No oil pressure, loose pump chain - Honda Foreman Forums : Rubicon, Rincon, Rancher and Recon Forum
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post #1 of 55 (permalink) Old 03-12-2013, 02:51 PM Thread Starter
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No oil pressure, loose pump chain

Hi, Iím new to this forum. Iíve worked on cars and motorcycles but itís the first time I work on an ATV.
I have a 2001 Rubicon 500 with 4700kms and Iím having some issues which seem to be quite common with this model. Iíve read through a lot of threads on this forum and found most of the information I need. However Iím still puzzled with something.

Symptoms:
- Engine is making a weird grinding thumping noise
- Wonít shift into any gear (as if I was always in neutral)
- No oil pressure at all RPMs

I removed the front crankcase cover and the chain was still on the sprocket, but it was so loose that I can easily slide it on and off.
Here are my questions, is it normal that the sprocket is loose (I can wiggle it on the shaft)?
I tried to unscrew the bolt holding the sprocket and it spins freely. Iím confused because the sprocket is not turning but the bolt is. Is it possible that the sprocket stripped on the shaft?
thanks
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post #2 of 55 (permalink) Old 03-12-2013, 03:02 PM
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Welcome to the forum...

sounds like a malfunction with the oil pump itself. the bolt should back out while the sprocket is held in a fixed posistion.

Won't go into a gear because u need oil pressure to propel the tranny. the chain should have very minimal play but not enough to slip the chain off the sprocket.

did u try rotating the sprocket around 360* while pushing it toward the oil pump? (maybe the bolt holding the sprocket on the pump backed out a bit and is allowing the sprocket to spin on the shaft)

'02 Rubicon
Hondamatic spun a bearing @ 8507 km

Built , not bought



Who has a 450 final drive gear they want to sell? need it for a Gear Reduction on my Rubicon?... Get at me if you do...
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post #3 of 55 (permalink) Old 03-12-2013, 03:21 PM Thread Starter
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Thanks. I did try to push the sprocket towards the pump but it just keeps spinning freely. Is there a way to lock up the pump so that I can unscrew that bolt?
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post #4 of 55 (permalink) Old 03-12-2013, 03:23 PM
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if u could get something like a screwdriver inside the pump to lock up the propellers, that woud work but will prolly damage the internals.

'02 Rubicon
Hondamatic spun a bearing @ 8507 km

Built , not bought



Who has a 450 final drive gear they want to sell? need it for a Gear Reduction on my Rubicon?... Get at me if you do...
Tea Time is offline  
post #5 of 55 (permalink) Old 03-12-2013, 06:14 PM Thread Starter
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yeah, that`s something that would concern me.

Do I need to remove the clutch to replace the chain? Can it be threaded over the crank and then spliced together? Or does the chain come in one piece?
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post #6 of 55 (permalink) Old 03-12-2013, 06:20 PM
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the chain is in one piece. the clutch needs to come off.

'02 Rubicon
Hondamatic spun a bearing @ 8507 km

Built , not bought



Who has a 450 final drive gear they want to sell? need it for a Gear Reduction on my Rubicon?... Get at me if you do...
Tea Time is offline  
post #7 of 55 (permalink) Old 03-12-2013, 06:22 PM
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The oil pump chain is not long enough to go over the clutch.You have to pull of the clutch.
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post #8 of 55 (permalink) Old 03-24-2013, 01:53 PM Thread Starter
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Is it normal that the outer clutch housing can move about 1/16" back and forth?
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post #9 of 55 (permalink) Old 03-24-2013, 02:05 PM
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Location: New Brunswick, Canada
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not if the nut is torqued properly

'02 Rubicon
Hondamatic spun a bearing @ 8507 km

Built , not bought



Who has a 450 final drive gear they want to sell? need it for a Gear Reduction on my Rubicon?... Get at me if you do...
Tea Time is offline  
post #10 of 55 (permalink) Old 03-29-2013, 12:18 PM Thread Starter
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So I finally got the clutch off and managed to also remove the oil pump sprocket. Here is what happened. The sprocket stripped on the shaft, the bolt stripped all the threads in the shaft and the shaft has a crack in it.

I don't have a choice but to replace the pump.
Do I need to remove the engine from the ATV to get to the pump?
Are there any other components that I should replace while I am there?
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