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Forest Service 3A

Discussion in 'Builds and Fabricators Forum' started by garage gnome, Jan 10, 2014.

  1. Mar 12, 2016
    garage gnome

    garage gnome Rust polisher

    Western MA
    Joined:
    Jun 19, 2009
    Messages:
    2,068
    This past Monday, tragedy struck. I started up Ted, after priming the oil system, and he was running great, after some carburetor tuning. I let him get up to temperature and I followed the break in procedure in the manual. Then I took him for a test ride around the house. There was nothing out of the ordinary for noises other then the ticking of the valves, which is expected. Oil pressure was great as well. Then badness. About 2hrs after initial startup and while driving, the jeep came to a abrupt stop and I mean a DEAD stop. A few choice words were said at this time. The engine would not turn over...

    I towed it back to the garage with the other fire jeep (how ironic). My immediate thought was that the head gasket blew and a cylinder was full of coolant. So I pulled the plugs and nothing. Next, I drained the oil. Looked perfect with no metal in it. Next thought was a bent valve, so I pulled the manifolds off and valve cover. Nothing wrong there. Next idea was the oil jet somehow broke off and got stuck in the timing gears. So off goes the oil pan and timing gear cover. All is well there. Out comes the engine next. I started popping bearing caps off and checking the pistons to make sure the pistons didn't get stuck in the bores. Nope, they all move fine. Then off comes the rear main cap.

    Voila, the rear bearing had welded itself partially to the crank. I brought the crank and bearing back to the machine shop and they were amazed at what happened. They polished the journal again and it turned out to be ok. They also ordered a new set of main bearings. I guess it could have been much worse, but it still sucked having to pull the engine out.

    [​IMG]
     
  2. Mar 12, 2016
    garage gnome

    garage gnome Rust polisher

    Western MA
    Joined:
    Jun 19, 2009
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    2,068
    As you can see, it's only the right side of the bearing that let go.

    [​IMG]
     
  3. Mar 12, 2016
    Focker

    Focker That's what I do, I know things and I fix stuff. Staff Member 2019 Sponsor

    Tri-Cities WA
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    Aug 18, 2014
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    6,411
    Ugh...:mad:
     
  4. Mar 12, 2016
    garage gnome

    garage gnome Rust polisher

    Western MA
    Joined:
    Jun 19, 2009
    Messages:
    2,068
    At least the machine shop is making it right. Could be worse like a connecting rod sticking out of the side.

    And the fun continues. The block has to go back to the machine shop. #3 and 4 exhaust valve stems are scored up due to the new valve guides.
     
  5. Mar 12, 2016
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member

    Tantallon, Nova...
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    Nov 22, 2003
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    6,104
  6. Mar 12, 2016
    garage gnome

    garage gnome Rust polisher

    Western MA
    Joined:
    Jun 19, 2009
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    2,068
    Huh, I didn't realize you had the same issue. From what I gathered from your thread, there was noting wrong with the diameter of your crank. They checked mine and it was spot on.
     
  7. Mar 12, 2016
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member

    Tantallon, Nova...
    Joined:
    Nov 22, 2003
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    Yeah, everything was the right size, I suspect there was some crud in the crank oil passages- that was a crank they had sold me in lieu of machining mine when I had it re-built.

    H.
     
    garage gnome likes this.
  8. Apr 10, 2016
    garage gnome

    garage gnome Rust polisher

    Western MA
    Joined:
    Jun 19, 2009
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    Update! Ted is the very happy super jeep. Only issue is that about 3/4 throttle, it doesn't run too great. Its getting too much gas. I made some new jets up and it is better, but still not great. Waiting on some brass rod to make new ones. I made some out of steel just to it out.

    Original jet is in the middle.

    [​IMG]

    And then I was out playing with the go pro camera.

    [​IMG]

    I had a passenger too today Smokey!

    [​IMG]

    And we found a visitor too, a pretty big moose. Didn't see it, just the tracks!

    [​IMG]
     
    Danefraz likes this.
  9. Apr 14, 2016
    68BuickV6

    68BuickV6 Well-Known Member

    Chino, CA.
    Joined:
    Mar 12, 2012
    Messages:
    2,016
    Awesome!
     

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