MaxForce 10 failure

[Rob_M]

Originally Posted by Nemisus

Were there years that were better off? I ask because my in-laws just acquired a 2014/2015 Ambassador with the Maxforce.

Thanks for posting this.

On our fleet of trucks the pre-DEF fluid emission system was less reliable than the ones that started injecting DEF fluid. They did get more reliable as Navistar worked out some of the Emissions related problems. I don’t remember what year ranges were what, But my service truck was one of the first batches they leased and it was towed seven times in the first year and driven to the dealership multiple other times in 3 years.
They eventually had to lease more trucks just to have spares because they were stuck at the dealership so much.

The company I work for eventually used litigation to get out from under a lease agreement for hundreds of class seven service trucks with the Navistar max force 10 engines. These would be the same engines that were put in motorhomes. We now run Peterbuilts with the 9 L Cummins Which have proven to be very reliable.

[Traps90]

We had our 2013 Monaco 43DFT for 6-1/2 years. The only issue I had was it needed to get a new wiring harness installed. The original was rubbing on something and kept throwing codes saying Cam Position timing was off.
Navistar replaced the sensor twice before digging farther to find a whole the size of my little finger nail warn through the harness.
I did have to do 2 Parked regens in the time we owned, but that was cause of excess idling.
(Once while in Coburg at Factory for warranty work where it was started every morning and evening then brought back out to us.)
After the last computer update we had we never had to do another parked regen. The best advice for this engine is do not idle anymore than absolutely necessary and drive it like you stole it, putting around or babying this engine is not good for it.

[Rob_M]

Originally Posted by Traps90

….The best advice for this engine is do not idle anymore than absolutely necessary and drive it like you stole it, putting around or babying this engine is not good for it.

That is very good advice. Fact is, at less than 60mph I would drop down to 5th gear to keep rpm’s up. To do a regen while driving the rpm’s need to be above a certain level.

Most of our issues were stopped up exhaust filters and charge air coolers. The latter is caused by the aggressive EGR system Navistar used to pass emissions. We also found that changing the oil at 5,000 miles or less helped to keep the CAC clear.
We do in-fact idle our trucks quite a bit because we run a crane and / or air compressor off the pto. At idle the turbos were slobbering oil into the intake tract. Clean oil went on through the CAC, carboned up dirty oil stopped it up.