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Maybe there are check valves along the lines. Disconnect your axle breather lines and install some temporary ones run up high. Is your ctis disconnected? I will ask one of the mechs I know about it.
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Good ideas. I have done a test that, I think, rules out clogged piping. I installed a pressure gauge in the fill port of the front diff then drove around for several days. I would cycle the tires from HWY to XC to SAND and back and the CTIS worked as it should. No pressure ever showed up in the diff.Ok went thru the manuals again with one of the mechs. Axle vents appear to go into the ctis quick release system. If you have a clogged release valve maybe ctis air is making its way into the axle. A way to test this is to take out the top plug on the diff and air up the ctis then dump air and see if air is coming out of the plug hole. There are issues with the u-joints if there is more than .025" of end play then damage can occur or you can just throw a driveshaft or two. Wobbling driveshaft can prematurely wear pinion bearing and seal.
Do you have any pictures or video of your rescues?We have been using our LMTV to assist in water rescues here in MO but I was curious on what the military manual says on deep water fording in the LMTV. I have been all through the TM's and not much is mentioned except testing fan clutch switch. Anyone got any experience in using the LMTV in deep water? Deep is relative but so far we have kept it above the fan. With the fan clutch on should i see the fan stop moving? Thanks for the info, trying to set some limits on usage.
Old thread and all, but for you overland junkies who like to push vehicle capabilities this fan kill switch should also be used when torquing the frame left to right.It will spin a bit but should not be running. It's loud when running you can't mistake it. The assembly spinning with the fan off will cause the fan to spin a bit.
Wow, the frame twists that much?Old thread and all, but for you overland junkies who like to push vehicle capabilities this fan kill switch should also be used when torquing the frame left to right.
Or said another way:
When I used to deliver logging and firefighting equipment in MT/ID/WA/WY sometimes you'd have to intentionally dig one of your trucks steer tires into the outside of a corner/turn where the outside was the high/uphill side of a mountain road, and the inside was a cliff.
This would twist the frame a little, especially with heavy loads, and if you forgot to shut off your fan clutch first your fan would eat the aluminum out of the back of the radiator.
The operator "tell" (sound wise) for when you forgot the fan kill switch was: all of a sudden it sounded like someone was running a table saw/wood groove-er on the front of your truck.
Same with intentionally hopping onto curbs with a heavy haul truck in situations where you either use some sidewalk or take out a traffic light.
In extreme conditions like adventure-style offroading in the mountains, where one suspension is against the bump stop and the suspension on the other side is bearing little to no weight, it might, yah...i'm honestly curious to see if it does or not...but i won't be taking the chance since the switch is right there, and it's practically force of habit.Wow, the frame twists that much?
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Yeah there is a LOT of spare room under the hood, so you're probably right, my head was up my fourth point of contact when talking about the fan's first point of contact.There is quite a bit of space between fan and rad on these. I think the first place to contact on a lmtv, if at all would be fan to shroud...