"ccjersey" wrote:

Only two timing marks on a CAT flywheel would fit 2 or 4 cylinders if they are 180 degrees apart.........even if the marks are 120 degrees apart, no way those old engines would have just 1-6 and 3-4 because the marks are used to set the fuel pump lifters so obviously something's missing.

You can accurately create marks with a dial indicator set up on a rod like you were using to eyeball the piston positions. You turn the crank to max piston height and scribe a temporary mark on flywheel. Then you go past TDC and turn crank back to max piston height and scribe another temporary mark. Then you scribe a permanent mark half way between the two temporary marks.

I hope if you clean the flywheel really well you will find the missing mark.

"tctractors" wrote:

The important thing here is to make sure you are turning the engine over Clockwise from looking directly at the fan, I always use the engine turning tool that fits in the starter hole, the Flywheel being out is a pain but you have been instructed on how to set your own marks, this involved making 2 marks and bisecting these marks to find TDC, with TDC located you can then check the valve timing also the pump timing, I best wish you lots of luck and stick at it. tctractors