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Author Topic:   Water Pressure Readings for OMC V-6
Chase posted 11-08-2003 01:45 PM ET (US)   Profile for Chase   Send Email to Chase  
I have a 1983 18' Outrage with 1997 Evinrude two stroke and would like a water pressure guage. They seem to come in 30 PSI or 60 PSI. What water pressure should you expect at wide open throttle? At Idle? Thanks...
Sal DiMercurio posted 11-08-2003 08:43 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
Chase, you don't state the hp of your engine so I will assume it's a 150 Johnson.
You only need the 30 lb guage as your engine will give you close to 3 lbs at idle & 20 lbs max at WOT.
The 60 lb guage is for the newer DFI engines as mine gives me close to 30 lbs at WOT & 3 lbs at idle.
Anything before 1997 needs a 30 guage.
simonmeridew posted 11-09-2003 09:21 PM ET (US)     Profile for simonmeridew  Send Email to simonmeridew     
I agree with Sal...30 psi guage is what you want. My 70 OMC 2 stroke shows 7-10 psi at idle(including on the muffs) and about 25 at wot. The owners manual showed a plug in the top of the water chamber cover which I just unscrewed and inserted the fitting(teflon tape)and ran it to the guage. (Cabela's....I think it was $30.)
BTW a car with a leaky water pump which is low on coolant will not show overheating(at the temperature guage) until it's too late. Evidently the thermocouple needs to be immersed in the coolant to indicate temperature changes.
I like a pressure guage.
Bigshot posted 11-10-2003 02:43 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Mt 225(94)Johnson is about 7 @ idle and 25+WOT.
Chase posted 11-11-2003 10:13 AM ET (US)     Profile for Chase  Send Email to Chase     
Thanks for the information, I asked at a local BMC dealer and he sold me the 60 PSI....I specifically told him a 1997 150 HP Evinrude with carbs...I should have asked here first...Thanks
Sal DiMercurio posted 11-11-2003 08:46 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
Chase, are you sure that 97 Evinrude is carbed & not a FICHT?
If it's a ficht, you must go with the 60 lb guage, if it's carbed, [ the breathers look like carb covers but their just breathers for the injection system on a DFI or FICHT ].
If your sure it's a carbed engine, then the 30 lb is correct.
I'm not sure when OMC went to all injection on the Evinrudes & all carbed on the Johnsons.
I thought it was 97 but might have been 99.
Chase posted 11-12-2003 10:40 AM ET (US)     Profile for Chase  Send Email to Chase     

It is a 1997 150 Evinrude with two three barrel carburetors...I made sure after I emailed you about reliability of that year when compared with the Ficht engines...It is a new engine I found at a local dealer it was part of a set ordered for a boat back in 1997 counter rotating engines. One was a countering rotating ficht and one was a carb...They got put up and forgot about because of problems with OMC and Ficht. Problem most employees of this dealer are young and seemed to have forgot about carbureted engines. It has been difficult getting parts I need etc.

This engine has been in a box since its manufacture date of 11/26/96 (Model E150EXEUC) never been about lower unit oil - need a change, how about water pump, etc...I don't know how much just setting does to an engine even a new engine?


Sal DiMercurio posted 11-12-2003 11:10 AM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
Chase, rule of thumb is, change the water pump every 2 years, 3 years max even if the engine hasen"t been run, because the blades [ fingers ] will set & loose their elasticity & wont pump near as they should & you will have over heat problems.
Change the lower unit oil every 75 hours of running time.
Many people think just because they only have 40 or so hours of running on their 5 year old engine, that the water pump is fine, thats not the case, it's how long that rubber empellor has been in there [ run or not ], not the amount of running time.
3 years is max on an OMC.
Merc recommends every 100 hours on the water pump.
Bigshot posted 11-12-2003 12:20 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Definately check the lower unit oil, it might not have any. Also do the water pump impeller, no need to change the whole pump being new.
Chase posted 11-13-2003 05:30 PM ET (US)     Profile for Chase  Send Email to Chase     
Thanks everybody for the responses...

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