Chevrolet Silverado / GMC Sierra. Service manual — part 394

Fig. 21: Lower Rocker Arm Cover (Top View)
Courtesy of GENERAL MOTORS CORP.

Lower Rocker Arm Cover - Top View

Lower Rocker Arm Cover - Side View

Service

Hole

Location

Thread

Size

Drill

Counterbore

Tool

Stop

Collar Tap Driver Insert

Drill

Depth
(Max)

Tap

Depth

(Min)

mm (in) mm (in)

1

M 6 x

1.0

-201

-202

N/A

-203

-204

-205

18 0.709 15 0.591

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 22: Lower Rocker Arm Cover (Side View)
Courtesy of GENERAL MOTORS CORP.

Lower Rocker Arm Cover - Side View

Upper Rocker Arm Cover - Top View

Service

Hole

Location

Thread

Size

Drill

Counterbore

Tool

Stop

Collar Tap Driver Insert

Drill

Depth
(Max)

Tap

Depth

(Min)

mm (in) mm (in)

1

M 8 x

1.25

-206

-207

N/A

-208

-209

-210

21 0.827 17 0.669

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 23: Upper Rocker Arm Cover (Top View)
Courtesy of GENERAL MOTORS CORP.

Upper Rocker Arm Cover - Top View

Upper Rocker Arm Cover - Bottom View

Fig. 24: Upper Rocker Arm Cover (Bottom View)
Courtesy of GENERAL MOTORS CORP.

Upper Rocker Arm Cover - Bottom View

Service

Hole

Location

Thread

Size

Drill

Counterbore

Tool

Stop

Collar Tap Driver Insert

Drill

Depth
(Max)

Tap

Depth

(Min)

mm (in) mm (in)

1

M 5 x

0.8

N/A

N/A

N/A

N/A

N/A

N.A

13 0.512 10 0.394

2

M 8 x

1.25

-206

-207

N/A

-208

-209

-210

21 0.827 17 0.669

3

M 6 x

1.0

-201

-202

N/A

-203

-204

-205

16 0.630 12 0.472

Service

Drill

Depth

Tap

Depth

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Flywheel Housing - Rear View

Fig. 25: Flywheel Housing (Rear View)
Courtesy of GENERAL MOTORS CORP.

Flywheel Housing - Rear View

Hole

Location

Thread

Size

Drill

Counterbore

Tool

Stop

Collar Tap Driver Insert

(Max)

(Min)

mm (in) mm (in)

1

M 5 x

0.8

N/A

N/A

N/A

N/A

N/A

N/A

13 0.512 10 0.394

Service

Hole

Thread

Counterbore Stop

Drill

Depth
(Max)

Tap

Depth

(Min)

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado