Allis Chalmers Model B or C oil pump and filter

[Mic736]

Hi
Do you know what is the diameter of the small hole on the top of the tube element going into the oil filter? On the Allis Chalmers model B or C ?
I saw on the forum, the gauge indicator is only the oil pressure at the oil filter? Is it correct?
If so, no indication of the pressure in the lubrication line? And i guess that if the pressure is low, it is not a problem?
Only may be bad oil filtration in the case ot low pressure?
Thanks

 

[Jim.ME]

About 1/8" if I remember right.

 

[mdm1]

That's right and 1/4" down from top.

 

[Aaron SEIA]

Hi
Do you know what is the diameter of the small hole on the top of the tube element going into the oil filter? On the Allis Chalmers model B or C ?
I saw on the forum, the gauge indicator is only the oil pressure at the oil filter? Is it correct?
If so, no indication of the pressure in the lubrication line? And i guess that if the pressure is low, it is not a problem?
Only may be bad oil filtration in the case ot low pressure?
Thanks
View attachment 150847

If you study that picture and your lines, you will see that the gauge pressure IS line pressure and has to be whole system pressure as well. It is also a low pressure system in general only making 10-15 psi when new and tight.
AaronSEIA

 

[4wdtom]

Hi
Do you know what is the diameter of the small hole on the top of the tube element going into the oil filter? On the Allis Chalmers model B or C ?
I saw on the forum, the gauge indicator is only the oil pressure at the oil filter? Is it correct?
If so, no indication of the pressure in the lubrication line? And i guess that if the pressure is low, it is not a problem?
Only may be bad oil filtration in the case ot low pressure?
Thanks
View attachment 150847

As has been said, 10 to 15# is good. I have seen worn engines show no oil pressure when hot and working, but they had still had flow and kept going.