First 5 ton (Marine) and have some issues...

[TacticalDoc]

5 ton Axle Trans and transfer case vent bypass

EDIT...I updated this post so others can avoid the problems I had



I just picked up a Marine 5 ton (M923-A1) with lockers, fording kit and PTO/hydraulics. This is my first 5 ton but I had a deuce in the past. As I drove it home the driver side middle axle seal started leaking badly. The guy I purchased it from said he worked on that wheel when he ruined the tire. Now there is no spare tire and a good tire in its place. I'm assuming he messed something up since its only that seal. I'm not sure why he messed with the seal to change the tire but I'm not familiar with the mechanics of it.

In addition, I found 2 other leaks. one from the air filter which is oil. The oil doesn't touch the air filter and has a small layer at the bottom of the air filter. It leaks from the center air filter case.

the third leak is from the high/low shifter to the transfer case. where it inserts to the transfer case. this is a small leak and the fluid level doesn't seem to be low. it's most likely the small seal there. I think for now I'll just watch the fluid levels.

I'm thinking that the water fording kit might have something to do with these leaks but don't know much about it. The prior owner told me that he shut the fording kit off. It starts and runs well but I want to resolve these issues. Any suggestions?

 

[Suprman]

If you open the hood and stand on the passenger front tire looking at the top of the engine the fording pull cable comes out to the top of the engine and there are 2 valves that it opens for operation. I believe it puts a light pressure to the axles and other fluid resevoirs and anything that water can easily get into. I have seen a little oil in the bottom of air filter housings there are a few threads discussing it. If the air filter assembly is not air tight going fording will ruin your day it will suck in water. If oil can leak out then water can get in. I believe there is also a thread with part numbers for the axle seals I have seen them on the bay for sale before though they are not expensive but I believe its a bit of work to change them.

 

[TacticalDoc]

If you open the hood and stand on the passenger front tire looking at the top of the engine the fording pull cable comes out to the top of the engine and there are 2 valves that it opens for operation. I believe it puts a light pressure to the axles and other fluid resevoirs and anything that water can easily get into. I have seen a little oil in the bottom of air filter housings there are a few threads discussing it. If the air filter assembly is not air tight going fording will ruin your day it will suck in water. If oil can leak out then water can get in. I believe there is also a thread with part numbers for the axle seals I have seen them on the bay for sale before though they are not expensive but I believe its a bit of work to change them.

the fording kit is off but oil still collects at the bottom of the Air filter canister then leaks out. I'm not sure where its coming from but it's not coming from the motor. The inside of the filter doesn't have oil coming out of it. oil is on the outer side. oil never touches the filter

 

[Suprman]

If oil can leak out then water can get in so don't go fording with it. There is an o ring seal on the air filter housing. Maybe the fording valves are not fully closed or leaky and somehow the suction from the air filter housing is sucking a little oil thru one of the fording vent/pressure lines from somewhere. The truck uses motor oil for just about everything except coolant.

 

[TacticalDoc]

If oil can leak out then water can get in so don't go fording with it. There is an o ring seal on the air filter housing. Maybe the fording valves are not fully closed or leaky and somehow the suction from the air filter housing is sucking a little oil thru one of the fording vent/pressure lines from somewhere. The truck uses motor oil for just about everything except coolant.

I don't plan on fording with it. especially with this problem
maybe I'll plug up the fording kit...if I knew how

 

[Suprman]

Take off the pull wire from the 2 valves and see if they will go farther closed if so zip tie them in place. Give it a few days and see if oil is still accumulating in the air cleaner housing.

 

[pctrans]

I was having some valve/oil issues with mine. I plugged off the air supply, and have had no problems since then.

 

[TacticalDoc]

Take off the pull wire from the 2 valves and see if they will go farther closed if so zip tie them in place. Give it a few days and see if oil is still accumulating in the air cleaner housing.

I didn't pull the wire but they are zip tied
maybe I'll pull the wire and see if it can go further closed

 

[TacticalDoc]

I was having some valve/oil issues with mine. I plugged off the air supply, and have had no problems since then.

how and where did you plug your fording kit? where the hose enters the air supply?

 

[TacticalDoc]

I don't think this has anything to do with it but the air filter meter bottom is broken off. meter still reads in the green

 

[TacticalDoc]

after doing more research I figured that it could be from the transfer case being to full then leaking into the air filter box. I heard that if you over fill the gas tank diesel will overflow into the transfer case making it leak into the air filter box.

 

[jarhead1086]

I just rebuilt two of my rear hubs. I replaced the multi piece inner seal with the old style can seal. The single pc install into the hub where the newer multi pc ones install on the axle. They were leaking because they weren't put on square to the shoulder and the high spots got hot enough to melt the seal. The outer seal leaked 90 weight in to wash out the bearing grease. I used a 4 wheeler lift to the support the brake drum and a 2x4 under the hub so it could be slid off staying horizontal. Don't forget to cage the brake. I did my Deuce hub by hand but wasn't going to try this one by hand. Not a bad job at all with the 4 wheeler lift. I should post a pic when I load it on this computer. The axle nuts were supposed to be torqued to 250 - 450 ft lbs and mine came off by hand. Scarey thinking about it. I feel much better knowing they are fresh and properly torqued.

I won't overfill my gas tank again.

 

[Rifleman]

I read a thread here that some of the trucks that were headed to the sand box had oil added to the air cleaner housing to aid with all the fine dust. Have you cleaned out all the oil from the air cleaner housing to see if it comes back after you have run it for awhile. Now if you do clean it and it doesn't come back maybe it was one of the trucks that they added the oil to in prep to go overseas.

 

[TacticalDoc]

I read a thread here that some of the trucks that were headed to the sand box had oil added to the air cleaner housing to aid with all the fine dust. Have you cleaned out all the oil from the air cleaner housing to see if it comes back after you have run it for awhile. Now if you do clean it and it doesn't come back maybe it was one of the trucks that they added the oil to in prep to go overseas.

its not oil added to the filter. the filter looks clean and in new condition

 

[TacticalDoc]

one other thought about the over flow of oil into the air box tat no one stated.

The pressure valves on the transfer case and transmission can be blocked. These are the same ones on the axles (axle vents) which get clogged up often leading to hub seal leaks. So, I will make a tubing system to vent all the pressure valves from the axles, T case and transmission. The tubing will go up the back of the cab and vent just under the mushroom cap of the air intake

 

[TacticalDoc]

Just an update...

I have oil leaking in to my air box and was told that it might be do to someone over filling the gas tank or over filling the trans or the fording kit being on. I think it is the over pressure from the trans or transfer case because of clogged vents. So, 4 things can cause oil to appear into the air box

1. over filling of the gas tank
2. pressure from the trans/transfer case due to clogged vents
3. pressure from the trans/transfer case due to over filling it...if it was this you would think it would stop after it drained out a little
4. fording kit is on

So, Now my plan is to run a tube from anything that has little vents sticking out of them.

The axle vent threads are for 3/8 not 1/4 as others have stated on other posts. I just removed all 3 axle vents and replaced them with 3/8 copper elbows with 1/4 fuel rated tubing. 2 of the 3 axles had pressure build up. The one that didn't had a recent seal change and not much mileage on it. Next I'm going to vent the trans and transfer case if I can find the vents.

I will run the 3 connecting tubes for the axles to one line. A second line will be for the trans and transfer case. These two lines will then travel up the cab to the air intake and secured there. I think all trucks with these vents should have this done.

Does anyone know if the T case and trans have these little vents and where they are?
Or, do they just vent into the gas tank?