Ford Aerostar 1997 Workshop Manual page 86

1997 Aerostar/Ranger
10. NOTE: Each piston to be positioned at TDC. Dimension "Z" is the average of two readings
measured from top of cylinder block to piston dome face.
NOTE: Both measurements must be taken parallel to crankshaft and a straight line through the
measuring points must pass through the true center of the cylinder.
Check the piston installed height as follows:
a. Install Dial Indicator with Base D78P-4201-B or equivalent on the cylinder deck, next to the
piston to be checked.
b. Zero the indicator with the tip on the engine block deck.
c. Carefully move the indicator over to the piston and take a reading on the piston's machined
crown.
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2011-04-27