Head Gasket May Fail On Certain Cat® Products {1100} Caterpillar

Compact Track Loader

259D (S/N: FTK1-UP; GTK1-UP; FTL1-UP)

279D (S/N: GTL1-UP; PPT1-UP; RCX1-UP)

289D (S/N: WCT1-UP; TAW1-UP; A9Z1-UP)

Compact Wheel Loader

906M (S/N: H662891-UP; K561-UP)

907M (S/N: H771437-UP; K571-UP)

908M (S/N: H883143-UP; K581-UP)

Mini Hydraulic Excavator

308 (S/N: GG81-UP; GK81-UP; GW81-UP; GX81-UP)

308.5 (S/N: GZ81-UP)

308E2 (S/N: F8C499-UP; FJX11572-UP)

308E2 CR (S/N: MC5689-UP; CE8230-UP; PC8485-UP; W8S353-UP)

308E2SR (S/N: JC51-UP; KC5306-UP)

Multi Terrain Loader

257D (S/N: EML1-UP; FMR1-UP; EZW1-UP)

Skid Steer Loader

236D (S/N: SEN1-UP; MPW1-UP; BGZ1-UP)

242D (S/N: DML1-UP; DZT1-UP; A9W1-UP)

246D (S/N: BYF1-UP; JSL1-UP; HMR1-UP)

262D (S/N: DTB1-UP; KTS1-UP; LST1-UP)

Reference: Torque Specifications, SENR3130

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

The machines listed above may experience head gasket failure. To determine if a head gasket failure has occurred observe the coolant overflow reservoir. If the coolant overflow reservoir shows signs of expansion and is being filled with exhaust gas bubbling, then the head gasket may have failed.

Solution

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Do not operate or work on this product unless you have read and understood the instruction and warnings in the relevant Operation and Maintenance Manuals and relevant service literature. Failure to follow the instructions or heed the warnings could result in injury or death. Proper care is your responsibility.

In the event of failure, replace the failed parts with the same parts and reinstall the components as shown in the steps below.

1. Add 30W engine oil to the bolt threads and the bolt shoulder.

2. Tighten the cylinder head bolts according to the following procedure:
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   Illustration 1	g06391513
   Head bolt torque sequence

   1. Tighten the bolts (1) through (10) to a torque of 35 N·m (26 lb ft).

   2. Tighten the bolts (1) through (10) to a torque of 108 N·m (80 lb ft).

   3. Tighten the bolts (1) through (10) to a torque of 180 N·m (133 lb ft) to 186 N·m (137 lb ft).

Note: The torque specs shown are lower than what is called out currently in the Disassembly and Assembly Manual.