Chevrolet Silverado / GMC Sierra. Manual — part 2
ENGINE MECHANICAL SPECIFICATIONS
Spark Plug Wire Support Bolt
12 N.m
106 lb in
Starter Motor Wiring Harness/Transmission Cooler
Pipe Bracket to Oil Pan Bolt
9 N.m
80 lb in
Throttle Body Stud
9 N.m
80 lb in
Torque Converter Bolt
63 N.m
47 lb ft
Transmission Bolt
50 N.m
37 lb ft
Transmission Cover Bolt
12 N.m
106 lb in
Transmission Oil Cooler Line Bracket
9 N.m
80 lb in
Transmission to Oil Pan Bolt
47 N.m
35 lb ft
Upper Intake Manifold Stud
First Pass
5 N.m
44 lb in
Final Pass
9 N.m
80 lb in
Valve Lifter Pushrod Guide Bolt
16 N.m
12 lb ft
Valve Rocker Arm Bolt
30 N.m
22 lb ft
Valve Rocker Arm Cover Bolt
12 N.m
106 lb in
Water Outlet Stud
25 N.m
18 lb ft
Water Pump Bolt
45 N.m
33 lb ft
Application
Specification
Metric
English
General
Engine Type
90 degree V6
Displacement
4.3 L
262 CID
RPO
LU3
VIN
X
Bore
101.60 mm
4.012 in
Stroke
88.39 mm
3.480 in
Compression Ratio
9.2:1
Firing Order
1-6-5-4-3-2
Spark Plug Gap
1.52 mm
0.060 in
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
Balance Shaft
Bearing Journal Diameter - Rear
38.085-38.100 mm 1.4994-1.500 in
Bushing Bore Diameter - Rear
0.050-0.088 mm
0.0020-0.0035 in
Block
Crankshaft Main Bearing Bore Out-of-Round
0.050 mm
0.002 in
Cylinder Bore Diameter
101.618-101.643
mm
4.0007-4.0017 in
Cylinder Bore Out-of-Round - Production
0.017 mm
0.0007 in
Cylinder Bore Out-of-Round - Service
0.05 mm
0.002 in
Cylinder Bore Taper - Production Relief Side
0.025 mm
0.0010 in
Cylinder Bore Taper - Production Thrust Side
0.012 mm
0.0005 in
Cylinder Bore Taper - Service
0.025 mm
0.0010 in
Cylinder Head Deck Surface Flatness
0.050-0.152 mm
0.002-0.006 in
Camshaft
Camshaft End Play
0.0254-0.2286 mm 0.0010-0.0090 in
Camshaft Journal Diameter
47.440-47.490 mm 1.8677-1.8696 in
Camshaft Journal Out-of-Round
0.008 mm
0.0003 in
Camshaft Lobe Lift - Exhaust
7.0953 mm
0.2793 in
Camshaft Lobe Lift - Intake
6.8678 mm
0.2704 in
Camshaft Runout
0.100 mm
0.0039 in
Connecting Rod
Connecting Rod Bearing Clearance -
Production
0.038-0.078 mm
0.0015-0.0031 in
Connecting Rod Bearing Clearance - Service
0.025-0.063 mm
0.0010-0.0025 in
Connecting Rod Side Clearance
0.15-0.44 mm
0.006-0.017 in
Crankshaft
Connecting Rod Journal Diameter
57.116-57.148 mm 2.2487-2.2497 in
Connecting Rod Journal Out-of-Round -
Production
0.008 mm
0.0003 in
Connecting Rod Journal Out-of-Round -
Service
0.025 mm
0.0010 in
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
Connecting Rod Journal Taper - Production
0.010 mm
0.0004 in
Connecting Rod Journal Taper - Service
0.025 mm
0.0010 in
Crankshaft End Play
0.050-0.20 mm
0.002-0.008 in
Crankshaft Main Bearing Clearance #1 -
Production
0.02-0.05 mm
0.0008-0.0020 in
Crankshaft Main Bearing Clearance #2, #3,
and #4 - Production
0.028-0.058 mm
0.0011-0.0023 in
Crankshaft Main Bearing Clearance #1 -
Service
0.0254-0.05 mm
0.0010-0.0020 in
Crankshaft Main Bearing Clearance #2, #3,
and #4 - Service
0.025-0.063 mm
0.0010-0.0025 in
Crankshaft Main Journal Diameter #1
62.199-62.217 mm 2.4488-2.4495 in
Crankshaft Main Journal Diameter #2 and #3 62.191-62.215 mm 2.4485-2.4494 in
Crankshaft Main Journal Diameter #4
62.179-62.203 mm 2.4480-2.4489 in
Crankshaft Main Journal Out-of-Round -
Production
0.005 mm
0.0002 in
Crankshaft Main Journal Out-of-Round -
Service
0.025 mm
0.0010 in
Crankshaft Main Journal Taper
0.007 mm
0.0003 in
Exhaust Manifold
Surface Flatness - Flange to Flange
0.25 mm
0.010 in
Surface Flatness - Individual Flange
0.05 mm
0.002 in
Intake Manifold
Surface Flatness
0.10 mm
0.004 in
Lubrication System
Oil Capacity with Filter
4.3 L
4.5 qt
Oil Capacity without Filter
3.8 L
4 qt
Oil Pressure - at 1,000 RPM
42 kPa
6 psi
Oil Pressure - at 2,000 RPM
125 kPa
18 psi
Oil Pressure - at 4,000 RPM
166 kPa
24 psi
Piston Rings
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
Piston Ring End Gap - First Compression Ring
- Production
0.25-0.40 mm
0.010-0.016 in
Piston Ring End Gap - Second Compression
Ring - Production
0.38-0.58 mm
0.015-0.023 in
Piston Ring End Gap - Oil Control Ring -
Production
0.25-0.76 mm
0.010-0.029 in
Piston Ring End Gap - First Compression Ring
- Service
0.25-0.50 mm
0.010-0.020 in
Piston Ring End Gap - Second Compression
Ring - Service
0.38-0.80 mm
0.015-0.031 in
Piston Ring End Gap - Oil Control Ring -
Service
0.005-0.090 mm
0.0002-0.0035 in
Piston Ring to Groove Clearance - First
Compression Ring - Production
0.030-0.070 mm
0.0012-0.0027 in
Piston Ring to Groove Clearance - Second
Compression Ring - Production
0.076-0.280 mm
0.0030-0.0110 in
Piston Ring to Groove Clearance - Oil Control
Ring - Production
0.046-0.196 mm
0.0018-0.0077 in
Piston Ring to Groove Clearance - First
Compression Ring - Service
0.030-0.085 mm
0.0012-0.0033 in
Piston Ring to Groove Clearance - Second
Compression Ring - Service
0.030-0.085 mm
0.0012-0.0033 in
Piston Ring to Groove Clearance - Oil Control
Ring - Service
0.076-0.200 mm
0.0030-0.0079 in
Pistons and Pins
Piston - Piston to Bore Clearance - Production 0.018-0.061 mm
0.0007-0.0024 in
Piston - Piston to Bore Clearance - Service
0.075 mm
0.0029 in
Pin - Piston Pin Clearance to Connecting Rod
Bore - Press Fit
0.012-0.048 mm
0.0005-0.0019 in
Pin - Piston Pin Clearance to Piston Pin Bore -
Production
0.013-0.023 mm
0.0005-0.0009 in
Pin - Piston Pin Clearance to Piston Pin Bore -
Service
0.025 mm
0.0010 in
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
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