Player0

I installed a spec lightweight flywheel a year or two ago on a car I'm still building.

I noticed tonight that the timing mark I put on the flywheel is 180 degrees off from where the cam mark is (90 degrees off on the cam itself since 2x rotation).

Is it possible that I put the new flywheel on 180 degrees out of phase? Can the flywheel be installed in more than one orientation? I just don't remember.

Dave951

The flywheel only has one additional small hole drilled in it for the locating pin so there really isn't any way for it to fit except in the proper location unless the pin was somehow not in place.

Now weather or not the engine was at TDC when you installed the other belts; well thats a different story.

Player0

Honestly, I don't remember if there was a pin or not when doing the flywheel. From pictures it looks like two of the flywheel bolts might be closer together than the others, which would make it impossible to put in any other way regardless of the pin. Can anyone confirm?

I do have pictures from assembly showing the belts in the right position with the engine at TDC, but I need to check the alignment again manually.

I did have a bit of a clicking noise when a test start backfired last weekend. I thought it was the starter being unhappy but I wanted to make sure I didn't jump teeth. I don't think it would have jumped a dozen teeth though. I didn't see any belt damage.

Player0

I get to answer my own question. Thought I had sold the old flywheel but still have it here so got to measure. Yeah one bolt hole is offset slightly, meaning that pin or not, the flywheel will only bolt on one way.

Chris White

How did you put the timing mark on the new flywheel? Keep in mind that the stock flywheel has two different marks - the one that shows up at the 'timing pointer' and another one that is at the bottom when the engine is at TDC - view able though an opening in the bell housing. Perhaps you transferred the wrong mark?