The Sportster and Buell Motorcycle Forum - The XLFORUM®
 

Go Back   The Sportster and Buell Motorcycle Forum - The XLFORUM® > SPORTSTER MOTORCYCLE FORUM > Sportster Motorcycle Era Specific and Model Specific > Ironhead Sportster Motorcycle Talk (1957-1985)
XLF Blogs XLF Arcade XLF Disclaimer/Privacy Statement/Terms Of Use

Notices

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

Active Threads
0 Question on a transfer valve
Last Post: paulc
Posted On: 24 Minutes Ago
Replies: 4
Views: 94
0 You asked for it! "The Tess' Coffee Thread"
Last Post: sportytrace
Posted On: 1 Hour Ago
Replies: 10,333
Views: 716,662
14 Firearms you wish you owned.
Last Post: Nibelungen
Posted On: 2 Hours Ago
Replies: 517
Views: 82,681
0 Keith Black Conversion
Last Post: 1HD4CJM1X4K
Posted On: 2 Hours Ago
Replies: 52
Views: 3,062
0 Official XL Forum Random Image Thread (NO NUDITY!)
Last Post: sportytrace
Posted On: 2 Hours Ago
Replies: 41,838
Views: 6,453,214
0 Searching for a used Ironhead, my observations
Last Post: Akdawg
Posted On: 3 Hours Ago
Replies: 18
Views: 1,850
0 03 xlh 88"
Last Post: MatHormell
Posted On: 3 Hours Ago
Replies: 20
Views: 446
0 Vintage Stinger Ignition
Last Post: stratoblaster
Posted On: 4 Hours Ago
Replies: 0
Views: 30
0 Sportster Camshaft Degreeing ?
Last Post: Hippysmack
Posted On: 4 Hours Ago
Replies: 74
Views: 5,615
0 Roky's impulse buy 2001 Kawasaki Concours
Last Post: sportsterpaul
Posted On: 4 Hours Ago
Replies: 1
Views: 54
0 Relocated Turn Signals
Last Post: priell3
Posted On: 6 Hours Ago
Replies: 5
Views: 104
0 09 Buell XB12 crank
Last Post: Boudwood
Posted On: 6 Hours Ago
Replies: 18
Views: 573
0 Question of the month?!
Last Post: c1skout
Posted On: 7 Hours Ago
Replies: 7
Views: 155
0 Hottie of the day, no nudity.
Last Post: trainman
Posted On: 7 Hours Ago
Replies: 8,437
Views: 677,400
0 Official XLForum Poll: What kind of bars are you running?
Last Post: Caustic Dick
Posted On: 7 Hours Ago
Replies: 646
Views: 138,866
0 Were your parents anti bike?
Last Post: sportsterpaul
Posted On: 7 Hours Ago
Replies: 28
Views: 526
0 Big bore stroker - the beginning of a 10-year long build
Last Post: needspeed
Posted On: 8 Hours Ago
Replies: 803
Views: 72,853
0 Help with my clutch please
Last Post: DirtyHarry68
Posted On: 8 Hours Ago
Replies: 183
Views: 10,288
0 tried something new in my primary
Last Post: Lone Rider
Posted On: 8 Hours Ago
Replies: 0
Views: 42
0 Keith Black 10:1
Last Post: 1HD4CJM1X4K
Posted On: 8 Hours Ago
Replies: 22
Views: 697
0 My 1978 Ironhead
Last Post: VXDspud
Posted On: 10 Hours Ago
Replies: 0
Views: 52
5 Hots For An Xl Forum Member?
Last Post: Stairman
Posted On: 10 Hours Ago
Replies: 10,954
Views: 3,159,214
0 Hi from Queensland Australia
Last Post: sportytrace
Posted On: 10 Hours Ago
Replies: 14
Views: 178
0 Roads I'd like to ride.
Last Post: Sportycus
Posted On: 10 Hours Ago
Replies: 579
Views: 31,054
0 Hi from the UK
Last Post: VXDspud
Posted On: 10 Hours Ago
Replies: 15
Views: 289
0 Gravydog crashed again.
Last Post: sportsterpaul
Posted On: 10 Hours Ago
Replies: 88
Views: 4,133
0 Oil Level: Hot vs Cold
Last Post: stavenironhead
Posted On: 10 Hours Ago
Replies: 10
Views: 200
0 Rubbermount Poll
Last Post: Toejam503
Posted On: 11 Hours Ago
Replies: 249
Views: 76,958
0 :( New deep rebuild on my 90 inch
Last Post: jkinkade
Posted On: 11 Hours Ago
Replies: 125
Views: 10,518
More...
Members Birthdays
Sponsored Links
Reply
 
Share Thread Tools Display Modes
  #11  
Old 17th August 2009
FourCams's Avatar
FourCams FourCams is offline
Senior Chief Master Mechanic 1st Class
 
Join Date: Dec 2008
Location: Seattle
Posts: 1,294
Sportster/Buell Model: XLCH
Sportster/Buell Year: 1969
Sportster/Buell Model #2: XLCH
Sportster/Buell Year #2: 1972
Other Motorcycle Model: FXSTC
Other Motorcycle Year: 1996
Reputation: 5013
FourCams is just really niceFourCams is just really niceFourCams is just really niceFourCams is just really niceFourCams is just really niceFourCams is just really niceFourCams is just really niceFourCams is just really niceFourCams is just really niceFourCams is just really niceFourCams is just really nice
Default

Quote:
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"
__________________
♠ 1969 XLCH ♠ 1972 XLCH ♠ 1996 FXSTC ♠
Reply With Quote
  #12  
Old 17th August 2009
IronMick's Avatar
IronMick IronMick is offline
Rider Of The Iron Steed
 
Join Date: Dec 2003
Location: London, ON Canada
Posts: 31,423
Sportster/Buell Model: XLH
Sportster/Buell Year: 1978
Reputation: 744167
IronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond repute
Default

Quote:
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??
__________________
Mick
IronHead Forever!

Visit Mick's WebSite
[And Check Out My Autobiog]
Reply With Quote
  #13  
Old 17th August 2009
FourCams's Avatar
FourCams FourCams is offline
Senior Chief Master Mechanic 1st Class
 
Join Date: Dec 2008
Location: Seattle
Posts: 1,294
Sportster/Buell Model: XLCH
Sportster/Buell Year: 1969
Sportster/Buell Model #2: XLCH
Sportster/Buell Year #2: 1972
Other Motorcycle Model: FXSTC
Other Motorcycle Year: 1996
Reputation: 5013
FourCams is just really niceFourCams is just really niceFourCams is just really niceFourCams is just really niceFourCams is just really niceFourCams is just really niceFourCams is just really niceFourCams is just really niceFourCams is just really niceFourCams is just really niceFourCams is just really nice
Default

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??
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.
Reply With Quote
  #14  
Old 17th August 2009
RRB RRB is offline
Senior Chief Master Mechanic
 
Join Date: Jul 2006
Posts: 901
Sportster/Buell Model: XLH
Sportster/Buell Year: 1966
Reputation: 441
RRB is on a distinguished roadRRB is on a distinguished roadRRB is on a distinguished roadRRB is on a distinguished roadRRB is on a distinguished road
Default

Quote:
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.
Reply With Quote
  #15  
Old 17th August 2009
MDT's Avatar
MDT MDT is offline
Senior Custom Bike Builder
 
Join Date: Jul 2006
Location: Northern Colorado
Posts: 2,519
Sportster/Buell Model: XLCH
Sportster/Buell Year: 61
Other Motorcycle Model: Superglide
Other Motorcycle Year: 74
Reputation: 288841
MDT has a reputation beyond reputeMDT has a reputation beyond reputeMDT has a reputation beyond reputeMDT has a reputation beyond reputeMDT has a reputation beyond reputeMDT has a reputation beyond reputeMDT has a reputation beyond reputeMDT has a reputation beyond reputeMDT has a reputation beyond reputeMDT has a reputation beyond reputeMDT has a reputation beyond repute
Default

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??
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.
__________________
When you sit on something, you built from parts;
You're sitting on top of the world.
Reply With Quote
  #16  
Old 18th August 2009
RRB RRB is offline
Senior Chief Master Mechanic
 
Join Date: Jul 2006
Posts: 901
Sportster/Buell Model: XLH
Sportster/Buell Year: 1966
Reputation: 441
RRB is on a distinguished roadRRB is on a distinguished roadRRB is on a distinguished roadRRB is on a distinguished roadRRB is on a distinguished road
Default

Quote:
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.
Reply With Quote
  #17  
Old 18th August 2009
FourCams's Avatar
FourCams FourCams is offline
Senior Chief Master Mechanic 1st Class
 
Join Date: Dec 2008
Location: Seattle
Posts: 1,294
Sportster/Buell Model: XLCH
Sportster/Buell Year: 1969
Sportster/Buell Model #2: XLCH
Sportster/Buell Year #2: 1972
Other Motorcycle Model: FXSTC
Other Motorcycle Year: 1996
Reputation: 5013
FourCams is just really niceFourCams is just really niceFourCams is just really niceFourCams is just really niceFourCams is just really niceFourCams is just really niceFourCams is just really niceFourCams is just really niceFourCams is just really niceFourCams is just really niceFourCams is just really nice
Default

Quote:
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.
Reply With Quote
  #18  
Old 18th August 2009
SilverShark96's Avatar
SilverShark96 SilverShark96 is offline
Senior Chief Know It All 2nd Class
 
Join Date: Mar 2009
Posts: 1,416
Sportster/Buell Model: XLH
Sportster/Buell Year: 1978
Reputation: 242
SilverShark96 is on a distinguished roadSilverShark96 is on a distinguished roadSilverShark96 is on a distinguished road
Default

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.
Reply With Quote
Sponsored Links
  #19  
Old 18th August 2009
FourCams's Avatar
FourCams FourCams is offline
Senior Chief Master Mechanic 1st Class
 
Join Date: Dec 2008
Location: Seattle
Posts: 1,294
Sportster/Buell Model: XLCH
Sportster/Buell Year: 1969
Sportster/Buell Model #2: XLCH
Sportster/Buell Year #2: 1972
Other Motorcycle Model: FXSTC
Other Motorcycle Year: 1996
Reputation: 5013
FourCams is just really niceFourCams is just really niceFourCams is just really niceFourCams is just really niceFourCams is just really niceFourCams is just really niceFourCams is just really niceFourCams is just really niceFourCams is just really niceFourCams is just really niceFourCams is just really nice
Default

Quote:
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.
Reply With Quote
  #20  
Old 18th August 2009
72Iron's Avatar
72Iron 72Iron is offline
Senior Chief Harley Engineer 1st Class
 
Join Date: Jul 2009
Posts: 1,392
Sportster/Buell Model: XLH
Sportster/Buell Year: 1972
Sportster/Buell Model #2: Harley-Davidson
Sportster/Buell Year #2: 2009
Other Motorcycle Model: FLHTCU (Geezer Glide)
Reputation: 7813
72Iron is just really nice72Iron is just really nice72Iron is just really nice72Iron is just really nice72Iron is just really nice72Iron is just really nice72Iron is just really nice72Iron is just really nice72Iron is just really nice72Iron is just really nice72Iron is just really nice
Default

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.
__________________
I gave up smoking, drinking and sex.
It was the worst fifteen minutes of my life.

RIP: Eli
Reply With Quote
Reply

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



Sponsored Links
All times are GMT +1. The time now is 08:03.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.
XL Forum® - Linson Media LLC