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  #11  
Old 17th August 2009
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Originally Posted by IronMick View Post
It seems that "oil transfer valve" is incorrect terminology. Can someone look this up in a parts book and post the actual correct name and part number please.
J&P sells it as part of the "breather" kit - part number 740-974
OEM part number for the transfer valve is 25075-55

Both J&P and V-Twin refer to it as an "oil transfer valve"
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  #12  
Old 17th August 2009
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Originally Posted by FourCams View Post
J&P sells it as part of the "breather" kit - part number 740-974
OEM part number for the transfer valve is 25075-55

Both J&P and V-Twin refer to it as an "oil transfer valve"
OK, does the FM and OEM parts book refer to it as a transfer valve? or a breather valve? I am interested because it seems to me that transfering oil is not its main function, but that acting as a breather is main, and that oil transfer is an unwanted side effect??
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  #13  
Old 17th August 2009
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Originally Posted by IronMick View Post
OK, does the FM and OEM parts book refer to it as a transfer valve? or a breather valve? I am interested because it seems to me that transfering oil is not its main function, but that acting as a breather is main, and that oil transfer is an unwanted side effect??
I'm trying to get some clarification on that as well: http://xlforum.net/forums/s...d.php?t=581947
I'm looking through the FM and so far I don't see it mentioned in the crankcase or oiling and breather section of the 59-69 FSM.
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  #14  
Old 17th August 2009
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Originally Posted by madfox22 View Post
The oil transfer valve allows oil from the crankcase to enter the primary side only if you have excess oil, or pressure in the crankcase.
It's not supposed to allow oil from the crankcase into the primary. If it does it is malfunctioning. It is a one-way valve. The flow is supposed to be from the primary side to the crankcase.
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  #15  
Old 17th August 2009
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Originally Posted by IronMick View Post
OK, does the FM and OEM parts book refer to it as a transfer valve? or a breather valve? I am interested because it seems to me that transfering oil is not its main function, but that acting as a breather is main, and that oil transfer is an unwanted side effect??
I hate to say this but I have 3 generations of factory manuals from 59 to 84and I can't find a reference to it in any of them. But, I know it's a crankcase "breather". Therefore I do not plug them. But I also use 60 wt in my tranny and my engine. So if oil spashes over it's not a problem. But I do know that it's main function is not to oil the transmission.
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  #16  
Old 18th August 2009
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Originally Posted by FourCams View Post
I'm trying to get some clarification on that as well: http://xlforum.net/forums/s...d.php?t=581947
I'm looking through the FM and so far I don't see it mentioned in the crankcase or oiling and breather section of the 59-69 FSM.
You are right. I remember going through my FM and never finding anything on it. As you mentioned in the other thread, it is referred to as the "OIL TRANSFER VALVE". It is referred to as such as part #25075-55 in the HD parts manual.

But I think that Mick and MDT are right about the nomenclature being wrong.

Perhaps the whole thing is an embarrassment to HD and that is why they seldom reference it or reference it improperly in the PM (I presume).

Anyway, this topic comes up with some frequency. Maybe the couple of threads we have going will finally flush out the truth about the inscrutable ____(???) transfer valve.
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  #17  
Old 18th August 2009
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Originally Posted by RRB View Post
You are right. I remember going through my FM and never finding anything on it. As you mentioned in the other thread, it is referred to as the "OIL TRANSFER VALVE". It is referred to as such as part #25075-55 in the HD parts manual.

But I think that Mick and MDT are right about the nomenclature being wrong.

Perhaps the whole thing is an embarrassment to HD and that is why they seldom reference it or reference it improperly in the PM (I presume).

Anyway, this topic comes up with some frequency. Maybe the couple of threads we have going will finally flush out the truth about the inscrutable ____(???) transfer valve.
I hope so. It's been a source of confusion to me for quite a while. I've also heard it referred to as a primary breather valve, but usually I see it referred to as an oil transfer valve.
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  #18  
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Well, for what it's worth, my guess would be that of the initial one. Flow from crankcase -> primary. If it was "bidirectional", then it wouldn't be much of a valve. And I would think it flows from crankcase to primary, because it acts like a type of rudimentary PCV (positive crankcase valve). I've never seen any car engine have a valve that would induce positive pressure into the crankcase. But, again, I may be wrong. This is simply my opinion.
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Old 18th August 2009
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Originally Posted by SilverShark96 View Post
Well, for what it's worth, my guess would be that of the initial one. Flow from crankcase -> primary. If it was "bidirectional", then it wouldn't be much of a valve. And I would think it flows from crankcase to primary, because it acts like a type of rudimentary PCV (positive crankcase valve). I've never seen any car engine have a valve that would induce positive pressure into the crankcase. But, again, I may be wrong. This is simply my opinion.
The crankcase vents through the cam chest on the older models. They use a mechanical breather valve that's on the oil pump.
The more I think about this the more I'm convinced that it's there to vent the primary. AFIK the older models primarys didn't have a vent besides a tiny pinhole on the primary oil filler plug. As others have mentioned, when the valve is bad the oil leaks into the primary.. That would imply the the valve is designed to vent from the primary to the crankcase - when the pistons go up.
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  #20  
Old 18th August 2009
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Quote:
Originally Posted by IronMick View Post
OK, does the FM and OEM parts book refer to it as a transfer valve? or a breather valve? I am interested because it seems to me that transfering oil is not its main function, but that acting as a breather is main, and that oil transfer is an unwanted side effect??
Part # 25075-55 Oil Transfer Valve from my OEM parts book.
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