Truckers Report Jobs

Find Trucking Jobs

Company Driver Company Driver Dry Van Dry Van Flatbed Flatbed Refrigerated Refrigerated Specialized Specialized Owner Operator Owner Operator
More Trucking Job Searches ⌄ Fewer Trucking Job Searches
⌃

Crankshaft question

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by petefan4000, Jan 13, 2021.

  1. Jan 13, 2021 #1
    petefan4000

    petefan4000 Light Load Member

    107
    129
    Dec 2, 2020
    Michigan
    0
    I've mostly been interested in Caterpillar engines but it seems that Cummins, Detroit, and John Deere have all done the same thing. Specifically, I've noticed that on most straight 6 engines, cylinders 2 and 5 don't have counterweights, and it seems like that they make up for this by offsetting the counterweights on cylinders 1, 3, 4, and 6 by 30° to compensate for that. Anyone know why they don't have crank weights on all 6 cylinders?
     
    petefan4000, Jan 13, 2021
    petefan4000, Jan 13, 2021
    #1
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  3. Jan 13, 2021 #3
    Lazer

    Lazer Road Train Member

    1,388
    2,167
    Jan 22, 2017
    0
    My guess would be 4 is all that’s needed?
    And why spend the $ on 6, if 4 does the job?
     
    Lazer, Jan 13, 2021
    Lazer, Jan 13, 2021
    #3
  4. Jan 13, 2021 #3
    mnmover

    mnmover Road Train Member

    1,237
    1,103
    Apr 5, 2009
    Lichfield MN
    0
    The front of the crank should have a torsional balancer that needs replacement after 500,000 miles. The one that does it differently is the Volvo engine where the balancer is in the middle of the crankshaft and the motor must be torn down to replace it.
     
    mnmover, Jan 13, 2021
    mnmover, Jan 13, 2021
    #3
    A5¢ Thanks this.
  5. Jan 13, 2021 #4
    Goodysnap

    Goodysnap Road Train Member

    3,500
    8,375
    Jul 12, 2017
    0
    Everyone is trying to shave weight to meet fuel economy /EPA standards. Paccar MX uses No counterweights.

    Hollow camshafts too, tubes with assembled lobes.
     
    Last edited: Jan 13, 2021
    Goodysnap, Jan 13, 2021
    Goodysnap, Jan 13, 2021
    #4
    A5¢, pushbroom, spsauerland and 2 others Thank this.
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.