Porsche 928 Workshop Manual page 160

13
Engine, Crankshaft Drive, Pistons 928
Machine the cylinders as follows:
Move the grinding head into the bore.
Turn the adjusting wheel anti-
clockwise until the felt strips touch the bore.
Start the machine and
continue turning the handwheel anti-clockwise until the load gauge shows
approx. 20 - 30 %.
Set the advance wheel scale to 20.
The machine will switch off automatically after approx. 80 seconds. The
cylinder surface is now matt and dull.
Before starting on the next cylinder apply another coating of silicone
compound to the felt.
Note:
If the holders with the felt inlays are not in use, they must be kept
in the storage box so as to remain absolutely clean.
Never re-use the silicone compound.
13 - 28 Remachining Cylinder Bores
a
Printed in Germany