Super C oil pressure

[Scott Bardman]

Why does my Super C loose oil pressurre when working?

 

[El Toro]

What weight oil are you using? I would use just 30wt. The cover on the oil pump may be bowed. Hal

 

[Janicholson]

As El Toro points out, Some Farmall oil pump covers deform over time and reduced pressure is the result.
Bearings are usually not a problem unless the engine is worn to a nub, smoking and with internal noise. I prefer 15-40 diesel grade oil.
If thicker oil does not affect the change, I would pull the pan and inspect the pump. There are many entries in the archives here on how to repair the pump. Some from me and others. Put in < flat sanding oil pump covers. > There are no cam bearings in the engine, so it is just mains, rods, and the top end that get pressure. The cam journals have never been an issue. Jim

 

[Scott Bardman]

Thanks for the replies. I am using straight 30 weight.

 

[Scott Bardman]

If 15/40 is ok to use I'll try that and see if it helps. Thanks

 

[Jeff Z.]

It may help the pressure some but not the oil ciculation. Thicker oil can cause more problems than it fixes.
A 10w-30 will work fine on that engine for all season use..
Even if the oil pressure drops to 5 lbs the engine will probably still be running when you are gone.
Just try to kill it.
Oil does loose it's ability to maintain pressure from heat and stress.

 

[Jeff Z.]

Just look a Harley engines. They run real hot. They run 50w oil. Harley says that on a 70 degree day you heve to drive around 60 mph for 20 some miles before the oil is flowing properly.
A thick oil in your engine that runs alot cooler will probably never reach a temp high enough for proper flow.

 

[Matt896]

Recently my dad and I rebuilt our super C and found that the face where the oil pick up mounts to pump was warped so the gasket wouldn't seal properly. Took a piece of rought sand paper on a flat surface and sanded it smooth. Has great pressure now.

 

[CNKS]

Multigrade oils are fine, 15W40 is not thick, I use it as many on this forum do. But, single grade 50 weight is probably too thick for about anything, particularly in cool to cold weather, but I won't argue about Harley. In a warm to hot climate, I would consider 10W30 to be too light for the typical loose tolerance IH engines of that era. such as in south Texas where I grew up. Same goes for western Kansas with 90-100+ degree weather in the summer. Winters are relatively cold, thus the 15W40--you don't have to change it according to season.