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Thread: AM General 6.5

  1. #11

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    I'm going to pull it out this weekend and get the motor opened up and check. I agree, back in the 80s I had a 80 Impala and on weekends rebuild motors for people. Popout my engine out, drop theirs in and test drive, if everything ok, pull it out and have mine back in for work Monday AM.
    1994 C3500, vin "F". PMD w/heatsync, mech. waste gate, 4" exhaust, cold air intake. 165,000 miles

  2. #12

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    After getting things cleaned up after the hurricane, I'm finally back to working on my engine. Where I'm at right now is the crank out of the old motor measured out at: Rod journals 1) 2.400, 2) 2.401, 3) 2.394, 4) 2.398. Main journals 1) 2.946, 2) 2.947, 3) 2.948, 4) 2.948 5) 2.948. I have been trying to find info on standard crank diameters and what the max tolerance is for them. Am I able to go back in with standard bearings? The old engine had .013 across top of mains and standard on lower caps, rods are all standard bearings. Lucky so far no cracks in this old block, 599, heads look good also. Discovered water leakage was from truck sitting with intake off and hood slightly open and rain dripping into #8 cylinder.

    Found this link on internet: http://www.73-87chevytrucks.com/tech...sel_Engine.pdf
    Last edited by agb1758c; 10-04-2017 at 08:04 PM.
    1994 C3500, vin "F". PMD w/heatsync, mech. waste gate, 4" exhaust, cold air intake. 165,000 miles

  3. #13
    Join Date
    Feb 2007
    Location
    Baja California Sur Mexico
    Posts
    2,806

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    A lot of variation there. I use "plastigauge" , put a piece in each bearing and assemble dry to get the clearance. I saw the clearances on the internet, can't remember well, but 1.5 to 3.5 thou is the range.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban "F" VIN #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, Positrac 3.73 diff, 17 mpg highway.
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, 21 years.

  4. #14

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    Been awhile but finally got back to working on the motor, hoping to install crank and pistons tomorrow. Got the heads cleaned up and for the most part they seem to be in good shape. The only cracks found were in the pre-cups, but none to the fire ring. Longest crack 5/16, several 3/16 and 1/16 inch long. No cracks between the valves or around top of cylinder, been fairly lucky to this point with this motor.

    motor 082.jpg
    motor 080.jpg
    1994 C3500, vin "F". PMD w/heatsync, mech. waste gate, 4" exhaust, cold air intake. 165,000 miles

  5. #15

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    She is starting to take shape. Tomorrow will finish her up, install injectors, manifolds and turbo..waiting on new IC, should be here this up coming week along with all the parts for my braided lines.

    motor 006.jpg
    1994 C3500, vin "F". PMD w/heatsync, mech. waste gate, 4" exhaust, cold air intake. 165,000 miles

  6. #16
    Join Date
    Feb 2007
    Location
    Baja California Sur Mexico
    Posts
    2,806

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    You work fast, my engine has been at that stage for more than 6 months. Perhaps 'Ill work on it bit today. What are you going to do about the bell housing bolts that will now be metric? The old ones have a tread projecting, to bolt other things to, they are not available here.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban "F" VIN #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, Positrac 3.73 diff, 17 mpg highway.
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, 21 years.

  7. #17

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    I'm going have to check out my transmission mounting bolts, I don't recall any being anything other than regular bolts. I have several different fastener suppliers here that have always been able to help me out when needed. I remember trying my tranny bolts in the AM Gen when I was putting it on the engine stand and they screwed in but were to short to mount motor to stand. When I start this thing for the first time should I use my standard chip in the computer or just go ahead and put in the new performance chip. I had heard best to start it off with the standard one.
    1994 C3500, vin "F". PMD w/heatsync, mech. waste gate, 4" exhaust, cold air intake. 165,000 miles

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