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Subject: Newbie needs help with valve adjustment

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Tlawing    Posted 09-13-2020 at 20:28:14 [URL] [DELETE]        [Reply] [Email]  
  • Newbie needs help with valve adjustment
  • Would someone explain the procedure for adjusting valve tappets (These are adjustable). What I need is for someone to explain how to start with number 1 TDC. How do I know itís at TDC. Once number 1 intake and exhaust is checked or adjusted if needed then how do I find 2 TDC etc.
    I assume the check and adjustment would be at TDC. Correct me if Iím wrong.
    Thank you for any help.

    Bruce Dorsi    Posted 09-14-2020 at 04:58:28 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Newbie needs help with valve adjustment
  • The fool-proof way of adjusting valves is:

    Adjust the INTAKE valve while the Exhaust valve is fully raised.

    Adjust the EXHAUST valve while the Intake valve is fully raised.

    No need to find TDC or count rotations using this method.

    Tlawing    Posted 09-14-2020 at 19:56:36 [URL] [DELETE]        [Reply] [Email]  
  • Re: Newbie needs help with valve adjustment
  • Thanks for the info

    deanostoybox    Posted 09-13-2020 at 22:33:48 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Newbie needs help with valve adjustment
  • Helps if spark plugs are out. Both tappet covers off. Easy way to turn motor by hand (hand crank, socket and ratchet, extra tight fan belt, crescent wrench on PTO shaft, ...).

    Turn motor until you see #4 exhaust start to close. Turn slowly until #4 exhaust valve is almost closed and #4 intake is just starting to open. Stop. #4 is "on the rock" or at/near top dead center between intake and exhaust, and its "twin" #1 is at/near top dead center of compression stroke so both valves are as closed as they are going to get and #1 is ripe for adjusting both intake and exhaust.

    Now turn motor 1/2 revolution. #3 is on rock, #2 ripe for adjusting.

    Now turn motor 1/2 revolution. #1 is on rock, #4 ripe for adjusting.

    Now turn motor 1/2 revolution. #2 is on rock, #3 ripe for adjusting.

    Now turn motor 1/2 revolution. double check #1.

    Now turn motor 1/2 revolution. double check #2.

    Now turn motor 1/2 revolution. double check #4.

    Now turn motor 1/2 revolution. double check #3.

    If you made any tweaks while double checking, triple check:-)

    Note:
    If the tops of the adjusting screws are not flat, the actual lash may be more than your feeler gauge would indicate.

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