Haynes manual says flywheel can be installed only in one position, since bolt holes are not equally spaced.

 

Seems like bolt holes are equally spaced and I CAN install it any which way I want...am I missing something?

You can put it on anywhere you want , it is not "keyed" to one spot

If it's a standard (which I presume ) when you attach the pressure plate the white marks are align so that they are as far apart as possible (being a OEM pressure plate)

 

SEA#3

Your Haynes manual is refering to the older EA engines about the flywheel.

If flywheel is not keyed, what does a "zero mark" on flywheel mean? Is it inherent in the flywheel machine casting? Would resurfacing damage it? BTW, I could not find the flywheel "zero mark".

 

The subaru service manual suggests that flywheel zero mark must be atleast 120 degrees away from pressure plate zero mark. These zero marks define the direction of "Residual imbalance" I found the pressure plate zero mark, but not the flywheel zero mark. I marked the old pressure plate/flywheel alignment and am going to position the new pressure plate zero mark at same position.

 

BTW, the new pressure plate seems to have a zero mark at different location. If you look at the pressure plate closely, there are three almost symmetrical things along the edge. One of them has a pin missing. The plate I want to replace has the pin missing almost 180 alway from zero mark (reddish/orange on old plate). However the new oem pressure plate I got from 1stsubaruparts had a pin missing from a location approx 90 clockwise from the zero mark (yellow in color). Does anyone know why this difference exists? Is zero mark different for each pressure plate manufactured?

 

What happens if these marks don't line up...

The "Zero mark" is just some white paint that is usually on the edge of the flywheel by the ring gear

 

SEA#3

There was no "White paint" on my flyweel...

No paint marks at all ? It may be covered by rust or clutch dust

SEA#3

None that I could see after trying hard. However I had noted the alignment of older pressure plate in relation to flywheel before I took off the old pressure plate.

 

I still don't understand what a flywheel zero mark is if the flywheel is not keyed!

Is there inherent "residual unbalance" built into machine casting? Seemed pretty symmetrical to me...

and you can get quite a bit of balance change brtween the clutch cover and fly wheel. Usually you are not going to be that far off on a car, but it can give a bit of vibration if everything comes up wrong.

If you are really doing an engine right all moving components are balanced to work together. Used to cost me about $300 to have a hot rod engine balanced, probably more than that now.