persistent high temp readings

dwouncmd wrote: 8122pbrainard wrote: baitkiller wrote: I want to know where Bret is finding dime bags. I haven't seen one of those in decades... WOW, you are bringing back memories of collage and yes for me that was decades ago! Collage, that's funny. Is that what one sees when under the influence of said psychedelic?

a dime bag useta last us all weak....err week. no collage here.



john

Keep in mind the horn takes a bit of current to blow, or at least it should. So if the gauges bounce when you honk it I wouldn't be too concerned but if lights etc cause it to dip, check the ground like mentioned before.

baitkiller wrote: I want to know where Bret is finding dime bags. I haven't seen one of those in decades...

WOW, you are bringing back memories of collage and yes for me that was decades ago!

I want to know where Bret is finding dime bags. I haven't seen one of those in decades...

Swatkinz wrote: How do I confirm the oil pressure and voltage gauge accuracy?

What do the gausges read? Voltage is easy to verify with a VOM but it would be nice to know what the gauge reads normally.
Same with the oil pressure. What does it read when cold and then at operating temp? To verify you can remove the sender and screw in a cheap mechanical gauge to see what that says compared to the dash gauge.

When you replaced the temp sender what ohm range did you use?

Hollywood wrote: First of all you should be running a 143 thermostat. 160s are for EFI engines. Second, if the engine is cool then it's simply a read out problem. Could be the sender, wiring or the gauge. We know that a weak or low voltage ground will cause high readings across the dash. Are the voltage and oil pressure accurate?

+1 on all accounts. My '02 has a gauge issue and it consistently reads around 180. Once in a while it will go just above 180 but then if I tap the gauge it will drop back to 180. Definitely a gauge issue on my boat and I am anal about watching it "just in case". Last year my impeller spun some vanes and I watched it climb up so I headed straight to the dock. I carry a little dime bag of impeller pieces in the helm pocket as a reminder to keep an eye on the temp. One of these days I'll get around to replacing the gauge.   

Have had some scary water temp issues that have been off and on for the past year (or so). Found some air leaks and other issues that have been remedied, but high temp readings persist. Impeller is good. Thermostat is a 160degree and was replaced last summer.

Currently, I can crank the boat on the hose in the yard using the toilet flusher up under the boat. Get the boat to operating temperature and the gauge will read from 180degrees to 210degrees. This is at idle. I've doubted the gauge reading so I purchased an IR thermometer to confirm and what I've found is that when the boat reads b/w the 180 and 210, I can find no spot on the engine or manifold that exceeds 165. The exhaust manifolds too aren't too hot to rest your hands on them even when the gauge reads 210.

I've replaced the temp sender. To check the gauge, I removed the wire from the top of the sender and grounded it out. When doing so, the gauge pegs to the right.

Last summer, during one of these "high readings," I removed the thermostat and it made no difference in the temperature problems.

What next? I was told that a gauge either works or it doesn't. That's about the last thing to check here no?   

Any other suggestions?