Quote:
Originally Posted by LakeErieFishing
I've had it on muffs. Water passes through the system and increasingly so as you push the RPMs up. Comes out through the two exhaust ports on either side of the outdrive (lower hull) and through the prop hub, with gusto. I've pulled the drive and a small trace of water was in the gimbal housing bellows but nothing that would indicate a backup or problem there.
I'm going to run the engine without the thermostat and see what happens.
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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.