choosing a cam

[philthehill]

The valve seat angles are 45 degrees and as regards the size of cutter you need to use the largest cutter you can get into the combustion chamber as you need to cover the whole width of the valve seat.
For the inlet...............36mm (min).
For the exhaust...........32mm (min).
Phil

[julie4morris]

Well i have ported the head, cut and lapped in the valves, so the head it pretty much ready to go on.
But i have been fitting the Duplex Timing Gear and chain set up this evening but have run in to a few problems.... The gear on the crank was sitting to proud compared to the one on the cam, so i removed some of the shims. I got the gears pretty close to lining up but now with the chain on its getting caught on the 2 bolt heads below the crank. so not to sure if i need to shim out the cam gear then the crank?

[amgrave]

Those two bolt heads catching on the chain might be the one's you have to counter sink so they are flush with the plate, did you get two counter sink bolts with the chain and sprocket set ?

[julie4morris]

No i was not aware i needed them and it did not come with any. I have ground the heads of the bolts down a bit but it must need a little more off them.

[amgrave]

No you replace them with counter sunk screws that end up flush with the plate they are screwed through. It is best to use Allen headed type screws and set them in with a drop of thread lock.

[julie4morris]

Oooh ok i see what you mean now, i just had a quick look on minispares so i shall get some tomorrow.

Thanks very much

Albert

[julie4morris]

well just pooped up to the shed and remembered that i still have the old drum brakes from when i converted to disks. so i found the drum screws and they worked perfectly after counter sinking.

[amgrave]

Make sure you put a bit of thread lock on them though as you cannot tighten them as much as bolts with heads on.

[philthehill]

These screws are better in that they can be torqued to the required setting if required.

http://www.minispares.com/product/Class ... .aspx|Back to

When countersinking ensure that a 90 degree countersink is used.

As above put a smear of Loctite thread lock on the threads of the screw.
[frame][/frame]

Phil

[julie4morris]

Ok will do

[bmcecosse]

If you have a chain with a 'link' in it (not common - but there are some about) - make sure the link is on the outside - not inside.

[julie4morris]

No link on this one Roy but thanks for the thought, now off to put the head back together

[Martlin]

Looking at the photo’s of the crank showing the big end fixing nuts,what sort of socket do I need to remove these,my torque set do not seem to fit.
Many thanks,
Martin.

[paul 300358]

Big ends are 9/16 AF. You need 12 pointer sockets, not 6.

[philthehill]

Whether you need a 12 point or six point socket depends upon what big end bolts you have fitted.

A photo of the big end bolts would help.

[paul 300358]

Looking at the photo’s of the crank showing the big end fixing nuts,what sort of socket do I need to remove these,my torque set do not seem to fit.

The pictures are on page 2 and they are 12 pointers.