Why won't my 6.2L diesel pickup start!?

I have just purchased a 1982 Chevy pickup with a 6.2 diesel which has sat for about 6 months… owner claims engine ran fine when he parked it, but it needs a new tranny. When I try starting the engine (with 2 batteries connected via boosters to 2 other trucks) it turns over a bit slow and makes a banging sound on each crank, and doesn’t start. Help!

To sidecar0: High milage (older chevys only have the 5 digit odometer so who knows) and it is automatic.

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3 Responses to Why won't my 6.2L diesel pickup start!?

  1. sidecar0 November 6, 2010 at 7:56 am #

    Mileage? Standard or Automatic? Take the Batteries Out and Have them fully Charged then "Load Tested" at 50% of CCA for 15 Seconds not dropping below 9.6 Volts during the Test Showing you IF the Batteries Will Take and Hold a Charge.

    Change the Oil and Filter, "Let the Oil Pan Drain for a While!".

    "Banging?" Pull the Head(s) and check the Valves, Pistons & Timing Chain!

    Drain Fuel Tank, Flush Fuel Lines, New Fuel Filter. (Diesel does tend to grow algie at times when sitting for a long time!)

  2. dbHARMjr November 6, 2010 at 7:56 am #

    I don’t know anything about diesel engins, but I just can’t BELIEVE that you purchased a 1982 truck that had "sat for about 6 months" without TEST DRIVING it?!?

    A "banging sound on each crank" sounds like a broken piston rod to me.

  3. Northy November 6, 2010 at 7:56 am #

    a diesel needs to turn over fast enough to fire- so you’ll need either some really good jumper cables or charged batteries first off. The way a diesel ‘fires’ is by compression…no spark plugs. BUT, there are glow plugs. Do you wait for them to cycle before you start cranking? The older chevy’s got a little yellow light that flashes that says ‘wait to start’. They’ll cycle a few times. If they’re any good they’ll warm the cylinder up so it’ll ignite the fuel faster. If they’re shot, or the light doesn’t come on, or you can’t hear the solenoids clicking- Then get a can of ether…good stuff, like pyroil or snap. Take the top off the air cleaner, and give it a two second burst of fluid in the intake. Crank it over and it should fire. If not, repeat with another one or two second burst. Don’t use too much, because you can lock the engine from the ether(it won’t wreck the engine, but you’ll have to wait a few minutes for the ether to evaporate before you can try to start it again). The old 6.2’s were finicky old engines…but they were still good. Good luck!