Central Locking System Modification (80/14)

Publication date: 1984-03-01
Reference number: 80/14

CENTRAL LOCKING SYSTEM MODIFICATION

TECHNICAL SERVICE BULLETIN

Reference Number(s): 80/14, Date of Issue: March 1984

MODIFICATIONS TO CENTRAL LOCKING SYSTEM - MODELS: 240D; 300CD/D/TD; 380SEC/SEL)

A: CONTROL VALVE - MODELS: 240D; 300D/TD

B: DOOR ACTUATOR - MODELS: 240D; 300CD/D/TD

C: RELOCATING OF CHECK VALVE - MODELS: 240D; 300CD/D/TD

D: SUPPLY PUMP AND LOCK ACTUATORS - MODELS: 380SEC/SEL 500SEC/SEL

Model(s): Mercedes 240D, 300CD/D/TD, 380SEC/SEL

Group: Accessories & Electrical

Bulletin No.: 80/14

Date: March 1984

SERVICE INFORMATION

A. CONTROL VALVE - MODEL 240D, 300D/TD

Since July 1983, a modified control valve with an improved seal for cold weather operation was phased into production. Unlike the previous version, the new valve does not require adjustment during installation. The modified control valve can only be installed in previous vehicles in conjunction with the following parts:

Link pull rod
Screws B 4.2 x 25mm with washers

CONTROL VALVE PARTS INFORMATION

QTY.	PART NAME	PART NUMBER
1	Control Valve (modified)	000 800 10 73
1	Pull Rod	123 723 07 69
1	Link	123 805 01 32
2	Screw	007981 004250
2	Washer	000125 004313

B. DOOR ACTUATORS - MODELS 240D, 300CD/D/TD

Since March 1983, vacuum actuators (Fig 1 ), manufactured by Alfmeier, were installed in doors with a modified actuating rod connector. The vacuum actuator made by VDO (Fig 1 ) remains unchanged. Actuators from both manufacturers are interchangeable.

Fig 1: Vacuum Actuator (VDO)

Fig 2: Vacuum Actuator (Alfmeier)

REPLACEMENT PROCEDURE

Install the modified actuator with the previously removed screws.
Push down door lock button.
Completely pull out slotted actuating rod connector while pushing locking sleeve down at the same time.
Insert grooved portion of actuating rod into rod connector and push locking sleeve up against stop, while holding the actuating rod in place.

C. RELOCATION OF CHECK VALVE - MODEL 240D, 300CD/D/TD

As of June 1983, the central locking system check valve has been relocated from behind the instrument cluster into the driver's door.

CENTRAL LOCKING VALVE - PRODUCTION PHASE-IN

MODEL	AS OF CHASSIS END NUMBER
240D	409814
300D	033624
300CD	003790
300TD	017218

D. SUPPLY PUMP AND LOCK ACTUATORS - MODEL 300SEC, 380SE/SEC/SEL, 500SEL/SEC

Since July 1983, the model 201 supply pump (rotation changes for vacuum/pressure) was installed in Model 380SEC/SEL.

New actuators (20 mm shorter than in model 201) for the fuel filler door and trunk lid were also phased into production.

A locking sleeve is now used to connect the actuator rod, instead of a clip.

SUPPLY PUMP & LOCK ACTUATOR - PRODUCTION PHASE-IN

MODEL	AS OF CHASSIS END NUMBER
380SE/SEL	049170
500SEL	037297
300SD	051493
380SEC	008087
500SEC	007459

NOTE: The new supply pump and new foam housing, as well as the control actuator (driver's door) and door actuators can also be installed in earlier production vehicles. The previous version actuators in stock can be used up.

INSTALLATION OF MODIFIED ACTUATORS

Remove actuator.
Prior to installing the new control actuator, slide the locking sleeve down while applying a counterhold from the bottom with a 4 mm pin.
Prior to installing a door fuel filler flap, or trunk lid actuator, thumb-seal the vacuum connection and slice the locking sleeve down to the stop.
Fasten actuator with previously removed screws.
Insert actuator rod without preload into rod connection, while pushing slip joint up to its stop.

MODIFIED ACTUATORS PARTS INFORMATION

PART NUMBER	PART NUMBER
Supply Pump	000 800 03 48
Foam Housing	126 805 03 90
Control Actuator	002 820 55 10
Door Actuator	000 800 71 75
Fuel Filler Flap and Trunk Lid Actuator	000 800 72 75