Yanmar 2GM problem

[jimbunyard]

Originally Posted by svHyLyte

The replacement interval on the OEM mixing elbow on the engine is 500 hours. Obstruction will cause the symptoms you describe. The good news is that the replacement is not that difficult. The bad news is that the replacment part is not inexpensive. BTDT...

If this is the one needed




167.00 for an aftermarket stainless seems to me very reasonable indeed, at least compared to those from other manufacturers...

https://hdimarine.net/product/gm-sta...-mixing-elbow/

[svJasmine]

That is what you need. I don’t think it wil last forever, but perhaps longer.

[Cheechako]

Uhhh, is your prop loaded with barnacles etc?
My 3GM30 had the original exhaust elbow at near 2500 hours when sold.

[sharkwatcher]

Originally Posted by Cheechako

Uhhh, is your prop loaded with barnacles etc?
My 3GM30 had the original exhaust elbow at near 2500 hours when sold.

No, my wheel and bottom are cleaned monthly.

[bil56]

and that ?
ExhaustElbow.com

[sharkwatcher]

Originally Posted by bil56

and that ?
ExhaustElbow.com

pretty carbon'd up!

[Richard Kollmann]

If you think it is the exhaust elbow it can be visually inspected without replacing it. Remove exit hose and use a mirror to look inside. You will see two passage ways water interring and exhaust, restriction to flow begins at the joining point of the two. In very sever cases deposits will move back to stainless steel union an cause a stress crack in cast iron elbow.

Two areas you may have overlooked are error in tachometer do to oil on flywheel ring gear confusing the speed transducer. Or exhaust hose to water lift muffler or hose from water lift to exhaust through hull heat damaged. When blockage occurs high temperature will cause interior exhaust hose delimitation restricting flow.