2003-2010 Chevrolet Express Service & Repair Manual

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado SPECIFICATIONS FASTENER TIGHTENING SPECIFICATIONS Application Specification Metric English Accelerator Control Cable Bracket Nut to Stud 12 N.m 106 lb in Accelerator Control Cable Bracket Nut to Throttle Body 9 N.m 80 lb in Accelerator Control Cable Bracket Stud to Intake Manifold 6 N.m 53 lb in Accelerator Control Cable Bracket Stud to Throttle Body 12 N.m 106 lb in Air Cleaner Adapter Stud 8 N.m 71 lb in Balance Shaft Driven Gear Bolt  First Pass 20 N.m 15 lb ft  Final Pass 35 degrees Balance Shaft Retainer Bolt 12 N.m 106 lb in Battery Cable Bracket Bolt to Oil Pan 12 N.m 106 lb in Battery Negative Cable Bolt to Engine 25 N.m 18 lb ft Battery Positive Cable Junction Block Bracket Bolt 25 N.m 18 lb ft Belt Idler Pulley Bolt 50 N.m 37 lb ft Camshaft Retainer Bolt 12 N.m 106 lb in Camshaft Sensor Bolt N.m lb ft Camshaft Sprocket Bolt 25 N.m 18 lb ft Connecting Rod Bolt  First Pass 20 N.m 15 lb ft  Final Pass 100 degrees Crankshaft Balancer Bolt 95 N.m 70 lb ft Crankshaft Bearing Cap Bolt - Preferred Method  First Pass 20 N.m 15 lb ft  Final Pass 73 degrees 2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado 2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Crankshaft Bearing Cap Bolt 105 N.m 77 lb ft Crankshaft Position Sensor Bolt 9 N.m 80 lb in Crankshaft Pulley Bolt 58 N.m 43 lb ft Crankshaft Rear Oil Seal Housing Bolt and Nut 12 N.m 106 lb in Crankshaft Rear Oil Seal Housing Retainer Stud 6 N.m 53 lb in Crossmember Bolt 100 N.m 74 lb ft Cylinder Head Bolt - Preferred Method  All Bolts First Pass in Sequence 30 N.m 22 lb ft  Long Bolts Final Pass in Sequence 75 degrees  Medium Bolts Final Pass in Sequence 65 degrees  Short Bolts Final Pass in Sequence 55 degrees Cylinder Head Core Hole Plug 20 N.m 15 lb ft Distributor Cap Bolt 2.4 N.m 21 lb in Distributor Clamp Bolt 25 N.m 18 lb ft Drive Belt Idler Pulley Bolt 50 N.m 37 lb ft Drive Belt Tensioner Bolt 50 N.m 37 lb ft Engine Block Left Side Oil Gallery Plug 20 N.m 15 lb ft Engine Block Left Rear Oil Gallery Plug 30 N.m 22 lb ft Engine Block Right Rear Oil Gallery Plug 20 N.m 15 lb ft Engine Block Coolant Drain Hole Plug 20 N.m 15 lb ft Engine Block Oil Gallery Plug 20 N.m 15 lb ft Engine Coolant Heater Bolt/Screw 2 N.m 18 lb in Engine Coolant Temperature (ECT) Sensor 20 N.m 15 lb ft Engine Flywheel Bolt 100 N.m 74 lb ft Engine Front Cover Bolt 12 N.m 106 lb in Engine Lift Front Bracket Stud 35 N.m 26 lb ft Engine Mount Bolt to Engine Bracket 50 N.m 37 lb ft Engine Mount Engine Bracket Bolt to Engine 50 N.m 37 lb ft Engine Mount Frame Bracket Through-bolt 75 N.m 55 lb ft Engine Mount Frame Side Mount Bolt 65 N.m 50 lb ft Engine Oil Level Sensor 13 N.m 115 lb in Engine Oil Pressure Gage Sensor 30 N.m 22 lb ft Engine Oil Pressure Gage Sensor Fitting - Plus Required Angle 15 N.m 11 lb ft 2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Engine Shield Bolt 20 N.m 15 lb ft Engine Wiring Harness Bracket Bolt to Battery Positive Cable Junction Block Bracket 9 N.m 80 lb in Engine Wiring Harness Bracket Bolt to Generator and Drive Belt Tensioner Bracket 25 N.m 18 lb ft Engine Wiring Harness Bracket Nut to Evaporative Emission (EVAP) Canister Purge Solenoid Valve Stud 9 N.m 80 lb in Engine Wiring Harness Bracket Nut to Intake Manifold Stud 12 N.m 106 lb in Engine Wiring Harness Bracket Stud 25 N.m 18 lb ft Engine Wiring Harness Clip Bolt 9 N.m 80 lb in Engine Wiring Harness Ground Nut 16 N.m 12 lb ft Evaporative Emission (EVAP) Canister Purge Solenoid Valve Stud to Intake Manifold 10 N.m 89 lb in Exhaust Manifold Bolt/Stud  First Pass 15 N.m 11 lb ft  Final Pass 30 N.m 22 lb ft Exhaust Manifold Heat Shield Bolt 9 N.m 80 lb in Fan and Water Pump Pulley Bolt 25 N.m 18 lb ft Frame Cross Bar Bolt 100 N.m 74 lb ft Fuel Meter Body Bracket Bolt 10 N.m 89 lb in Fuel Pipe Bracket Bolt 6 N.m 53 lb in Fuel Pipe Retainer Nut 3 N.m 27 lb in Fuel Supply Pipe Nut - Fuel Tank Side 30 N.m 22 lb ft Generator and Drive Belt Tensioner Bracket Bolt to Engine 41 N.m 30 lb ft Generator and Drive Belt Tensioner Bracket Stud to Engine 20 N.m 15 lb ft Generator and Drive Belt Tensioner Bracket Stud Nut 41 N.m 30 lb ft Ground Wire Bolt to Rear of Left Side Cylinder Head 16 N.m 12 lb ft Ground Wire Nut to Rear of Right Side Cylinder Head 16 N.m 12 lb ft Heater Hose Bracket Bolt to Generator and Drive 2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Belt Tensioner Bracket 25 N.m 18 lb ft Hood Hinge Bolt 25 N.m 18 lb ft Ignition Coil Stud 12 N.m 106 lb in Junction Block Bracket Bolt 25 N.m 18 lb ft Knock Sensor 25 N.m 18 lb ft Lift Bracket Bolts 15 N.m 11 lb ft Lower Intake Manifold Bolt  First Pass in Sequence 3 N.m 27 lb in  Second Pass in Sequence 12 N.m 106 lb in  Final Pass in Sequence 15 N.m 11 lb ft Oil Cooler Pipe Bracket to Oil Pan Bolt 12 N.m 106 lb in Oil Filter 30 N.m 22 lb ft Oil Filter Adapter 55 N.m 41 lb ft Oil Filter Fitting 55 N.m 41 lb ft Oil Level Indicator Tube Bolt 12 N.m 106 lb in Oil Pan Baffle Bolt 12 N.m 106 lb in Oil Pan Bolt and Nut 25 N.m 18 lb ft Oil Pan Drain Plug 25 N.m 18 lb ft Oil Pan Skid Plate Bolt 20 N.m 15 lb ft Oil Pump Bolt to Rear Crankshaft Bearing Cap 90 N.m 66 lb ft Oil Pump Cover Bolt 12 N.m 106 lb in Positive Battery Cable Clip Bolt 9 N.m 80 lb in Positive Cable Generator Nut 18 N.m 13 lb ft Power Steering Pump Bracket Bolt to Engine 41 N.m 30 lb ft Power Steering Pump Bracket Stud to Engine 20 N.m 15 lb ft Power Steering Pump Bracket Stud Nut 41 N.m 30 lb ft Power Steering Pump Bolt 50 N.m 37 lb ft Power Steering Pump Nut to Engine - Rear Bracket to Engine 41 N.m 30 lb ft Power Steering Pump Rear Bracket Nut 50 N.m 37 lb ft Secondary Air Injection (AIR) Check Valve Pipe Bracket Bolt to Exhaust Manifold 10 N.m 89 lb in Secondary Air Injection (AIR) Check Valve Pipe Stud Nut 25 N.m 18 lb ft Spark Plug 15 N.m 11 lb ft 2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

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

SEALERS, ADHESIVES, AND LUBRICANTS  Pin - Piston Pin Diameter 23.545-23.548 mm 0.9270-0.9271 in Valve System  Valves - Valve Face Angle 45 degrees  Valves - Valve Seat Angle 46 degrees  Valves - Valve Seat Runout 0.05 mm 0.002 in  Valves - Valve Seat Width - Intake 1.016-1.651 mm 0.040-0.065 in  Valves - Valve Seat Width - Exhaust 1.651-2.489 mm 0.065-0.098 in  Valves - Valve Stem Oil Seal Installed Height 1-2 mm 0.03937-0.07874 in  Valves - Valve Stem-to-Guide Clearance - Intake - Production 0.025-0.069 mm 0.0010-0.0027 in  Valves - Valve Stem-to-Guide Clearance - Intake - Service 0.025-0.094 mm 0.0010-0.0037 in  Valves - Valve Stem-to-Guide Clearance - Exhaust - Production 0.025-0.069 mm 0.0010-0.0027 in  Valves - Valve Stem-to-Guide Clearance - Exhaust - Service 0.025-0.094 mm 0.0010-0.0037 in  Rocker Arms - Valve Rocker Arm Ratio 1.5:1  Valve Springs - Valve Spring Free Length 51.3 mm 2.02 in  Valve Springs - Valve Spring Installed Height - Intake 42.92-43.43 mm 1.670-1.700 in  Valve Springs - Valve Spring Installed Height - Exhaust 42.92-43.43 mm 1.670-1.700 in  Valve Springs - Valve Spring Load - Closed 338-374 N @ 43.2 mm 76-84 lb @ 1.70 in  Valve Springs - Valve Spring Load - Open 832-903 N @ 32.3 mm 187-203 lb @ 1.27 in Application Type of Material GM Part Number United States Canada Balancer Shaft Driven Gear Bolt Threadlock 12345382 10953489 2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Camshaft Retainer Bolt Threadlock 12345382 10953489 Crankshaft Balancer Keyway Adhesive 12346141 10953433 Cylinder Head Bolt Sealant 12346004 10953480 Engine Block to the Crankshaft Rear Oil Seal Housing Junction at the Oil Pan Sealing Surfaces Adhesive 12346141 10953433 Engine Block to the Engine Front Cover Junction at the Oil Pan Sealing Surfaces Adhesive 12346141 10953433 Engine Block at the Lower Intake Manifold Sealing Surfaces Adhesive 12346141 10953433 Engine Block Coolant Drain Hole Plug Sealant 12346004 10953480 Engine Block Core Hole Plug Threadlock 12345382 10953489 Engine Block Oil Gallery Plug Sealant 12346004 10953480 Engine Coolant Temperature (ECT) Gage Sensor Sealant 12346004 10953480 Engine Coolant Temperature (ECT) Sensor Sealant 12346004 10953480 Engine Oil SAE 5W-30 Oil 12345610 993193 Engine Oil Pressure Sensor Sealant 12346004 10953480 Engine Oil Pressure Sensor Fitting Sealant 12346004 10953480 Engine Oil Supplement Lubricant 1052367 992367 Evaporative Emission (EVAP) Canister Purge Solenoid Valve Stud Threadlock 12345382 10953489 Exhaust Manifold Bolt/Stud Threadlock 12345493 10953488 Expansion Cup Plug - Balance Shaft Rear Bearing Hole Sealant 12346004 10953480 Expansion Cup Plug - Camshaft Rear Bearing Hole Sealant 12346004 10953480 Fuel Meter Body Bracket Bolt Threadlock 12345382 10953489 Fuel Pipe Bolt Threadlock 12345382 10953489 Lower Intake Manifold Bolt Threadlock 12345382 10953489 Oil Level Indicator Tube Sealant 12346004 10953480 Oil Pump Screen Tube Sealant 12346004 10953480 Throttle Body Stud Threadlock 12345382 10953489 Upper Intake Manifold Stud Threadlock 12345382 10953489 Valve Train Component Prelube Lubricant 12345501 992704 2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

2003-2010 Chevrolet Express Service & Repair Manual

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