Porsche 912 E - Cylinder to Piston Clearance

Checking piston ring side clearance.
Side Clearance Wear Limit
mm
mm
Upper compression
ring
0.04-0.07
0.12
Lower compression
ring
0.04-0.07 0.10
Oil scraper ring
0.02-0.05 0.10
Inspect and fit pistons. Depending on given
.. tolerances,. some piston pins can be pushed into
the cold piston by hand. This is normal, even if
the pin should slide out of the piston under its own
weight. It is not appropriate in such cases to
replace either the piston pin or piston, or both.
CHECKING CYLINDER TO PISTON
CLEARANCE
The cylinder bore is measured with an inside
micrometer. First adjust the inside micrometer
with a master
gauge.
Engine, Crankshaft, Pistons
13
Checking cylinder bore.
Measure the cylinder bore approximately 10 to
15 mm below the top edge
of the cylinder.
Installed Clearance Wear Limit
0.02- 0.05 mm
0.2 mm
Checking piston
diameter.
The nominal piston diameter is embossed on
the piston crown. Measurements are made at the
lower end
of skirt, perpendicular to the piston
pin
axis~
Printed in Germany
Checkin~ Pistons Checkin~ Piston to Cylinder Clearance 13- 5