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Probably stupid questions. When my M925A2 is at temperature, I see blowby coming out of the blowby tube. It is a light grey color. It is not puffing like a steam engine but it is puffing more than I would like to see. I can put my thumb on the tube and hold it and it does pressurize and when...

I tried the search button, but it seems less than helpful lately. I disconnected my M322 trailer when I had a massive bulge in my tire to have the spare put on. When I went to go put the trailer back on and prior to hooking to the trailer my parking brakes will not release at all. I have to...

I spend many nights sleeping in the truck while in the field. Let's be honest, when it comes to certain things.....I am cheap. Like hotel rooms for example. I am already dirty, smell like diesel fuel and I am just going to get dirty again the next day. Plus, I have to drive to the hotel...

I had LED taillights on the M322 and they over time went out little by little so I swapped to standard tail lights. The lights worked fine for a while then I had no brake lights. Everything else would work. I installed 2 new tail lights on the trailer and now everything works except when you...

My truck was running hot due to a bad thermostat. I ordered the correct part and picked it up directly from Cummins, changed the water pump, flushed the radiator and motor, and have the proper coolant and additive package. I also replaced the shutterstat. Both the shutterstat and thermostat...

I wanted your guy's opinions on tire brand preferences. My Goodyear 14.00R20 tires are getting pretty low on tread after nearly 60,000 miles on them. They have been pretty good with no major complaints. I won't go down to the 395's due to the loss of top speed, and yes I know I will lose a...

I had the rear main seal on my M925A2 replaced. It was BAD. The mechanic that dismantled the truck to replace the seal wound up sick and was off for an extended amount of time and a different mechanic finished the repair. I understand it sucks putting something back together that you did not...

Does anyone have a larger fuel tank for an M923 that will fit in the stock tank location? I am in the market. If not, can anyone point me in the right direction of what I would need and who would have one? The 81-gallon tank is not big enough for some of my one-way hauls. I carry more fuel...

My M925A2 is running about 20-30 degrees too warm. Engine temperature is running between 220-230 degrees and Trans temp holds steady at 225. I confirmed the gauge with an IR Temp gun. Upper Radiator hose is down to 195. The fan is working and comes on at 185 degrees and operates normally. Truck...

I was going down the road and thought I smelled brakes. I pulled over to check. All 4 rear brakes are dragging to the point of smoking. Stuck on the side of the road to let them cool. I pushed in the override button but not sure if it is helping. What would cause them to all of a sudden stop...

I have an oil leak and it is coming from the open hole at the rear of the oil pan. It is a threaded hole. Am I missing a plug? Is this a vent hole? And last but not least could I have a rear main seal leak? Thanks guys!

My M322 trailer is starting to leak slightly around the axle flange gaskets. I figure it is time to re-pack the bearings. Does anyone know the part number for the gaskets and would Napa have them? It is a Terex trailer so I thought that they might. Thanks

I am getting the itch to buy a M931A2. Does anyone know the towing specs on this truck and will civilian trailers mate up with it? I need a lowboy 40 foot trailer behind it. Thanks guys.

I am getting ready to install the pyro and boost gauges on my M925A2. I want to get some baseline numbers before turning it up a tad. My question is this. What is the actual top safe speed for these trucks mechanically. Yes, I know it says 63 MPH on the yellow sign. I am not wanting 128 MPH...

I have looked in the TM. I see the electrical diagrams but it doesn't show what I need. I have the new battery "top" switch on my M925a2. 2 of my wires are labeled 81A and 459. The plug is labeled A-D. Does anyone know what wire goes into what plug on the switch? The wire from the batteries...

I did an oil change today and my semi sized oil filter wrench ever so slightly cut through the insulation on the wires underneath the oil filter causing a spark storm. I taped up the cut in the insulation with electrical tape and went on to deal with a spring brake bladder replacement and wheel...

Quick question, I have a dragging brake on the passenger side, center tire. I am 65 miles from my shop. Can I cage that brake only and limp it back? I have the brake bladder at the shop, I just want to know if it is feasible to cage that brake only until I get back to replace it. Thank you

Has anyone had their brake lights staying on constantly? I have turn signals and flashers but my actual stop lamps stay on as if I was pressing on the brakes so no one behind me knows I am braking. It looks like tail lamps to them. The only way to turn them off is to move the 3 position light...

Has anyone installed a "house" battery on an M939? I currently have dropped down to two group 31 batteries to start the engine and have a 24 volt to 12 volt 40 amp step down that runs to my cigarette lighter plugs. I am not having an issue but I would like to wire in a 1,000 watt inverter and...

So, hopefully in about 2 months I will send my truck in to have it professionally turned up. I am just not brave enough to do it. I have a mowing contract in Terre Haute Indiana and will drop it off at Scheid Diesel and have them do it along with changing the timing to 16 degrees and...