Checking And Adjusting Drive Belt - Porsche 928 Workshop Manual

928
Engine/Cylinder Head, Valves
15
6. Prepare Special Tool 9201 for checking. Pull out
lockpin on special tool and slide out gauge pin
opposite the lockpin fully. Line up maximum
indicator with gauge indicator.
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7. Slide special tool on to relaxed section of drive
belt (sliding shoes on smooth surface, rollers in
tooth gap).
8. Press down tester on case larrow 1) slowly until
gauge button (arrow 21 resting on the air pump
bracket engages.
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Note:
Sliding shoes must rest on belt with their complete
surface. The special tool must not be turned or
moved on the belt while checking.
9. Pull out lockpin to have the gauge button
disengage again.
Important:
This test requires the engine in the position described
in point 4.
Repeat test one or two times!
Adjusting value: 4.5 scale units.
Correct belt tightness if necessary.
Adjusting
The drive belt adjusting screw is located on bottom
of engine at front right.
Line up maximum indicator with gauge indicator
(in anticlockwise direction).
Read value while keeping the tester free of tension,
i. e. horizontal to the drive belt.
Tester must not contact plastic cover.
Printed in Germany - VI. 1982 Checking and Adjusting Drive Belt 15.18~