M123 Mack running after sitting 5 years

Mack M123 military truck with a Cummins V8-300 running after sitting for 5 or so years.

Category:

Autos & Vehicles

Tags:

• M123
• 10
• ton
• Mack
• military
• truck

[m35a2ww]

Depends, who is on the other end? ;-)

[m35a2ww]

The ISX was introduced in 1998. The push tubes for the 855 are twice as long as the V8-504 or the 555 and they wouldn't fit in the followers or through the holes in the heads. The 855 is still alive and well in off road applications. Get a pre 2007 engine on the dyno and you still see fire out the stack. 23 years at Cummins on this end, plus the jobs prior the where I am now and 3 generations of Cat, Cummins and DD mechanics in the family. I just like to mess around with old MV's!

[itzenboy]

V8 cummins are pieces of shit, but any inline cummins can kick the shit outta most other brands... and now cummins is going to make another V8 cummins for 1/2 ton dodge trucks, its a 5 liter... hope its better than the old V8 cummins =)

[m35a2ww]

Dunno 'bout that. The V8 was a leader back when it was made. They can be overfueled and run the piss out of 'em and they still last. The inline 6 is a very robust engine too. Do your homework buddy. Work on a few and see how they are built.

[roadwolf2]

would that be a cummins 903 series v8

[m35a2ww]

Not a 903. It's a V-8 300, naturally asperated. I believe these were made before the 903 and they might be part of the VIN/VIM engines...or maybe those were the small V6 and V8s...I don't remember.

[FordsSuck95]

they just never die

[5roaddog]

why in the world do you need an extension on the fifth wheel, i thought those was up over height

[14polaris14]

is that 300 ci? or no?

[TheMilitarynut]

Is that Will Wagner I hear behind the camera, or was h not there that day??

[dakman98rt]

Talk about over fueling, I seen a guy take the 855 Cummins Big Cam injector push rods and used the as push rods for the valves on a Cummins 555 V-8. I heard stories about fire from the exhaust and thought they were just truckers tales. After that guy did that, I knew then that fire from the exhaust stack was no fairy tale. While the truck was running down the road, it was actually throwing fire out of the exhaust. It was like watching a piles of leaves burn, just lit ashes being thrown out.

[dakman98rt]

Today the EPA has killed off all of the Cummins motors that we grew up with, Gone is the old 855 engine known as the Big Cam or NTC or N14 Cummins. Also gone is the L10 also known as the M11. I don't think we will ever see a V-8 diesel used again for commercial class 8 civillian trucks here in America again. The replacement Cummins for the 855 engine is a dual overhead cam motor called the ISX introduced back in 2001.

[dakman98rt]

Cat had 2 V-8 engines also, the 3208 which was great for marine applications, but junky for truck applications. Then the 3408 was a good motor, but too expensive to repair. The last manufacturer to have a diesel V-8 was in the early 90's which was Detriot Diesel which those were 2 stroke. The last detriot V-8 made was the Silver 92 series. I myself worked on alot of the V-8 71 series 2 stroke engine, the Detriot Silver 92 did alot of screamin and went no where fast

[dakman98rt]

V-8 diesel engines were the in thing back in the early and mid 70's as they orginally did have more power than a straight six from that time period. But as the 6 cylinder inline diesel engines got more and more powerful, the V-8 started to disappear. Mack actually had thier own V-8 in both turbo and naturally aspirated versions, many of us may remember them mainly in those Superliners which weren't so super.

[dakman98rt]

I remember there were 2 models of Cummins V-8 engines for trucks bak in the day, there was the 903 which many of us so lovingly called the nine o nothing which believ it or not the military still uses that engine today, but has long since disappeared from commercial use in civillian trucks. The next smaller Cummins V-8 was the 555 cubic inch which was nick named the triple nickle which could be naturally aspirated and turbo charged.