On Jun 5, 12:52*pm, J wrote:
On Jun 4, 12:15*pm, jamesgangnc wrote:





On Jun 3, 3:33*pm, J wrote:

I have a2000fourwinns230 hrizon, and i am having an issue with it
over heating. I hooked it up to a manual temp gauge and it is running
around 230. I have checked everything i can think to check. we pulled
the impeller off the fresh water pump that pulls the lake water into
the engine and this rubber gear is in perfect shape. We pulled the
pump off the front of the engine and everything appears to be ok
there. We pulled off each individual cooling hose and checked for
blockage and there was nothing to be seen. Can someone please give me
some suggestions as to where I can look next to fix this over heating
problem. I even ran water backwartds out of the outdrive to check for
blockage and there appeared to be none.
THanks in advance
Justin

Check the thermostat. *It's easy to do at home. *Hang it in a pot with
some water on the stove and a cooking thermometer. *Add heat. *Watch
the themometer and the thermostat. *You'll see it open around 147 or
160 depending on which on it is.

Another spot to check is the exhaust manifolds and risers. *Those
commonly scale up until they are clogged. *The risers are the worst.
You can usually tell by probing in the hose connections. *Or just try
to blow through them.

I took the thermostat out of the boat and it still overheats with no
thermostat in the engine. I was wondering if the thermostat is
required to divert the water to the correct places, or should it run
cool with the thermostat out?
Justin- Hide quoted text -

- Show quoted text -

The thermostat is required. Most of the housings use pressure
differential to get the water to go through the engine or to skip the
engine and go straight to the manifolds. Either check the thermostat
like I described or get a new one. You didn't tell us, what engine
manufacturer do you have? Do you use the boat in salt water or
fresh? Is the cooling system raw (no heat exchanger) or closed (has a
heat exchanger)?

I'd still check the manifolds and risers for clogging. They are the
most commen thing to clog up.

Do you have muffs so you can run it in the driveway? Does plenty of
water come out with the exhaust when you run it in the driveway?