1. Registration trouble? Please use the "Contact Us" link at the bottom right corner of the page and your issue will be resolved.
    Dismiss Notice

1984 258 Rocker Arm Torque Spec/procedure?

Discussion in 'Intermediate CJ-5/6/7/8' started by Iandavidh, Aug 5, 2021.

  1. Aug 5, 2021
    Iandavidh

    Iandavidh Member

    California
    Joined:
    Sep 24, 2018
    Messages:
    398
    Hey all I just wanted to verify this before I go and dive into it. When I had my valve cover off I noticed the rockers were a bit loose. I didn’t do anything to it at the time and just tossed a new valve cover gasket on. The top end is a little noisier than I’d like but not horrible for a 258 lol.

    So what I’ve been reading is to torque the rocker arm bolts down to 19-22 regardless of cam position?
     
  2. Aug 5, 2021
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
    Joined:
    Aug 10, 2003
    Messages:
    23,596
  3. Aug 5, 2021
    Fireball

    Fireball Well-Known Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Pullman, WA
    Joined:
    Feb 9, 2018
    Messages:
    5,719
    Since it was sitting for a long time, the lifters probably all bled down. It should quiet up pretty quickly when running if so. I always torque the rockers on the base circle with the valve closed to make sure the valve spring isn't interfering with the torque reading.
     
    Last edited: Aug 5, 2021
  4. Aug 5, 2021
    Iandavidh

    Iandavidh Member

    California
    Joined:
    Sep 24, 2018
    Messages:
    398
    I’ve got the 73 manual I wasn’t sure if there would be a difference between the years
     
  5. Aug 5, 2021
    Iandavidh

    Iandavidh Member

    California
    Joined:
    Sep 24, 2018
    Messages:
    398
    I’ve had it running/driving a little bit already. It was already a little noisy before I tore the Jeep down.

    How do I get base circle with the valve closed?
     
  6. Aug 5, 2021
    Fireball

    Fireball Well-Known Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Pullman, WA
    Joined:
    Feb 9, 2018
    Messages:
    5,719
    Turn the motor with a wrench on the front or with a remote starter switch (https://www.amazon.com/INNOVA-3630-Remote-Starter-Switch/dp/B000EVU8MK). Watch the rockers for the cylinder you're working on. Wait until the exhaust opens and closes and then the intake opens and closes. Then turn it a little bit more. This will ensure you're on the compression stroke and both valves are closed. Torque both rockers for that cylinder. Repeat for all cylinders.
     
    Iandavidh likes this.
  7. Aug 5, 2021
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
    Joined:
    Aug 10, 2003
    Messages:
    23,596
    Likely will be. I recall the 258 rocker design changed at least once, maybe twice in the '72-73-74 era. I would definitely look to the TSM of the same era as the engine. The '84 TSM is not online and expensive, so the '82 version will be the next best option. There was a major revision of these engines in 1981, though I believe the rocker design was not affected (all rocker-stud-type after the mid-70s).

    Also realize that you can mix and match between different years, so the head casting number should be consistent with whatever the donor was.
    What years are my engineblock & head
     
    Last edited: Aug 5, 2021
    Iandavidh likes this.
  8. Aug 5, 2021
    Iandavidh

    Iandavidh Member

    California
    Joined:
    Sep 24, 2018
    Messages:
    398
    Awesome thank you
     
    Fireball likes this.
  9. Aug 5, 2021
    Iandavidh

    Iandavidh Member

    California
    Joined:
    Sep 24, 2018
    Messages:
    398
    I went down the line and checked all the torque and they were all tight already. There’s still the looseness to them but I’m chalking it up to worn parts now.
     
    Fireball likes this.
New Posts