C-15 MXS valvetrain issues

The acert's aint bad motors other than the chity fuel mileage.Once you throw away the stock muffers and put "straight through" muffers on it will help some on the fuel milage. My MSX Cat brake got weake and I took it to a Cat shot in Denver to have it checked out and to have a overhead ran on it. They said there was nothing wrong with the Cat brake, the truck did run better after the overhead but the Cat brake was way off. When I would turn it on it sounded like air comming out of a ballon instade of the crasp cracking sound.
The problem was a broken hold down bolt on the brake and a broken rocker shaft. My "normal" cat shop that I go to found it and said there was a service bulletin out for new hold bolts and if there were broken rocker shafts to replace all the exhaust rockers at no charge. Why the shop in Denver missed that is beyond me.

The BXS was the first of the Acerts then MXS and the NXS. To run a overhead on a BXS you have to take the Cat brake off to set the valves, MXS and NXS you dont. The NXS have updated intake valve actuators and are more problem free than the BXS or MXS (I have done replaced all but 1 on my MXS).

 

Update for me: they replaced the head, and as I sit here I am waiting to see if the job will be finished today.

I was given a Penske POS to drive so I could complete my run, and I do not see how those other drivers can drive a Century class. Awful! No wonder those big company drivers seem so worked up all the time.

 

I have been informed that my particular Cat motor is an SDP. Not an MXS or NXS or even BXS.

I still have no idea what it all means, except these ain't like the Cat's I grew up around.

 

Just immagine if those wheelholders ever drove a real truck and then had to go back

 

Did u bring your glove and bat?LOL

 

I'm guessin but a schnieder instructer has prolly been driving for like what 4 maybe 5 years. kinda like making somebody a trainer after 1 year experience