View Full Version : Low Engine Temp?
09-16-2013, 01:58 PM
The normal operating engine temp on my '02 LTR has always be 160. Last Saturday it climbed to 120 and then barely moved from there. It might have gone up to around 135-140 a couple of times...then back to 120. I'm assuming this is either the temp sender or the gauge, but I'm not really sure how to check either one. Or could there possibly be something else keeping the temp down? I've had the boat for 6 years and this is the first time I've ever seen this.
09-16-2013, 02:03 PM
Thermostat may be stuck open.
09-16-2013, 02:26 PM
That makes sense now that I think about it. I originally was thinking if it was stuck open the temp should still climb somewhere close to 160, but I guess when 68 degree water is constantly running though it that would be kinda hard.
Anyone happen to know what the part number is? There's a few different ones on Skidim.
09-17-2013, 03:20 PM
This happened to me this year at the end of the season. At one point it wasn't even climbing over 110. After popping the thermostat cover, it turns out that chunks of rust were preventing the thermostat from fully closing. I cleaned it out and it's been working fine since. Unless your thermostat is old, I'd recommend just checking it out before ordering any parts. If something has propped it open, clean it out and put back together.
09-17-2013, 03:24 PM
You can put a thermostat in a pan of water with a thermometer and heat it up to see what temp the stat opens at.
09-17-2013, 04:28 PM
I had a similar issue on my 97 prostar 205 this summer. I assumed it was the sending unit. I talked to a buddy who is a certified MC mechanic and he said he uses and infrared temp sensor and shoots the front of the heads and right around the sending unit to verify the temp gauge. I did that and it was really cold, matched the gauge. It had been several years since they(my motor has 2) had been replaced so I ordered new. When I opened it up there was a big piece of impeller stuck in the thermastat holding it open. A previous owner must have had an issue at one time and it just worked its way out of the motor.
Short answer - if you have a IR temp gauge shoot the heads for a running temp to rule out the gauge.