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Thread: Buick Regal 3800 SC timing chain

  1. #1
    Supporting Member II Turbo Mopar Contributor iTurbo's Avatar
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    Buick Regal 3800 SC timing chain

    Hey guys, I'm going to be replacing the timing set (chain/sprockets) on my '98 Buick Regal GS soon. It has the L67 engine (3800 S/C). The car runs great and there are no apparent problems with the timing set, but I want to install a set of ZZP 1.9 rocker arms and LS6 valve springs/retainers for more power. I'm hesitant to do those mods with the original timing chain because of the increased load it will put on the chain.

    I have the tools to remove the harmonic balancer, but I am hesitant to put my impact driver on the center bolt to remove/replace it. Could this damage the main bearings? I have seen videos of people using an impact on the bolt, or using a breaker bar and the car's starter motor to remove it. I depend on the car for my job so I'm a little nervous about potentially breaking something if I ham-fist it. I'm not really sure what the 'correct' method is for this bolt. I was even considering using a large strap wrench (and two people), which should also allow me to torque it back to spec. Although I also wonder if that would damage the elastomer ring in the balancer.
    87 Shelby Lancer #127
    91 Dodge Spirit R/T
    08 Dodge Caliber SRT-4
    86 Dodge Omni GLH Turbo

  2. #2
    Supporting Member Turbo Mopar Contributor
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    Re: Buick Regal 3800 SC timing chain

    i've done the breaker bar/starter motor once and used an impact several times for removal. i would not ever use an impact to replace it. tell me how i know what happens when you think you have the impact on lowest setting and actually have it on highest setting when reinstalling the crank pulley...................
    89 Voyager LE, 2.5T2 - rest in peace
    87 Charger Shelby T2 (2.4 conversion in process)

  3. #3
    turbo addict
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    Re: Buick Regal 3800 SC timing chain

    Jeremy aren't those engines famous for balancer's going bad? I seem to remember that. The impact is fine for removal. Tighten with torque wrench. I replace timing belts all the time on import stuff. Toyota's and Honda's are unbelievably tight many times. I've used 1250lbs/ft 3/4" impacts that wouldn't remove that bolt sometimes. I fear the bolt breaking off in crankshaft someday. I know people use the starter motor, but this would be a Hail Mary, last resort for me...
    Todd
    Last edited by 4 l-bodies; 10-20-2020 at 01:15 AM.

  4. #4
    Supporting Member II Turbo Mopar Contributor iTurbo's Avatar
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    Re: Buick Regal 3800 SC timing chain

    Hi Todd, yeah it seems there are quite a few videos on YouTube of balancer replacement videos for the 3800. Mine seems OK though. Good to know that I can at least use an impact to remove it. I found a thread on a GM W-body forum where a guy removed a flex plate inspection cover and used a vice grip to pinch it to keep the engine from rotating, so hopefully that will work. Looks like the torque spec for it is 111 ft/lbs + 76 degrees and I may buy a new bolt if its really stubborn coming off.
    87 Shelby Lancer #127
    91 Dodge Spirit R/T
    08 Dodge Caliber SRT-4
    86 Dodge Omni GLH Turbo

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