Porsche 928 1982 Instrucciones de funcionamiento e instalación

LIST OF CONTENTS

Engine

Crankshaft Bearings. .

Pulleys .

Alternator .

Check Valve . .

Tensioning Roller Carrier

Oil Pump.

Oil Pressure Valve

Power Transmission - Tranraxla System

Vibration Damper

Differential : : : : : :

Reverse Gear Lock-out ..

Running Gear

Rear Axle Shafts

Brakes .

Electrical System

Start Relay

Fuel Consumption Indicator

Miscellaneous

Equipment

e Air Conditioner

Survey of Number Ranges

Chassis Numbers

Engine Numbers .

Transmission Numbers

Specifications, Adjusting Values, Equipment Survey

Wiring diagrams

Page

.35

Porsche 928 - 1982 Models

For 1982, the 928 will have only minor modifications.

Survey of the most important changes:

Engine

One piece front main bearing

Check valve in cylinder head

0 Modified pressure relief valve

. Modified oil return flow (from shaft seal of oil pump)

. Improved mounting of toothed belt tensioning roller

. Alternator and pulleys

Transmission/Shift/Central Tube

Stronger differential shafts

. Reverse gear deflector

0 Vibration damper in central tube

Running Gear

Friction welded rear axle shafts

. Floating (fist) caliper brakes for US cars

Equipment

Fuel consumption indicator

0 Battery 88 Ah - Standard

EC0 Av switch position for climate control system

Luggage compartment light

Electric seats; automatic forward motion of seat when operating backrest omitted

ENGINE - Crankshaft

Crankshaft Bearings

The former split main bearing no. I (pulley end) is replaced by a one piece bearing. The bearing

has a lubrication groove on the inside as well as 4 slots. A heavy dowel pin, located in the crank-

case upper section, prevents turning.

ENGINE - Crankshaft

Tightening torque for crankcase studs (third step)

New

1 Old

Studs M 10 50+5Nmor 39.3 + 4.9 Nm or

36 4 ft. Ibs.+ 28.4 + 3.5 ft. Ibs.

Studs M 12 75+5Nmor 58.9 + 4.9 Nm or

54 + 4 ft. Ibs. 42.6 + 3.5 ft. Ibs.

All engines, which have been assembled with the higher tightening torque values, are identified

with an “X” near the case number (matching number for upper and lower case sections).

The tightening torque values 50 + 5 Nm (36 + 4 ft. Ibs.) and 75 + 5 Nm (54 + 4 ft. Ibs.) are

applicable to crankcases, which are marked with “X” and/or those with a one piece front main

bearing.

- r

ENGINE - Crankshaft

Pulleys

Beginning with 1982 models the alternator will be driven by a “polyrib” belt. Consequently

changes are made on the crankshaft and alternator pulleys. At the same time the alternator ratio was

changed from 1 : 2.15 to 1 : 2.3.

Note the following combinations.

UP to and

including 1981

Pulley

Crankshaft Alternator Alternator Drive Belt

928.102.116.05 928.603.131 .oo 928.603.113.03 999.192.135.50

92a.io2.i30.02 928.603.131 .oo 928.603.113.03 999.192.135.50

From 1982 92a.io2i39.02 928.603.145.02 928.603.114.00 999.192.214.50

92a.io2.i39.03 928.603.145.02 928.603.114.00 999.192.214.50

ENGINE - Electrical

Alternator

The 928 has a new alternator, rated at - 14 V - 90 A.

The cover and wire harness have also been changed.

ENGINE - Oil Supply, Tappets

Check Valve

A spring-loaded ball check valve (arrow) is installed in the oil supply bore to the cylinder heads.

The valve prevents return flow of the oil

(on a stopped engine) from the supply bore

for the hydraulic tappets.

This feature prevents the development of

tappet noise when engine is stopped for a

long time.

The valve cannot be installed in older cylinder

heads.

ENGINE - Timina

Tensioning Roller Carrier

The mounting of the tensioning roller carrier on the water pump housing is stronger.

The diameter of the bearing pin and bushing have been increased from 10 to 12 mm (0.394 to

0.472”); at the same time the width of the bearing eye was increased from 23 to 25 mm

(0.905 to 0.984”).

It is possible to retrofit older engines with the modified tensioning roller carrier.

Old

New

ENGINE - Lubrication

Oil Pump

Up to now the oil return bore from the shaft

seal led into the intake end of the pump.

Because of this led, it had been possible for

the pump to take in air through the shaft

seal.

-. -

TO prevent this, the return flow bore in the pump body has been modified in such a manner

that oil can flow directly

into the oil sump.

The crankcase lower section

has a return bore in the

area of the suction bore for

the oil oumo.

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