B61TENDT711

I bet the 5spd works with the Mack as the Cummins is also a 1500-2100rpm ranged engine, and because of the lower revs the Mack n Cummins units got the OD 5spd manual trans. . .

this dealer posted has the 673 available in 220hp,another dealer where i saw the mack engines was clark truck parts. I emailed them and asked about the 237hp Mack diesel and yup your right it was the ENDT675 they got a deal on a few dozen of them and where swapping out the 673 for the 675. . .

If i was to get my hands on the Mack powered M52A1 tractor would i be better off swapping the Thermodyne 673 for the Maxidyne 675 as they did because the truck is only a 5spd ? would it then be more worth while to swap in the 350hp motor with the 7spd trans if i'm going threw a the trouble of transplanting ?

Mike

So then if the 673 was designed for the multi speed trans then how come it help up to pulling 75-100K-Lb loads with just a 5spd trans mission ? wouldn't the truck have lugged = blown head gaskets ?

I was always told NEVER lug a Thermodyne !?!?!?

http://www.memphisequipment.com/Products/5ton.asp

Engine #1

Cummins...Model NHC-250

Horsepower...250 @ 2100 RPM

Displacement...855 cu. inches

In-Line 6 Cyl. Non-Turbocharged

Engine #2

Model...Mack ENDT-673

Type...In-Line 6 Cyl. Turbo Charged

Horsepower...220@ 2100 RPM

Displacement...672 cu. in.

Engine #3

Hercules/Continental

Model LDS-465-1A

Horsepower...205@ 2600 RPM

In-Line 6 Cyl. Turbo Charged

Displacement...478 cu. in.

Engine #4

Continental...Model R6602

Type...Valve in Head, 4 cyl, 6cyl

Horsepower...196 @ 2800 RPM

Displacement...602 cu. in.

Bore...4 7/8

Stroke...5 3/8

Oil Capacity...22 qts

Clutch

Spicer...15" Single Disk

Electrical System

24 Volt (optional 12 volt)

Transmission

Type...5- Speed, Manual

Spicer...6353, 5th Gear overdrive

Spicer...6352, 5th Gear Direct Transfer Case

Rockwell...Model T-138

As you can see there is nothing but 5 speed manual transmission options !?!?!?!?

Mike

ok so then the Military truck is really the ENDT675 as it has a 5spd manual transmission. . .that is how they got a 237hp Mack turbo diesel ?

either way the transmission is a 5spd there was no other trans option 5 forward speeds 5th was OD in the multifuel n mack engine 5th DD was for the Gas engined truck.

Mike

Now you call the 237hp an ENDT675 as where the 237hp Military truck had a ENDT673 Confusing . . .

I want to try n Find a Mack powered M52A1 5ton 6x6 truck tractor 237hp Mack turbo diesel 5spd spicer 6453? i think anywho 6.44 gears 11.00-20 tires.

I was hopping to find one these trucks some day swap on a set of 11R24.5's add some stack's and roll on. . .

Mike

so it's still in the BUY ME stages. . .

Mike

Are they still testing these unit's ? cause a friend of mind who is in the great sand box hasn't seen hide nor hair of this truck. . .But he says it sounds like a truck they could use desperately in a 6x6 version as well as the 6x4 version . . .

Mike

Hmmm i was told the 237 300 n 350 would spin right out 2300-2400rpm's and started pulling around 1,100-1,300rpms.

I also got the 237-350 Mack engines would withstand running 2200rpm down the road if loaded heavy on short trips then other say they'll hold 2250rpm all day long loaded or empty. . .

Mike

Whoa 900TQ !

Now that thing is a beast i'm told these things can be rapt right out to 2,400rpm shifting threw the gears and it'll hold 2200rpm sustained.

any truth to this ?

Mike

wow trucks a beast ! I haven't seen any in person yet but they must be out there then. It would make a fine 6x6 shocked they didn't go with an all whee drive version. . .

Mike

yea that i know there all Cummins powered unit's or they have the Multifuel unit. . .I don't want either of those 2 i want the mack powered unit. . .

Mike

Factory power settings:

Hp n TQ numbers ?

Maximum Rpm ?( redline)

Max sustained rpm ? ( highest rpm safely maintainable)

Can the motor be turned up ?

if so what kind of numbers can be turned from it ?

year range ? cubic inches ?

I want to some day own a military 5ton 6x6 truck tractor powered by the Mighty 237 Mack, so i am trying to learn any and everything i can about the motor if you have any info about the engine or even the Mil-spec 5ton truck it came in do tell i have open eye's n ears. . .

Mike

I heard there was a granite Mack armored up as a military prototype any body if this truck made it to production ?

Is there any Spec info on it ?

Motor ? power ? gear ratio ? wheels n tires ? configurations? ect . . .

Mike

Good to be here. . . thank you

Mike

More then likely so. . . I have 2 Old Mack's and looking into owning 2 Military Mack trucks as well. . .

The M123A1C is a Mack/Consolidated Basically its all Mack with a 785cid V-8 Cummins N/A diesel, turning 300hp n 900tq.

The M52 is a 5 ton Mack 6x6 powered by the 237hp Mack turbo diesel engine.

Maybe some day soon i'll get them trucks but for now i'm just a working man surviving. . .

Mike

I too just registered on up, that fine B-model registry dose have my B61 on there some place i know i added it years ago.

Mike

I just joined up seems to be a nice place here dedicated to Mack trucks.

Mike