Engine Vibration.

Discussion in 'The "X" bodies' started by Androzer, Aug 2, 2018.

  1. Androzer

    Androzer Member

    Hello, I have Apollo 1974 V8 350.
    The engine has a vibration and i can feel it in the whole car and in my steering wheel.
    I changed the Harmonic Balancer and used 1977 Regal. even it looks differ than the one originally was in the car, the vibration still. People started to tell me each Fly wheel has its special Harmonic balancer.
    and some of them said it is from the Torque convertor.
    I am from Syria. Is that true that each that fly wheels has different Harmonic balancers?
  2. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    The harmonic balancers are the same. Some have some weight in the holes, some don't. You can transfer the weight from your original balancer to the new one. I would look at your flex plate. If it is wrong for the engine, it can cause the kind of vibration you are experiencing. Years ago, I had a transmission shop replace my cracked flex plate on my 1972 Skylark 350. The engine vibrated and I took it back to the shop. I don't remember why the flex plate was wrong, but they acknowledged it and replaced it with the correct one.

    If you suspect the torque converter, unbolt it from the flexplate and push it back. Then run the engine and see if the vibration is still there.

    There is a procedure for correcting engine balance in every Buick Chassis Manual. They all describe the same procedure. Might be worth a try. Here is a page from the 1972 Buick Chassis manual. The procedure is the same for all 68-76 350 and 455 Buick engines.

    Last edited: Aug 2, 2018
  3. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

  4. BuickV8Mike

    BuickV8Mike SD Buick Fan

    You feel it when driving?
  5. Androzer

    Androzer Member

    It is obvious more on low RPM, on High RPM or on acceleration it feels just like obvious Tingling.
    so y there is several types of Harmonic balancers on the market for Buick with several shapes for 350 engine! I am afraid I took the regal 77 one and gave him mine is a mistake!
  6. Androzer

    Androzer Member

    Hello, I went under the car and removed the Toureq converter bolts, the three bolts. the car is still vibrating on low RPM
    I mean on Idle. so it is not from the Toureq converter, nor from the harmonic balancer. what we have left is the Flywheel and what?
  7. partsrparts

    partsrparts Silver Level contributor

    check your motor mounts and look to see if any part of the engine is touching the frame, like exhaust manifolds. When i put my motor in( 350 in place of a v6 using the v6 mounts because 350 mounts wont work with v6 frame pads), the drivers side header was sitting on the motor mount and pass side was sitting on upper control arm through bolt and had a bad vibration.
  8. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Did you check your firing order? Make sure you don't have 2 plug wires crossed. 1-8-4-3-6-5-7-2, clockwise distributor location, Drivers side cylinders are 1-3-5-7 front to back and passenger side is 2-4-6-8.

    Next is a compression check. Make sure you don't have 1 or 2 dead cylinders. That will cause a vibration.
  9. BadBrad

    BadBrad Got 4-speed?

    How's that transmission output bushing/seal looking? Speaking from experience here.
  10. Androzer

    Androzer Member

    Ok!. One last question is it possible to change the Flex Plate without removing the transmission bolts??
  11. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    No, transmission has to come back.

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