TR6 TR6 Timing- Need help please

[houleyh]

Trying to fit a timing chain and time the two shafts. When crankshaft is true north (TDC) does the camshaft line needs to point the crankshaft?

How do I make sure I did right not aving any mark on the crankshaft's sprocket?

Thanks

 

[Got_All_4]

THIS IS CRITICAL SO IT MUST BE CORRECT. IF THERE ARE NO MARKS ON THE NEW TIMING SPROCKETS YOU CAN MATCH THEM UP TO YOUR OLD ONES. LINE UP THE KEY WAY ON THE SMALL ONE AND MATCH UP THE HOLES ON THE CAM SPROCKET. USE A SHARPIE TO TRANSFER MARKS SO CAN BE WIPED OFF LATER IF NEEDED. MINE WERE STILL OFF ABOUT 1/2 TOOTH SO THE BEST THING TO DO IS FIND AN ENGINE BUILDER AND HAVE THEM DEGREE THE CAM. THAT'S WHAT I DID. HE CAME OVER TO THE HOUSE AND DID IT. I KNOW NOW MY TIMING IS ALMOST PERFECT. 1 DEGREE OFF.

 

[piman]

Hello Yvan,
as a general rule for most single camshaft engines, with number 1 cylinder on TDC, number 6 (or 4 on a 4 cylinder) cam lobes should be on equal lift. It is easier to check this with a dial indicator (Clock gauge) but it can be done with the head and rockers in place by adjusting the valve clearance very wide so that there is a gap that you can check with a feeler gauge.
The Triumph camshaft wheel can be fitted four ways to fine tune the timing, so get the crank and cam in the correct relationship then try the cam wheel so that the holes line up. You may need to turn it back to front, this is OK and part of the design.
For absolute precision in setting you need the cam timing figures and a clock gauge, the method I outlined above is fine for most applications but may not be good enough for a high performance cam.

Alec