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Tappet adjustment on F-134

Discussion in 'Early CJ5 and CJ6 Tech' started by Bill67cj5, Jan 9, 2016.

  1. Bill67cj5

    Bill67cj5 Member

    Had some knocking going on so decided to adjust intake and exhaust tappets/valves last weekend. Went through the whole procedure (you tube Hanibal 16577: 2 great videos on how to do correctly). Checked and double checked the gap at .016 exhaust and .018 intake and then put all back together w new gaskets, etc. started her back up and lo and behold, a little noiser than before at a little higher pitch. Went for a ride and also seems to be idling at higher rpm. Haven't put a tach on it yet but will this weekend.
    So, ideas on: a. Why noiser? And b. Why rpm higher?
    Thanks guys for your help.
    Bill
    67CJ5
     
    Bill67cj5, Jan 9, 2016
    #1
  2. 47v6

    47v6 junk wrecker! 2023 Sponsor 2022 Sponsor

    When I built my Fhead, it always made a lot of valve train noise. I adjusted the tappets many times and I never got the noise to go away. I had never heard an Fhead run before I did it, so I assumed that it was either something I did wrong, something wore out or they just made valve train noise. I am sorry I cannot answer your question, maybe someone else can and at the same time maybe elucidate me on my own similar issue.
     
    47v6, Jan 9, 2016
    #2
  3. Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    I'm having the same issue, after adjusting the valves I actually pulled the oil pan to make sure it wasn't excess clearance on a rod bearing.

    I can live with it but it's annoying. I've been told it could be related to a weak valve spring.

    H.
     
    Howard Eisenhauer, Jan 9, 2016
    #3
  4. Glenn

    Glenn Kinda grumpy old man Staff Member

    To me it seems backwards that the intake valves need a higher clearance than the exhaust. I've got the same noise complaints too. :confused:
     
    Glenn, Jan 9, 2016
    #4
  5. Glenn

    Glenn Kinda grumpy old man Staff Member

    Since you would have had to disconnect accelerator linkage to get the valve cover off I would at first suspect something going on with that.....maybe binding or return spring not as tight so not pulling linkage all the way back?
     
    Glenn, Jan 9, 2016
    #5