johnnyg8
New member
- 8
- 0
- 1
- Location
- greensboro,nc
Dear Steel Soldier friends,
I bought the M816 5-ton Student Driver wrecker from Ft. Leonard Wood, MO last year and am just getting around to trying to get her running again. Seems the Cummins 6-cylinder NHC-250 engine was locked up from sitting? Would not budge last fall with bar on engine or attempted prysing via flywheel.
I removed the injectors and poured 2 gallons of Marvel Mystery Oil amongst all the 6 cylinders and it has soaked for 3 months. We will try to bar the engine again and see if it will move now.
An expert says the 6x6 family is bad about sitting around and then getting water into their exhaust stacks which goes down and then rises from the bottom of the muffler up into the engine. He suggested i remove the Allen plug from the BOTTOM of the muffler- says often water drains out then.
He said perhaps the oil pan can be removed and the heads, one by one and then it can be determined what is locked up- says maybe a sleeve kit or two may do the trick, but a rebuilt engine is better. The wrecker only has 24,000 miles on it.
Also for some reason the recovery school's maintenance guys at the base had taken off the gear shifter and the plate in the floor above the transmission. Why? Is there a common reason why they'd do that? To change the clutch? Access the trans gears?
They had removed the front axle of the rear tandems, I guess for towing it.
I appreciate anybody's insights into whether or not the engine will run again or a rebuilt one is better, and about the removal of the trans shifter and cover.
Johnny from NC
I bought the M816 5-ton Student Driver wrecker from Ft. Leonard Wood, MO last year and am just getting around to trying to get her running again. Seems the Cummins 6-cylinder NHC-250 engine was locked up from sitting? Would not budge last fall with bar on engine or attempted prysing via flywheel.
I removed the injectors and poured 2 gallons of Marvel Mystery Oil amongst all the 6 cylinders and it has soaked for 3 months. We will try to bar the engine again and see if it will move now.
An expert says the 6x6 family is bad about sitting around and then getting water into their exhaust stacks which goes down and then rises from the bottom of the muffler up into the engine. He suggested i remove the Allen plug from the BOTTOM of the muffler- says often water drains out then.
He said perhaps the oil pan can be removed and the heads, one by one and then it can be determined what is locked up- says maybe a sleeve kit or two may do the trick, but a rebuilt engine is better. The wrecker only has 24,000 miles on it.
Also for some reason the recovery school's maintenance guys at the base had taken off the gear shifter and the plate in the floor above the transmission. Why? Is there a common reason why they'd do that? To change the clutch? Access the trans gears?
They had removed the front axle of the rear tandems, I guess for towing it.
I appreciate anybody's insights into whether or not the engine will run again or a rebuilt one is better, and about the removal of the trans shifter and cover.
Johnny from NC
worth. Keep us posted!
