Porsche 928 Workshop Manual page 190

15
Engine/Cylinder Head, Valves
928
TOOTHED DRIVE BELTS WITH HTD TEETH
Beginning with 1983 Models
Note:
The shape of teeth on drive belts for camshaft sprockets, oil pump sprocket and crankshaft sprocket
has been changed to High Torque Drive (HTDI.
Old Tooth Shape
HTD Tooth Shape
Old Camshaft Sprocket
HTD Camshaft Sprocket
I 1'
i--l,-A.~.</,i ,
3\,
'L'
.!,
'!,
(1 1.
'...
.)
1
';,I ;
I 1 '.
It1 )
1
a
N o t e : New HTD drive belts can also be used on older engines, if above mentioned sprockets with new
tooth shape are used at wne time.
Sprockets with different teeth shape should never be mixed.
a
15.16
Drive Belts with HTD Teeth VII, 1983 Printed in Germany
(Beginning with 1983 Models)