Water Pressure on a 1987 150 Evinrude

[muchco]

I'm considering putting a water pressure guage on my 150. What would be considered normal water pressure? I see some guages go to 30 psi and others to 60 psi. Just wondering which one I need.

 

[KCLOST]

Re: Water Pressure on a 1987 150 Evinrude

You need the 30 psi guage...<br /><br />You should see around 10 psi at idle... 5 psi at idle when the tstats are opened... And up to 25 psi at WOT...

 

[muchco]

Re: Water Pressure on a 1987 150 Evinrude

Great, thanks very much for the prompt response.

 

[LubeDude]

Re: Water Pressure on a 1987 150 Evinrude

Originally posted by KCLOST:<br /> You need the 30 psi guage...<br /><br />You should see around 10 psi at idle... 5 psi at idle when the tstats are opened... And up to 25 psi at WOT...

I think you have the highest readings I have ever seen. Mine, (87 150), is only abour 5-6 at Idle, and around 10-12 WOT. Thats with a new impeller. Always been that way, never overheats and runs great.

 

[KCLOST]

Re: Water Pressure on a 1987 150 Evinrude

I believe the 5psi at idle Lube that is very consistent with what you should see when the t-stats are opened. But when you first start up the engine it should be around 10 psi until it warms up to open them.<br /><br />10-12 at WOT is not correct however. I have a new guage I'm sure is pretty accurate. I was out today and reached 20-22psi at WOT. Trimmed out some by the way...And at that point the poppet was open...<br />I can see when my poppet valve opens around 2500-3000 psi.. It will go up to 15-20psi and then jump down to about 10psi when it opens and with more throttle will continue back up to 20...You have to throttle up slowly to see it however.<br />(25psi might be a stretch, but I said up to!!! )

 

[KCLOST]

Re: Water Pressure on a 1987 150 Evinrude

If it's not overheating, I wouldn't sweat it... Do you have the original lower unit on the motor? <br /><br />I don't know if you remember my post last fall when I lost almost all water pressure on the lake... I found that the gasket under the pump cover blew out just in one small spot (there was a photo that showed it) and that alone caused me to go from the 20-23 psi at WOT to about 10-12psi...<br />I caught it in time thankfully when I noticed my temp guage was reaching 240F... <br /><br />At idle the pressures read about 1psi, and only about 2psi at no-wake speeds... Scary situation.

 

[phatmanmike]

Re: Water Pressure on a 1987 150 Evinrude

hey lube man, yours is a merc and this one in question is a evinrude.<br /><br />different beast.<br /><br />mercs have always had lower psi readings and omcs usually were higher, with the exception of the 90's loopers.<br /><br />just a thought

 

[KCLOST]

Re: Water Pressure on a 1987 150 Evinrude

I'm telling like it is... 1986 Merc 175 hp...