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Discussion Forum

Oil pressure

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09-04-2002 19:40:25

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I over hauled a WD 45 allis chalmers New bearings checked as installed and crank polished
Checked out oil pump and it showed no wear and would
dead head turning it by hand When starting out cold the oil pressure goes all the way to the L on the oil gauge then drops off to nothing when idle hot
I am using valvoline no 30 oil
I blocked the center hole in oil tube to see if there wasn;t too much by pass in the oil fillter no luck
the oil pressure still drops We put new cam bearings and checked them at 1.5
thausand clearance
How does the by pass valve in the block work
we put a small nut behind spring to give it more
pressure no luck .

So any help will help me out Thank you Harold

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Dave Grubb

09-05-2002 13:28:52

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 Re: Oil pressure in reply to Harold , 09-04-2002 19:40:25  
Put in a gage that is in the range of 0-30 punds or less. The engines normal oil pressure is 12 psi. If you did not replace the cam shaft bearings you could have a big oil pressure loss in that area. As I recall #1 & #3 main bearings and maybe #1 & #4 rod bearings are oiled after the oil passes over the cam shaft bearings.

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Fred in sunny Connecticut

09-05-2002 07:41:22

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 Re: Oil pressure in reply to Harold , 09-04-2002 19:40:25  
Harold;Take the gauge off the side (after it is warm)start the tractor or at least turn it over to see how well the oil streams out-maybe try another gauge,They never had alot of press. my wd45 is always showing low but I replaced the gauge it seems more consistent. please keep us posted


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