Yanmar 2gmf heat exchanger removal

[andyasj]

Hello,

does anyone have experience of removing a Yanmar 2gmf heat exchanger.

I have removed the endcaps and the heat exchanger tubes will not slide out. They move easily about 5mm but stop with a metallic clunk as if there is some other part to be removed before they can slide.

I have tried taps with a mallet but no further movement. I can't tap too hard!

I only wanted to check the condition as it is about 10 years since it was last looked at. I had the same problem then. The tubes are perfectly clear so I will just put it back together if no-one can help.

Cheers.

[djousset]

I felt the same resistance and so removed the entire exchanger of my 2gm20f off the engine block to clean it and replace both the end cap and engine block gaskets.

[andyasj]

I removed the whole thing 10 years ago - I was still unable to slide the tubes out.

[andyasj]

I made a softwood drift and used a lump hammer hard. It moved 2nd blow. Thanks for the help.

[Gary Mc]

So the tube bundle slid out?

[andyasj]

Yes. The alloy outer tube covering the tube bundle was simply stuck to the iron casing with scale etc.. Once that was broken it slid out easily.

[sailormed]

I had the same problem on a 3JH4E. Used a very long carpenter glue clamp to push it out.