Cam Timing and Marks

dcriss · 09-28-2007, 09:51 AM

According to the Porsche 911 Workshop Manual (under cam timing basic settings), you should set both cam punch marks facing up and cylinder 1 to TDC at Z1 on pulley. However, on my 1980 3.0L, only one of my cams has a punch mark. what do I do????

and
no punch mark

AngM018 · 09-28-2007, 10:05 AM

can you still see the "930" punched into that cam or is it too scratched up? the 930 needs to be facing upwards just like the punch mark

dcriss · 09-28-2007, 10:55 AM

Not sure if I cam still see the 930 mark. What about the cam lobes? Do they align somehow with the 930 and punch marks?

MBruns · 09-28-2007, 12:30 PM

Just use the key way groove as the indication for the punch mark location

Mike Bruns JBRacing.com

MobileWrks · 09-28-2007, 12:57 PM

As long as you can read it right side up your good.. There really is no exact posistion to install besides right side up.. I always install left cam first. Do intake rocker only on #1, set your cam timing, rotate 360 and double check then do #4 rocker intake only.. Limits your risk of bending something if it is new knowledge to you..

cstreit · cstreit's Garage

As Mike said, the woodruff key position should be UP on both...

dcriss · 09-29-2007, 05:07 AM

Thanks Guys,

I will set the "woodruff keys" up and set timing on cylinder #1 first then #4.

Thanks again for your help.

viejopatron · viejopatron's Garage

If you really want to sleep well, Dan, have a pro wrench check your timing. I did and slept great.

Seriously, I felt I had too much time and money invested to not insure this part of the assembly was correct.