Hey all, i have a quick question. I have just installed the replacement heater valve in my 280Z and I just need to know how much pressure the little thing is subject to. I have a pressure tester so I can make sure it doesnt leak, but I don't know how high i should pressureize it to. I searched around and saw something like 25lbs in one thread, but Id like a straight up answer if possible. Thanks to you all.

This is what the FSM says for the 77 280Z

SPECIFICATIONS

Engine ......................................................... L28

Radiator Type .................................................... Corrugated fin and tube

Cap relief pressure kdcm (psi) .............................................. 0.9(13)

Testing pressure kg/cm (psi) ........................ ;... ................. 1.6(23)

Water capacity

(including engine, liter (U.S. qt, Imp. qt) ...........................10.4 (11, 9 1/8) heater and reservoir tank)

Well dammit. It starts to leak around 10psi. Looks like i'll have another 2+ years to go without a heater.

25 psi is too much. 280 Master is correct with 13psi. If it leaks at 10, better think about using another one.

I yours the automaitc valve or the cable operated one?

I yours the automaitc valve or the cable operated one?

cable.

Same as mine. I'll check with my buddy who has a Z shop and see where he got the one that's in my car. I'm not promising anything, that was two years ago.

25 psi is too much. 280 Master is correct with 13psi. If it leaks at 10, better think about using another one.

280~Master is correct but the testing pressure is 23 psi. 13 psi is the cap relier pressure.

Testing pressure kg/cm (psi) ........................ ;... ................. 1.6(23)