After the motor warms up, if you can lay your fingers on the flat place on the top of the block at idle RPMs and hold them there for about a minute without a great discomfort to them, as the thermostat opens at about degrees if your engine is running about right. This may not be appropriate if engine is REAL hot as the cool water may crack or warp something, but I would do it anyway. Originally Posted by fish-on. It may flow OK until pressure builds, then it blows hot water or steam. Replacing this fitting without pulling the powerhead is challenging because you can not access the bottom front cover bolt because of the motor mount above it.
Yamaha outboard no water through tell tail - SailNet Community
It was still pumping when I pulled it off the transom of my Sport 15 and gave it to my Uncle, who probably left it in his backyard when he sold his house and moved to New York. In that year, it may have been after the thermostat. The water simply was pumped thru the motor, then was exhausted out the bottom of the powerhead into a split section in the exhaust housing. That is the correct spot to place the muffs. He was just saying the pump itself is above the plate.
This system was common to all the earlier OMC engines prior to these years and was carried over into this series of motors thru Is this a motor that was running well to start or something you just picked up and know nothing about? Charging dinghy from mothership. Wish I would have had that guage as a kid. All I needed was a new gasket. Do you already have an account? But I wanted to sell this one, so this was the solution.