Checking And Adjusting Tension Of Alternator Poly-Rib-Heft - Porsche 928 Workshop Manual

13
Engine/Crankshaft, Pistons 928
l
CHECKING AND ADJUSTING TENSION OF ALTERNATOR POLY-RIB BELT
'82 MODELS ONWARO
Checking
l.Prepare Special Tool 9201 for the
check. Remove locking pin from
. Special Tool and push measuring
pin opposite locking pin out as
far as it will go. Align drag
needle with measuring needle.
2.Push Special Tool on to belt
(sliding shoe on smooth surface).
Slowly press measuring button
(arrowed) in until locking pin is
felt to engage and read value
from dial.
Settings:
New belt:
Used belt:
9.2
8.4 + 0.8
If necessary, adjust belt tension.
l.Contact must be established
between the entire surface of the
sliding shoe and the belt. While
the measurement is being taken,
do not allow the Special Tool to
turn or its position on the
belt to change.
2.The lower tolerance limit of a used
belt should be set with the belt
cold (room temperature approx.
ZO'C) and the upper tolerance
limit with the belt warm.
Remark:
The new Poly-rib belts in used '85
models onward (32-valve engines)
have 6 ribs (previously 5).
a
13 - 18 b Checking and Adjusting Tension of
Printed in Germany
Alternator Poly-Rib Belt