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Old Oiler Guru's

Discussion in '1982-Present GM Diesel' started by 79Stomper, Jul 21, 2006.

  1. 79Stomper

    79Stomper 1/2 ton status Premium Member GMOTM Winner

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    Hello all, first time poster in this diesel section. So I have a few questions. I have searched a little on here for the answer but kind of hard to explain to a search engine.

    I recently picked up an 86 M1008 to strip for my M1009. (6.2 I would assume) I have ripped the wiring harness out of the truck and was finishing up the engine wiring harness today. Well while I was pulling it through the injector lines I noticed that there was a second switch/sensor of some sort on the back of the block. Now I have rebuilt quite a few 350's and from what I have guessed I think I am somewhat right on most of the switches/sensors.

    1. The switch/sensor in question is located just above the transmission bellhousing. It wasn't connected to a wire but was just there. There is also one that connects into the manifold for which I am guessing it is the temp sensor. So what is this other one on the back of the motor.

    2. Also would anyone happen to have a diesel specific wiring diagram so I can begin to replicate a new harness. I looked at the sticky and well all it had was gassers.

    3. On the front of the block next to the #1 injector/glowplug, that is the pressure switch?

    I will be posting more in this section as time goes on. I have worked on a few diesels but most were HMMWV's and 2nd echelon stuff.



    TIA
    James
     
  2. steve_kibbe

    steve_kibbe 1/2 ton status

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    IIRC the oil pressure is on the back of the block at the fire wall on the ds:D
     
  3. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    The back of the block is where the GP controller lives, and there is a temp inhibit switch there too. At 120F the inhibit switch turns off the HPCA solenoid on the IP. Think of it as a fast idle dealie for cold engine. The GP controller also samples engine temps so it can adjust glow times...

    The oil pressure switch is in approximately the same location as a sbc.

    Jarhead has an awesome 6.2 manual that should likely have wiring. If not, someone else might. I prefer simple, and wiring a 6.2 is simple. Manual GP's are easy to do, plus 12V+ in the run/start position for the IP and you're gold. The alt and headlight stuff should all be the same.

    Rene
     
  4. jarheadk5

    jarheadk5 1/2 ton status

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    Check my 6.2 tech info sticky post - I scanned every page I could find in my book about the CUCV glowplug system. Hope it helps.

    S/F
     
  5. 79Stomper

    79Stomper 1/2 ton status Premium Member GMOTM Winner

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    Thanks for posting. SO far it is helping me determine which wires are which in the harness. I think I will just more than likely do the manual glow plugs to keep my engine bay somewhat clean of a rats nest of wiring. I am sure I will be posting more in the weeks as the install comes into play.
     

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