4MG Rebuild

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Oxbow, Feb 19, 2024.

  1. SmallPackage

    SmallPackage Road Train Member

    4,555
    13,705
    Dec 20, 2019
    Marion Texas
    0
    Sounds like the old engine was running good besides the crack so to me Now would be a good time to completely tear down and fix the cracked bare block. Rinse it out real good so you know the shavings are out. Leisurely put it back together it and put it in a truck that doesn’t have to work hard anymore. Just like @woreout said. I don’t like to see good things go to waste and I don’t like to see things scrapped that can be reasonably fixed and repurposed in other ways.
     
    JoeyJunk, Feedman, Last Call and 2 others Thank this.
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  3. SmallPackage

    SmallPackage Road Train Member

    4,555
    13,705
    Dec 20, 2019
    Marion Texas
    0
    If Pete was to make a coe for American market today. I think you nailed it. This is what they should do. Follow the retro trend and bring back the old “bubble nose”.
     
  4. SmallPackage

    SmallPackage Road Train Member

    4,555
    13,705
    Dec 20, 2019
    Marion Texas
    0
    Some of the old timers I was raised around would do something like that to keep the stat open just a little bit permanently. I know drilling a hole in one is an old trick to allow some water to bypass. Was supposed to help engine run cooler. Guys that ran from here up into the rockies would do this. This was back in the days when folks were known to remove a stat in the summer months down here in the 100 degree south. These tricks were just enough that it kept them from having to do that and they could just leave it in so it still allowed heat to build in winter.
     
  5. Last Call

    Last Call Road Train Member

    7,568
    45,827
    Mar 15, 2021
    0
    I couldn’t pass up the photo op when I took the cab off lol
     
  6. Oxbow

    Oxbow Road Train Member

    10,637
    107,818
    Nov 24, 2015
    Idaho
    0
    I was gonna say, I never figured you as a set-back-axle kinda guy!
     
  7. broke down plumber

    broke down plumber Medium Load Member

    372
    797
    Jan 25, 2024
    0
    My ole g30 1 ton service boxtruck has a a piece of cardboard for a wintertime thermostat .
     
    Feedman, 50WT and Oxbow Thank this.
  8. Oxbow

    Oxbow Road Train Member

    10,637
    107,818
    Nov 24, 2015
    Idaho
    0
    Well, all except for the liners the block is stripped.
    upload_2024-2-20_18-16-1.jpeg
    The crank looks to be in decent shape, a couple of the journals have a light scratch that you can just feel with a fingernail.
    upload_2024-2-20_18-17-48.jpeg
    Five out of six rod cap bearings had a similar bad spot. I'm curious as to what caused this.
    upload_2024-2-20_18-19-29.jpeg
    The thrust washers look good to my untrained eye.
    upload_2024-2-20_18-20-44.jpeg

    I need to look at the cam closer, but nothing looked bad to me. The cam bearings in the block had some uneven wear in a couple of them. I'll dig into that later.

    We developed a fairly safe system for flipping the block over - at least no one lost any fingers!
    upload_2024-2-20_18-23-42.jpeg
     
  9. Last Call

    Last Call Road Train Member

    7,568
    45,827
    Mar 15, 2021
    0
    You know me well lol
     
    JoeyJunk and Oxbow Thank this.
  10. Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

    7,447
    15,306
    Jan 20, 2010
    Hesperia, Ca.
    0
    I sure miss that color of YELLOW……….
     
    JoeyJunk, Feedman, Oxbow and 1 other person Thank this.
  11. Oxbow

    Oxbow Road Train Member

    10,637
    107,818
    Nov 24, 2015
    Idaho
    0
    I sure appreciate it Russ. It is tempting to go with the 160-1131 pistons. I looked them up and they are $300 a piece for "Body Assembly - Piston". I assume that includes the wrist pin/rod. Then there is around $100 for rings for each hole. If I did that and reused the liners that cam out of this engine the parts would about pay for the extra labor to pull the cylinder packs out of the other one. I would have to buy nozzles to match too though.

    This engine really doesn't look like they had a ton of miles on it since rebuild. We are planning to put the new head from the other one on this one. I need to inspect the cam yet, and the cam bearings. I'll get some better photos and get everyone's opinion.

    More to come!

    Thanks
     
    JoeyJunk, Feedman, jamespmack and 2 others Thank this.
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.