cam timing data

[Gadgetman]

does anyone have the cam card timing  data for a 308778 camshaft ??

Thanks

[JohnD]

This can, like all OE Triumph cams, is "symmetrical" and may be timed by the "Equal Lift on Overlap" method, that requires no magic degree numbers.  Do a search for the technique details.

 

[Mjit]

The equal lift on overlap method's much easier than the stick-a-paper-disk-on-the-crank-pulley method.

You need at least 1 dial gauge for the lift on overlap method and if the head's off it's worth using it to get an accurate TDC measure.  The timing mark May be correct.  May be...

[dave.vitesse]

Have a look in the Standard Triumph Workshop manual to set the cam timing up. Yes get the TDC right and then the timing chain to cam by using the valves (11 and 12) on number six cylinder. It's known as rocking the valves. It's in the manual.

You could make a simple disc using a pair of dividers to check the valve rock is equal around the TDC. Though the feeler gauge method given in the manual is probably more accurate. As John said the cam has equal lift so you are only ensuring the centre point of the cam is set to the TDC point. The valves, rockers and a feeler gauge act as a dial gauge.

Once you have the TDC right you should be able to check and if required correct the TDC mark on the pulley.

If the head is on you can check the TDC, carefully, through the spark plug hole.

Both rocking the valves and checking the TDC through the spark plug hole can take time to get it right.

Dave