Hooked up pressure gauge today

[shelbydriver]

200 94 merc carbbed. Hooked up a pressure gauge. running hot at low speeds. High speed fine 140 ect. pressure is only 10 or so at high speed gulp 2 at low speed. I know this is the high pressure system should be banging 20 plus at the needle. changed everything stats, pump housings, impellers (3) bla bla bla, anyone?

 

[clanton]

Re: Hooked up pressure gauge today

Water pressure 12 lbs at 5500 rpms.

 

[shelbydriver]

Re: Hooked up pressure gauge today

Hmm interesting I was thinking it should be a larger number<br />Tim

 

[clanton]

Re: Hooked up pressure gauge today

The specs from 1992/99 Merc manual printed Sept 1997.

 

[robalofish]

Re: Hooked up pressure gauge today

I'll second that -- mine runs right about the same....

 

[ronmold]

Re: Hooked up pressure gauge today

Do these pressure gauges use an electronic sender or an actual hose?

 

[trumanlake]

Re: Hooked up pressure gauge today

86 200hp 20-25 @ 4500rpm 11-14 psi @ idle thermos closed

 

[roscoe]

Re: Hooked up pressure gauge today

A hose, "t'd" into the water line or directly into engine. Water pressure pushes air up to the guage.

 

[shelbydriver]

Re: Hooked up pressure gauge today

I plumbed the gauge into the hose on top of the block between the two heads.Not the hose that connects the two thermostats.

 

[robalofish]

Re: Hooked up pressure gauge today

Right where it should be....<br /><br />>RFish>

 

[shelbydriver]

Re: Hooked up pressure gauge today

I did not notice any difference in water pressure when the poppet valve opened. It is now running cool over 4000 rpms but hot 170 when at idle or cruise. I suspect something is funky with the poppet install. When pressing the cover on it seems like the poppet valve is open a little and not pressing up against the block? Will take out again and peek in there.