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Farmall & IHC Tractors Discussion Forum
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Super C - Fluctuating oil pressure when warm?

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tractorsam

01-30-2007 14:58:29




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When I run my Super C it holds brilliant oil pressure when cold, 3/4 or a little more up the gauge, but when it's warm the pressure is still good ('bout half way up, needle vertical) but the needle seems to waver. It's almost like it's pulsating for some reason, needle moves about 3/16ths back and forth or so. I've got it torn down at the moment to investigate and antifreeze leak so I thought I might try and tackle this at the same time. Any bright ideas about what I should look to for a cause? Many thanks, tractorsam

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Cedric

01-31-2007 01:35:02




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 Re: Super C - Fluctuating oil pressure when warm? in reply to tractorsam, 01-30-2007 14:58:29  
I had a Super A that did the same thing. I go along with the comments of Bob M and Jim N. Sid.



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hydro

01-30-2007 18:58:02




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 Re: Super C - Fluctuating oil pressure when warm? in reply to tractorsam, 01-30-2007 14:58:29  
I've been running a C with a 72" mower deck since 1980. The first year (1980) I was very nervous, the oil pressure would be very high for a short time and then would slowly drop to near zero. That was 27 years ago. It's still running fine.



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Bob M

01-30-2007 18:24:50




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 Re: Super C - Fluctuating oil pressure when warm? in reply to tractorsam, 01-30-2007 14:58:29  
A pulsing oil gage hand seems pretty much normal for the Farmalls of this era. Both my SH and SM so it. I've seen it also in friends' B, H, MD and others.

The cause I believe is a combination of 2 things: 1 - Fluctuating oil flow (hence pressure) resulting from an oil supply hole drilled in a rotating part (camshaft maybe?) going in and out of register with the pressurized oil feed hole in he mating bearing, and 2 - A sensitive oil pressure gage (ie. a gage with very little damping of the movement)

As long as your Super C is showing 1/2 gage when hot I wouldn't worry about it.

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tractorsam

01-30-2007 17:50:17




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 Re: Super C - Fluctuating oil pressure when warm? in reply to tractorsam, 01-30-2007 14:58:29  
Thanks for the help, I'll have a nose round the oil pump before I put it back together again. I haven't decided whether to replace the rod bearings or not, they don't appear worn but they do seem a bit pitted from sitting. Tempted to change them but I don't really want to get into spending a whole lot on it right now. I found the antifreeze in the oil doing a change and it'll be getting 15W-40 when it goes back together again. Thanks again, tractorsam

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Dave BN

01-30-2007 15:17:56




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 Re: Super C - Fluctuating oil pressure when warm? in reply to tractorsam, 01-30-2007 14:58:29  
Additionally there is a pressure relief plunger and spring in the oil pump. The spring might be broken or the plunger and or spring might be worn. Dave



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Janicholson

01-30-2007 15:15:15




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 Re: Super C - Fluctuating oil pressure when warm? in reply to tractorsam, 01-30-2007 14:58:29  
When the oil holes in the crank line up with the pressure hole in the gallery, the pressure effectively dissapears. This is a common reality on a engine with hours, and a pump that could use the plate sanded. I would use 15-40 oil in it when put back together, But not worry too much. JimN



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El Toro

01-30-2007 15:05:50




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 Re: Super C - Fluctuating oil pressure when warm? in reply to tractorsam, 01-30-2007 14:58:29  
It may be your oil pump. It may be worn internally, housing worn or cover plate warped.
Check the screen for sludge too. I would check that rod and main bearing clearance using plasti-gage. Hal



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