1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Cylinder head and cylinder Torque check.

Discussion in 'Norton Motorcycles (Modern)' started by Voodooo, Jun 9, 2019.

  1. Voodooo

    Voodooo VIP MEMBER

    Joined:
    Aug 10, 2016
    CAD46EE1-6BE1-40F3-A0AF-CC42089A6079.jpeg I notice I have a “small” amount of oil seeping between the cylinder head and cylinder gasket on my commando. I only have 380 miles on the bike.

    I’m going to check the torque on the head, do any of you also check the torque on the lower 5 front cylinder bolts when doing head torque check?
     
    TonyA likes this.
  2. Eljahara

    Eljahara VIP MEMBER

    Joined:
    Jul 8, 2018
    The workshop manual indicates 25nm for the barrel bolts but in a specific order - numerically from 16 to 20
    The bolts are numbered (from left to right looking towards the back of the bike)
    20 18 16 17 19
    John

    63B1A3BA-774B-4C06-B0AD-BC17CC73201F.jpeg
     
  3. TonyA

    TonyA VIP MEMBER

    Joined:
    Jan 16, 2015
    WOW , Your bike is clean Bro ! I just put a wrench and nip them up. Definitely do the head torque now Bro ! Also don't forget about the exhaust gasket leaks on the head pipes. May need a second gasket and a re-torque there too.
     
    Last edited: Jun 11, 2019
  4. richard-7

    richard-7

    Joined:
    Feb 24, 2014
    I'm certain you received this info from me in one of my emails I sent out with manuals. But here it is again.

    All of the bolts need to be torqued. The numbers are the order of which you do them. It's confusing because their are two numbers on some of them. Like 1/7. This means you are going to torque it twice. The first time and the seventh time. So on that bolt you torque it to 22ft lbs (30Nm) then the seventh time to 44 ft lbs (60Nm),. Hope this makes sense.
    Torque One to Six to 30Nm. Torque Seven to Twelve to 60Nm, then torque thirteen to fifteen to 30Nm
    If you get the WEB version of the service manual, the torque specs are wrong. Only the paper version is correct. Above are the correct values.
     
  5. Voodooo

    Voodooo VIP MEMBER

    Joined:
    Aug 10, 2016
    I’ve already replaced the header gaskets. My headers had some stains on them so I removed them to polish them. That’s when I noticed the minor oil from the head gasket.
     
    TonyA likes this.
  6. Voodooo

    Voodooo VIP MEMBER

    Joined:
    Aug 10, 2016
    Correct. I’m aware of the torque spec and order. I just didn’t recall anyone mentioning the cylinder torque check. I appreciate all your help from everyone.
     
    richard-7 likes this.
  7. TonyA

    TonyA VIP MEMBER

    Joined:
    Jan 16, 2015
    Sometimes 2 gaskets per port work best.
     
  8. Voodooo

    Voodooo VIP MEMBER

    Joined:
    Aug 10, 2016
    Sounds good.
    I have extras. I’ll add another.
     
  9. Voodooo

    Voodooo VIP MEMBER

    Joined:
    Aug 10, 2016
    I torqued my heads on both bikes today. I can’t believe they required 1 to 1-3/4 turns to reach spec torque values.
    I did the torque sequence as shown and did them is 4 steps.

    Anyone else get that many turns?
     
    Britfan60 likes this.
  10. MxMartin

    MxMartin

    Joined:
    Nov 13, 2017
    Almost 2 threads??? Wow! No not even checked mine, it has had 2 dealer services so I would expect them to have been checked?
     
  11. Voodooo

    Voodooo VIP MEMBER

    Joined:
    Aug 10, 2016
    2 of the 4 Acorn nuts were below 30 Nm. First I torqued them to 30 Nm in the sequence shown in the shop manual then finished at 60 Nm.
     
  12. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    You’re lucky you don’t blow the head gasket !
     
    Voodooo likes this.
  13. TonyA

    TonyA VIP MEMBER

    Joined:
    Jan 16, 2015
    Yes , especially the left hand side needed the most turns for me . L/H acorn nuts . But i still have to say your bikes are clean guy !
     
    Last edited: Sep 1, 2019
  14. Voodooo

    Voodooo VIP MEMBER

    Joined:
    Aug 10, 2016
    My left side was looser than the right side as well. Lol thanks for the compliments.
     

Share This Page