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The Power Torque 270 and Formula 290 were/are real strong runners in the small cam family. You might have air entering your fuel feed...try running the engine from a fuel can right into the PT pump and see if your white smoke issue goes away. Regards, Bob

I think that data plate had the wrecker body serial number and date of man. stamped into it. Regards, Bob

These are very good configurations for the water plumbing when in tact (undisturbed), most diesel engine builders do use this type water/coolant connections. Make sure that you use small diameter wire wheel brush in the tube bores with either a drill or die grinder, and make sure that you wire...

What might have happened is that the fuel tank had been overfilled at some point and the fuel got "vacuumed" into the transfer case and subsequently (after overfilling the t-case will diesel) was "vacuumed" into the air filter housing via the vent circuit. Remove the t-case fill level check...

In the early 80's men at AM General got paid good money and good benefits to build thousands of the M939 series trucks. I personally think they did a great job, and no other company since could possibly do as good of a job "re-building" the original truck. Regards, Bob

JH1, Absolutely... most of the time you would not consider this failure on an ex-military truck because of the inherent lack of miles or wear. On a commercial civilian class 8 truck with a half a million plus miles on it I would be looking for the contact of normally isolated suspension...

It sounds like your steer axle rear main leaf eye (driver or pass. side) is hitting the lower frame flange. Regards, Bob

Wheelspinner, With respect to your upper torque-rod (TR) bushing pre-load question, imagine that you have put your trunion axle on jack stands high enough for all your rear tires to be 12-18" off the floor and you could oscillate the axles (if you were strong enough) completely through their...

Rifleman I would say to have the top end run on the motor if it will give you a warm fuzzy. I would submit to you that valve lash and injector adjustment will only fall out of adjustment do to wear (if initially set to specs of course). An engine can set idle for decades and will have no...

Most engines are good for a couple of hundred thousand miles between top end adjustments...where do you think you fit in there? Regards, Bob

Remove the fill/level plug on the transfer case and see if it is overfilled (with fuel contaminated gear oil)...this condition along with oily residue in the filter housing is the result of over filling the fuel tanks, allowing fuel to enter the air venting circuit (because of engine vacuum I...

WARNING: Bad Torque Rod EndsALERT: to all M39, M809 and M939 series 5 Ton truck owners, I purchased six aftermarket 5 Ton Torque Rod Ends from eBay seller wolfer-parts in early September for my torque end replacement project. They were sold as new, unused parts per the seller's listing. They...

Wow! Almost 30 posts to this thread and it is just as convoluted since the first. Regards, Bob

Good point on checking the air filter for restriction, I have chased my tail on a low boost condition before to find out that the operator only changed the outer filter element and not the inner in many years. As far as the boost equating to the horsepower...fits right in with the which came...

My guess is that the bridge truck torque rods are one inch longer than other models. You can replace the upper torque rods on the M936 without removing the load beams...just make sure you read the TM and get the bushing pre-load in the right ballpark (been there and done that). Regards, Bob

Ken, Are you running an air dryer? At what pressure do you hear the relief occur? Where is the relief happening at, at the governor, pressure relief valve? If your governor is not sending the cutout/unload signal to the air compressor, then you would be hearing a relief valve blowing off which...

If there are any angles or deviation in the driveline, and the "shaft" yokes are out of phase, the cross/u-joints will bind with respect to driveline angles regardless if it's a propeller or PTO shaft. If there is "no" angle in the driveline, then crosses and yokes are not necessary and a...

The oxy/acetylene torch with rosebud and 5 pound hammer are about the only special tools you should need. Regards, Bob

That is a very good point. However, given the choice to wash the motor out with $10/gallon oil versus $14/gallon, my money goes to the cheaper of the two every time. Of all the engines that I have done teardown analysis on to determine failure (many that have burned a quarter of a million...

These 30 year old motors aren't too particular on the brand, just grade. A lot of people don't take into account that there are only so many refineries in this country (and the oil companies would just as soon keep it that way), the big brand companies have proprietary rights on certain...