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D4 7U Injection Pump Fuel Galley Cleanup

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1 month 1 week ago - 1 month 1 week ago #231235 by outbackrider
Getting my D4 7U 9689 up and running, I had to pull the governor to get the starting pinion out.  For any concerned about messing with a governor, it was an easy removal, once I saw that I had to remove the lower bolt holding the governor spring, I could then unbolt the lever that links to the injection pump.  I found this to be an efficient design.   As I was in that far, I figured, might as well pull the injection pump and replace the 2 o-rings 8B4967 and the cam seal 4B4865.  As a side note, I used a 12” C-clamp to help pull/press in the o-ring at the end of the fuel galley, its tight, but with some dull screwdrivers, I had it pulled/pressed in, in about 10 minutes.  Glad I made the effort to do the work, what I found was the front o-ring was leaking, the end cap o-ring was fine, the cam seal was completely worn.  Sorry for the long play-by-play, but I found the fuel galley had been rusting, and it had accumulated a good amount of rust at the 4th pump.  I removed the pumps, and carefully honed the fuel galley, clearing it all out well with spray  brake and carb cleaner.  The 4th ferrule was clogged, I got that cleared and polished.  Part of the ferrule had corroded, but I don’t think I should try to mess with it—thoughts, difficult to pull or press in?  What would you suggest I do on the injector line, I figured I would try to blow it out, to make sure it is clear?  Also, anything I can/should do for the 4th injector, I believe chances are good that it has crud in it.  Thoughts/advice?  Thanks.
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Last edit: 1 month 1 week ago by outbackrider.

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1 month 1 week ago #231243 by edb
Hi OBR,
I would leave the ferrule as it will likely update to a different design that suits the later forged body pumps that do not have the bleed screws.

As a by the way---
they are tight in the housing and the update ones are even tighter and hard and so shattered when we tried to fit or pull damaged ones at the Dealer.
The update ones have an orientation and installed height that must be followed.
Cheers,
Eddie B.
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1 month 1 week ago #231245 by neil
I had a ton of crud in my 5U's gallery, and I suspect it was like that the last time it ran years ago. Half blocked at the #4 end. Clean as a whistle now though and it guess it's a good sign that the crud was able to settle out rather than going through the injectors, although of course we'd prefer not to have any crud in there at all. I fitted a water trap / filter in the supply line from the tank so that should further reduce the crud getting to the injection pumps

Cheers,
Neil

Pittsford, NY
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1 month 1 week ago - 1 month 1 week ago #231254 by outbackrider
Thanks Eddie B for the info on the ferrule...perhaps in another 50 years or so, it will need to be replaced by a machine shop. I'm going to replace the ferrule o-rings and button it all up.

Thanks Neil for the info, sounds like they were about in the same rusted condition, I really don't think #4 was getting much fuel, if any. If you could provide the model filter/separator you installed, I'm thinking that needs to be on my list. I'm also going to pull the 3 filters and see about cleaning out the fuel tower, any tips on that process? Best.
Last edit: 1 month 1 week ago by outbackrider.

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1 month 1 week ago #231262 by trainzkid88
any aftermarket water separator will work just get one with a plastic or metal bowl instead of glass as glass is a bit too fragile for crawler tractors.
and remember the lucas/cav style will leak if overtightened as the seals move out of place. i have a parker-racor type unit on my machine.
the filter tower simply drain it wipe it out and rinse clean with diesel and of course fit new filter elements.
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1 month 1 week ago #231272 by neil

Cheers,
Neil

Pittsford, NY
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1 month 1 week ago #231275 by outbackrider
Great, thanks all for the replies.

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1 month 1 week ago #231280 by neil
Forgot to answer your other question about the filter tower. I had to dig a few inches of hard sediment out of the bottom of mine and spent quite some time on it making sure that it was as clean as I could make it. It should be another 70 years before it's that bad again, maybe longer now with the additional inline filter on it. Going forward it should be just a rinse.

Cheers,
Neil

Pittsford, NY
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