classic motorcycle forum

Motorcycle Discussions => British Bikes => Topic started by: stevethon on May 23, 2008, 10:44:35 PM

Title: Cylinder head torque
Post by: stevethon on May 23, 2008, 10:44:35 PM

Does anyone know where I can get an attatchment for a torque wrench in order to torque my barrels.It's for a 69 t100 so you know the problem of not being able to get a normal socket in because of the fins.(I think it's 1/4 whitworth). ???
Thanks

Title: Re: Cylinder head torque
Post by: TBS on May 24, 2008, 04:14:08 AM

Actually Triumph never torqued the barrell nuts, I just tighten them evenly all round , put the motor through a heat cycle, let cool over night and re-tighten, keep doing this 'till they stop moving.

Title: Re: Cylinder head torque
Post by: stevethon on May 24, 2008, 09:06:06 AM

Cheers for that.I'll give it a go over the weekend. ::)

Title: Re: Cylinder head torque
Post by: Helix on May 26, 2008, 09:34:55 AM

Head bolts/nuts are all fine threads and shouldn't be over-tightened; use a ring spanner and pull with your little finger in the opposite end.  This way you get even tension with minimal risk of stripping.

Helix

Title: Re: Cylinder barrel torque
Post by: stevethon on May 27, 2008, 07:19:41 PM

Hi there,
Thanks for your reply but I should state the job is securing the barrels to the engine casings, not the head (my fault due to subject heading).Would you still use the same method?i.e. no torque? ???

Title: Re: Cylinder head torque
Post by: TBS on May 27, 2008, 08:22:40 PM

They need to be tight, so pull down evenly and quite hard.

Title: Re: Cylinder barrel torque
Post by: Blue on May 28, 2008, 10:17:01 PM

Quote

Hi there,
Thanks for your reply but I should state the job is securing the barrels to the engine casings, not the head (my fault due to subject heading).Would you still use the same method?i.e. no torque? ???

I think that everyone has guessed this is what you meant.  Just to clarify however:
You do NOT need a torque wrench for the barrel flange/crankcase joint.  Follow TBS and Helix' instruction.
You DO need a torque wrench for the barrel/cylinder head joint.  18 ft/lbs is the standard for 8-stud heads, but you'd be best to double check with model-specific data.

Blue

P.S. When tightening the cylinder barrel-flange to the crankcases, tighten them in a similar sequence as the head - i.e. in a criss-cross pattern across the crankcase mouth

Title: Re: Cylinder head torque
Post by: stevethon on May 28, 2008, 11:28:14 PM

Head and Barrels are now back on as advised,all seems to be fine with no leaks.Thanks for the help everyone. ;D