Cylinder Head Gasket - Failure

Number 82-T-103A Section 6B Date 9/84

Subject: CYLINDER HEAD GASKET FAILURE 1982 V-6 LT7 DIESEL ENGINE

1982 model V-6 diesel 6000's were built with a slightly different cooling system than 1983 and 1984 models. The later models have a coolant bypass system. This system chances coolant flow through the engine during closed thermostat operation and reduces thermostat cycling. Under some driving and temperature conditions, this may contribute to a head gasket failure. Therefore, if a head gasket failure is encountered, replace both head gaskets and install the coolant bypass system as outlined. Use the head gaskets listed in the kits below.

Diesel cylinder heads often exhibit hairline cracks between the intake and exhaust valve seats. This is not considered unusual and this condition does not require replacement of the cylinder heads.

DIAGNOSIS

Failure of a head gasket may result in either or both of these conditions:

1. Compression gases leaking into the coolant which is evident by bubbles coming out of the coolant overflow hose.

2. Compression leak between the head and block at the end of the head. This makes a popping or hissing sound.

SERVICE PROCEDURE

1. Replace the head gaskets as outlined in the service manual. Use Overhaul Gasket Kit No. 22527056 or Cylinder Head Gasket Kit No. 22527055.

2. Remove the Fan Control Sensor from the intake manifold. Apply a sealer such as part no. 1050026 or equivalent to the threads of fitting, part no. 22519880 and install in the intake manifold as shown in Item 1 in Figure 1. Apply sealer to the Fan Control Sensor threads and install in the fitting.

3. Remove the water outlet. Remove the thermostat and install a 82~C. (180~F.) thermostat, part no. 3054228.

FIGURE 1 - WITH AIR CONDITIONING:

4. Remove the heater-to-pump pipe and install pipe no. 22520032, shown as Item 2 in Figure 1.

FIGURE 1 - WITH AIR CONDITIONING:

FIGURE 2 - WITHOUT AIR CONDITIONING:

5. Install fitting-to-pipe hose shown as item 3 in Figure 1 or 2 as applicable. Install the straps or clamps as shown.
With Air Conditioning (Figure 1)

Hose Asm. 22521633 Hose Clamps (2) 14052374 Straps (2) 11504726
Without Air Conditioninq (Figure 2)

Hose Asm. 22521633 Hose Clamps (2) 14052374 Clamp 3017087
WARRANTY INFORMATION
Labor Labor Trouble
Description Operation Hours Code

Replace Cylinder T4077 8.5 92
Head Gasket & Install Bypass System

With Air Conditioning add: .4

Includes: Diagnosis, replacement of both head gaskets and installation of bypass system.