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A few notes after the LIM job

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  • A few notes after the LIM job

    This is geared mostly to those who have yet to do this, especially those of you who are used to conventional pushrod type motors...

    The upper right and lower left diagonal bolts bound up during reassembly which made it impossible to torque them properly. Next time I’ll use the metal gaskets and maybe do some filing on the holes in the manifold so they’ll go in better if that was the problem. Also the plastic push rod guides on the gaskets get in the way as you’re trying to lower the LIM in place. I had to put a dab of silicone on the pegs of the gasket and let it set before I tried to set it in. The pushrods were also a PIA to install, particularly if you’re used to installing pushrods in a conventional pushrod type engine. You can’t tell if the ends of the push rods are actually going where they’re supposed to go. To make sure they did, I installed the rocker arms and turned the crank by hand and made sure all the rockers were moving. Since the two outside diagonal bolts were binding and therefore not torqued to spec, I don’t know if the LIM is going to hold up. I wonder if the previous attempt failed for the same reason. Finding a torquewrench in inch lbs to rent was also not doable so I had to buy one for seventy bucks from Sears.

    Now on to putting the rest together, figuring out this ball of spaghetti of wires and plugs, installing the CV joints and crossing my fingers.

  • #2
    Crows foot and a extension allows for the use of a torque wrench for those side bolts. The wires are simple, as for the ignition wires, just label them so you dont have to think too much in the end.
    Slide the lim in from the drivers side and down seems to work without binding anything up.

    Lifting my front wheels, one jack at a time.

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    • #3
      crow's foot is good, but i use these a 1/4'' 10mm swivel socket.

      top 4 bolts need to be snugged, then snug the diagnal's, then torque the top 4, and then diagnal 4. rocker arms if u have 96 up 3400 or late 99 3100's, then they are self adjusting rockers, just tighten. otherwise buy one of these for $15 and save even removing the rockers to get the pushrods out.

      you just need to be patient when doing engine repairs for the first few times..
      [SIGPIC]
      12.268@117... 11's to come!
      turbo 3400: 358whp and 365tq at 9 psi
      ASE Master Technician. GM Certified.
      http://www.youtube.com/watch?v=7ibU1k8UZoo
      http://www.youtube.com/watch?v=GUqJyopd720

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      • #4
        don't let the wiring get to you. you can't miss-plug anything. each connector will only plug into the one thing it was designed for. pretty cool. i didn't have any problems installing the pushrods. not sure as to why you did.
        Andy

        sigpic

        fastest 1/8: 10.19@ 67.17
        fastest 1/4: 16.16@ 82.70

        62mm TB, 1.6 roller tip rockers, Ostrich 2.0, UD pulley, TB heater bypass, K&N, 180* stat, No cat, 99Grand AM dual cooling fans. 4T65E swap FDR 3.69, EP LSD, F.A.S.T. transmission controller, TransGo shift kit.

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        • #5
          Originally posted by torq455 View Post
          don't let the wiring get to you. you can't miss-plug anything. each connector will only plug into the one thing it was designed for. pretty cool. i didn't have any problems installing the pushrods. not sure as to why you did.
          It was the first time I'd ever done a 60 degree motor like this. Normally they just drop in I had to feel around to make sure they dropped in. I know they did, just didn't feel like what I was used to.

          I'm working on this thing every chance I get, sometimes only an hour here and there. I've got some of the easy connections, some I'm not so sure about yet.

          What's scary is I don't even know if she'll start when it's all done.

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          • #6
            Originally posted by MidnightriderZ24 View Post
            crow's foot is good, but i use these a 1/4'' 10mm swivel socket.

            top 4 bolts need to be snugged, then snug the diagnal's, then torque the top 4, and then diagnal 4. rocker arms if u have 96 up 3400 or late 99 3100's, then they are self adjusting rockers, just tighten. otherwise buy one of these for $15 and save even removing the rockers to get the pushrods out.

            you just need to be patient when doing engine repairs for the first few times..
            I did the top four, then the diagonals like you explained, but for some reason the two diagonals (upper right and lower left) were really tight going in, even with a crow's foot and an a box end 10mm wrench. I don't know why. I should have set the LIM in there before all the gaskets and RTV and run all the bolts in as a "trial run". I cleaned all the bolts and chased all the threads beforehand. I'll know soon if it worked.

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