omc water pressure ?

[vector tim]

1977 johnson 200, replaced water pump for preventive reasons, found the steel sleeve in the impeller housing had spun some, limiting the water flow, so I replaced the impeller and housing, i only have like 2 lbs of pressure at idle but when running it pegs the gauge at like 20-25 psi,what do I need to look for to correct the water pressure at idle? I removed the stats cause it would run up to 175 at idle,but runs 140-150 cruzzin do I need to remove the valves and the spring on each head too? this is a cross flow motor, thanks for any input

[EMDSAPMGR]

Mine ran 4 psi before changing the pump. After, it idles at about 7-8 lbs. At idle, it will run up to 145 temp, then down to 110 when at speed. Your high pressure is normal on that engine, the idle pressure is low. Your engine is designed to run with thermostats. If you take them out, the engine may not build up the pressure in the block, hence the issue you have now. Worse, the water may not circulate properly in the system. Leave the pressure relief valves in also. If you have a pressure guage in the system, and you still have the telltale functional, I would remove the telltale by plugging the hose. Just run with the guage. You may see the guage pressure increase.

[B.Leonard]

I run without 'em. No stats no springs no diaphrams nothin. Just too much $ and too many worries of one sticking shut (which I've had happen in salt water).

My motors run about 120 with the temp sensor on the head cover surface. They go up to 140-150 after long WOT runs 5 miles or more but never over 150 unless the pickup is out of the water :D Water psi ranges from 2-5 psi at idle to 25psi at 80 to 30+ when the pump impeller pushes open over 80 (assuming the motor is low enough in the water, Im also running a LWP).

I think you should run 'em if you run in real cold water (45 or below) or you like to go to WOT very soon after leaving the dock, but I always let the motor get warm by driving a mile or so around 3500rpm before any WOT action. I think if you do that you can avoid the stat hassles and expense on the V6 crossflow.

-BL