2120 Ijection Pump Leak

Anonymous-0

Well-known Member
Hi all,

I have a 2120 with the roto-diesel (or whatever it's called) injection pump. Lately it's been leaking from the top where the post comes out of the pump that's operated by the kill-switch. Looking at the parts manuals, it seems the top of this pump (no idea what to call it, the cover or whatever) looks like it'd be relatively easy to take off so I could get to the o-rings underneath.

Before I go ripping into the injection pump however, I wanted to ask you guys if this is a good idea. I was going to clean it all really well so I wouldn't be introducing and dust/dirt into it, then carefully take off the top, replace the o-rings and gasket for the top cover, and bolt it back together.

Is this do-able? I don't want to have the whole thing fall apart when I take the top cover off. I know there's a lot of arguments about who can work on injection pumps. Some people think that the only people who should work on them are licensed NASA engineers, working in a climate-controlled room with a haz-mat suit on under 20 feet of purified diesel. Others think they can rebuild them in the bush using a brick and a piece of twine. I think the truth is somewhere in the middle, and I don't want to start any arguments over this since I know there's been a few arguments already about this subject.
 
Yes, it can be done on engine, but my experience has been it's best to reseal the whole pump. Too many times I've seen other leaks show up shortly after, but it's your call.
 
If it's only leaking around the shafts you need a top cover kit.
Not easily installed. There is a tricky spring under there to contend with. I guess if you mess up you can then remove the pump and take it to someone experienced.
 

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