I have had a problem with a water
leak in the port rear side of a Yanmar
4JH4E. It rusted a good number of components of my engine
including the motor
mount, the engine
mount that connects the block to the motor
mount, the transmission
shift handle and a few of the electrical
connections in the area. Two years ago I took all the rusted parts
off cleaned them so that they are rust free, and repainted them. Well the rust is back. I thought I had done a bad job of cleaning
them. Then I realized I had fixed the symptoms but not the problem.
What does Gord May have written under his name? I looked for a leak while the engine was running and all seemed fine. A careful inspection
of the hoses and they all seem tight. I was able to track the level of the leak b/c it was mostly below the mixing elbow
. I decided to take the hoses for the cooling
system off. They were all very tight and hard to remove. Finally I took off the exhaust Elbow
to inspect it. Three of the four bolts were very tight. I had to use a bit of leverage to get them off. The fourth was difficult to get to -- but it was loose. The rust held it on but I didn't have to "break" the nut free.
I figure this is where my leak is coming from. The exhaust
elbow is five years old and looks great inside. The flange that connects to the engine has a bit of surface rust. The gasket
is two pieces of metal that have been spot welded together at the top.
I figure I'll buy a new gasket
. Given that it is a yanmar
it should cost less then a boat buck. But not much. Should I use exhaust sealant
? This what I was thinking of using. PERMATEX Permatex® Ultra Copper® Maximum Temperature RTV Silicone Gasket Maker at West Marine
If I do should I put the sealant
on all four faces of the gasket?
Here are pictures of the parts