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Any tips on buying a 6.2L diesel?

Discussion in '1982-Present GM Diesel' started by u2slow, Sep 3, 2002.

  1. u2slow

    u2slow 1/2 ton status

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    I've got my eye on an '87 K20 Burban with a 6.2L diesel. How do I assess the engine? What kind of mileage (especially highway) do they get?

    It would be my first diesel truck - I have a a '91 V3500 with a TBI 350 - that I can no longer afford to fuel /forums/images/icons/frown.gif
    I'm driving a Sidekick instead, but I can't fit the wife kid, stroller, and groceries on the same trip.

    The other possibility is to do a diesel swap on the V3500 by finding a cheap donor truck. Any tips on a assessing a diesel in a running, but undriveable truck?
     
  2. Tybee

    Tybee 1/2 ton status

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    Do a search, I get 18 to 20 w/3.73s and 35s in a k5.
     
  3. arveetek

    arveetek 1/2 ton status

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    Since the 'burb is a 3/4 ton 4x4, it most likely has a TH400 three-speed auto without overdrive. You won't get the best mileage this way. The most I've gotten out of my K-10 is 16 mpg. One time I recorded 21 mpg, but it must have been a mistake. I've mostly gotten 14 to 15 since then.

    My 3/4 ton 2WD with 700R4 auto overdrive, 4.10 gears and 27" tires gets a consisten 18 mpg, sometimes as high as 20.

    You'll get the best mileage in a 1/2 ton, 2WD or 4WD, with overdrive tranny.

    Casey
     
  4. 82Jimmy

    82Jimmy 1/2 ton status

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    I talked to a guy that rebuilds them, and he told me not to get one, cause they aren't "true" disel engines (i am aware i spelled it wrong) and they are like 5.7 liter engines.
     
  5. Dirty Dave

    Dirty Dave 1/2 ton status

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    82Jimmy, Sorry but who ever told you that is a complete and utter idiot. The 6.2 was designed from the oil pan up by Detroit Diesel who was at the time owned by GM. Actually it is a pretty common rumor and nodoubt part of the reason 6.2's have a bad rap.
     
  6. Tybee

    Tybee 1/2 ton status

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    It does say 6.2 liter not 5.7 and its a 379 ci not 350.
     
  7. kickinasphalt383

    kickinasphalt383 1/2 ton status

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    uh thats not good, he rebuilds them and still thinks that they are based on the 350. its dumbaces like that screw rebuilds up, that cost the customer. my advice: whatever you buy, don't buy a rebuild from him /forums/images/icons/grin.gif
     
  8. JHG

    JHG 1/2 ton status

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    He´s probably thinking about the 350 Buick or Olds motor they converted to diesel. Thats not the same engine......

    Jon H.
     
  9. 4x4dreamer

    4x4dreamer 1/2 ton status

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    Detroit built the 6.2. Shortly after I bought mine I called my uncle who's been a trucker for over 30 years and he knew exactly which motor I was talking about. He told me it was an awesome piece of hardware and should last me forever. He knew about the 350 diesel as well, knew it was a huge POS.
     
  10. u2slow

    u2slow 1/2 ton status

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    Wooohoooo!

    I just laid a down a deposit on an '84 C20 Burb with 6.2L/TH400. /forums/images/icons/cool.gif

    I'm not big on the power-everything, but its an 8-passenger with the bucket seats. (We can have 5 more kids now!) Tranny rebuilt 8 months ago, and injection pump rebuilt 4 months ago.

    The RPO code tag is missing from the glovebox - so I can't tell what axle ratio it has. It has the 14-bolt semi-floater. Any guess on the ratio? (I'll find out when I pop the cover anyways).

    The wife said "Maintenance ONLY! Its NOT a project!" but I know I'll have my spare 3.73 full-floater and 1-ton spindles/brakes on there as soon as I "change the oil" /forums/images/icons/wink.gif /forums/images/icons/grin.gif

    I haven't even paid for it and we've already agreed on a pet name for the Burb: "The diesel bandwagon" /forums/images/icons/smirk.gif
     
  11. arveetek

    arveetek 1/2 ton status

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    Congratulations!

    If I were a betting man, I'd place some money on the guess that you have a 4.10 axle sitting under that puppy. That seems to be the General's favorite in 3/4 ton 2WD diesel-powered trucks.

    Casey
     
  12. calcide

    calcide 1/2 ton status

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    I've also been told that a 6.2 isn't a "true" diesel engine, since it has precombustion chambers. The guy that told me this was VERY knowlegeable about diesels.

    Either way, it doesn't really matter. It burns diesel fuel, gets good mileage and lasts forever. Good enough for me.
     
  13. Dirty Dave

    Dirty Dave 1/2 ton status

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    He may be VERY knowlegeable about diesels but he dont know crap about the 6.2. This kind of thing is how the 6.2 gets lumped in with the 350 diesel and given a bad name.
     
  14. calcide

    calcide 1/2 ton status

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    Actually, he knew more about the 6.2 than I do, and I've read everything I could find on it (but I'm still no expert). I suppose that a "true" diesel is direct injected with no precombustion chamber. How does that make it get "lumped in with the 350 diesel and given a bad name"? Who cares anyway? I wish everyone hated these engines, more for me. Do you have a 6.2 as a status symbol? Are your neighbors proud?

    But then, all these automotive diesels are piss-ant anyway. REAL diesels are 2-stroke.
     
  15. Dirty Dave

    Dirty Dave 1/2 ton status

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    Do you have a 6.2 as a status symbol? No I have a POWER STROKE as a status symbol, or at least some sort of symbol.

    Are your neighbors proud? Yep and happy. Happy I got a take home car so I dont wake them up at 4am with a rattle box.
     
  16. Tybee

    Tybee 1/2 ton status

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    Isnt the 6.5 the same way? Is that like TBI and FI in a gasser? Either way there both gassers. I think if runs diesel it would be a "true" diesel, just my 2 cents. By the way did you ever get your turbo installed?
     
  17. dubl_t

    dubl_t 1/2 ton status

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    I think the guy talkin about pre-con chambers is on crack, since the 6.2 doesn't have them. The Cummins do, and that's part of what makes them so expensive to rebuild. Now he's gonna say Cummins ain't a "real" Diesel?
     
  18. dubl_t

    dubl_t 1/2 ton status

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    And also, it's a good, no great, thing that the Detroits used in GM vehicles have sucha bad rap. Could you picture (or pay for) a Bourbon w/a Cummins Diesel?
    Anyways, get the Haynes Diesel Tech Book, it's full of excellent stuff. And for cryin out loud, open up the exhaust and put a turbo on it! or at least propane injection.
     
  19. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    Your idea of a status symbol is a PS? OH MAN, how PATHETIC........ /forums/images/icons/tongue.gif
     
  20. BlueBlazer

    BlueBlazer 1/2 ton status

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    Just curious what model Cummins you are talking about here.
     

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