Porsche 928 Workshop Manual page 565

928 Ignition System
28
REPLACING SPARK PLUGS (32 VALVE ENGINE)
1. Unscrew suction pump on left side of
intake air distributor and clamp on vacuum
hose.
2. Unscrew spark plug with a standard
wrench (car tool set has a special spark
plug wrench).
3. Lubricate spark plug threads with a
light coat of grease, e.g. white Molykote
HTP Paste.
Tightening torque: 30 Nm.
Printed in Germany- X, 1984
Replacing Spark Plugs
28 - 67