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Fuel Leak

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16 years 8 months ago #10806 by jshbryan
Fuel Leak was created by jshbryan
Hello, I have a pretty bad fule leak at the auxillary govenor control on my D6 9U. It has actually leaked since I bought it, but not that bad. Now it is so bad that overnight, I loose all pressure and will drain a battery trying to prime it again.

Is there a seal in there that I can order to correct problem?

Thanks,

Jason

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16 years 8 months ago #10809 by SJ
Replied by SJ on topic Leak
Can,t quite figure out what your talking about when you say aux. gov. control. The regular gov. uses motor oil in it & is a common oil system with the lower part of the injection housing where the camshaft & lifters are.

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16 years 8 months ago #10813 by jshbryan
Replied by jshbryan on topic Fuel Leak

Can,t quite figure out what your talking about when you say aux. gov. control. The regular gov. uses motor oil in it & is a common oil system with the lower part of the injection housing where the camshaft & lifters are.


I have pictures, but will post them later. Basically, there are two throttle controls on my machine. One near the air cleaner, and another on the side of the block. The one on the block is defined as the "auxiliary". It is defininately diesel that is leaking from the aux., not oil. The oil actually goes in at the bottom of the injector pump housing on mine.

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16 years 8 months ago #10815 by SJ
Replied by SJ on topic Fuel Leak
What I see on a D4 parts book here is the earlier injection housing casting has a plug & a seal behind it back where the gov. bolts on & is just below the rack bar & if I remember how it was is the main fuel tube from the filter housing back to feed the inj. pumps & this is the other end of the tube. It shows on the later D4 that the housing is a solid casting so couldn,t leak. So I,m wondering if your D6 is this type like the early D4 U models. You will have to remove the gov. to check it out & change it.Your Gov. is as I said lubricated with oil from the bottom of the inj. housing.Take that fill plug out & if it,s that plug leaking behind the gov. then it should be full of fuel down in the bottom of the inj. housing too. This is a new one to me causing this trouble but with old tractors the fuel can cause the seal to get hard & possibly it eat away. Let us know what you find.Was thinking too that it might be smart to remove the whole inj. housing and replace that front seal up at the filter housing which is the inlet for the fuel to the inj. housing then you will be sure of things.

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16 years 8 months ago #10819 by jshbryan
Replied by jshbryan on topic Fuel Leak

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16 years 8 months ago #10820 by ccjersey
Replied by ccjersey on topic Fuel Leak
What about a clogged or crimped fuel drain line 4F7734off the injection pump? If a pump or two are leaking significant amounts of fuel and it can't drain out, it may go into the governor along the rack bar. removing the inspection cover on the side of the pump housing should show that this space is filled with fuel.

If this is not the case, there is a seal, plug, lock and nut to hold it all that may be the seal SJ is referring to that blocks the end of the fuel delivery gallery for the injection pump housing. If the seal there 8B4967 isn't tight any more the transfer pump may be pushing fuel directly into the governor housing. The governor housing will have to be removed to access the nut that holds that all in the back of the fuel injection pump housing.

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:D

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16 years 8 months ago #10824 by Old Magnet
Replied by Old Magnet on topic Fuel Leak
Not uncommon to have that governor control shaft seal leak and can be a tough one to stop but the usual leakage is oil from the fuel injection pump housing which is also common to the governor housing.

If it really is fuel I can only think of two sources. One being the plug at the back of the fuel inj. pump housing at the end of the fuel supply chamber as SJ mentions. The other is past the pump lifters in the Fuel Inj. housing due to a leaking injector pump and a clogged housing drain line.

Check the oil fill level by removing the plug to the left of your picture. Normal height is level with the top. If over full (maybe with fuel) pull the side cover plate off the inject pump housing and check to see if drain is working.

If you find considerable fuel in the normal oil sump you run the risk of damage to the lifters, camshaft and bearings if you continue to operate.

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16 years 8 months ago #10826 by jshbryan
Replied by jshbryan on topic Fuel Leak
Here is what has me so thrown off. It is definately leaking more than ever and now when sittting over night, it near impossible to start. I use eather to get it started and keep it running until it runs on it's own. I think it is loosing pressure from the leak which makes it hard to start.

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16 years 8 months ago #10828 by ccjersey
Replied by ccjersey on topic Fuel Leak
Sounds more like the seal (probably an o-ring) on the plug in the end of the fuel gallery.

A worn leaky pump would have to be pretty badly worn for it to let air into the fuel gallery. In any case, drain the fuel injection pump housing and get some good oil in there before you damage anything.

An uncle had an old Mercedes car that leaked diesel into the injection pump cam/sump and he ran it like that for quite a while without problems, but it can't be good.

You should have a priming pump on an electric start dozer, so open a bleed on the top of the pump housing, (look behind each pump for a small bleed screw) and pump it until all the air is out, BEFORE you ever crank the engine over. You could also have leaks on the filter tower etc that allow it to leak down while it isn't running, but since it is leaking into the governor, that's probably the one that's causing all the trouble.

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:D

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16 years 8 months ago #10849 by jshbryan
Replied by jshbryan on topic Fuel Leak

Sounds more like the seal (probably an o-ring) on the plug in the end of the fuel gallery.

A worn leaky pump would have to be pretty badly worn for it to let air into the fuel gallery. In any case, drain the fuel injection pump housing and get some good oil in there before you damage anything.

An uncle had an old Mercedes car that leaked diesel into the injection pump cam/sump and he ran it like that for quite a while without problems, but it can't be good.

You should have a priming pump on an electric start dozer, so open a bleed on the top of the pump housing, (look behind each pump for a small bleed screw) and pump it until all the air is out, BEFORE you ever crank the engine over. You could also have leaks on the filter tower etc that allow it to leak down while it isn't running, but since it is leaking into the governor, that's probably the one that's causing all the trouble.


Does anyone have an exploded view of all of this so I can better understand where/what is leaking?

Thanks

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