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jimh

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Reply with quote  #16 
Quote:
Originally Posted by olypopper
Your engine temp should be a bit higher.


How does the pressure release valve compensate for the seawater temperature and cooling water pressure?

The water in the northern lakes is rather cool in summer. Lake Superior might be only 50-degrees in August. If a boat is running 55-MPH in cold water, I would expect the E-TEC will run cooler than if going 20-MPH on some lake with 75-degree water.

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olypopper

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Reply with quote  #17 
Quote:
Originally Posted by jimh


How does the pressure release valve compensate for the seawater temperature and cooling water pressure?

The water in the northern lakes is rather cool in summer. Lake Superior might be only 50-degrees in August. If a boat is running 55-MPH in cold water, I would expect the E-TEC will run cooler than if going 20-MPH on some lake with 75-degree water.


I’m not so concerned with cruising speed temp. The OP’s claim of mid 140 degree temps at low speed indicates an internal leakage of either the thermostat seals or pressure relief valve. I normally see cylinder head temps on 90 degree engines somewhere in the 160’s at low speed and once the boat reaches planing speeds the engine temp will drop off sharply and dependent on water temps will be somewhere between 95-130 degrees in my experience.

The PRV has no means of compensating for water temps. It is simply a poppet valve that is operated by a given pressure being applied to the cooling system.

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Trash4071

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Reply with quote  #18 
Here are some pictures I took at different speeds from low to high , highest was only 30 mph
Already down to 105 thanks all

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olypopper

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Reply with quote  #19 
Quote:
Originally Posted by Trash4071
Here are some pictures I took at different speeds from low to high , highest was only 30 mph
Already down to 105 thanks all


What gearcase and what part number PRV are fitted to your engine?

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Trash4071

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Reply with quote  #20 
Factory, above my pay grade lol
Sorry
jimh

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Reply with quote  #21 
Quote:
Originally Posted by olypopper
I’m not so concerned with cruising speed temp.


COPY THAT. Now I better understand you initial comment.

—jimh

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Make your own EV-Diagnostics cable.

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Trash4071

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Reply with quote  #22 
U think it’s something to follow up with or u think this low temp is fine ?
Thank u
PhilH12

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Reply with quote  #23 
Not to answer for the guys, but see Oly's post #17 above - it sounds like low temp, even at low rpm's.  That could be "doubling the problem" with your low temps at higher speeds - Leakage + cold  water temps + PRV opening.

Phil

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Trash4071

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Reply with quote  #24 
Ok ty
steelhead

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Reply with quote  #25 
At minimum, we need model # off transom bracket, BuCu options on these motors.  Serial # will help identify any warranty changes done to motor

Those old analog gauges are inaccurate from the day they come out of the factory, temp gauges are among the worst.  Change over to new digital gauge, ICON Pro or ICON color 3.5" along with a MFD that displays Evinrude PIDS and EMM engine parameters connected on a NMEA2000 bus.  Will give you true GPS speed also.  Engine temperature sensors need to be tested per E. Service manual.

Please post up a .pdf file copy from your dealer of the latest Engine Identification report so we can see motor run temperature profile and EMM error codes

Add a water pressure sensor, record water pressures vs rpms vs speed and make a chart, 1000 rpms up every 500 rpms.  Use for future reference water pump wear.  And troubleshooting any cooling heating problems 
If you still have cold temperatures after following Oly's directions above, having real E. tech check and service the thermostats and PRV for cold water leakage, add a higher pressure PRV spring>will increase rpms where valve opens.  Higher pressure spring part # listed in later PRVs for 3.3L motors
Also can change the water pickups to lower volume for cold waters if you have the M or L2 LU case.
Want the lower water flow pickups  
5005124

WATER SCREEN KIT, High Perf


https://www.marineengine.com/parts/technical_information/omc_5005124.pdf

Trash4071

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Reply with quote  #26 
So this whole time the gauges could be wrong and Everything could be running normal ? I hope ,
I will try a few of these things , but for sure I need an accurate temp correct ,,,thanks a ton
GEB

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Reply with quote  #27 
Quote:
Originally Posted by Trash4071
So this whole time the gauges could be wrong and Everything could be running normal ? I hope ,
I will try a few of these things , but for sure I need an accurate temp correct ,,,thanks a ton


Hi,
As an interim measure, if you have Evinrude Diagnostics connect it to the motor and with the “Engine Monitor” page selected take the boat for a run and monitor readings with EvDiag
The engine parameters, ie temp ect, displayed on the Monitor page will be accurate. Compare them with the readings of your boat’s instruments to assess (their) accuracy.
Cheers
GEB

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