Technical modifications: Diesel Injection system Engines 602.96, 603.96/97 TURBO

Op. No.

Designation

Nature and reason for modification

Production breakpoint

as of

-

Injection pump

Engine 603.96: Injection pump with modified cam shape, prechamber with enlarged volume.

06/91 or model year 1992

-

Pressure transducer

Elimination of pressure transducer with automatic transmission, national versions   .

01/91

07.1-0010

Injection nozzles

Precision ground injection nozzles.

08/89-02/90

07.1-0010 section P

Injection nozzles

Facet depth on spray pintle reduced.

04/92

07.1-0010

Key-operated engine stop

Engine 603.971, model 140: Key-operated engine stop operates via a relay and an electric switchover valve.

Model year 1992

07.1-0010

Exhaust gas recirculation ARF

ARF shutoff at 10° before full load by means of microswitch and switchover valve in order to reduce smoke emission during load change in direction of full load.

06/91 or model year 1992

07.1-0010

Charge pressure control

(P2 control)

Elimination of dependence of charge pressure control on coolant temperature and intake air temperature.

On engine 602.96 the charge pressure is controlled by a common pressure converter and an electrical switchover valve each for vacuum unit, charge pressure control valve or control pressure flap, on engine 603.971 by means of a pressure converter and a switchover valve.

06/91 or model year 1992

07.1-0010

Base module and test coupling

Engine 603.971: Basic module performs the function of the overvoltage protection relay and the 38-pin test coupling is integrated in the module box.

Model year 1992

07.1-0010

Pressure sensor

The Bosch pressure sensor is replaced by a Nippon Denso pressure sensor.

06/91 or model year 1992

07.1-0010

ARF valve

For noise reasons the ARF valve has a smaller air shaft and a shaped valve seat. Connection fitting for vacuum connection is tulip-shaped.

07/91

Op. No.

Designation

Nature and reason for modification

Production breakpoint as of

07.1-0010

Electronic diesel system (EDS)

Electronic diesel system control unit (EDS 6) engine 603.970  software modified (exhaust recirculation rate increased).

11/90

07.1-0010

Engine overload protection

Engine overload protection no longer fitted to all engines equipped with charge pressure control.

06/91 or model year 1992

07.1-0010

Exhaust gas recirculation valve

Cast EGR valve (was steel)

Reason: cost and weight reduction.

Engine 602.961/962, 603.960/963/971

12/92 or 01/93

07.1-0010

Exhaust gas recirculation valve

EGR valve vent restrictor modified.

Engine 603.960/963/971

06/93

07.1-0010

Engine overload protection

Elimination of engine overload protection

Engine 602.962, 603.960/963

01/93 or 02/93

07.1-1100

Start of delivery, idle speed control

Start of delivery shifted from 151 ° after TDC to 140.5 ° after TDC.

On engine 603.971 idle speed reduced from 63020/min to 61020/min.

06/91 or model year 1992

model year 1992

07.1-1826

Vacuum control valve

Vacuum control valve modified, seal integrated.

Engine 602.962, 603.960/963/971

11/93

07.1-1826

Vacuum control valve

Restrictor integrated in vacuum control valve.

Engine 602.962, 603.960/963/971

06/94

07.1-1843

Vacuum pump

Vacuum pump modified for cost reasons.

Engine 602.962

12/94

Op. No.

Designation

Nature and reason for modification

Production breakpoint

07.1-1121

Testing electronic diesel system (EDS)

Engine 603.971, electric and pneumatic function test of key-operated engine stop because of modified version.

Model year 1992

Op. No.

Designation

Nature and reason for modification

Production breakpoint

07.1-0500

Vacuum diagrams

Separate vacuum supply for key-operated engine stop. The vacuum supply is taken from the check valve of the main vacuum line.

07/87

07.1-0500

Vacuum diagrams

Elimination of vacuum amplifier of automatic transmission.

06/91 or model year 1992

07.1-0500

Vacuum diagrams

ARF shutoff by means of microswitch and switchover valve to achieve rapid exhaust gas recirculation shutoff at full load.

06/91 or model year 1992

07.1-0500

Vacuum diagrams

P2 control and vacuum control flap are each actuated by their own switchover valve and the same vacuum transducer.

06/91 or model year 1992

07.1-2053

Idle speed

Injection pump engine 603.971, idle speed reduced from 630 rpm to 610 rpm.

09/91

07.1-5563

Fuel filter

Standard filter box for end line pump and distributor pump

Engine 602.962, 603.960/963/971

03/94

07.1-6750

Injection nozzle

Ejection pressure of used nozzle at least 130 bar (previously 120 bar).

06/91 or

model year 1992

07.1-6810

Bracket of injection pipes

Standardization of brackets for injection pipes (reduction of versions)

Engines 602.961/962, 603.960/963/971

04/93

07.1-6810

Bracket of injection pipes

Brackets for injection pipes cylinders 1-3 made of modified material (PA46, was POM 906)

Engines 602.961/962, 603.960/963/971

06/93

Op. No.

Designation

Nature and reason for modification

Production breakpoint

07.1-6810

Leak oil hose

Leak oil hose between nozzle holders modified. Improved fitting security of hoses to connection of bracket.

Engines 602.962, 603.960/963/971

02/94

07.1-8014

Injection timing device

Segment flange of injection timing device modified from forging to sintered part.

Engines 602.962, 603.960/963/971

04/94

07.1-8240

Start of delivery

Start of delivery altered from 151 ° after TDC to 140.5 ° after TDC.

06/91 or model year 1992

07.1-8823

Immobilizer

Engine parts for immobilizer. New parts: shutoff valve, overflow valve.

Engine 603.971

10/94