8.3 cummins

[SSwords]

Hey I am a full time mechanic for the army guard and I have a 936 A2 wrecker (for those in the army) and for those not it is a 5 ton 6x6 with a 8. 3 cummins in it and I have big problems 60mph down hill lucky 30mph at the top unloaded even worse loaded (this is a wrecker so it is draging something all the time) and I have been in the exact same style truck and it had no problem making it. This truck has a new motor ( someone blew a coolant hose and did not stop) so I know it is not the motor it does have a tiny fuel filter on it I and about to bypass it to see if it is to restrictive but I was wondering how to adjust the injector pump? It has a very similar pump to the later 12 valve but minis the electric stuff. My higher level maint told me that it was the torque converter I don't see how because you put it to the floor from a stop and it will take about 15 sec to get it to get to 1800 rpms we had to low lock it to day going up a hill in town because it powered out unloaded #@$%! so I am just looking for some ideas to fix it anything.

 

[nickleinonen]

how is engine speed when having trouble pulling the hill? was the ip rebuilt or just swapped over from the old core engine? governor on the pump ok?. i believe the cta is governed at 2500-2600rpm or so

 

[rbattelle]

If you're positive the engine is good, then something is causing a massive drag. Is the transmission cooled by engine coolant? If so, did the transmission burn up when the engine blew due to lack of coolant?

Just to be sure - the parking brakes aren't on, right?

Ryan

 

[bmoeller]

Does it make any black smoke?

A plugged air filter or fuel filter will cause low power.

 

[Forrest Nearing]

if there's no smoke, a broken/blocked AFC line will give you a real turd!

 

[SSwords]

does have some black smoke but not as much as the other ones I have worked on the air filter is new fuel is new it is the pump that came with the new motor it has a seperate cooler for the trans the brakes are not dragging and it does govern about 2500 and it will get their down hill but it is a dog up hill. Thats why I have been wondering if this pump is set for the cargo style trucks about 20. 000 lbs less because of the wrecker bed and winches