Prostate Exam of a Yanmar 1GM10

[Solitude]

Yes I spent my afternoon with my finger in the rectum of my 1GM10.

I read quite a few posts where it was recomended to check the mixing elbow and replace after 500 hours. I decided it was time.

I have quite a bit of space around the engine. I went to work draining the water muffler and then removing the exhaust hose from the elbow.
Inside the hose was a loose metal pipe. WTF? was my thought.

I managed to remove the hose and pulled out the tube. It seemed to be corroded and broken at one end. I was able to get my head around and look up into the elbow. Looked fine on the inside no carbon.... but what was the tube.

I decided to remove the elbow... replacing a gasket never costs to much. It came off easy. Then I realized that the pipe that was in the exhaust hose was the inner sleeve of the elbow.

So now its time to buy a new exhaust elbow.

The exhaust elbow connects directly to the head on a 1GM10. It was caked with carbon. In order not to damage the head, I spent the afternoon carefully scraping the carbon and brushing it out with my finger. (I didn't want to chip carbon into the cylinder)

How carefull do I need to be? I can see the exhaust valve stem.

I would like to get a drill with a wire brush/wheel on it and clean it out. I dont want to remove the head. I don't want to damage the exhaust valve or knock carbon into the cylinder. Should I be concerened?

Oh and by the way where is a good Yanmar Dealer online that will ship to Vancouver. Yanmar parts cost a fortune up here compared to the States.