Checking, replacing and tightening conrod bolts - RA03001043100X(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, 4351

STRETCH SHANK BOLT (1ST VERSION) ⁽¹⁾

Conrod bolt part no.

102 038 00 71

Thread dia.

M 9X1

Stretch shaft dia. (c) when new

7,4-0.1

Minimum stretch shaft dia. (c)

7,1

Length (L) when new

52-0,3

⁽¹⁾	Engine 104.98 up to 11/90

Fig 1: Identifying Stretch Shank Bolt Dimension (1St Version)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

TIGHTENING TORQUE IN NM OR TIGHTENING ANGLE

Stretch shank bolt

Initial torque ⁽¹⁾

Tightening angle

90-100°

⁽¹⁾	Thread and contact surface of bolt moistened with engine oil when installing.

STRAIGHT STRETCH SHANK BOLT (2ND VERSION) ⁽¹⁾

Conrod bolt part no.

102 038 02 71

Thread dia. (d)

M 9X1

Length (L) when new

52-0,3 ⁽²⁾

⁽¹⁾	Engine 104.98/104.99 as of 11/90

⁽²⁾	Re-use conrod bolt up to max. 52.9 mm.

Fig 2: Identifying Straight Stretch Shank Bolt Dimension (2nd Version)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

TIGHTENING TORQUE IN NM OR TIGHTENING ANGLE

Straight stretch shank bolt

30 (40) ⁽²⁾

Initial torque ⁽¹⁾

Tightening angle

90-100°

⁽¹⁾	Thread and contact surface of bolt moistened with engine oil when installing.

⁽²⁾	For first tightening

STRAIGHT STRETCH SHANK BOLT

(3rd version)

Conrod bolt part no.

111 038 00 71

Thread dia. (d)

M 9 X 1

Length (L1) when new

52-0.3 ⁽¹⁾

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

Fig 3: Identifying Straight Stretch Shank Bolt Dimension (3rd Version)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

TIGHTENING TORQUE IN NM OR TIGHTENING ANGLE

Straight stretch shank bolt ⁽¹⁾

First tightening

Initial torque

Re-tightening

Tightening angle

90-100°

⁽¹⁾	Thread and contact surface of bolt moistened with engine oil when installing.

Conrod bolts	re-use up to minimum stretch shaft dia. or up to max. stretch shaft length.
Weight	pay attention to differences.
Thread and bolt head contact surface	oil before installing.
Conrod bolts	tighten initially with torque wrench 001 589 66 21 00.
Conrod bolts	tighten with tightening angle wrench. Pay attention to tightening torques. The conrod bolts differ in weight. Only identical conrod bolts may be installed in an engine. NOTE: If no tightening angle wrench is available, the conrod bolt can be tightened further with a socket wrench and tommy bar by the specified angle in a single tightening operation. A flexi-rod torque wrench must not be used for tightening to degrees of angle in order to avoid angle errors.

Special tool

Fig 4: Identifying Special Tool (001 589 72 21 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.