2040 injection pump question

[fixitforfree]

I had my 2040 injection pump rebuilt by a local highly recommended injection pump shop. I bought 3 new injectors from them as well. I removed my fuel tank and cleaned it thoroughly, installed a new fuel filter and blew through all of the fuel lines. After applying the new parts I see fuel at all the injectors coming from the inlet lines as expected but before I got it cranked I noticed fuel coming out between the injector and head not just the barrel nut to each injector. How can this be and what is goin on? This tractor has the conventional pencil style injectors. I never actually tightened any of the nuts to any injector because I was still in process of bleeding them when I saw fuel coming out between each injector and the head. Thanks for any tips or suggestions.

 

[Dieseltech]

The injector top seal under the banjo is not sealing, OR, the brazed banjo area is cracked.

 

[JIM MN]

Was there three new tip seals R48000 on the new injectors? Are you sure where the fuel is leaking from? Tighten all, clean up leaked fuel and try?

 

[Dieseltech]

Was there three new tip seals R48000 on the new injectors? Are you sure where the fuel is leaking from? Tighten all, clean up leaked fuel and try?

The R48000 is a carbon dam seal ONLY, it does not seal compression. The top seal R60746 is the compression seal, and if it does not seal, the carbon dam seal WILL blow, and allow carbon/soot to build up between injector and the bore, making future injector removal difficult, if not impossible.

 

[fixitforfree]

I will tighten all and get it all dry and make 100% sure where the leak is from. As for the seals each had the bottom seal down low on the OD of the pencil tip and the upper seal as well. My head was “clean” but should I have prepped the searing surface of the upper seal location with emory cloth or similar before I installed them? Maybe I don’t have the hold down strap installed correctly and there isn’t enough pressure pushing down on the injector to get the upper seal to do its job. Here is a pick of my set up as is now.

 

[fixitforfree]

The R48000 is a carbon dam seal ONLY, it does not seal compression. The top seal R60746 is the compression seal, and if it does not seal, the carbon dam seal WILL blow, and allow carbon/soot to build up between injector and the bore, making future injector removal difficult, if not impossible.

I got it cranked. I tightened all of the fuel lines at the injectors and it cranked within 2-3 seconds. The fuel I saw was just residual running down front the fuel lines that had loose. I have zero leaks now but I think my timing is off… I made sure to not turn over the engine after I removed the pump but somehow I’m pretty sure I am one tooth off. It just doesn’t sound right. What are the odds that when I put my pump back on somehow I jumped one tooth between the gear and the mating idler?

 

[Tx Jim]

Did you pressure test injectors before installation?

 

[fixitforfree]

Compression test showed only 210psig on #1 cylinder yet well over 300psig on #2 cylinder. I only have a 300psig gauge and the needle went way past 300. I would guess at least 350. It’s confirmed that #1 has a compression issue. I have no idea if it’s a broken ring, busted piston or burnt or broken valve but the head must come off to learn more. Thanks for all the help and suggestions.