Oil pressure but no circulation.
Thread Starter
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Cruiser
Joined: Feb 2009
Posts: 195
Likes: 0
From: Rockland County NY.
Oil pressure but no circulation.
Greetings all,
My 89 FXR has me a bit confused and was hoping for some input..
OK, project bike that was sitting for about 4 years...
I drained all fluids, cleaned carb, new rotor and sensor plate, ignition module, voes, coil, plugs, battery..yada, yada, yada..
Now, I thoroughly flushed the oil bag and replaced all oil lines, replaced check ball and spring, tappet filter, and primed the oil pump.
At cold start my oil pressure is 35-40 (taking pressure from tappet block), as she warms up pressure drops to about 10 psi @ 1100 rpm and would increase upon acceleration...I was kinda happy to see that but it didn't take long for the valve noise to start...I checked my oil level ( she did sump on me when started), oil level was ok, and noticed that my oil temp was only 90 degrees and I could see no evidence of oil returning to the bag...So I shut her down...Uh, yea, I did stick my finger in the bag..The gauge might be off a degree or two but the oil was way to cool considering it was running at operating temp.
I triple checked that my lines were run correctly.
How would it be possible for my pressure to be what it is yet have nearly no circulation?
Any thoughts you might have would be appreciated.
D
My 89 FXR has me a bit confused and was hoping for some input..
OK, project bike that was sitting for about 4 years...
I drained all fluids, cleaned carb, new rotor and sensor plate, ignition module, voes, coil, plugs, battery..yada, yada, yada..
Now, I thoroughly flushed the oil bag and replaced all oil lines, replaced check ball and spring, tappet filter, and primed the oil pump.
At cold start my oil pressure is 35-40 (taking pressure from tappet block), as she warms up pressure drops to about 10 psi @ 1100 rpm and would increase upon acceleration...I was kinda happy to see that but it didn't take long for the valve noise to start...I checked my oil level ( she did sump on me when started), oil level was ok, and noticed that my oil temp was only 90 degrees and I could see no evidence of oil returning to the bag...So I shut her down...Uh, yea, I did stick my finger in the bag..The gauge might be off a degree or two but the oil was way to cool considering it was running at operating temp.
I triple checked that my lines were run correctly.
How would it be possible for my pressure to be what it is yet have nearly no circulation?
Any thoughts you might have would be appreciated.
D
Seasoned HDF Member
Joined: Dec 2010
Posts: 7,736
Likes: 1,524
From: Coromandel Peninsula New Zealand
Return could be blocked in the tank, the sump or at the pump but if its not returning it should wet sump and sploodge all over the place....and the oil level should keep going down...
Thread Starter
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Cruiser
Joined: Feb 2009
Posts: 195
Likes: 0
From: Rockland County NY.
I have the service manual and the oil line routing diagram is not clear on which of the two connections at the tank are the return line and which is the vent line..Looking inside the tank it appears that both the return and vent lines are just 'stand pipes' that dump into the top of the tank.I don't see how reversing the two at the tank would matter..maybe I am wrong.
I appreciate the input and will keep ya posted..
Seasoned HDF Member
Joined: Dec 2010
Posts: 7,736
Likes: 1,524
From: Coromandel Peninsula New Zealand
True, also, they can take about 5 miles to stop rattling if they were totally depressurised. When I do Sporties and don't wanna take the rocker carrier assembly out I drain the lifters and remove the shafts to get the rockers out....takes a good run before they stop clacking.
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Thread Starter
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Cruiser
Joined: Feb 2009
Posts: 195
Likes: 0
From: Rockland County NY.
I will definetely check that..Do you also think that a lifter issue would explain the return oil situation?
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From: Driftless Area
What kind of oil pressure are you getting? Harleys run on low pressure and high volume, your manual should tell you what to expect. A blockage would give you higher oil pressure. Kinda like when you dial down the garden hose.
Seasoned HDF Member
Joined: May 2008
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From: South Carolina
noticed that my oil temp was only 90 degrees and I could see no evidence of oil returning to the bag...