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Old 12-30-2022, 08:22 PM
Dave Neptune Dave Neptune is online now
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Question Info needed

First welcome to the MMI Afourian Forum.

Lets talk cooling first off. Don't worry about the t-stat just yet!! You state that no water drained out of the pump when the cover was removed, was the water valve feeding it on the thru-hull open?
Next when it was running was water coming out the exhaust?

To find the bypass valve~~follow the line from the pump to the "Tee fitting" on the side of the block below the alternator. The line should connect to the tee and another line will go from there to the "t-stat housing" and in this line should be a valve, the bypass valve. When the valve is closed all of the water from the pump is forced through the block for maximum cooling. The valve is adjusted open until the running temp of 120~140* is achieved, opening the valve allows water to "bypass" the block thus causing the engine to run warmer due to less water.

You did a tune up now don't touch anything but do check to see if the C-advance is operating. To do so just remove the dist cap and give the rotor a twist. It should rotate a bit and when released it should snap back. It does need to work for proper running.

RE fuel go ahead and replace the filter and check all of the fuel line connections from the tank to the carb to be sure they are tight.

It would also be a good idea to do a dry compression test and then a wet one. Test with all of the plugs removed and the throttle wide open, Do each cylinder twice and record your findings, Then spray some oil (WD-40) into the cylinders and test again twice on each cylinder. Do give a little spritz to the cylinder being tested when testing. Again record your results.

Get some answers for us and the diagnosis can begin.

Dave Neptune
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