Incorrect Substitution of the 12 Point Cylinder Head Bolt on all G3500 and 3500 Engines {1100} Caterpillar

Incorrect Substitution of the 12 Point Cylinder Head Bolt on all G3500 and 3500 Engines {1100}

Usage:

Engine Commercial: G3500 Family
Engine Commercial Electronic: G3500 Family
Engine Generator Set: G3500 Family
Engine Marine: G3500 Family
Engine Commercial: 3500B and 3500C
Engine Commercial Electronic: 3500B and 3500C
Engine Generator Set: 3500B and 3500C
Engine Marine: 3500B and 3500C
Engine Commercial: 3500 Series
Engine Commercial Electronic: 3500 Series
Engine Generator Set: 3500 Series
Engine Marine: 3500 Series
Engine Commercial: 3500 Series
Engine Commercial Electronic: 3500 Series
Engine Generator Set: 3500 Series
Engine Marine: 3500 Series
Machine Engines: 3500B and 3500C High Displacement

Introduction

The problem that is identified below does not have a known permanent solution. Until a permanent solution is known, use the solution that is identified below.

Problem

Service parts incorrectly substituted the 124-1854 Bolt for the 7N-1961 Bolt. The 7N-1961 Bolt uses a higher strength material, and can be substituted for the 124-1854 Bolt, but the 124-1854 Bolt is NOT a suitable substitute for the 7N-1961 Bolt.

Solution

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Illustration 1	g06126025
7N-1961 Bolt

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Illustration 2	g06126020
124-1854 Bolt

A freeze has been issued on the 124-1854 Bolt to prevent issuing this bolt to 3500 engine applications. The 7N-1961 Bolt and the 124-1854 Bolt have the same dimensions. The 7N-1961 Bolts can be identified by an F-C marked on the head, refer to Illustration 1. The 124-1854 Bolts will not have the F-C marking on the head, refer to Illustration 2.

If a 124-1854 Bolt has been installed in a G3500 or 3500 Series engine, contact the Dealer Solution Network (DSN) for additional information specific to the application.