Results 1 to 7 of 7

Thread: timing belt broke, replaced ,now i have a vibration

  1. #1

    Array
    Status
    Offline
    Join Date
    11-07-2014
    Posts
    6
    Location

    belding,mi
    Vehicle

    1991 Dodge Ram 50
    Engine

    4G61

    timing belt broke, replaced ,now i have a vibration

    I have a 91 ram 50, 2.4l, it has 80,000 miles on it.
    the timing belt broke while driving it yesterday,I relaced the belt. now while running it has a vibration that was not there before.
    I am sure the timing marks were lined up properly when the belt went on. the balance shaft pulley felt ok, do you think when the
    belt broke, the balance shaft could have broke??? can you think of another cause? please help. thanks

  2. #2




    Array
    Status
    Offline
    Join Date
    03-20-2011
    Posts
    4,851
    Location

    Pittsburgh, PA
    Vehicle

    1980 Dodge D-50
    Engine

    G54B
    It only takes the balance shaft belt to be off 1 tooth to get a vibration from the motor. Check the balance belt timing - it is usually good practice to replace the tensioner pulleys and the balance shaft belt at the same time to prevent future issues. Most people replace the water pump too, but you may be able to wait on it as you have such low miles. Welcome to the forum.
    Last edited by pennyman1; 11-07-2014 at 05:13 PM.
    Pennyman1
    The best Dodge that Dodge never made
    Living the D-50 lifestyle since 1980

  3. #3

    Array
    Status
    Offline
    Join Date
    11-07-2014
    Posts
    6
    Location

    belding,mi
    Vehicle

    1991 Dodge Ram 50
    Engine

    4G61
    balance belt timing? balance shaft belt? I thought the balance shaft was turned by the timing belt. sorry if i am being dumb.
    please explain it to me.

  4. #4


    Array
    Status
    Offline
    Join Date
    01-16-2014
    Posts
    464
    Location

    Las Vegas, NV
    Vehicle

    1991 Mitsubishi Mighty Max
    Engine

    4G64
    I was going to suggest the same as what Pennyman1 wrote.

    One shaft is turned by the main belt, the other is turned by its own belt. It's a smaller belt that sits behind the timing belt and loops over to the passenger side of the engine. Your timing belt kit should have included the balance shaft belt. It's a smaller belt.

    The main timing belt has 3 marks to line up - crank, cam, and oil pump (which drives the other balance shaft). All 3 have reference marks on them.

  5. #5



    Array
    Status
    Offline
    Join Date
    07-24-2012
    Posts
    2,363
    Location

    Washington State
    Vehicle

    1986 Mitsubishi Mighty Max
    Engine

    G63B
    Those shafts also have a weird way to set them. When installing a belt, hand spin the sprocket softly and it will teder todder around on its own from the counter weights. Kind of weird the way it rolls itself into the correct position on it's own weights. Just get everything set and balance shafts and then double check the shafts by slowly turning until it gravity rolls itself closely to the timing mark arrow, might be off a tiny bit, just do the rest by hand to point it exactly at the mark and install belt. I never knew this for a long time, I guess I just got lucky in the past.


    Here is a demonstration on youtube that clears up my confusion. They use an EVO, but they are basically exactly the same motor.
    http://www.youtube.com/watch?v=1NUBy-Q3djg

  6. #6

    Array
    Status
    Offline
    Join Date
    12-15-2021
    Posts
    6
    Location

    mexico
    Vehicle

    1993 Mitsubishi Mighty Max
    Engine

    4G64
    Does the small sprocket on the small belt also need to be balanced or just the oil pump?

  7. #7

    Array
    Status
    Offline
    Join Date
    06-15-2014
    Posts
    6,059
    Location

    Adelaide, South Australia
    Vehicle

    1985 Mitsubishi L200
    Engine

    G63B
    Both shafts need to be timed. There is an alignment dimple stamped onto the face of the counter balance shaft sprocket. You can also check the shaft timing by removing the inspection bolt on the side of the block and inserting a screwdriver into the shaft journal.
    support the forum that supports you - join and donate to MightyRam50.Net today! donations unlock the edit function

Tags for this Thread

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •