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Oil Pressure

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Phillip W. Lenke
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Oil Pressure

Postby Phillip W. Lenke » Thu Jul 21, 2005 11:02 am

I have a45 BN went through the radiator carburator H4 mag etc
Oil is straight 30 wt. But if I mow for about 30 min oils pressure slowley drops to the red mark then shuts down.
Anyone have any Ideas. am I looking at a ring job etc
Please help me diagnos.
Thanks PWL
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Patbretagne
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Postby Patbretagne » Thu Jul 21, 2005 11:44 am

it sounds like as the oil thins as it gets hot, there is somewhere that is not as good as it should be to hold it in, worn bearings, crank, big end, worn oil pump gears??????
Hope you find the answer without blowing it up!
Pat
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Bigdog
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Postby Bigdog » Thu Jul 21, 2005 11:52 am

Phil, I think you are looking at worn bearings rather than a ring issue. If it was rings you would be consuming oil and blowing smoke and seeing blow-by. Oil pressure is more related to bearing clearances and it appears that once your oil heats up and thins, the clearances are too great to maintain good oil pressure. Of course, while you're replacing bearings you might as well get the cylinders in good shape and replace the rings anyway.
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If you can't fix it with a hammer, you've got an electrical problem.

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Phillip W. Lenke
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Postby Phillip W. Lenke » Thu Jul 21, 2005 12:00 pm

Are you talking rod end bearings?
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Bigdog
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Postby Bigdog » Thu Jul 21, 2005 12:04 pm

The only way to know for sure is to plasti-gage them. But I suspect both rod and main bearings are significantly worn. More mains than rod bearings.
Bigdog
If you can't fix it with a hammer, you've got an electrical problem.

My wife says I don't listen to her. - - - - - - - - Or something like that!

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Phillip W. Lenke
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Postby Phillip W. Lenke » Thu Jul 21, 2005 12:11 pm

help me understand how this effects the oil pressure.
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Donny M
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Postby Donny M » Thu Jul 21, 2005 12:33 pm

Oil pressure is like water pressure. If you put 10 gallons per minute through a 2" pipe you will have a certain pressure. Now with the same flow reduce the size of the pipe and the pressure increases.
With worn bearings it's working opposite. As the bearings wear the clearances increase allowing for reduced pressure.
Hope this helps.
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Phillip W. Lenke
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Postby Phillip W. Lenke » Thu Jul 21, 2005 12:34 pm

I think I get it . without the proper clearances,oil does not enough back pressure through the ports. Right?
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Bigdog
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Postby Bigdog » Thu Jul 21, 2005 12:40 pm

Just like putting your thumb over the end of a water hose.

Thanks for the input Donny! I was trying to find the words and you already had it taken care of.
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Phillip W. Lenke
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Postby Phillip W. Lenke » Thu Jul 21, 2005 1:05 pm

YOU GUY 'S ARE GREAT AS ALWAYS A BIG THANKS
PHIL
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Phillip W. Lenke
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Postby Phillip W. Lenke » Thu Jul 21, 2005 1:22 pm

My cub has high pressure ,then comes down after warming up.
opposite problem or is this a problem. I had the engine done out. If so,what is the proper clearance for the cub. And how do you fix it.
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Postby Bigdog » Thu Jul 21, 2005 1:28 pm

Phil, that is pretty much normal and I wouldn't worry about it.
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Donny M
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Postby Donny M » Thu Jul 21, 2005 1:31 pm

PWL,

Two things are happening as the engine warms up. 1st, the oil gets thinner and second, the bearing clearance gets larger. How far does the oil pressure drop :?: That will determine whether you have a problem or not.
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Phillip W. Lenke
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Postby Phillip W. Lenke » Thu Jul 21, 2005 1:44 pm

About to the middle range, about to the I on the (O I L)pressure guage.
Thanks
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Donny M
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Postby Donny M » Thu Jul 21, 2005 1:55 pm

Doesn't sound to me that you have a problem.
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