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Question about GM 6-71 diesel engines

Discussion in 'Armor and Armored Fighting Vehicles' started by Seroster, Mar 31, 2018.

  1. Seroster

    Seroster New Member

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    Hi all,

    Most of the marks of the British and Canadian-produced Valentine tank were powered by the GMC 6-71 diesel engine (apparently referred to by us Canadians as the GMC 6004). The late model Valentines used a better version producing 165 BHP instead of 138.

    For the "Valentine 17 Pounder SP" aka "Archer", a variant of the engine was used which I've seen referred to as the "GMC 6-71M" which produced more horsepower - I think 192.

    Does anyone know where I could learn more about this variant of the engine? I presume, although maybe incorrectly, that the M didn't stand for "marine", as in the version of the engine used in landing craft. Although according to wikipedia that engine did produce more horsepower.
     
  2. OpanaPointer

    OpanaPointer I Point at Opana Staff Member Patron   WW2|ORG Editor

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    It's a General Motors engine. They might have a manual online.
     
  3. RichTO90

    RichTO90 Well-Known Member

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    There were four General Motor diesel engine divisions in WW2. Detroit Diesel built the 1 to 6-cylinder diesels of 10 to 250 HP. Cleveland Disel built in the 150 to 2,000 HP class. Electro-Motive built locomotive and some shipboard diesels. And Diesel Equipment built components for the other three.

    Detroit Diesel's 6-71 was the basis for all its tank engines. The "6" simply identified the number of cylinders and all were inline engines. The 6-71 in twin-engine configuration as in the Medium Tank M4A2 and others was know as the 6046 or Twin Diesel. However, Grey Marine also took the 6-71 and modified it as a marine engine for use on landing craft, such as the LCVP. Those were usually designated 6-71M, but I doubt that would get recycled back to tank production. Then there was the GM 6051, AKA the Quad Diesel, which used four 6-71's as a power plant of the LCS(L). GM 6004 was simply the designation for the installation in the Valentine of the 6-71.
     
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  4. OpanaPointer

    OpanaPointer I Point at Opana Staff Member Patron   WW2|ORG Editor

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  5. Seroster

    Seroster New Member

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    Hi guys,

    My apologies - I should have said thank you all for your answers, earlier.

    Followup detail: I was just going over the vehicle manual PDF, and it refers to the engine as 6-71M and as type 6062.

    I am trying to google for more details but not finding much, except a Google Books hit on "Catalog of Copyright Entries" has the following:

    [​IMG]

    (Sadly the downloads for the specs manuals on that one site seem to require membership in their diesel club)

    I don't suppose that makes anything clearer? I can't find much online on GMC 6062...
     
    Last edited: May 27, 2018
  6. OpanaPointer

    OpanaPointer I Point at Opana Staff Member Patron   WW2|ORG Editor

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    I imagine GM has a historical section, but she might have the weekend off.
     
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  7. Seroster

    Seroster New Member

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    Good call! I'll see if I can learn anything from them.
     

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