Pearson 303 : 2GMF Elbow Modification that saves you $$$

Oct 22, 2014
352
Pearson P303 #221 RockPort Maine
Hello Yanmar owners! The one thing I hate is when the engine doesn't start but it does turn-over great. For many reasons I'm told, air in line, bad filter, fuel lifter/pump and go's on and on. The worst part is to find out that the more you crank the chances are greater for water to backup and enter your engine. My engine starts usually on two strokes but some times it doesn't catch for 6 for some reason. However, I did notice carbon coming out the back exhaust. I was told the water bath filled up with sea water and that's was the cause and effect. Last year I decided to change out my elbow and inspect the design and came up with a solution. After cleaning out the exhaust system and re-installing a new elbow. I installed a ball-valve with lever (same dia. as hose) in between the output of the exchanger to the input elbow for raw water. Then I purchased a throttle cable used for lawn mowers and drilled a hole for the cable in the ball valve's pull lever. I made sure I measured the length of cable needed for easy access from my position at the helm. Now I pull the cable to shut the valve first! then after successfully starting the engine, I now push to let the water flow... What a comfort I feel knowing water cant back up into the engine!

Hope this helps you! Capt. Rob P303 #221
 

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Oct 22, 2014
352
Pearson P303 #221 RockPort Maine
[QUOT]=Ralph Johnstone;1189745]How did the elbow manage to crack and separate as shown in the first photo ? ? ? ?[/QUOTE]

Good question Ralph! In picture 2.. You see a slight crack caused by Hi temp,carbon and water caused the crack. The water backed up into the manifold and caused an explosion to take place! Picture 1, is while trying to remove it it fell apart.

After, Marina yanmar expert looked at it he said that's what happened cold water combustion and carbon buildup eating at elbow.

This is why I made this modification! To prevent salt water backing up periodically. Why not start engine then open water valve to play it safe!

Capt. Rob