Confirming temp gauge

[rondds]

160-170 is scalding. I don't think you can hold your hand on there long enough to determine if it's 160 or 220. Safer to use the IR gun.

 

[psubill78]

Well, the great news, the starboard temp gauge was just wonky. Consistently wonky though..

Throughout our 3 hour jaunt home, we shot the same spots on both motors dozens of times.. Temps within 5-10 degrees of each other each time....

Although, our trip wasn't without issue at the tail end, and that deserves it's own thread (unrelated to this )

 

[aqua*holic]

The temperature on the outside surface of the thermostat housing will not be the same as the fluid inside. I have placed my hand on many of them and if the engine is running normal it does not scald. My point was you should be able to feel the temperature of the engine changing if the gauge is correct. It is good news that gauge is just "wonky".

 

[dpmulvey]

My starboard gauge reads dead on 170 after warm up. My port gauge reads dead on 190 after warm up. Both heat exchangers read 169 - 171 after warm up. I am assuming that is the t'stat opening and closing. All 4 risers read 168.

Assuming you are fresh water cooled, with an I/O, your heat exchanger will be a cylindrical metal tube about 3-4" in diameter with a hose at or near each end and a radiator cap on the top.

View attachment 21115

It is on the front of the engine above the belts.

If you are raw water cooled, you wont have a heat exchanger. Your risers should be warm to the touch but not hot. You should be able to rest you hand there all day with no discomfort.

 

[rondds]

Dave - are you saying you shoot 168 degrees on the risers (elbows)? If so, that's way too hot. Should be 90-100 degrees.

Maybe I have my terminology mixed up. You have a riser block that sits on top of the exhaust manifold, probably 3" high. Then you have an exhaust elbow. The elbow should be 100 degrees give or take a few. I don't know what risers should read - I don't have risers - just elbows.

 

[dpmulvey]

Dave - are you saying you shoot 168 degrees on the risers (elbows)? If so, that's way too hot. Should be 90-100 degrees.

Maybe I have my terminology mixed up. You have a riser block that sits on top of the exhaust manifold, probably 3" high. Then you have an exhaust elbow. The elbow should be 100 degrees give or take a few. I don't know what risers should read - I don't have risers - just elbows.

I should have been more clear. The elbows average about 95 or so degrees depending on the temp of the water the boat is in. I need to go back to my manuals this weekend to get the proper name for the part that is showing 168*.

Sorry for the confusion.

 

[rondds]

If the part that shows 168 is just below the elbow and above the manifold, that's a riser. Semantics!