Merc 5.0 Operating Temp

[ja308601]

I have a 2007 290 DA w/ twin 5.0s which is new to me for this year. Prior to the season had both water pumps/impellers replaced. On my first extended cruise the running temps were normal (~170) on each engine per the SmartCraft gauge. Now, the starboard engine says it never gets above ~110 while the port engine is always in the normal range. The starboard engine trim indicator also jumps all over.

Does this sound like a wiring issue? T-stat?

Thanks

 

[Captn TJ]

Temp sensor? Do you have a temp reading infrared gun?

 

[ja308601]

Temp sensor? Do you have a temp reading infrared gun?

I do not.

 

[Captn TJ]

I do not.

They're pretty inexpensive and you'll use it more than once.
https://www.ebay.com/sch/i.html?_fr...nfrared+temp.TRS0&_nkw=infrared+temp&_sacat=0

 

[ja308601]

I ordered one. I assume I should just let the engines warm up and see what temp the starboard shows?

 

[Little Ducky]

Have you opened up your dash and with using a small jumper wire cross the wire to the other gauge reading that's reading 170 just to see if it will also read the lower 110?

 

[ja308601]

Have you opened up your dash and with using a small jumper wire cross the wire to the other gauge reading that's reading 170 just to see if it will also read the lower 110?

No, but that’s an idea

 

[Captn TJ]

I ordered one. I assume I should just let the engines warm up and see what temp the starboard shows?

yup. Use the other engine as a comparison.

 

[aerobat77]

for a very quick comparision just touch the manifolds / valvecover etc of the 110 and 170 engine . if it is really that difference you will feel it easily with your bare hands .

i guess they are equal and your temp sensor went south.

 

[Captn TJ]

for a very quick comparision just touch the manifolds / valvecover etc of the 110 and 170 engine . if it is really that difference you will feel it easily with your bare hands .

i guess they are equal and your temp sensor went south.