-
Steel Soldiers now has a few new forums, read more about it at: New Munitions Forums!
Seeking Advice on Replacing HH O-Rings in the Truck
- Thread starter GunInstructordotcom
- Start date
GunInstructordotcom
Active member
- 97
- 112
- 33
- Location
- Castella, California
That makes sense. When I get it buttoned back up I will do that, just to be safe, before i start it. Thank you for the tip.
- 572
- 648
- 93
- Location
- East Central Oklahoma
Also, look on the back side of the air filter housing toward the engine. There's probably a 1" port there that might have to be plugged, or else the board over the intake won't completely kill the engine.
GunInstructordotcom
Active member
- 97
- 112
- 33
- Location
- Castella, California
It started up after a bit of cranking and letting the tank pump fill the low pressure lines. Runs a bit rough, but idles. Forgot to tighten down injector line #5, spitted a bit of diesel. Then while it warmed up, I noticed it was leaking from the base of the HH. This was where it was leaking before I replaced the o-rings.
I should mention that, when I first removed the injector lines, two of the HH ports had rusty sludge in them. They happened to be the two lines that had cracked rubber water covers. When I cleaned out those ports in the HH with q-tips, there was much red rust sludge in the bottom of those two ports. The fittings on the two lines were also rusty between the hex head and the threads. I'm wondering if the HH is malfunctioning. Perhaps the two lines are clogged? Could that explain the leak at the base, the weak, rough acceleration and the smoky exhaust?
- 572
- 648
- 93
- Location
- East Central Oklahoma
With the rubber covers bad, I'm not surprised there was crud in the threads. I doubt the lines or ports are clogged, but it's easy enough to find out. You can loosen the lines one at a time at the injector and start the engine and see if they spray diesel.
GunInstructordotcom
Active member
- 97
- 112
- 33
- Location
- Castella, California
The rust muck was all the way down in the hole in the HH that the line screws into. Tomorrow morning I will try to verify where the leak is coming from while it is running. Is leaking diesel from the HH base a possible symptom of a cracked HH?
- 572
- 648
- 93
- Location
- East Central Oklahoma
I haven't had to do any major work on my HH, so I don't know enough about the inner workings to be much help in that area. Hopefully someone with more experience with the HH will chime in on that.
A couple years ago I did the same thing you just did and replaced my HH O-rings because I was getting diesel in the oil. The process went okay and the engine ran fine afterwards. I haven't had to mess with the IP or HH other than that.
A couple years ago I did the same thing you just did and replaced my HH O-rings because I was getting diesel in the oil. The process went okay and the engine ran fine afterwards. I haven't had to mess with the IP or HH other than that.
Did the engine run good before you worked on the HH?
If the mating surface between the line and the head has any defect or crap there, you are going to have a leak. Considering the pressure, the slightest defect and the fuel will push by or through it. Also When you started it back up you could of push the sludge through the line up to injector. Maybe its time to pull injectors and check pop-off pressure, spray pattern and clean the tips. When you had it apart did you spray anything or blow air through all the injector lines to check they were clean and clear before reinstalling? If you can post some pics of the area that would help.
Elk1111
Well-known member
- 281
- 487
- 63
- Location
- Las Cruces NM
I’m not sure if it’s the best idea or not but on mine I ended up putting orings in each injection line connection to fix the same problem your having. My hydraulic head was old and pitted and that’s the only way I could keep it from leaking.
GunInstructordotcom
Active member
- 97
- 112
- 33
- Location
- Castella, California
Yes, it ran more smoothly. It did smoke until it warmed up. Later today when there is shade, I'm going to try to determine where the diesel leak is coming from. I will shield the area from the fan so I can see better where the tiny stream is coming from. The fan blows it onto the steering shaft.
GunInstructordotcom
Active member
- 97
- 112
- 33
- Location
- Castella, California
It occurred to me that I have not replaced the primary and secondary fuel filters in many years. So I'm going to tackle that task before I start it up again and try to determine where the leak is coming from near the HH. I noticed in the military manual that there is a bleeding process for the filters that includes loosening the injector lines at the injectors until no more air escapes. I didn't do that after replacing the HH o-rings. I hope I didn't screw something up by not bleeding them.
GunInstructordotcom
Active member
- 97
- 112
- 33
- Location
- Castella, California
I have never changed out the fuel filters. In the past, a mechanic did it for me. The military manual states that the first step is to drain the filter through the petcock. I did so, but shut it off after much more came out than what I believe the filter can hold. Does the draining also empty the fuel lines back to the tank and forward to the secondary filters? Or am I missing a detail such as a shutoff valve for the fuel line?
- 572
- 648
- 93
- Location
- East Central Oklahoma
No, you didn't hurt anything.
There's no shutoff valve.
If you're draining the primary filter on the frame rail first, there's a chance it could siphon fuel from the tank.
I don't remember the exact procedure in the manual, but I think if you drained the two filters on the block first, left the drain valves open so it can draw air, then drained the primary, it wouldn't be able to siphon from the tank.
If you collect the drained fuel into clean containers, you can let it set for awhile so any water and junk settles to the bottom, then pour the clean fuel off the top back into the tank so not much is wasted.
GunInstructordotcom
Active member
- 97
- 112
- 33
- Location
- Castella, California
I'll try draining the secondaries first and leaving the petcocks open. Thanks for the advice.
GunInstructordotcom
Active member
- 97
- 112
- 33
- Location
- Castella, California
OK, so I changed the secondary fuel filters. The old o-ring gaskets were tough to get out. I suspect the mechanic who last replaced the filters just reused the old gaskets. They were hard and brittle and took about an hour or more for my wife and I taking turns to get them out with the help pf a dental tool. I used the thinner set of new gaskets that came with the NAPA filters. The thicker set does not fit. I had to stretch them out a bit to get them to fit in the grooves. Installed the filters and housings. I just switched the ignition on and when the pressure filled the filters, they both leak a bunch. Is there another set of gaskets I can obtain that will work?
- 558
- 844
- 93
- Location
- Riverhead, NY
I have a leak at one injection line only. Tried a lot of things to fix it to no avail. I would like to know more about your fix and how you did it.
Jeepsinker
Well-known member
- 5,399
- 456
- 83
- Location
- Dry Creek, Louisiana
This may help.
www.youtube.com
Multifuel injector pump videos
Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.
www.youtube.com
Jeepsinker
Well-known member
- 5,399
- 456
- 83
- Location
- Dry Creek, Louisiana
Oh, here's another.
www.youtube.com
M35A2 fuel system
Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.
www.youtube.com
- 558
- 844
- 93
- Location
- Riverhead, NY
Thanks Jeepsinker all good information there in those links.
It's to the point now where I think I have to pull the head just to try and fix where the #3 injection line goes in. Tried new lines, new crush ferrules. Tried lapping the tapered part inside the head. O-Ring idea sounds like it might be what I need.
Not sure what else to try. This is a very annoying leak that doesn't show up at an idle. Only when you are running on the road.
Hate to buy a whole head for a leak on one line only.
It's to the point now where I think I have to pull the head just to try and fix where the #3 injection line goes in. Tried new lines, new crush ferrules. Tried lapping the tapered part inside the head. O-Ring idea sounds like it might be what I need.
Not sure what else to try. This is a very annoying leak that doesn't show up at an idle. Only when you are running on the road.
Hate to buy a whole head for a leak on one line only.