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John Deere Tractors Discussion Forum
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No oil presure...

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Arthur

09-25-2006 03:54:11




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In my JD 420....The manual says to look in the manual for a model 40 for anything related to the oil pump...I don't have a model 40 manual.Do you have to prime it or something? I just got done putting new rings, and a new head on it...Starts right up...no oil getting to the rocker arms, that I didn't put there myself. Put in a new gauge on it also...Still nothing...I cleaned out the screen in the oil pan,new filter,and gasget, when I had the pistons out. Could there be some kind of blockage or something?

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Mike M

09-25-2006 12:07:08




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 Re: No oil presure... in reply to Arthur, 09-25-2006 03:54:11  
I seem to remember that maybe one of the rocker arm bolts is different so as to let the oil up by it. Maybe it got switched ? Or maybe I'm thinking of something else ?

Did you have the cam bearings out ? The rear one has to line up perfect so the oil goes up past it.



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Henry M

09-25-2006 04:41:44




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 Re: No oil presure... in reply to Arthur, 09-25-2006 03:54:11  
Arthur

As I understand, you have no oil pressure at the guage location. Is that so?

The pump is self priming. Did you have oil pressure when you before you tore it down?

If you go back in and pull the pump, you will have to pull the distributor later when putting it back in and the manual also referrs you to the 40 for timing the oil pump. Whatever you do when reinstalling the pump, make sure you have the distributor out or you may damage something when tightening the pump back up.

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Wayne in Tn.

09-25-2006 08:01:57




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 Re: No oil presure... in reply to Henry M, 09-25-2006 04:41:44  
First, I would remove the oil filter base. Just 3 bolts. Sometimes those holes in the block are plugged with crud. Use a small wire and compressed air to open them up.
If this is not the problem, loosen the small oil line that runs to the head to see if oil comes out. Also if you had the cam out, that plug in the rear of the engine can obstruct oil flow to the head.



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Arthur

09-25-2006 08:53:23




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 Re: No oil presure... in reply to Wayne in Tn., 09-25-2006 08:01:57  
Thanks...I'll try that first.



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