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Discussion Forum

Re: H oil pressure

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Michael Soldan

03-24-2001 05:03:26

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Jerry , some one may shoot me ,but I think that older engines often show oil pressure that way. My old M will do that,so long as theres pressure when she's working hard I figure everything is getting lubed,and yes it will drop on an idle when the engine is hot and the oil is a little thinner.Drop a tin of duralube in the H and you won't need to worry as long as you get readings on the gauge. That's my two cents.Good Luck from Mike Soldan In Exeter,Ontario

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ltf in nc

03-24-2001 05:58:23

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 Re: Re: H oil pressure in reply to Michael Soldan, 03-24-2001 05:03:26  
Michael, I agree with you and if Jerry has 15 lbs. at hot idle the tractor has a lot of life ahead of it prior to an overhaul. Just reading oil pressure at hot idle is usually good enough as it still has volume of oil flow. How much oil pressure does a air cooled engine with an oil slinger or a chainsaw have? hehe!

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03-24-2001 06:32:36

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 Re: Re: Re: H oil pressure in reply to ltf in nc, 03-24-2001 05:58:23  
I was told by a old Ford Mechanic that if you see any oil pressure at hot idle, relax. I had a old Ford one time that sat near 0 (zero) oil presure hot idle. If the engine is running quiet, then the cam bearing are probably getting worn. Depending on the use you are giving it, it will probably out last you, as long as you use the correct 30 weight oil.

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Bill C

03-24-2001 07:18:53

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 Re: Re: Re: Re: H oil pressure in reply to gibby , 03-24-2001 06:32:36  
10 psi.or more with warm oil at idle(1/4 throttle)is OK

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03-24-2001 20:41:31

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 Re: Re: Re: Re: Re: H oil pressure in reply to Bill C, 03-24-2001 07:18:53  
Thanks for the information on my H tractor i guess i wiil go ahead and run the tractor thanks again

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03-25-2001 22:50:54

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 Re: Re: Re: Re: Re: Re: H oil pressure in reply to jerry, 03-24-2001 20:41:31  
The owners manual for my 1934 Allis Challmers WC says 7psi oil pressure is normal. different tractor, i know, just thought it was interesting to note this.

I agree with the other comments given so far.

In an engine, a drop in oil pressure at low rpm indicates worn parts [relief valve, cam bearings, main bearings, rod bearings].

The clearance fit of all these parts is what provides the "back pressure" that gives you the oil pressure shown on the gauge (as long as the pump is working correctly). As these parts wear more and more, oil pressure will continue to drop more and more at idle, eventually it will drop at higher rpm also.

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