The Ford Barn

Mart · 01-02-2014, 03:14 PM

I'm investigating a problem on my old 21stud motor. The oil pressure would occasionally fall very low if the oil level was not kept up. I have pulled the sump and found nothing wrong with the oil pickup. So I have pulled the oil pressure relief valve and I could see it looked a bit odd, with a flat on it. This was sort of ringing a bell, as to bleed off some oil to lubricate the cam gear and water pumps. I pulled another one from a 59A motor I'm currently rebuilding and the spring was shorter, and the plunger did not have a flat on it. I pulled another one from another 59A and that was like the one from the 21stud motor.

Here's a pic:

The left hand end of the springs are level. You can see the longer spring and plunger at the top, and the flat. The other plunger looks nicely machined and in good condition. It is shorter and so is the spring.

The one in the 21 stud motor (late 37 style) is the same as the upper one in the pic, longer and with a flat.

If the upper one is correct for a 59A, any idea what motor the other one is supposed to be used in?

Mart.

01-02-2014, 03:14 PM	#1
Mart Senior Member Join Date: May 2010 Location: Solihull, England. Posts: 9,088	Oil pressure relief valve. Which type? I'm investigating a problem on my old 21stud motor. The oil pressure would occasionally fall very low if the oil level was not kept up. I have pulled the sump and found nothing wrong with the oil pickup. So I have pulled the oil pressure relief valve and I could see it looked a bit odd, with a flat on it. This was sort of ringing a bell, as to bleed off some oil to lubricate the cam gear and water pumps. I pulled another one from a 59A motor I'm currently rebuilding and the spring was shorter, and the plunger did not have a flat on it. I pulled another one from another 59A and that was like the one from the 21stud motor. Here's a pic: The left hand end of the springs are level. You can see the longer spring and plunger at the top, and the flat. The other plunger looks nicely machined and in good condition. It is shorter and so is the spring. The one in the 21 stud motor (late 37 style) is the same as the upper one in the pic, longer and with a flat. If the upper one is correct for a 59A, any idea what motor the other one is supposed to be used in? Mart.