Quote:
Originally Posted by HellRaZoR004
If you are not having issues (overtemp) while on the muffs then the thermostat is not the issue - unless you are not letting the engine run long enough to get up to temperature.
The gimbal housing bellows (I'm assuming you mean for the universal joint) should not have any water in it - and will not have anything to do with cooling the engine.
I would get a large trash bucket of water and start the engine with the drive submerged..make sure to leave the hose in the bucket. If you don't see water coming from the exhaust, inspect/replace the impeller.
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Lots of water comes out of the exhaust when drive has muffs on it. At low RPM water is still squirting out the edges of the muffs (using a hose with good water pressure and volume), but increase the RPMs and the seawater pump pulls every drop of water in and significantly more comes out of the exhaust and prop hub. If the boat is dropped into the lake and left on the trailer, same thing - you can feel the amount of water coming out of the exhaust.