Volvo Engine >> REVISED CONNECTING ROD BOLT FOR 3.0L VOLVO

Volvo Engine >> REVISED CONNECTING ROD BOLT FOR 3.0L VOLVO

Revised Connecting Rod Bolt For
1992-99 Volvo 3.0L Engines

The AERA Technical Committee offers the following information regarding revised connecting rod bolts for 1992-99 Volvo 3.0L engines. During engine manufacturing in 1998, Volvo introduced a revised rod bolt, which incorporated a different thread pitch. Intermixing of the two different design bolts is not desired. Note: Some service information references this engine as a 2.9L displacement.

These bolt designs are very similar and offer little visual identification where installed in production engines. The revised bolt has a closer pitch of thread. During the 1997 production year both bolt designs were used. It is important to note that both designs may be used but one design should be used within one engine.

Identifying bolt types:

1. Older bolts from the factory have M9 x 1.25 mm angle of thread and have no markings on the bolt head. Old bolts as replacement part (Part #1271900-1) have a circular stamp in the bolt head as shown below in Figure 1.
2. Revised screws in production engines from the factory have closer M9 x 1.0 mm angle of thread and have no markings on the screw head. New screws as replacement part (Part #9125471-4) have a triangular stamp in the screw head as shown below in Figure 1.

A thread gauge should be used to check which type of screw is used. This may be required, as no markings were used on production bolts. Volvo offers thread gauge M9 x 1.0 mm with Part #1158902-5 and thread gauge M9 x 1.25 mm with Part #1158901-7.


FIGURE 1.
Older screw to left in illustration REVISED screw to right in illustration

The AERA Technical Committee

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