Chevrolet Silverado / GMC Sierra. Manual — part 2115
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 Mechanical Specifications (RPO
L92 VIN 8) .
Measuring Connecting Rod Bearing Clearance - Gaging Plastic Method
Fig. 15: View Of Gaging Plastic Installed On Crankshaft Journal
Courtesy of GENERAL MOTORS CORP.
IMPORTANT:
Connecting rod bearings are a precision insert type.
Connecting rods are of a powdered metal design and
cannot be shimmed or filed for bearing fit. If clearances
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. Remove the bearing cap, bearing half, and bolts. Refer to Piston, Connecting Rod, and
Bearing Removal .
2. Install the gaging plastic onto the connecting rod bearing journal. Install the gaging plastic
the full width of the journal.
3. Install the bearing cap, bearing half, and bolts. Refer to Piston, Connecting Rod, and
Bearing Installation.
4. Remove the bearing cap, bearing half, and bolts. Refer to Piston, Connecting Rod, and
Bearing Removal .
are found to be excessive, a new bearing and/or
connecting rod is required.
Do not rotate the crankshaft while gaging plastic is
between the crankshaft journal and the bearing surface.
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. 16: Measuring Gaging Plastic
Courtesy of GENERAL MOTORS CORP.
5. Using the scale supplied with the plastic gaging kit, measure the gaging plastic at its widest
area. 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 Mechanical Specifications (RPO L92 VIN 8) .
Measuring Connecting Rod Bearing Clearance - Using J 43690/J 43690-100
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
J 43690 and J 43690-100 have been developed as a more accurate method to measure connecting
rod bearing clearances. See Special Tools . The instructions below provide an overview of tool
set-up and usage. For more detailed information, refer to the tool instruction sheets supplied by
the tool manufacturer.
Fig. 17: Identifying Rod Bearing Clearance Checking Tool
Courtesy of GENERAL MOTORS CORP.
Rod Bearing Checking Tool
J 43690-20 Swivel Base (1)
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
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