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

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

Active Threads
0 Hot Chicks on Hot Bikes
Last Post: NLXL
Posted On: 1 Minute Ago
Replies: 10,548
Views: 1,883,314
0 Keep & Kill
Last Post: fafcpa
Posted On: 15 Minutes Ago
Replies: 15,321
Views: 862,720
0 This week on Craig's list
Last Post: Larry May
Posted On: 29 Minutes Ago
Replies: 4,550
Views: 565,861
0 Getting Hammered
Last Post: Bryan83taco
Posted On: 1 Hour Ago
Replies: 94
Views: 6,676
0 so where the heck is insane shane?
Last Post: doodah man
Posted On: 2 Hours Ago
Replies: 5
Views: 198
0 Sportster kick stand
Last Post: ldurmon
Posted On: 2 Hours Ago
Replies: 2
Views: 116
0 K&N Air Filter for old SE style backing plate?
Last Post: John Harper
Posted On: 3 Hours Ago
Replies: 7
Views: 286
0 What do you get when you buy a bike ?
Last Post: Nibelungen
Posted On: 3 Hours Ago
Replies: 3
Views: 99
0 never mind
Last Post: IXL2Relax
Posted On: 3 Hours Ago
Replies: 131
Views: 9,692
0 Magneto Sportster's 1964 XLH Restoration Project
Last Post: Larry May
Posted On: 3 Hours Ago
Replies: 22
Views: 1,023
0 Sleeve cylinders?
Last Post: needspeed
Posted On: 3 Hours Ago
Replies: 12
Views: 329
0 Trans/Year Interchangeability Question
Last Post: ferretface
Posted On: 3 Hours Ago
Replies: 175
Views: 5,740
0 ....1
Last Post: Graywolf
Posted On: 3 Hours Ago
Replies: 5,082
Views: 301,177
0 Sportster Cobra seat
Last Post: Ferrous Head
Posted On: 4 Hours Ago
Replies: 14
Views: 360
0 Hottie of the day, no nudity.
Last Post: trainman
Posted On: 4 Hours Ago
Replies: 16,362
Views: 1,593,753
0 How many have converted their 883 to 1200?
Last Post: Nibelungen
Posted On: 4 Hours Ago
Replies: 391
Views: 108,955
0 Crusty's Travels
Last Post: BKB
Posted On: 4 Hours Ago
Replies: 2,737
Views: 387,977
0 Official XL Forum Random Image Thread (NO NUDITY!)
Last Post: Ireeman
Posted On: 4 Hours Ago
Replies: 46,193
Views: 7,320,280
0 Rain pants
Last Post: mikeLI_77
Posted On: 4 Hours Ago
Replies: 5
Views: 108
3 Wtb, Wts, Wtt, Wtg (Ironhead)
Last Post: Rhode Warrior
Posted On: 5 Hours Ago
Replies: 47
Views: 244,452
0 Riding Classic Harley 1939EL Knucklehead
Last Post: NLXL
Posted On: 6 Hours Ago
Replies: 0
Views: 64
0 Which Battery?
Last Post: 60Gunner
Posted On: 6 Hours Ago
Replies: 54
Views: 15,222
0 lengthen master cylinder
Last Post: kobra50
Posted On: 6 Hours Ago
Replies: 24
Views: 261
3 Shaky Dave Recovery
Last Post: ezmerf
Posted On: 7 Hours Ago
Replies: 152
Views: 15,646
0 Broken bolt holes/ mounts, can they be fixed?
Last Post: NGOT8R
Posted On: 7 Hours Ago
Replies: 8
Views: 233
0 cam lobes
Last Post: RicThompson
Posted On: 9 Hours Ago
Replies: 33
Views: 1,954
0 1970 XLCH Cases - Blown Trans Corner
Last Post: Tim The Grim
Posted On: 9 Hours Ago
Replies: 11
Views: 434
0 `83 XLX rebuid and questions thread
Last Post: spamer80
Posted On: 10 Hours Ago
Replies: 243
Views: 22,226
0 Glyptal?
Last Post: bustert
Posted On: 10 Hours Ago
Replies: 24
Views: 1,131
0 Roads I'd like to ride.
Last Post: Coz
Posted On: 11 Hours Ago
Replies: 2,799
Views: 243,149
More...
Members Birthdays
nvlarry (65), Harby (65), gregor (62), Rainman (62), Dubfire (59), flathead45 (55), Shu (49), matt1971 (49), dgarber12771 (49), grino1200C (41), adamsmd127 (40), ws6envy (36), doomedcobra
Sponsored Links
Reply
 
Share Thread Tools Display Modes
  #11  
Old 1 Week Ago
Hippysmack's Avatar
Hippysmack Hippysmack is offline
XL FORUM TEAM MEMBER
 
Join Date: Jul 2014
Posts: 5,428
Sportster/Buell Model: Xl1250S
Sportster/Buell Year: 98
Other Motorcycle Model: Kawasaki Vulcan 500
Other Motorcycle Year: 95
Reputation: 5057098
Hippysmack has a reputation beyond reputeHippysmack has a reputation beyond reputeHippysmack has a reputation beyond reputeHippysmack has a reputation beyond reputeHippysmack has a reputation beyond reputeHippysmack has a reputation beyond reputeHippysmack has a reputation beyond reputeHippysmack has a reputation beyond reputeHippysmack has a reputation beyond reputeHippysmack has a reputation beyond reputeHippysmack has a reputation beyond repute
Default

The oil pump check valve plays a role in the operation of the oil pressure switch.




The check valve is not a pass through but instead a cartridge type one way check valve operated by a spring loaded cup against a seat pressing at 4-6 PSI.
Oil pressure enters the center of the check valve, lifts the cup against its spring and exits the check valve by pushing around and past the cup and into the engine.
At a point, the cup will float off it's seat up against the spring towards the end of it's travel.

According to the FSM, the check valve has two main functions;
It prevents gravity oil drainage from the tank to the engine when not in operation.
It also acts as a restriction to activate the oil pressure switch.

Without the check valve, the pressure would not build up as much in the pump.
It would free flow into the crankcase and disperse.
With the check valve installed and the oil having to find it's way around the cup, pressure builds behind it.
This back pressure builds inside the pump and pushes the pressure switch contacts open, shutting off the oil light.

The cup will stay off it's seat and open as long as there is sufficient oil pressure pushing against its spring.
This spring actuates the 4-6 PSI pressure that the pump must overcome.
If there is not enough oil pressure coming from the pump to keep the check valve cup completely or partially off it's seat;
The back pressure from the spring will push the cup toward it's seat, or closed position, equal to the amount of minimum pressure loss from the pump.

Until the seat is fully closed, the remaining oil pressure will still try to push past the cup.
At a point, the pressure from the pump will not be sufficient to completely float the cup off it's seat.
So, the cup will turn sideways a bit only allowing oil to pass it on one side.



This reduction in pressure is also sensed by the oil pressure switch.
When the pressure drops, the diaphragm eases back toward the closed position.
If the pressure is low enough, the contacts will close or partially make contact while closing or intermittently opening and closing.
The oil light will come on or flicker depending on the action of the contacts.


The pressure switch requires no back pressure from the engine to stay open.
It opens solely from the pressure generated from the oil pump with the assistance of the check valve to hold some of that pressure in the pump.
So, it is possible but not likely to have a stuck closed check valve with no oil light on.
__________________
Reference the XLFORUM'S Sportsterpedia for additional technical information & advice

In Search of Fuel, Sunshine and a Steady Idle.
Reply With Quote
  #12  
Old 1 Week Ago
1Scooter 1Scooter is offline
Flat Track Racer
 
Join Date: Jun 2016
Posts: 205
Sportster/Buell Model: XLH1000
Sportster/Buell Year: 1977
Sportster/Buell Model #2: 2004 XLH1200Custom
Other Motorcycle Model: 2007 FXDB
Other Motorcycle Year: 2004
Reputation: 56352
1Scooter is a splendid one to behold1Scooter is a splendid one to behold1Scooter is a splendid one to behold1Scooter is a splendid one to behold1Scooter is a splendid one to behold1Scooter is a splendid one to behold1Scooter is a splendid one to behold1Scooter is a splendid one to behold1Scooter is a splendid one to behold1Scooter is a splendid one to behold1Scooter is a splendid one to behold
Default

Low pressure - high volume. Don't try to improve on perfection.
Reply With Quote
  #13  
Old 1 Week Ago
Ferrous Head's Avatar
Ferrous Head Ferrous Head is online now
XL FORUM TEAM MEMBER
 
Join Date: Jun 2009
Location: Sunshine Coast
Posts: 4,864
Sportster/Buell Model: XLB, XLCH, Sporton
Sportster/Buell Year: 1962
Sportster/Buell Model #2: XLCH
Sportster/Buell Year #2: 1966
Other Motorcycle Model: XLCH (Another one)
Other Motorcycle Year: 1966
Reputation: 779666
Ferrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond repute
Default

Like tacho's, they'll just scare you if you look at 'em.

Anyway, you should be looking at the road, not instruments. That's dangerous.

An idiot light is good on a bike. It might attract your attention if it does come on. A gauge won't.
Would probably be better if we hooked the idiot light into the ignition system so it killed the engine if we lost oil pressure.

Nah, next we'll be dreaming about electric starters or some kind of fancy turn signal things. Where will it all end ? Solar powered electric Harley's ?
__________________
"I know only too well the evil that I propose. But my inclinations get the better of me."
Reply With Quote
  #14  
Old 1 Week Ago
bustert's Avatar
bustert bustert is offline
XL FORUM TEAM MEMBER
 
Join Date: Jul 2008
Posts: 9,751
Sportster/Buell Model: 1200s
Sportster/Buell Year: 2001
Sportster/Buell Model #2: xlch
Sportster/Buell Year #2: 1974
Reputation: 3014785
bustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond repute
Default

really???
where is the position in relation to the pump???
oil pressure is a result of engine restriction, truth told, the pressure switch will work with the check removed.
Reply With Quote
  #15  
Old 1 Week Ago
SHAKY DAVE's Avatar
SHAKY DAVE SHAKY DAVE is offline
XL FORUM TEAM MEMBER
 
Join Date: Jan 2011
Posts: 917
Sportster/Buell Model: XLX
Sportster/Buell Year: 83
Sportster/Buell Year #2: xlh
Reputation: 25634
SHAKY DAVE is a name known to allSHAKY DAVE is a name known to allSHAKY DAVE is a name known to allSHAKY DAVE is a name known to allSHAKY DAVE is a name known to allSHAKY DAVE is a name known to allSHAKY DAVE is a name known to allSHAKY DAVE is a name known to allSHAKY DAVE is a name known to allSHAKY DAVE is a name known to allSHAKY DAVE is a name known to all
Default

Quote:
Originally Posted by ryder rick View Post
An oil pressure gauge is useless on an Ironhead.

You cant see a gauge at night and there are no gauges made that will accurately display 3psi that you will see at a hot idle and not blow up with 80psi on a cold start. (Plus the vibration issue)

Keep the light it is the right choice.
absolutely.listen to rick.
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 02:26.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
XL Forum® - Linson Media LLC