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new guy with an old Ford 3910, and some issues

M

mouthfulloflake

New User
Hey guys.

I think its a 1984 3910, was starting and running pretty well.
Noticed diesel dripping from the injector pump.

searched and read about re-sealing the pump, ordered the kit.
checked the oil, level is HIGH and smells like fuel.

what seal do I need to replace to stop the fuel from leaking into the engine oil? is it the head seal or possibly the head itself is bad?

what are my options for sending the pump to someone for a rebuild?

This post was edited by mouthfulloflake on 07/06/2021 at 11:11 am.
 
Send the pump to someone for a rebuild. They are a specialised piece of equipment and you need a super clean workshop to do this properly. There are two pump repair guys that often post here, you can look them up and send them an email.
 
well, I changed the oil yesterday, and its not nearly as bad as I initially thought.
so for now I will run it for a while and see how much fuel is actually making it into the sump.
 
And get ready to fork out $650 for the OH. Check with Al Baker, the pump man, or Diesel Tech, both of whom post on these
forums. Surely they can do the pump for you...if not I had Southern Valley Diesel, LLC in Kansas that did a pump for me.
 
I can not imagine why it would need an overhaul.
the tractor ran great before I ran it out of fuel, Ive bled it twice this morning, and it started once for about 4 seconds, and thats it.

its dripping fuel from under the CAV pump, I sprayed degreaser down there and rinsed going to try and figure out what exactly is leaking.

I think I have two issues
1: something is leaking and letting air into the lines
2: the starter drive is sticky and barely spins the engine over before releasing the flywheel.

starter drive gear should be at PO box, Ill probably ride to town and get it.
the last time it did this, I had to roll start it in high gear, that spun the engine enough that it pushed the air out and got fuel to the injectors.
the problem now is, its not in a spot to roll and FEL and blade are both on the ground, so I can not do that.
I guess I am tearing into a starter today

the tractor was free came with the property
so having to put $650 into it ( when it was running perfectly before) would likely chap my hide enough that the tractor would sit as is until someone wants it.
 
I think this tractor has 2 issues

1: its leaking from the injector pump,I cant tell where, but its likely introducing air

2: the starter is malfunctioning, it will only spin the engine over once or twice and then it comes off of the ring gear and free spins.

ive degreased the area to try and narrow down the leak
and a starter drive should be at the PO box, so I might roll to town and grab that and tear into the starter today.

Ive learned a lesson about parking the tractor in the darkest area of the pole barn, its darn tough to work on in there.
 
Wow what a bear to remove the starter
got new drive on, but stretched the retaining ring, and no parts places open within reasonable distance. I just ordered another starter, will fix this one for a spare.

removed fuel filter to easier access sstarter, its full of rust and mud.

might have been a #3 issue ive found so far.
 

Most time that fuel leaking from the bottom is running down from the top, the top cover gasket is known to leak on those pump as they age.
The one on my 4000 started leaking pretty bad

mvphoto78337.jpg


The top cover gasket had broke and slipped out

mvphoto78338.jpg


It's not a hard fix but everything must be keep clean and there'a a spring under the cover that you need to disconnect, that spring must be reconnected back in the same holes it came from
 
Yes I bought the kit, and watched numerous videos about it.
I will probably remove the pump to do the cover reseal.

My attempt was to get the tractor running to move it out into the sun so I could
see, and also degrease the area better than trying to toss a bucket of water through
the FEL arms.

If I could get it running Id lift the bucket up high and make it a way easier job.

thanks for the tip though it would make sense that it is likely leaking from up top
and dripping around and down.
 

Get the starter working and see if you can get it running, it may need a light shot of starting fluid.
Once running you can move it to a better area and get the loader raised and blocked for better access.
To remove the pump you'll need to drain the coolant and remove the bottom radiator hose for better access to the plate covering the pump gear.
I hate working on tractors with loaders, that's why all of my loaders are quick attach so I can easily remove them.
 
If I could get it running Id lift the bucket up high and make it a way easier job.
Click to expand...

You should think about blocking between the face of the cylinder gland and rod end when the bucket is up. Makes it a lot safer when you're working under a raised loader frame.
 
Problem #2 go after a weak battery, low charge, contaminated connections. Your first couple of starts drains enough energy out of the battery that (due to one or more of the above mentioned) it can't spin the bendix fast enough to engage. The gear spins up the starters shaft, but doesn't lock into the ring gear......I'd solve that problem before i did a split to replace a ring gear that may not need it...nor buy a new starter Bendix.
 

Bad connection could be a issue but the diesel starter solenoid forces the starter drive gear into the flywheel before it makes contact to energize the starter motor
If the starter spins without cranking the engine over the bendix is bad
 
New starter fixed the starting issue, and made it way easier to bleed.

Fuel leak got worse, and it was contaminating the oil too

so injector pump is removed, I have a question.

can I use an impact driver to remove the hex nut in the front that holds the drive gear on?
 
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