in the ass to get one out...

...which is part of the reason 99.9 % of guys just weld or plug them up.



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  #10  
Old 27th October 2009
BuckIRyder BuckIRyder is offline
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Default

To replace it you have to pull the primary drive. To get it out you have to unscrew it. It is staked in place to prevent it from loosening. I got mine out by drifting it around in a circle with a punch. It was a pain.
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