Porsche 928 Workshop Manual page 191

928
Engine, Cylinder Head, Valves
15
CHECKING AND ADJUSTING DRIVE BELT
Checking
1. Loosen and remove drive belt cover upper
sections on both sides.
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2. Turn engine in direction of rotation to TDC
(cylinder 1). In this position marks on camshaft
sprockets must be aligned with marks on flange
bearings.
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Printed in Germany - VI, 1982
Checking and Adjusting Drive Belt 15.17
3. Turn engine two more turns until TDC mark is
reached again and check drive belt for damage
and wear at the same time.
4. Check drive belt tightness between tension roller
and camshaft sprocket on relaxed section of
belt with Special Tool 9131.
Drive belt tightness is correct when right mark is
between both left marks and special tool rests
on rear drive belt cover. (Engine must be
positioned for this test as described in point 2.)