I recently picked up a 85 dually 2wheel drive 6.9 diesel. Noticed that the oil pressure was anything but pleasant with the factory gauge so I picked up a nice sport comp electric gauge with new sender. Well long story short it gave the same readings the factory one gave. Noticed the oil was watered down and over filled with what appeared to be fuel. Thinking that if I changed the oil and it brought the oil pressure up then maybe the mechanical fuel pump and a busted diaphram would be the culprit. So I changed the oil and the fuel pump. It brought the pressure up some but still nothing to really brag about considering that it should carry 40-50psi. On a cold start I'm lucky to hit 30 and after it warms up it will maybe carry 10. Noticed the other day I have an over filled oil with what appears to be fuel. I am planning on doing a compression check to see if the ings may be the problem but a buddy of mine mentioned that if the seals are bad on the injector pump it could possibly allow fuel to leak down into the oil being that it is incased and gear driven. could this be true? Just open for some suggestions here. I still need to do a compression check and I need to take the injectors out and have them all tested as well. But here is what I have. Fuel in the oil. Low oil pressure due to the fuel in the oil. Right bank smokes and does not clear up. Also though my oil cooler is leaking at the gasket so I don't know I that would cause it to lose pressure as well. Any help or information would def be appreciated.


Shawn

 

If fuel is going back around the Ip drive shaft, you should have a valley pan full of fuel.

There is a drain the the IP case on the bottom of the IP neck.

If you installed the new style lift pump with the almost straight arm, did you follow the directions about the cam lobe?

If not either lift pump or engine damage is very possible.

 

The lift pump that was installed had a bend in the arm and it isn't what I would consider to be almost straight nor was the pump that I took out. After installation of the pump I primed it and with the engine rotating it was putting out fuel that I was comfortable with along with my friend. It had like I said an over filled oil with fuel in it. So we changed and and replaced the pump jut in case the diphram could have been busted. That was last week. Now the same thing again. It puts out white smoke out of the passenger side exhaust. Not saying I didn't but the likelyhood of me not installing this lift pump correctly is slim. I think I have other issues going on. Either bad rings, injector pump, or a sticking injector. But the arm on the lift pump had a 45• bend in it and like I said I wouldn't even entertain the idea of it being straight.

 

Way back when my 85 only had about 120,000 miles, I was running an electric pump and started getting fuel in the oil and it was the IP, I was told by the pump shop that rebuilt it for me that they changed something so this could not happed again and the newer ones came from the factory with it already upgraded. I don't remember what it was though.

 

I have heard of a Stanadyne pump that had the drain hole plugged with crap. I couldn't hurt to check.

 

i have an old farmer down the road from me going to help me out and re-build my IC. i will have to do a compression check though and see what other kind of issues i am having. thank you all for the replies.

 

I don't know the farmer down the road, and I know some are good mechanics, But I have never known one to have a pump bench. I had a lot of farm and ranch customers that I had to charge double to fix things they had worked on. lol

 

The old style IPs sent fuel into the oil pan when the front fuel seal went out....... The new style drips it onto the valley pan from a hole underneath.

 

well thats very good information to know. thats what the old man said too. i know what you are saying starmilt, and i dont take no offense to it non. but everyone that i have talked too in these parts where i live have all said to go to him, that he re-builds them on tractors and have been known to rebuild them on these trucks as well. and if it wasnt for him re-building my buddies 6.9 IP i would have been hesitant as well.

but back on track, what PLC7.3 said, is what he said and would be the culprit of what i have going on. the real question is .....how long has it been like this and doing this. i have hardly driven it so hopefully the fuel in the oil issue is something new ( i doubt it ) and it hasnt wiped out the bottom end of the motor causing my oil pressure issue. i will keep updating though. he hasnt stopped past the house yet so i havent had the IP re-built yet.

 

Shawn,the farmer down the road sounds like he can rebuild the pump to working condition again.however,this wont mean it will be within the tolerances for max performance and fuel economy.
the tools to do this are very expensive and the skill involved is above the shade tree mechanic to do so as well.
with that said,if i had an older 80's truck i would opt to just get it working and call it good also unless i planned on keeping it around for a few years or 50k miles or more.
for example,you can buy an ip for 400 or so,or have your old one setup to moose specs by Mell which costs 800 or so.
so when you pay the farmer 75-100 or so,you may understand why the cost is so much lower.don't expect it to be like new is all im saying.this depends on the condition of the truck.if its just an old ford beater truck,likely id do the same.just in case your '85 is pristine and you know your going to drive it for more than a year or two,you may want to weigh your options more closely.

 

Your input will be taken to heart. I understand what your saying. I guess at the time I was just trying to weigh my options vs spending 400+ dollars for a refabed IP. My main concern right now is doing soemthing with thus IP before it wipes out the bottom end of the motor. Everything just kind of hits you all at once when it comes to repairs it seems. But all the input and posting really is appreciated. And I mean that sincerely. The problem that I have though is the care and attention that I give and show vs other people are alot different as I'm sure you can agree. I am almost positive though because the fuel was in the oil when I picked her up when purchased. Life lesson again I guess due to my lack of knowledge of diesels. I think I am going to have to source me a newer/ used 6.9 to be perfectly honest. The odo on my truck says 348xxx. And you can't believe what you hear and only half if what you see. So while the cosmetic condition of the truck was a big part on the reason for me buying there was really no way for me to tell the condition of the motor.

 

Me I'd go with the farmer down the road for now, and then keep an eye on the craigs list for a donor motor I could rebuild, and put fresh parts into taking my time.

that way the truck ain't down for any longer than the motor swap takes, and you don't wipe any good parts putting them on top of bad ones

 

One thing to note here, the 85 odometer only goes to 99,999.9 miles.

So it is reading 34,8xx.x miles.

Now the question is, how many times has it rolled over to 00,000.0 miles and started again.

Also take into consideration how many miles you intend to drive it a year.
With fuel prices on the rise, if you drive it a lot, you may save the cost of a professionally rebuilt pump in a rather short amount of time.
After you save the price of the rebuilt pump, it starts leaving money in your pocket instead of down at the fuel stop.

 

I bought this truck to serve one purpose and one purpose only. To pull my mud bogger mud truck. Season is from April to October. Outside of that I really don't plan on driving it other than keeping parts lubricated and to not just let it sit and fall apart. I think for the time being farmer down the road will just have to do until I can find me either a nice 7.3 or 6.9.

 

Just an update. Found a donor truck with a 6.9. Going Friday to try and start it and see if the motor would be a worthy swap. Whole truck which is a 86 250 for 400 bucks. This includes f/r axels ( 4x4 ) etc.