Olds 455 jetboat

[73WriedtCustom]

Hello.
I installed a rebuilt Berkeley 12jc pump. Hooked up the garden hose water-line's to the jet and the engine. Set the inlet valve to show about 10 psi on my intake manifold water pressure gauge. Once I got to about operating temperature, the intake manifold water pressure gauge dropped to zero.
So, i shut the system down and found water in the number 2 cylinder. (But not in the crankcase oil.) I've pulled the head, purchased new marine gaskets, and part's for my thermostatic bypass housing.
I did notice when I pulled the head, that it didn't seem to take the 85-90 something foot lbs. of torque to remove it. Also, the plastic (?) valve in the thermostat housing seemed stuck in the up position.
Anyone got any tips for me before I start cleaning things up and retorquing? (I'm thinking of replacing cylinder head bolts, and having the head(s) checked for warpage.)
:idea:
Mark

[Floored]

What kind of intake gasket are you using? #2 is next to the water port. You run a thermostat? Do you have a pic of that plastic part? With Bassetts or water logs there is no piece in the thermostat housing, just water flow control for setting temp. How old is the engine?

[73WriedtCustom]

I'm not sure what kind of intake gasket was being used. The new one I have is #655404 (Hardin marine).
The thermostat is a 160 degree. I tried boiling it with a thermometer, and it didn't seem to start opening untill about 185 or so. I purchased a new model. (160 F.).
The plastic part can be viewed here http://www.cpperformance.com/detail.aspx?ID=691
The engine had a rebuild about 3 years ago I believe. It does use the thru transom exhaust setup with the cooling water entering the logs for preheat.
Mark

[FASTRAT]

I installed a rebuilt Berkeley 12jc pump. Hooked up the garden hose water-line's to the jet and the engine. Anyone got any tips for me before I start
my "big" tip for u is...DON"T under any circumstances run the motor with the jet hooked up!!!!...dis-connect the PTO or u will be buying another pump!
fastrat

[73WriedtCustom]

Thank you very much. Too bad I don't have a test-tank available.
Guess I'm gonna have to get down to the launch early and do some tuning.
(Good thing it's only 3 miles from my driveway.) :)

[SmokinLowriderSS]

my "big" tip for u is...DON"T under any circumstances run the motor with the jet hooked up!!!!...dis-connect the PTO or u will be buying another pump!
fastrat
Well, you'll only damage the impeller to wear ring clearance, which is only critical to keeping the high-pressure water behind the impeller from leaking to the front, and causing lots of cavitation problems. :cry:
you may not buy a whole new pump, but you'll either rebuild it again, or pay to have it done.