Handy930

Trying to set the valve timing. I follow the procedure in the manual and Demsey's book. No problem setting the left side. When I follow the procedure for the right side I run into trouble. I have cams with a bolt not the big hex nut so no way to hold the cam inposition. When I set the correct timing on the right side and then pull the pin from the chain cog the cam slips back with the valve spring tension. I don't know how to hold the cam in position while I rotate the crank back to TDC. I have done this without problems in the past(16 years ago). What am I missing here?

Vincent C.

mark the cam, pull the pin, let it slip back, then rotate the crank back to where it would of been, then add another hole back, then install the pin and rotate it up to tdc.....then do the cam timing....the cam is to retarded for the crank position.....hope this make sense.....vinnie

Toby Pennycuff

You really should buy the cam holding tool, P9191, from the factory. You can buy it from your local Porsche dealer. Part number is 000-721-919-00 I think. You can also buy it from Samstag Tools for $93. Oh, and yes, Stephen Stomski makes an add-on for the factory tool as well!

Handy930

Vinnie, not sure I follow this. After the cam slips back I assume I would turn the crank just short of 720 to get close to overlap on #4 and reinstall the pin and then rotate to TDC/overlap.

Toby, I have the cam holder tool on order(back order) but don't see how I can rotate the cam with it. The part number you show took me to something for the fuel system.
I'll try Vinnie's suggestion today and see what happens. I don't understand why the right cam slips back and the left does not.

JFairman

If the rest of the elephant foot adjusters are loosened all the way would that help? Or remove the other rockers.

Handy930

Right, that is what I did. Surprised that with only one rocker installed that it would rotate the cam backwards. Thanks for the reply.

Toby Pennycuff

Your cam is "on the cam" when you are trying to adjust. The cam holder tool will insure that you have a good hold on the cam and can move it while the crankshaft stays at TDC on #1 to time #4. The Stomski tool will help you hold the cam and tighten the cam bolt at the same time.