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-   -   More TDC Questions (http://forums.pelicanparts.com/porsche-924-944-968-technical-forum/401121-more-tdc-questions.html)

CJFusco 03-30-2008 09:05 AM

More TDC Questions
 
Well, Sundays are my day to work on the Porsche... I was planning on AT LEAST getting the belts off, the cam tower off, and MAYBE even the exhast manifolds...

Well, I wanted to MAKE SURE that my engine was at TDC. The camshaft gear notch lined up, and I looked into the flywheel inspection hole and saw what appeared to be the TDC marker (a black line running across). Just to make sure, I cranked the engine another 180 degrees... and saw, in the flywheel inspection port, what looked like a TDC marker on the flywheel.

Now, doesn't the camshaft turn twice for every rotation of the flywheel? Shouldn't I be seeing a TDC mark on the flywheel every OTHER time that the camshaft gear notch matches up with the mark?

MORE CONFUSED THAN EVER!

JamesO 03-30-2008 10:40 AM

The Crank turns twice as fast as the cam, have a look at the pully sizes.

CJFusco 03-30-2008 11:04 AM

So as long as I can see a mark on the flywheel, and the cam gear is lined up, i'm ok?

JamesO 03-30-2008 11:19 AM

Yep, I wouldnt get too hung up about it if your pulling the top end anyway things will be much clearer.
As long as you turn it over by hand with a wrench on the crank nut before trying to start it when its back together you cant do too much harm

CJFusco 03-30-2008 01:13 PM

Thanks for the info. Something tells me I'll be obsessively checking the flywheel throughout this entire process...


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