Author Topic: a65 cyl. head outer nuts  (Read 177 times)

0 Members and 1 Guest are viewing this topic.

Taffyboy

  • Star
  • *
  • Posts: 9
    • View Profile
a65 cyl. head outer nuts
« on: 23 October, 2020, 20:59:08 »
Is there a tool out there to gain access to the head outer nuts on an a65 when torquing? Cant seem to find nowt. I recall a tool to adjust ford ohc Pinto engine tappets, which from memory, appear the right shape ie 90 degree bend at both ends. 3/8" drive one end, but cant remember the A/f size on the spanner end.  :-\

Nanonevol

  • Star
  • *
  • Posts: 49
    • View Profile
Re: a65 cyl. head outer nuts
« Reply #1 on: 23 October, 2020, 22:51:57 »
I use a 13 mm crowfoot that fits a 3/8" drive.
It's close enough in size to fit.
« Last Edit: 23 October, 2020, 22:59:18 by Nanonevol »

chaz

  • Golden Flash
  • *****
  • Posts: 891
    • View Profile
Re: a65 cyl. head outer nuts
« Reply #2 on: 24 October, 2020, 07:28:38 »
when I first started working on BSA's there was a picture of a box spanner and a dimension to the centre of the 1/2 drive . this was dimensioned to allow leverage calculation for torquing.
nowadays having used spanners for 40 years, if needed I torque accessable nuts/bolts and get a feel for the rest using a spanner,

DAVE BRADY

  • Golden Flash
  • *****
  • Posts: 839
    • View Profile
Re: a65 cyl. head outer nuts
« Reply #3 on: 24 October, 2020, 09:00:13 »
Hi,

There is a thread about this so a search of this forum may help.  What I do is find a ring spanner that fits well rather than an open ended one, and has a 1/2" on the other end.  Put the spanner on the nut and set the torque wrench in the other end but set at 90 to the spanner.  The 90 is important as this means that the torque on the nut is correct. Pull on the torque wrench as normal.  At the required torque an ill fitting spanner will damage the nuts.

There are plenty of 'crows foot' adapters available but they all seem to be open ended and it is quite tight getting the spanner on properly hence use a ring spanner.  Even then it may be necessary to grind it down a bit to get it on properly.
 
Dave.
« Last Edit: 24 October, 2020, 09:15:47 by DAVE BRADY »

JulianS

  • Empire Star
  • *****
  • Posts: 2038
  • A10
    • View Profile
Re: a65 cyl. head outer nuts
« Reply #4 on: 24 October, 2020, 10:03:34 »
This from the BSA service sheets.

Taffyboy

  • Star
  • *
  • Posts: 9
    • View Profile
Re: a65 cyl. head outer nuts
« Reply #5 on: 24 October, 2020, 11:36:30 »
Just find it unbelievable that bsa themselves, did'nt have a have a tool to buy of the shelf for this. After all, a vital part of any re build. Anyroad, thanks to all for the replies chaps.

Mike Farmer

  • Golden Flash
  • *****
  • Posts: 1418
    • View Profile
Re: a65 cyl. head outer nuts
« Reply #6 on: 24 October, 2020, 12:40:55 »
 :) :) :)

Hi

I think that formula should read  12" +  3"  =  15.

Mike 8) 8) 8) 8)

chaz

  • Golden Flash
  • *****
  • Posts: 891
    • View Profile
Re: a65 cyl. head outer nuts
« Reply #7 on: 24 October, 2020, 13:26:33 »
Julian
thats the one I saw years ago, thanks

Nanonevol

  • Star
  • *
  • Posts: 49
    • View Profile
Re: a65 cyl. head outer nuts
« Reply #8 on: 24 October, 2020, 18:40:39 »
Sorry that should be a 15 mm crows foot above.  Very close to the 5/16 Whitworth nut on the BSA head.

Greenfield

  • Royal Star
  • ***
  • Posts: 123
    • View Profile
Re: a65 cyl. head outer nuts
« Reply #9 on: 27 October, 2020, 19:38:59 »
Using Dave's system its very important that the spanner and torque wrench are fixed at 90' and that the pull on the torque wrench is at 90'. If you pull more in the direction of the rotating head nut which is more natural, it gets a lot more complicated with the length of the spanner now having an effect, and you will probably apply more pressure and thus produce a reduced tightness.