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Thread: What about a 6AT Cummins?

  1. #1
    Jester Guest

    Default What about a 6AT Cummins?

    I know they are not powerhouses but they seem like a better fit than the 6BT. It would be equal to a 6.2 GM that I was also considering.

    Any input?

  2. #2
    Join Date
    Jan 2004
    Location
    Washington State
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    1,652

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    I was talking to my friend Phil about the GM diesels. He has seen a lot of them with head problems. Brad the machinist says it is not if but when. They both hate them. They suggested if going diesel to use a Cummins or an old ford 6.9 or 7.3. Much better for longevity with less hassles and no known head problems.

  3. #3
    Jester Guest

    Default

    I am definitely not in love with the idea of a 6.2. Don't care for the V8 config and the know issues (even though some people play it down). I was only really interested cause of the ease of swap.

    The 6AT uses a chevy bellhousing and is smaller than the 6BT. The 4BT is not an option (for me) cause I just can see putting in a 4cyl - even if it does make more power.

    I hear parts are hard to come by for the 6AT but can't be harder than the stock motor.

  4. #4
    Join Date
    Jan 2004
    Location
    Remote, North Dakota
    Posts
    144

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    There is an easy and cheap fix for the 6.2/6.5 head cracking problem, and they can be good engines if treated like a typical SB Chevy, they cannot run with the IH/Ford diesels or Cummins.

  5. #5
    Jester Guest

    Default

    Quote Originally Posted by DNL View Post
    There is an easy and cheap fix for the 6.2/6.5 head cracking problem
    What is that?

  6. #6
    Join Date
    Jan 2004
    Location
    Remote, North Dakota
    Posts
    144

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    The heads crack between the valves, through a coolant passage. Ream out the coolant passage with a reamer, press in a bronze valve guide liner secured with green locktite, and presto, even if the head cracks, it can't leak coolant or cylinder pressure. I did this on a 1990 Suburban I had, worked great. I got the stuff I needed from the Diesel Depot, I think. It was in Florida or Georgia. Great guys to work with.

  7. #7
    Jester Guest

    Default

    And is it worth it? Is the 6.2 worth the effort or am I better off starting with a cummins? The install will be harder with the cummins but the end product may be way better.

  8. #8
    Join Date
    Dec 2006
    Location
    Covington, (the other) LA
    Posts
    60

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    A friend of mine had a 6.2 problem, but it was the head gasket that failed.
    Running along about 55-60 and poof! Making TONS of white smoke (steam?).
    The gasket let go from corrosion. He has a 4x2 duallie Cummins, now. And gets 22+ mpg.

  9. #9
    Join Date
    Jan 2004
    Location
    New Haven, CT
    Posts
    1,954

    Default

    Quote Originally Posted by teckhardt View Post
    And is it worth it? Is the 6.2 worth the effort or am I better off starting with a cummins? The install will be harder with the cummins but the end product may be way better.
    A 4BT will easily match the HP output of a stock 6.2 (130HP?) and even a CPL 858 will surpass the torque of a 6.2 (240lb-ft according to wikipedia). The 4BT and the 6.2/6.5 family are in completely different families and have very different life expectancies. How many 6.2's have you seen driving industrial equipment?

  10. #10
    Jester Guest

    Default

    Ok - so back to my original question. What about the 6AT? Seems a perfect match for the M.

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