Radiator Cap Rating ???

Sun May 16, 2004 10:01 pm

In replacing my radiator cap, the old one was rated at 7 lbs. The auto parts store only had a replacement rated at 13 lbs. Am I asking for trouble using the new one? Can't find anything in the manual that addresses this.


Sun May 16, 2004 11:48 pm

You should be safe with a 4psi cap from NAPA [No. 703-1412]
I installed one on my '52 Cub and it tested at 4psi on the radiator using air pressure[reduced] applied at the radiator drain.

Mon May 17, 2004 8:16 am

Dennis H, Remember, these radiators are old (unless you compare them to me) and weren't designed for much pressure, so I wouldn't use the 13 pound cap. get the 4 pound one, or a non pressureized one.