Replacing Spark Plugs - RA15001191031X(15-1031)

WARNING: This page does not describe the selected car, but rather 42 other vehicles, including the 1999 Mercedes-Benz S600, 1999 Mercedes-Benz S500, 1999 Mercedes-Benz S420, 1999 Mercedes-Benz S320, and 1999 Mercedes-Benz CL600. However, it is still accessible from the selected car via links, so may be relevant.

Operation no. of operation texts and work units or standard texts and flat rates:

15-1031

Replacing

Fig 1: Replacing Spark Plugs

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Covers (21)	remove, fit on.
Spark plug connector (arrow)	slacken by turning to right and left, pull off, fit on. Blow out recesses with compressed air. When fitting on, ensure the ignition cables are correctly routed. Clean ignition cables.
Spark plugs	unscrew, screw in; replace if necessary. Tightening torque 20-30 Nm. Use approved spark plug wrench 119 589 02 09 00 for installing. Use only approved spark plugs with flat seat and seal. Check electrode gap. Specification = 0.8 mm.

Special tool

Fig 2: Identifying Special Tool (119 589 02 09 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Spark Plug Table

Since April 1988 Bosch spark plugs, and since September 1988 spark plugs with a larger diameter of the central electrode have been installed.

These spark plugs are identified with an "O" e.g.

BERU 14K-7DUO

BOSCH H7DCO

Since September 1989 Champion spark plugs have been installed with a central electrode provided with a copper core.

These spark plugs are identified with a "C" e.g.

CHAMPION S10YCC

Basic and national versions except

, KOREA, TAIWAN

Manufacturer

BERU

BOSCH

CHAMPION

Spark plugs for normal compression

14F-8DUO

F8DCO

C10YCC

14F-7DUO ⁽¹⁾

F7DCO ⁽¹⁾

C9YCC ⁽¹⁾

Spark plugs for low compression

14F-7DUO

F7DCO

C9YCC

⁽¹⁾	Up to 06/91

National version ²⁾

, KOREA, TAIWAN

Manufacturer	BERU	BOSCH	CHAMPION
Spark plugs	14F-9DUO	F9DCO	C12YCC
²⁾ The spark plugs are approved only for max. speed of 160 km/h. Vehicles of the aforementioned national version should be equipped with spark plugs of the basic version when used outside of their country (tourist vehicles).

Additionally approved spark plugs

The Beru silver spark plugs (Silverstone) are approved for retrofitting (refer to matching of standard spark plugs and silver spark plugs).

The platinum spark plugs are no longer approved.

Standard	Silver
14F-7DUO	S3F