Mj12687

The plate on the motor is a little tough to read but I believe thats what it says. I have the complete vin if that helps. Ill have to mess with the valve and see if I can get it cleared. The truck is a 12 speed 6 wheel short bed

It is a 275 hp cat motor. I changed that cheap fram filter on top of that separator and it made a big difference. I opened the valve after driving for a bit with the truck off and nothing came out at all nothing no fuel or water. With the two new filters them truck runs much better but I still feel its not running at 100%. According to the dash the truck has 320k on it. Also the tach cuts in and out would this cause a perfomance issue or is it strictly for the driver. Also when it would start to break up the engine warning light would come on is there a way to pull codes out of this truck.

No theres no wires going to it at all. I believe its some type of fuel filter or water separator but im unsure

Does anyone know what this fuel filter setup is and anyway to possibly clean it im getting a new filter for the top of it but im unsure of what to do with the setup.

It has a cat motor in it im not sure of the miles. I changed the oil and oil filter. I changed one of the fuel filters today the second will be here tomorrow. Changing the one fuel filter made no change I will hope for the best and change the second tomorrow but both appeared fairly new.

In neutral the truck will rev and idle properly. Start driving and about halfway through the gear it starts to breakup and wont rev any higher and you have to upshift to get the rpms down to continue accelerating but it has no power because you cant get into the power curve.

It could have been im not sure though they purchased the company and all the equipment last spring I believe.

Well here is the mack not the best pics I was running out of light but there will be more to come

I know this is a mack forum but you were all so helpful I thought id give it a try

Okay you guys were great with the earlier help let see about this. Its a 94 l9000 half way through any gear it starts to buck and lose power and blows some blueish smoke it feels like lose of boost but I cant seem to find any leaks and there is no boost pressure gauge in the truck.

That was my plan thanks for the help

Okay so I was able to locate fuel and oil filters is there any special procedure for changing the fuel filters priming steps or anything I should be aware of before I get involved

Okay so I was able to locate fuel and oil filters is there any special procedure for changing the fuel filters priming steps or anything I should be aware of before I get involved

Thank you for the info. hopefully monday or tuesday night ill have some pics and some more info on the truck. Thanks again for all the help and info right away

I believe it does I havent really spent more than 10 min with the truck this week I will have much more info and some pics. Do you know how many gallonsof oil the 300 requires for an oil change

The model # is dm686sx acording to the plate on the door. The one by the injection pump isnt really legible im hoping I can get it cleaned up a little and find the hp rating.

Sorry about the long sentence lol. I guess proper grammar isnt my strong suit. Thanks everyone for the quick and informative posts. The last six of the vin are 012842.

Hello all im a auto tech for a ford dealer I work on all cars and small diesel trucks. On the side I work for a banquet facility on there limos and miscellaneous other equip they recently purchased a paving company and want me to maintain equipment they have mack dm68es tri axle dump im wondering if anyone can give me some basic info engine size, what weight oil should it run, how much shoukd it take any paticular brand of filters that you recommend thanks in advance any help.would be greatly appreciated.