Checking, replacing, and tightening conrod bolts - RA03001203100X(03-3100)

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 03-4341, 03-4351

Fig 1: Identifying Conrod Bolts Length

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Conrod bolts	re-use up to max. 52.9 mm.
Thread and bolt head contact surface	oil before installing.
Conrod bolts	pre-tighten with torque wrench 001 589 66 21 00.
Conrod bolts	tighten with angle tightener. Pay attention to note.

NOTE: From 05.93 modified conrod bolts are installed. The tightening torque remains unchanged. Stretch shank bolt with rolled head.

DIMENSIONS OF CONROD BOLTS IN MM

Part no.

111 038 00 71

Thread dia. d

M9 X 1

Stretch shaft dia. c when new

8.7 - 0.2

Minimum stretch shaft dia. c

8.2

Length L

52.0 - 52.9 ⁽¹⁾

⁽¹⁾	Re-use conrod bolts up to max. 52.9 mm.

TIGHTENING TORQUES IN NM

Conrod bolt

Initial tightening torque ⁽¹⁾

30 (40) ⁽²⁾

Tightening angle

90-100°

⁽¹⁾	Thread and contact surface of nut and bolt moistened with engine oil before fitting.

⁽²⁾	For initial tightening.

Special tool

Fig 2: Identifying Special Tool (001 589 66 21 00 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

NOTE: If no angle tightener is available, the conrod bolt can be further tightened by the specified angle in a single operation with a socket wrench and lever. Do not use bending-rod torque wrenches to avoid any angle errors when tightening according to angle of rotation.

Fig 3: Identifying Conrod Bolt Tightening Angle

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.