Fuel line tidy-up-ness help needed - D2

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Old_n_slo

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My parts book does a fantastic job of displaying nice....straight....clean...well organized, fuel lines coming from underneath the fuel tower. I'm referencing page 30 of my parts book (lower left page).

My equipment has had some owner modifications (yeah...that's what I'll call it) and I'll want to tidy that up a bit before I get to fixing my lower engine cover that will interfere with those lines.

Q1. What SHOULD the connection look like? Mine currently has tubing unions installed and a semi circle of tube for what appears to be a repair.

Q2. The good book shows two lines running downward in parallel. That's great...but to where do they lead?

Thanks!
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Wed, Nov 7, 2012 1:06 AM

drujinin

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On the J series all those lines dripped on the ground.
I believe(?) that on the U series they were spliced back into the suction side of the delivery pump.

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Wed, Nov 7, 2012 1:18 AM

Old_n_slo

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Reply to drujinin:

On the J series all those lines dripped on the ground.
I believe(?) that on the U series they were spliced back into the suction side of the delivery pump.

...thanks, I should have mentioned mine is a 3J51xx.

Kinda scary those lines leading to the ground. Not from a EPA standpoint, but from contamination to the system.

Are they vents?

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Wed, Nov 7, 2012 1:32 AM

ccjersey

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They both drip on the ground in all the U models of tractors I have ever seen. If a severe leak, they have been routed back into the suction as an owner modification, but just simpler to fix the leak, since then the fuel tank could potentially drain into the engine or at least into the fuel pump housing and governor. I see that in later J model D2's, the injector return line was connected back into the fuel supply instead of dripping onto the ground. Since the later capsule type injectors didn't have a return line, there is no similar routing for the 4U/5U.

The lines should end just below the corner of the engine where the timing case is bolted to the front of the block.

D2-5J's, D6-9U's, D318 and D333 power units, 12E-99E grader, 922B & 944A wheel loaders, D330C generator set, DW20 water tanker and a bunch of Jersey cows to take care of in my spare time😄

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Wed, Nov 7, 2012 1:32 AM

chriscokid

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Reply to ccjersey:

They both drip on the ground in all the U models of tractors I have ever seen. If a severe leak, they have been routed back into the suction as an owner modification, but just simpler to fix the leak, since then the fuel tank could potentially drain into the engine or at least into the fuel pump housing and governor. I see that in later J model D2's, the injector return line was connected back into the fuel supply instead of dripping onto the ground. Since the later capsule type injectors didn't have a return line, there is no similar routing for the 4U/5U.

The lines should end just below the corner of the engine where the timing case is bolted to the front of the block.

My D2 3J leaks pretty bad there, but I have not taken the time to fix it- any pointers on what to do and not to do?

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Wed, Nov 7, 2012 2:12 AM

Old_n_slo

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Reply to chriscokid:

My D2 3J leaks pretty bad there, but I have not taken the time to fix it- any pointers on what to do and not to do?

It ok though.....I am interested in the solution too. I'm torn between wanting to correct the problem, but not wanting to open up a can of worms.

Does yours leak during operation? Idle? Shut down?

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Wed, Nov 7, 2012 3:30 AM

chriscokid

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Reply to Old_n_slo:

It ok though.....I am interested in the solution too. I'm torn between wanting to correct the problem, but not wanting to open up a can of worms.

Does yours leak during operation? Idle? Shut down?

[quote="Old_n_slo"]It ok though.....I am interested in the solution too. I'm torn between wanting to correct the problem, but not wanting to open up a can of worms.

Does yours leak during operation? Idle? Shut down?[/quote]

Yes it leaks when it is running, when it is shut down it only drips very slowly. I believe I just need to remove the whole thing and go thru it all. This machine has 10,000+ hours on it. It has been in my family since new in 1940.

I hope you get yours fixed and if you do please share what you will learn!

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Wed, Nov 7, 2012 4:08 AM

edb

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Reply to chriscokid:

[quote="Old_n_slo"]It ok though.....I am interested in the solution too. I'm torn between wanting to correct the problem, but not wanting to open up a can of worms.

Does yours leak during operation? Idle? Shut down?[/quote]

Yes it leaks when it is running, when it is shut down it only drips very slowly. I believe I just need to remove the whole thing and go thru it all. This machine has 10,000+ hours on it. It has been in my family since new in 1940.

I hope you get yours fixed and if you do please share what you will learn!

Hi Team,
from memory the 2 lines drain to ground on the earlier S/No machines. As stated above, on later units the injector drains were connected to the transfer pump inlet.
The other lines come from :-
1/ the tower bleed screw.
2/ another comes from the transfer pump packing cavity to drain any fuel from the pump fuel side packing or oil from the engine side packing. If this line is blocked or subject to transfer pump pressure, fuel can be forced into the crankcase if the oil packing is also leaking. The packings and shaft usually wear and harden over the years and the compression spring can no longer crush the packing in its taper to keep the packing fuel tight.
3/ another drains the rack area of the injection pump. This drains off fuel seeping past the pump plungers.
If this area is not drained or is connected to gravity fuel pressure from the fuel tank head height, this area will flood the injection pump housing and dilute the oil therein and cause excessive wear from oil/fuel dilution.
The lines from 1, 2 & 3 above are teed together.

To sum up the only line that can be connected back into the system is the injector drain line as per the scan below.
The others all need to be open to drain on the ground. If you have leaks from the teed lines then you will have to disconnect the teed lines to determine which area is leaking. It is most likely the transfer pump packings that will need to be renewed and tamped to give a good seal in their tapers. Use Search to find drawings for the tooling and descriptions of the transfer pump overhaul.
If the transfer pump packing is OK then I have seen many tower bleed screws that leaked from having been overtightened or crud on their seats.

Hope this helps.
Cheers,
Eddie B.
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