Engine Temp

Some impellars run 20 hours, some 200.

First check the tranny heat exchanger for debris.

Hell if I know, HW. This is why I'm here! haha I can check it out sometime though...

On that note...my dad's 90 runs around 140, has all its life. Is that cold?

Ok, I will look into it. Thank you sir!

mdvalant wrote: Running in it the driveway with the fake-a-lake it pumps water through the motor very well, as it flows out the exhaust very nicely. (kind of ruling out the impeller, and if I'm not mistaken the impeller was replaced less than 100 hrs ago.)

If you are running it on the fake-a-lake, the hose pressure could be pushing the water through the engine and the pump could be doing nothing. Put your intake hose into a bucket and see if the pump is really pumping.

storm34 wrote: Out of pure curiosity... is there a way to test a t-stat out of the boat? Maybe place it in a pot on the stove?

Exactly.

Hard to believe because you would think water pressure would have something to do with it too, but I have seen doing the pot test referred to a number of times on here.

The impellor is a great place to start. I would want to know its condition regardless, but especially if running warm. It might be in pieces all through your engine.

Bri892001 wrote: I haven't tried running it on a hose. I'm not sure of the best way to do that and didn't want to damage anything.

hose-bucket method

Your temp guage and sender could be incompatible. I was shipped the wrong sender with a new guage last year, and it read quite high. My laser temp gun read the accurate temp, so I knew I did not have an actual problem with engine temp.
An 89 should have a strainer in it.

TX Foilhead wrote: don't use automotive thermostats even if they are rated the same temp,I learned that lesson last year.

Sure to be a hit as a new Topic Section.......

What Not To Do......Perfectly good ideas that do not work....

Nahhhhhh, that would be to easy, never mind..........Boat dr

Well, I got my T-Stat from Ski Dim, so it's definitely a marine unit. It actually looked considerably beefier than the one that had been in there. But yeah, I have no idea what kind of shape the impeller is in. Is that a relatively straight forward job, any special tools?

I'll look around for documentation on how that's done, unless someone has it handy?

Oh, and mine does have a strainer. I checked it and cleaned it already, there was minimal debris. Mine had enough clearance to just unscrew the glass/plastic "jar" piece without undoing the hoses and everything.

Impeler is easy, just make sure you mark the flow direction first because some of them can be installed bacerds.

The thermostat was an exact copy of the 160 it was replacing. What was different, and I had to put both in a pan to find this out, was that the auto one opened slowly while the marine on opened all the way at 160. It was the slow opening that was causing the problem in the boat, ina vehilcle that is running 200+ that wouldn't have been an issue. It might even be an an alright thermostat to use in the winter here so the heater works a little better, but too much of a PITA to have to change it all the time.   The boat runs between 160 and 170 in water that is 80 to 85 in the summer and 150 to 160 in 45 to 50 degree water in the winter. We rarely see 3000 rpm's so it stays fairly cool most of the time.

Almost forgot, last night while I was working down at the dock one of the weekend neighbors showed up. He uncovers his low hour 06 Mastercraft which I don't believe has even touched the water this year and fires it up 3 feet above the water. Then he lowers it down to about 6in above the water and starts it again and lowers it into the water running. As he drove by the dock I mentioned he should keep an eye on the temp guage because the impeller won't last long running it out of the water. He kind of ignores me and drives off, comes back about 5 minutes later, parks the boat opens the hatch and starts making phone calls. Wish I was a little closer so I could have heard what he was saying.

I'm not sure what it was, but I had the same issue with 2 different thermostats I got at Napa. First one looked different so the second time I made sure I got one that looked the same. Might just be some of that special Chinese engenieering or something.

Not the wrong tstat, it's the one I wanted and the one I bought been using 160 for the last 600 hrs or so. I like the boat a little warmer because we run with a lite load at slower speeds. If we spent the day footing or wakeboarding with some ballast then it might run in the range it does now with a 143. Yes I can run it up in the mid 40's and get the temp up above 180, but really not that big of a deal as long as I know everything is cooling properly it's still running cooler than the truck that brought it to the lake.    

As for the neighbors with more money than sense, I'm glad they are there because without them I couldn't live at the lake full time, they are entertaining.   I'm also glad they are only around on the weekends during the summer. That leaves me a lot of time to have the lake almost to myself and my aparentlly overheated boat.

With or without the old impeller, you should be able to figure out how to comb it at installtion. If you took your pump off, hold it sort of where it goes in the boat. You have a left hand rotation motor, so envision, with your pump in place, which way it will rotate. Form the blades in the proper direction as you push the impeller in.

Question to anyone else: Does it really matter which way the blades are "combed" upon installation? Won't they just flip to the rcorrect orientation when you turn the pulley, either by hand or when back on the motor? I just replaced mine a few weeks ago and that seemed to be the case.