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Thread: 6.2l Diesel Bad Vibration at Idle

  1. #1
    Join Date
    Apr 2020
    Location
    Texas
    Posts
    2

    Default 6.2l Diesel Bad Vibration at Idle

    Hi there, I have a 1983 K10 with a 6.2 and a 700r4. I recently did an oil change and replaced the worn out bushing mounts for the transmission/ transfer case. I started it up when I was done and after it warmed up I noticed a bad vibration shaking the entire truck. When I press the accelerator it smooths and I notice no bad vibration. This happens in drive,park,neutral, and reverse. I have checked/replaced the following:

    1. Obvious culprit the harmonic balancer, I replaced this with an AC Delco April 2019, the rubber is bulged out about a little bit, but I see no cracks or other obvious failures.
    2. Checked Injector, PO replaced them about 13K miles ago. Cracked each line at injector and engine stumbled on each one.
    3. No metal or any contaminants in the old oil, I change it about every 5K miles.
    4. All pulleys appear to be straight no wobble when running.
    5. Transmission has fluid and shows no signs of damage.

    What else should I check? I have a new balancer on order just in case, but I don't know where else to look. I've talked with a transmission shop, and he doesn't think it's the transmission because it goes away when accelerating.
    Thanks for reading hopefully one of you can help me solve this problem.

  2. #2
    Join Date
    Jan 2001
    Location
    New Hampshire - Live Free or Die
    Posts
    6,057

    Default

    Did the problem start when you changed the mounts?
    The Constitution needs to be re-read, not re-written!

    If you can't handle Dr. Seuss, how will you handle real life?

    Current oil burners: MB GLK250 BlueTEC, John Deere X758
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  3. #3
    Join Date
    Apr 2020
    Location
    Texas
    Posts
    2

    Default

    Yes, right after.

  4. #4
    Join Date
    Mar 2000
    Location
    South Central Pennsylvania, USA
    Posts
    2,697

    Default

    You changed the trans/t-case mounts. Have you looked at the engine mounts?
    '94 GMC 6.5TD K1500 4L80E 2-Door Yukon SLE 221K
    '93 Chevrolet 6.5TD K2500HD NV4500 Std. Cab Longbed 187K
    '85 Toyota 22R RN60 4x4 Std. Cab Shortbed 178K (Currently retired for rebuild)
    Diesel Page Member #2423

  5. #5
    Join Date
    Oct 2021
    Location
    Houston
    Posts
    1

    Default

    Did you figure it out??

    I have a very similar problem. Changed balancer no help. Also vibration seems to get worse as motor warms up. I have not Changed any mounts.

  6. #6
    Join Date
    Apr 2001
    Location
    Newberg Oregon
    Posts
    12,282

    Default

    Open the hood and watch the AC belt while the engine is at idle.

    The center span will likely be vibrating a lot.

    This is the noise.
    (1) 1995 Suburban 2500 4x4
    (1) 1997 Astro
    (1) 2005 Suburban (Papa Smurf)
    THIS IS BOW TIE COUNTRY

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