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From researching this on the interwebs, the 15.5/80r20 tire was only used on the PLS M1076 trailer. Maybe it also was on the PLS M1074 and M1075 trucks early on but it seems like those trucks migrated to 16.00r20s now. The question is what are the wheels that came with the 15.50s? They look...

Glad you found the owner. As another M923 owner, I’m curious as to what part could have fallen off the truck and caused serious damage later. ​

I can’t really offer any help from Texas, but a pic or description of the part may help better track this down on your side.

Thanks Will. I've read most of your posts about adjusting the valves and injectors and appreciate the info. It really helps me comprehend the mechanics of what's happening when the pieces and parts are whirling around together turning fuel into noise and motion. I also remember one of your...

Thanks for the continuing write-ups. Looking forward to the pics.

:goodjob: I'm jealous and can't wait to get my own heavy duty vice. Just hope the truck attached to it is in decent shape.

I don't have a knock in my M923. I'm only trying to understand how a bad injector can cause knocking as it's prevalent in a lot of posts in this forum. I just can't understand the mechanics of it so it led me to ask the question. Now, my non-running M925 will be a different story about knock...

I know bad injectors can cause a knock but I'm lost on physically what is going on to cause the knock. I've searched the forum and internet but haven't find a good answer. My understanding is engine knock is caused from pre-detonation of fuel that causes an abrupt increase in cylinder...

Thanks for all the replies. Once I got the truck home, I realized why it hasn’t started in a while- no need to hand turn it yet. I bought it as a parts truck so not too disappointed. Now have to figure out what caused the cam follower to crack out. No idea if this is minor or catastrophic.

I will head down to look at a non-running truck and want to turn the engine over by hand to verify it turns freely before I try to jump start it. No idea how long it's been sitting there without a crank so just being careful. What is the best method to do so and what tools do I need to drag...

Solid advice and from your signature it sounds like you're a subject matter expert in this field. #3 is the catch-22 issue. In a situation without ability to use a battery charger, it's either overload the alternator with the dead batteries still connected or deal with non-buffered alternator...

That's even happened on my 1-ton Ford Powerstroke with two just batteries. One started to fail and was causing odd starting issues. My pickup is a 12v system and the batteries are wired in parallel in order to provide regular 12v's but double the amps for starting. My understanding is the...

I forgot about the f-word. Not something I worry about too much down here. Follow on question: Does the regular heater like I have operate continuously so I can verify it's operation on warm days by feeling it? Or is operation based on outside temp?

Truck is a M925 (basic 5-ton cargo truck with winch) located in zip 78361 with delivery to 78223. Roughly 155 miles one-way. Truck reported to run fine then developed a knock, hence it being auctioned off. No idea what caused knock so truck may start via slave or jump but not confirmed. So...

First, thanks for the write-up Simp- great info. Second, I'm still learning about air brakes so how does a heater remove moisture from the air brake system? I thought to remove moisture from compressed air, you had to condense it out through cooling, not heating.

I've searched the forum and TM's but couldn't find a good answer. If a M939 has completely dead batts, I know we can slave start it, remove the slave cable, and the alternator will supply the voltage to keep the truck running while also charging the batteries. Back in my younger days when we...

That's part of my dilemma as there are a few equipment trailers with electric brakes. They not very common but when they come up at auction it's usually a good deal since air brakes are preferred. I didn't even think about trailer axle placement but I can see that pretty easily in all the...

Floridianson- I agree air brakes are the best for large heavy weights. And I would generally only use the M923 to pull a 'heavy' load and even then only a few miles from the equipment rental place to the ranch. I, nor my 5-ton, is at the level of Simp who could haul a FMTV from China if it...

I forgot to mention in my original post I don't have access to the truck so I can't just crawl underneath with a tape measure which is why I asked the question. I'm not THAT lazy.:whistle:

On a M939, the brake drum connects to the hub with same studs that hold the tire so you can't flip. A duece brake drum uses the same bolt pattern as axle connection to the hub so you can reverse the hubs. Rear hubs on M939, from the -24P, page 316, fig 315