Porsche 928 Workshop Manual page 26

General
928
Camshaft
Camshaft drive
Cast steel, runs in camshaft
housing without bearing shells
Toothed belt and tensioning
roller
Cylinder head
Valve arrangement
Light alloy
1 intake, 1 exhaust. "vet-
head, in-line
Valve timing
By overhead camshaft and hy-
draulic cam followers
Timing (1 mm lift,
zero valve clearance)
Intake opens 12" after TDC
Intake closes 48' after BDC
Exhaust opens 32' before BDC
Exhaust closes V' before TDC
Valve clearance
Automatic hydraulic adjustment
Engine Cooling
Engine Lubrication
Oil filter
Oil pressure at 5000 rpm
Oil pressure indication
Oil consumption
Exhaust System
Emission control
Heating
l/1000 km
qtj600 mi.
Closed cooling system. Imechan-
ical fan with viscous coupling
(electric fan and rhermo witch
for cars with air conditioner)
Pressure lubricating system
with sickle type pump
Full flow
Approx. 5 bar at 80 to 100' C/176 to 2i2" F
oil temperature
indicator lamp and pressure
@"F
Approx. 1.5
Twin pipes up 1" cataly-
tic converter. then single pipe
to center and final mufflers
Oxygen sensor with 3-way
catalytic conve*tet i from 1981 additional secondary
air injection
Warm water heater with heat
exchanger and blower
Fuel System
AFC (Air Flow Controlled)
fuel injection
Fuel supply
Electric delivery pump
a
0; 10 Technical Data
Printed in Germany