Chevrolet Silverado / GMC Sierra. Service manual — part 2140

Fig. 95: Measuring Valve Spring Tension
Courtesy of GENERAL MOTORS CORP.

4. Use the J 9666 in order to measure the valve spring tension. See Special Tools . Refer to

Engine Mechanical Specifications (RPO LY5 VIN J) or Engine Mechanical
Specifications (RPO LC9 VIN 3) or Engine Mechanical Specifications (RPO LY2
VIN C) or Engine Mechanical Specifications (RPO LH6 VIN M) or Engine
Mechanical Specifications (RPO LMG VIN 0) or Engine Mechanical Specifications
(RPO LY6 VIN K) or Engine Mechanical Specifications (RPO L76 VIN Y) or Engine

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

Mechanical Specifications (RPO L92 VIN 8) .

VALVE GUIDE REAMING, AND VALVE AND SEAT GRINDING

Tools Required

J 37378-1 Valve Guide Reamer. See Special Tools .

Valve Guide Reaming

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

Fig. 96: Measuring Valve Stem-To-Guide Clearance
Courtesy of GENERAL MOTORS CORP.

NOTE:

Excessive valve stem-to-guide clearance may cause a noisy
valve train, premature valve stem oil seal wear, component

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

1. Using a dial indicator, measure the valve stem-to-guide clearance. Position the tip of the dial

indicator at the top of the valve guide.

Valve stem-to-guide clearance may also be obtained by using a micrometer to measure the
valve stem diameter and a ball type measuring gage to measure the guide bore.

damage, and/or excessive engine oil consumption.

NOTE:

Insufficient valve stem-to-guide clearance will result in noisy
or sticking valves. Valves that are too tight may disturb engine
smoothness or lead to component damage.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado