Water jet temperature

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Excalibur5

Cadet
Joined
Feb 14, 2012
Messages
28
Can anyone tell me what temperature the water jet should be that comes out of the engine on a mariner? Should it be cold warm or hot? The jet that comes from our engine is quite hot when we flush it with a hose using engine muffs. Is this normal or is engine running too hot and needs looking at? Many thanks for any replies
 
dish

dish

Petty Officer 2nd Class
Joined
Aug 22, 2008
Messages
151
Re: Water jet temperature

Is the tell tail that warm when running in the water??? Might just be water pressure from your tap!!! Is there a good stream coming out when on muffs or dribbling???
 
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Excalibur5

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Joined
Feb 14, 2012
Messages
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Re: Water jet temperature

there is a good stream of water coming from telltale but it is quite hot when using muffs and a hose. the jet appears after about twenty seconds of starting engine
 
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Chris1956

Supreme Mariner
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Mar 25, 2004
Messages
27,158
Re: Water jet temperature

Older Mariners do not have thermostats. On those motors, the telltale should be cold. Newer Mariners have thermostats, and the telltale could be 140*F. What motor do you have? When was the last time the waterpump was rebuilt?
 
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Excalibur5

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Feb 14, 2012
Messages
28
Re: Water jet temperature

Chris1956 said:
Older Mariners do not have thermostats. On those motors, the telltale should be cold. Newer Mariners have thermostats, and the telltale could be 140*F. What motor do you have? When was the last time the waterpump was rebuilt?
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hi thanks for reply chris. Its a 50hp 2stroke 4 cylinder believed to be a mid to late eighties model the serial number is 6542288 i think
 
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Chris1956

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Mar 25, 2004
Messages
27,158
Re: Water jet temperature

OK, Sounds like a no thermostat model. I therefore recommend you replace the impeller, wearplate and two gaskets.
 
4

444

Senior Chief Petty Officer
Joined
Jul 16, 2010
Messages
704
Re: Water jet temperature

I had a 1984 90 horse merc inline 6. Also had no thermostats and running on the muffs the water would get warm to the touch but not hot.
 
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Excalibur5

Cadet
Joined
Feb 14, 2012
Messages
28
Re: Water jet temperature

Chris1956 said:
OK, Sounds like a no thermostat model. I therefore recommend you replace the impeller, wearplate and two gaskets.
Click to expand...

Thanks for replies so are we saying the water jet from telltale on this engine should be either cool or warm and not hot?
 
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Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,158
Re: Water jet temperature

The telltale on that motor will normally be very cool, and certainly not hot. If you have hot, you have issue....
 
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