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Flywheel Timing Marks

Discussion in 'Early CJ5 and CJ6 Tech' started by kenb, Jan 10, 2020.

  1. Jan 10, 2020
    kenb

    kenb Cleverly disguised as a responsible adult

    Detroit
    Joined:
    Jan 22, 2019
    Messages:
    670
    Hello,
    I have this flywheel off a '64 CJ5 F134 engine. I suspect it's original to the year since the flywheel is drilled for the 9-1/4" clutch. I noticed these timing marks on the side of the flywheel facing the engine. The service manual I have doesn't discuss their use as far as I can find. Can anyone enlighten me?
    Thanks,
    Ken
    Resized_20200110_125227.jpeg
     
  2. Jan 10, 2020
    ITLKSEZ

    ITLKSEZ Hope for the best, prepare for the worst

    Liberty Lake, WA
    Joined:
    Aug 13, 2015
    Messages:
    6,656
    The militaries and early flatties had a peephole through the bellhousing cover to check timing.

    Found this:
    “The CJ2A and CJ3A retained the flywheel timing marks and the window. The M38 went to the late bell housing and large frame starter with front pulley timing marks in May 1952. The CJ's made the switch with the CJ3B.”
     
    Tom_Hartz likes this.
  3. Jan 11, 2020
    kenb

    kenb Cleverly disguised as a responsible adult

    Detroit
    Joined:
    Jan 22, 2019
    Messages:
    670
    Interesting, thanks. They must have used an older flywheel when they put this engine together.
     
  4. Jan 11, 2020
    Keys5a

    Keys5a Sponsor

    Florida Keys
    Joined:
    Jan 23, 2014
    Messages:
    4,170
    Willys also had a 6 cyl 161 F head (early 1950s) that used the larger clutch and has the timing window on the passenger side of the bellhousing around the 9 o'clock position (passenger side) as you view the engine from the front. I'll bet that is what your flywheel is from. I used to work on a 1950 VJ Jeepster that had the 161 Fhead in it that had your flywheel.
    My '64 Tux has the large clutch, but no timing marks like yours.
    -Donny
     
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