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Thermodyne question

JAKES.

JAKES.

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Hi I was hoping those of you more seasoned people out there might know what I am looking at: I am looking at a running thermodyne it is a n/a, 2 valve,fuel pump with mechanical governor attached, the head has 20 bolts. which is all normal I am just wondering about the number stamped on the timing cover which reads:673E-5115727 . I thought all the n/a thermodynes would be stamped 673END ….. and the newer turboed ones would be 673ENDT.... so I just wondering why this one is just 673E.....? I just want learn some more about this one if anyone happens to know.
 
DMiller

DMiller

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Early Thermodynes were only 'E' Series, difference between Gas and Diesel(Same Block)

The engine model designation meanings have changed slightly through Mack's history, so the exact definition depends on if you have an older or newer model. For example, the letters for an early model mean the following:

  • E: Mack Diesel Engine
  • D: Derated Version of Engine
  • T: Turbocharged
  • B: Mack Dynatard Engine Brake
  • A: Single Stage Aftercooler
  • S: Two Stage Aftercooler
  • EN: Engine
  • END: Naturally Aspirated Diesel
  • ENDT: Turbocharged Diesel
  • ENDTB: Turbocharged Diesel with Engine Brake
  • ENDL: Lightweight Version of END
  • ENDLT: Lightweight Version of ENDT
Later were M Maxidyne and C California, the later models E was for Turbo Diesel.
 
JAKES.

JAKES.

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Well just an update I recently acquired a Maxitorque to mate up to the 237. Now been looking for another b cab and chassis to fill out the package and I am in the process of negotiating for a herd of B's that are looking for a new home such as: B60, B62, B66 and a B61 mixer chassis with the front pump. Sorry no pics of these trucks yet but I will soon. Interestingly all these are 4x4 too. One of the trucks appears to have Chrysler flathead which appears to be original. Was that a power plant option from the factory back in the day?
 
DMiller

DMiller

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Mack always produced their own, gas or diesel, do not believe a Chrysler was ever a option.
 
1693TA

1693TA

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EN-354 was an option which was a Chrysler 354 Hemi engine. Seen a couple in fire chassis and think they were B-95 series. I know they were original. EN-414 was also a Chrysler 413 engine but I don't remember the chassis series these were installed into.
 
kshansen

kshansen

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Can't swear that it was original but know one of our plants back in the 1970's had an older B model they used as a welding truck, Licoln SAE300 I think mounted on the back, that had a V-8 Chrysler engine in it!

I would not be surprised if it was the EN413 as it was a pretty good sized engine. I have an old Motors manual that does show a 413 in the Mack section and it says refer to Dodge section for the HT413
 
Last edited:
DMiller

DMiller

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We had Industrial Chrysler Generators we used to roll Baldwin Loco Engines with out on the River. Electro Motive power from old locomotives switched to River duty, engines ran WOT and motors on Prop Shafts did the grunt work. Tow they were in had the old Chrysler Industrial Hemi Generators sitting in the hole, other than tune up cannot remember ever having to delve into one.
 
kshansen

kshansen

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I also remember calling the local Mack parts department one time and trying to order a part for the carburetor or governor on an old B model with an EN707 engine and got told Mack did not make gas engines and I would need to figure out who put the engine in it and get parts from them. Took a little time looking and actually found a parts book in the back room and looked up the part number and called back with a Mack part number. Guess what the factory still had one in stock and I was able to fix the truck. Not sure if I managed to convince the parts guy or not!
 
DMiller

DMiller

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When worked Mack St Louis we worked major cities fire apparatus
A great deal of those old bulldogs were still gas
Dual distributor, dual plugs, dual exhaust on a inline six with straight pipes
 
JAKES.

JAKES.

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Thank you all for this info everyone, I do believe the truck I am looking at has the EN413. It is in the B62 which has the camel back springs and a wet kit. It is a heavy spec gas tractor. Sorry still no pics will try to get some by the end of the week. Thanks again all.
 
1693TA

1693TA

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Mack referred to that engine as an EN-414 and it was an option in the B-62 series. My B62SX originally had a Mack EN-464 engine which was a large six cylinder. The Chrysler produced EN-414 engine which was actually 413 cubic inch displacement and looked just like a later 440 Chrysler engine being of the raised block, ("RB") design. The later "440" was produced in 1965 from this earlier design. Though they look similar, the "361", and "383" series engines used basically the same, but a lower deck height, or "low block" design.
 
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