Cylinder Head stud torque settings

[jon stead]

Got the cylinder head off at present to overhaul it. Does anybody know the torque setting for cylinder head studs?

[jon stead]

Got some bent valves, so going to renew all eight and fit new stem seals. Valve guides and seats look ok, just needs cleaning up and a light lap in.

[hairygit]

The guides may look okay, but check them for wear and movement when you get the new valves, last thing you want is to put it back together and find it burning oil or worse because of worn guides. Could be worth getting valve seats ground before lapping in new valves.

Sent from my X6pro using Tapatalk

[matthewmosse]

I would want to know how them valves got bent if it were my bike. I had a cb500 engine a few years ago that destroyed two camchain tensioners within a few thousand miles, having successfuly rebuilt many cb500 motors using the exact same procedures I'm doubtful it was my fitting or adjusting that was at fault, I still have the engine awaiting a strip down but anticipate something wrong in the bottom end. Lasso as has been said, double check the guides are not too worn or tight when fitting replacements, it's a royal pain if the valve sticks open if the clearances happen to be off by a bit.

[Bryanj]

Dont want to be rude but torque setting is in the manual that you need to do the rebuild correctly

[jon stead]

I have a Haynes manual, but wanted confirmation of the settings. I've seen different methods regarding the retightening, first method was in two stages, second method was one stage. Both methods started in the centre and worked diagonally outwards doing the centre, fwd and aft bolts, last.

[jon stead]

I've also found the workshop manual on sohc.net

It says 2.0 kg m - 2.2 kg m (19.6 Nm to 21.6 Nm)

[jon stead]

This from manual

[mike the bike]

The correct method is to tighten them until they shear off, then loosen them quarter of a turn.

[Trigger]

The correct method is to tighten them until they shear off, then loosen them quarter of a turn.

I wondered where I had been going wrong 

[jon stead]

Head's apart and I need new valve guides. :-(

DSS are only showing exh valve guide 12023324405, and this is out of stock. I don't see the inlet valve guides on DSS site. Does the inlet valve guide have a different part number to the exhaust one.

I am emailing a supplier in Germany, as we type, but in case this falls through, does anybody know where I could get the valve guides I need please?

1973 500 K2

[Trigger]

I have been reading some of your threads on this 500K2 and now I am wondering why you think you need valve guides ?
They are available from CMSNL.

[jon stead]

I have been reading some of your threads on this 500K2 and now I am wondering why you think you need valve guides ?
They are available from CMSNL.

Hi Trigger

Yes, you are right to wonder why I need new valve guides. I am embarrassed to admit that I bent the valves and cracked the guides when I replaced the cylinder cover after removing it to check the valve timing. I am not only embarrassed but so angry with myself to have made this schoolboy error.

Anyway, what is done is done, I've learned by an expensive mistake but my bike will only get better for it.

Thanks for the CMSNL info. What a great site. Do you know where they are based?

Edit: I see now that CMSNL must be the Dutch arm of CMS

[Bryanj]

There only is a dutch arm of CMS!!

[Trigger]

Yes, a very expensive error..
To put new guilds in the head needs to be very hot, going this job can create more problems.
1) Due to the amount of heat needed, it is best to re-grind the seats, as they may distort a little, they only need kissing if not pitted. (Grind the seats, these do not like being cut)
2) Due to the amount of heat needed, always check the flatness of the head after and re-face if needed.
3) Who ever carries out this work, make sure they know what they are doing.

On replacing rocker housing, all tappets out and use the elastic band trick.