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Pictures of head install procedure (2015)

Discussion in 'Norton Commando Motorcycles (Classic)' started by p400, Jul 2, 2015.

  1. p400

    p400 VIP MEMBER

    Joined:
    Jul 14, 2014
    I find several sequences - here is another


    TORQUE SETTINGS
    Cylinder head nuts and bolts (3/8 in.) :360 in./lb. 30 ft./lb. (4.15 Kg/m)
    Cylinder head bolts (5/16 in.): 240 in./lb. 20 ft./lb. (2.75 Kg/m)
    Cylinder base nuts (3/8 in.): 300 in./lb. 25 ft./lb. (3.45 Kg/m)
    Cylinder base nuts (5/16 in.): 240 in./lb. 20 ft./lb. (2.75 Kg/m)
    Connecting rod nuts: 300 in./lb. 25 ft./lb. (3.45 Kg/m)
    Rocker spindie cover plate bolt: 100 in./lb. 8 ft./lb. (1.11 Kg/m)
    Crankshaft nuts: 420 in./lb. 35 ft./lb. (4.84 Kg/m)
    Cam chain tensioner nuts: 180 in./lb. 1 5 ft./lb. (2 07 Kg/m)
    Oil pump stud nuts: 180 in./lb. 15 ft./lb. (2.07 Kg/m)
    Rocker feed banjo bolts: 180 in./lb. 15 ft./lb. (2.07 Kg/m)
     

    Attached Files:

  2. p400

    p400 VIP MEMBER

    Joined:
    Jul 14, 2014
    So a proper ring spanner torque wrench extension tool for Norton head torqueing is not available as standard fair?
    Too expensive to produce?
    no BSF or Whitworth available?
    can a MM metric substitute?
     

    Attached Files:

  3. p400

    p400 VIP MEMBER

    Joined:
    Jul 14, 2014
    The upward facing nuts on a Norton are all 1/4WW
    You can grind the ring end of a 1/4 ring/open spanner to fit these three nuts, use the open end with a 1/2 torque device as the open end 1/4 WW fits 1/2 SAE AF very well, keep at a right angle and achieve a decent torque value.
    from the internet a BMW site -
    http://home.jtan.com/~joe/KIAT/kiat_3.htm
    Torque extensions are sometimes required to tighten fasteners in locations where the torque wrench will not fit such as the drive shaft flange on older airheads. Figure 9c shows the extension I made for this purpose. To work correctly, one must understand how the position of the extension affects the torque as shown in Figure 10c. There is a formula for relating actual bolt torque to the wrench torque based on the length of the wrench and extension and the angle between the two. It is best to keep the two at right angles so the torque will be the same.
    [​IMG]
    [​IMG]
     
  4. Anonymous

    Anonymous Guest

    Need help with the sums?
    This app can be mighty helpful...
    Ta.
     
  5. pete.v

    pete.v

    Joined:
    Oct 31, 2009
    This is the sequence I have always used.
    I stripped out Number 1 and tapped it to 7/16-14 and torque the #1 to 35 ftlb.
     
  6. ashman

    ashman

    Joined:
    Jul 11, 2010
    In all the years of rebuilding Norton motors I have never used a torque wench on the upside down nuts, I just use a ring spanner and because they aren't torqued much (20lbs I think) I just go click when I think they are right, after 40 years of working on Nortons I have never had a head gasket leak, well maybe once when my motor first needed a rebuild after my young days of doing burnouts and flogging my motor , but haven't had a leak since, if my head gasket gets a light seep I just torque the head down but I only usualy retorue the head the second time after putting 500 to 700 miles after the rebuild.
    I did get a blown head gasket once but that was not using a copper head gasket, so now only use copper head gaskets on my rebuilds.

    Ashley
     
  7. CanukNortonNut

    CanukNortonNut

    Joined:
    Aug 8, 2005
    +1 on the first part.
    I stripped one also on my 73 850 Head...Doh!...its one of those three that come down that will get yeah. :shock:
    Cheers,
    Thomas
    CNN
     
  8. texasSlick

    texasSlick VIP MEMBER

    Joined:
    Jan 2, 2013
    From the second sentence, Hobot gives good advice when one does not have the manufacturers tightening sequence. As for the first sentence, I assume Hobot is referring to the sequence posted by P400 (the one in the pic that looks like a Norton head). That picture is published in My Norton Owners Manual .... the book that came with my Atlas. Presumably, that is the sequence they use to build them at the Norton Works. Unless one has very strong opinions to be contrary, It is prudent to defer to the manufacturer's info.

    Slick
     
  9. cyclegeezer

    cyclegeezer

    Joined:
    Jul 15, 2010
    Motion Pro has a device that lets you clamp a ring spanner and attach it to your torque wrench. It comes in handy for the base nuts too.
     
  10. CanukNortonNut

    CanukNortonNut

    Joined:
    Aug 8, 2005
    got a link? edited: found it...thanks http://www.motionpro.com/motorcycle/art ... h_adaptor/
    Cheers,
    Thomas
    CNN
     
  11. hobot

    hobot

    Joined:
    Oct 19, 2005
    Yep Commando manual has correct sequence and obvious enough I doubt anyone did it otherwise, expect at Norton where anything goes. I and ashley know your are not really a full Nortoneer till no though of torque wrench crosses you mind only measuring stretch where it matters most so the rest by pure mechanic proven confidence, just Norton factory practice. Best wishes on puzzling push rods while supporting head and not messing the gasket sealant. Keep in mind how thoughtless it is once rocker ends relieved.
     
  12. chaztuna

    chaztuna VIP MEMBER

    Joined:
    May 5, 2017
    Thought I would add my DIY torque extension. I made two of these [for small & large nuts]. I simply cut a socket in half. Drilled two holes into a piece of 1/4" cold rolled steel plate and welded the halves of the socket onto the plate. I then ground the edges down and ground the welds as needed to fit.

    [​IMG]
    [​IMG]

    I have a photo showing the "socket" side, but left it at the shop. I'll attach it tomorrow. I made these 36 or 37 years ago.

    Here is the 3rd photo

    [​IMG]

    Charlie
     
    Last edited: Apr 16, 2018
  13. Danno

    Danno

    Joined:
    Feb 7, 2010
    If you don't remove the rocker as suggested by Jim, you will be opening one of the valves against spring pressure when you bolt the head down. Make sure your pushrods are seated at the top and bottom when you do this. They seem to go in place at the bottom much easier than the top.
     
    Last edited: Apr 15, 2018
  14. Danno

    Danno

    Joined:
    Feb 7, 2010
    I've always used a ring spanner and a small ball peen hammer to tighten the 3 inverse nuts. You can feel them come to torque as the hammer bounces.

    When Ron Wood retired the Norton to campaign a Harley, he said the biggest difference was he had to get bigger hammers and he never owned an inch-and-a-quarter socket in his life.