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Contents

Wiring diagrams Section: Mechanical

Engine Mechanical - 4.3L (LV1 LV3) - Component Locator

Engine Mechanical - 4.3L (LV1 LV3) - Diagnostic Information and Procedures: Overview
Engine Mechanical - 4.3L (LV1 LV3) - Diagnostic Information and Procedures: Diagnosis
Engine Mechanical - 4.3L (LV1 LV3) - Diagnostic Information and Procedures: NVH
Engine Mechanical - 4.3L (LV1 LV3) - Diagnostic Information and Procedures: Other

Engine Mechanical - 4.3L (LV1 LV3) - Repair Instructions - on Vehicle

Engine Mechanical - 5.3L (L83) or 6.2L (L86) - Special Tools and Equipment

Engine Mechanical - 4.3L (LV1 LV3) - Special Tools and Equipment

Engine Mechanical - 4.3L (LV1 LV3) - Schematic Wiring Diagrams

Engine Mechanical - 4.3L (LV1 LV3) - DTC Index

Engine Mechanical - 5.3L (L83) or 6.2L (L86) - Schematic Wiring Diagrams

Engine Mechanical - 5.3L (L83) or 6.2L (L86) - Component Locator

Engine Mechanical - 5.3L (L83) or 6.2L (L86) - Valve Guide Reaming, and Valve and Seat Grinding

Engine Mechanical - 5.3L (L83) or 6.2L (L86) - DTC Index

All sections

Engine Mechanical - 4.3L (LV1 LV3) - Specifications: Specifications GMC Sierra III

Mechanical

Fastener Tightening Specifications

Application	Specification
Application	Metric	English
Accessory Drive Belt Idler Pulley Bolt	58	43 lb ft
Accessory Drive Belt Tensioner Bolts	58	43 lb ft
Automatic Transmission Flex Plate Bolts 1
First Pass 1	30 1	22 lb ft 1
Final Pass 1	45 degrees 1
Flywheel Bolts 1
First Pass 1	30 1	22 lb ft 1
Final Pass 1	45 degrees
Camshaft Position (CMP) Actuator Magnet Bolts	10 1	88 lb in 1
Camshaft Position (CMP) Actuator Solenoid Valve 1
First Pass 1	65 1	48 lb ft 1
Final Pass 1	90 degrees 1
Camshaft Position (CMP) Sensor Bolt	25	18 lb ft
Camshaft Position (CMP) Sensor Wire Harness Bolt	25	18 lb ft
Camshaft Retainer Bolts - TORX Head Bolts	15	11 lb ft
Balance Shaft Idler Sprocket Bolt	58	43 lb ft
Balance Shaft Retainer Bolt	10	88 lb in
Balance Shaft Driven Sprocket Bolt	58	43 lb ft
Balance Shaft Chain Guide Bolts	10	88 lb in
Connecting Rod Bolts
First Pass	20	15 lb ft
Final Pass	85 degrees
Coolant Temperature Sensor	20	15 lb ft
Crankshaft Balancer Bolt - Installation Pass with Used Bolt - to Ensure the Balancer is Completely Installed	330	243 lb ft
Crankshaft Balancer Bolt - New Bolt P/N 11570046 1
First Pass 1	150 1	111 lb ft 1
Second Pass 1	Loosen 360 degrees 1
Third Pass 1	80 1	59 lb ft 1
Final Step 1	200 degrees 1
Crankshaft Bearing Cap Bolts 1
Inner Bearing Cap Bolts - First Pass in Sequence 1	20 1	15 lb ft 1
Inner Bearing Cap Bolts - Final Pass in Sequence 1	110 degrees 1
Outer Bearing Cap Bolts - First Pass in Sequence 1	20 1	15 lb ft 1
Outer Bearing Cap Bolts - Final Pass in Sequence 1	80 degrees 1
Bearing Cap Side Bolts - First Pass in Sequence 1	30 1	22 lb ft 1
Bearing Cap Side Bolts - Final Pass in Sequence 1	60 degrees 1
Crankshaft Oil Deflector Bolts	10	88 lb in
Crankshaft Position (CKP) Sensor Bolt	25	18 lb ft
Crankshaft Rear Oil Seal Housing Bolts	25	18 lb ft
Cylinder Head Bolts 1
Cylinder Head Bolts - First Pass in Sequence 1	80 1	59 lb ft 1
Cylinder Head Bolts - Second Pass in Sequence 1	90 degrees 1
Cylinder Head Bolts - Final Pass in Sequence 1	60 degrees 1
Engine Block Coolant Drain Hole Plug	60	44 lb ft
Engine Block Coolant Heater	50	37 lb ft
Engine Block Oil Gallery Plugs	30	22 lb ft
Exhaust Manifold Bolts
Exhaust Manifold Bolts - If installing on existing cylinder head	23	17 lb ft
Exhaust Manifold Bolts - If installing on NEW cylinder head	27	20 lb ft
Exhaust Manifold Heat Shield Bolts	10	88 lb in
Engine Oil Cooler Adapter	12	106 lb in
Front Cover Bolts	25	18 lb ft
Low Pressure Fuel Feed Pipe to Rocker Arm Cover Bolt	10	88 lb in
Fuel Pump Bolts	25	18 lb ft
High Pressure Fuel Feed Pipe Fittings 1	30 1	22 lb ft 1
Low Pressure Fuel Feed Pipe to Rocker Arm Cover Bolt	10	88 lb in
Fuel Injection Fuel Rail Bolts	25	18 lb ft
Fuel Injection Fuel Rail Crossover Pipe Bolt	10	88 lb in
Fuel Pump Lifter Follower Guide Bolt	25	18 lb ft
Generator Bracket Bolts	50	37 lb ft
Ignition Coil Bracket-to-Valve Rocker Arm Cover Bolts	10	88 lb in
Intake Manifold Bolts
First Pass in Sequence	5	44 lb in
Final Pass in Sequence	10	88 lb in
Intake Manifold Cover Studs	4.5	40 lb in
Intake Manifold Cover Bolts	4.5	40 lb in
Knock Sensor Bolts	25	18 lb ft
Knock Sensor Heat Shield Bolt	25	18 lb ft
Oil Filter	30	22 lb ft
Oil Filter Fitting	55	41 lb ft
Oil Filter Center Tube Bolt - Outside Oil Pan	10	88 lb in
Oil Filter Center Tube Bolt - Inside Oil Pan	10	88 lb in
Oil Level Indicator Tube Bolt	10	88 lb in
Oil Pan Cover Bolts	10	88 lb in
Oil Pan Drain Plug	25	18 lb ft
Oil Pan Bolts - Oil Pan-to-Rear Housing	12	106 lb in
Oil Pan Bolts - Oil Pan-to-Rear Housing	12	106 lb in
Oil Pan Bolts - Oil Pan-to-Engine Block and Oil Pan-to-Front Cover	25	18 lb ft
Oil Pan Bolts - Lower Oil Pan to Upper Oil Pan	10	88 lb in
Oil Pressure Sensor	35	26 lb ft
Oil Level Sensor Bolts	10	88 lb in
Oil Pump Screen Bolts	10	88 lb in
Oil Pump-to-Engine Block Bolts	25	18 lb ft
PCV Valve	6	53 lb in
Spark Plugs	20	15 lb ft
Throttle Body Bolts	10	88 lb in
Map Sensor Bolt	4.5	40 lb in
Evap Purge Valve Bolt	4.5	40 lb in
Timing Chain Tensioner Bolts	25	18 lb ft
Valley Cover Bolts	25	18 lb ft
Valve Lifter Guide Bolts	12	106 lb in
Valve Lifter Oil Manifold Bolts	25	18 lb ft
Valve Lifter Oil Manifold Filter Plug	30	22 lb ft
Valve Rocker Arm Bolts	30	22 lb ft
Valve Rocker Arm Cover Bolts - In Sequence	10	88 lb in
Water Inlet Housing Bolts	10	88 lb in
Water Pump Impeller Bolts	10	88 lb in
Engine Coolant Manifold Bolts	25	18 lb ft
Vacuum Pump Bolt	25	18 lb ft
Starter Heat Shield Bolt - Side	10	88 lb in
Starter Heat Shield Bolt - Rear	25	18 lb ft
1 Use NEW fastener.

Fastener Tightening Specifications

Engine Mechanical Specifications

Application	Specification
Application	Metric	English
General
Engine Type	V6
Displacement	4.3L	262 CID
RPO	LV3
VIN	H
Bore	99.6 mm	3.92 in
Stroke	92.0 mm	3.622 in
Compression Ratio	11.0:1
Firing Order	1-6-5-4-3-2
Spark Plug Gap	0.95-1.10 mm	0.037-0.043 in
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
Camshaft Bearing Bore 1 and 3 Diameter	59.08-59.13 mm	2.325-2.327 in
Camshaft Bearing Bore 2 and 4 Diameter	58.58-58.63 mm	2.306-2.308 in
Crankshaft Main Bearing Bore Diameter	69.870-69.890 mm	2.75-2.751 in
Crankshaft Main Bearing Bore Out-of-Round	0.008 mm	0.0003 in
Cylinder Bore Diameter	99.590-99.610 mm	3.920-3.921 in
Cylinder Head Deck Height - Measuring from the Centerline of Crankshaft to the Deck Face	234.58-234.832 mm	9.235-9.245 in
Cylinder Head Deck Surface Flatness - Measured Within a 25 mm (.984 in) Area	0.025 mm	0.0009 in
Cylinder Head Deck Surface Flatness - Measured between bolt holes	0.03 mm	0.001 in
Cylinder Head Deck Surface Flatness - Measured Within a 150 mm(5.90 in) Area	0.05 mm	0.001 in
Cylinder Head Deck Surface Flatness - Measuring the Overall Length of the Block Deck	0.1 mm	0.003 in
Valve Lifter Bore Diameter	21.417-21.443 mm	0.843-0.844 in
Camshaft
Camshaft End Play	0.025-0.305 mm	0.001-0.012 in
Camshaft Journal Diameter	54.99-55.015 mm	2.164-2.166 in
Camshaft Bearing Diameter	55.063-55.088 mm	2.1678-2.1688 in
Camshaft Journal-to-Bearing Clearance	0.048-0.098 mm	0.0002-0.0038 in
Camshaft Journal Out-of-Round	0.06 mm	0.0002 in
Camshaft Lobe Lift - Exhaust Non AFM	6.97 mm	0.274 in
Camshaft Lobe Lift - Exhaust AFM	7.10 mm	0.279 in
Camshaft Lobe Lift - Intake Non AFM	7.08 mm	0.278 in
Camshaft Lobe Lift - Intake AFM	7.21 mm	0.283 in
Camshaft Lobe Lift - Fuel Pump	5.70 mm	0.224 in
Camshaft Runout - Measured at the Intermediate Journals	0.05 mm	0.002 in
Camshaft Position Actuator
Range of Authority	62 degrees
Park Position	7 degrees Advanced
Connecting Rod
Connecting Rod Bearing Clearance - Production	0.024-0.064 mm	0.0009-0.0025 in
Connecting Rod Bearing Clearance - Service	0.024-0.075 mm	0.0009-0.003 in
Connecting Rod Bore Diameter - Bearing End	56.505-56.525 mm	2.224-2.225 in
Connecting Rod Bore Out-of-Round - Bearing End - Production	0.004-0.008 mm	0.00157-0.00314 in
Connecting Rod Bore Out-of-Round - Bearing End - Service	0.004-0.008 mm	0.00157-0.00314 in
Connecting Rod Side Clearance	0.170-0.430 mm	0.0067-0.017 in
Crankshaft
Connecting Rod Journal Diameter - Production	53.320-53.336 mm	2.0991-2.0999 in
Connecting Rod Journal Diameter - Service	53.31 mm	2.0987 in
Connecting Rod Journal Out-of-Round - Production	0.005 mm	0.0002 in
Connecting Rod Journal Out-of-Round - Service	0.01 mm	0.0004 in
Connecting Rod Journal Diametrical Taper - Maximum for 1/2 of Journal Length - Production	0.008 mm	0.0003 in
Connecting Rod Journal Diametrical Taper - Maximum for 1/2 of Journal Length - Service	0.015 mm	0.00059 in
Crankshaft End Play	0.04-0.22 mm	0.001-0.0086 in
Crankshaft Main Bearing Clearance - Production	0.02-0.052 mm	0.0008-0.0021 in
Crankshaft Main Bearing Clearance - Service	0.02-0.065 mm	0.0008-0.0025 in
Crankshaft Main Journal Diameter - Production	64.992-65.008 mm	2.558-2.559 in
Crankshaft Main Journal Diameter - Service	64.982 mm	2.558 in
Crankshaft Main Journal Out-of-Round - Production	0.005 mm	0.00019 in
Crankshaft Main Journal Out-of-Round - Service	0.001 mm	0.00003 in
Crankshaft Main Journal Diametrical Taper - Production	0.008 mm	0.0003 in
Crankshaft Main Journal Diametrical Taper - Service	0.015 mm	0.0006 in
Crankshaft Rear Flange Runout	0.025 mm	0.00098 in
Crankshaft Reluctor Ring Runout - Measured 1.0 mm (0.04 in) Below Tooth Diameter	0.7 mm	0.028 in
Crankshaft Thrust Surface - Production	26.14-26.22 mm	1.029-1.0315 in
Crankshaft Thrust Surface - Service	26.22 mm	1.0315 in
Crankshaft Thrust Surface Runout	0.04 mm	0.0016 in
Cylinder Head
Cylinder Head Height/Thickness - Measured from the Cylinder Head Deck to the Valve Rocker Arm Cover Seal Surface	132.5 mm	5.216 in
Surface Flatness - Block Deck - Measured Within a 152.4 mm (6.0 in) Area	0.05 mm	0.0019 in
Surface Flatness - Block Deck - Measuring the Overall Length of the Cylinder Head	0.1 mm	0.004 in
Surface Flatness - Exhaust Manifold Deck Face	0.1 mm	0.004 in
Surface Flatness - Intake Manifold Deck Face	0.1 mm	0.004 in
Valve Guide Installed Height - Measured from the Spring Seat Surface to the Top of the Guide	17.05-17.55 mm	0.671-0.691 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 - Measured at Gasket Sealing Surfaces and Measured Within a 200 mm (7.87 in) Area that Includes 2 Runner Port Openings	0.3 mm	0.118 in
Lubrication System
Oil Capacity - with Filter	6.2 liters	6.5 quarts
Oil Capacity - without Filter	5.7 liters	6.0 quarts
Oil Pressure - Minimum - Hot	152 kPa at 1, 000 engine RPM 207 kPa at 2, 000 engine RPM 228 kPa at 3, 000 engine RPM	22 psig at 1, 000 engine RPM 30 psig at 2, 000 engine RPM 33 psig at 3, 000 engine RPM
Active Fuel Management Relief Valve Oil Pressure - as Measured at Oil Pressure Sensor Location	379-517 kPa Maximum	55-75 psig Maximum
Oil Pan
Front Cover Alignment - at Oil Pan Surface	0.0-0.5 mm	0.0-0.02 in
Crankshaft Rear Oil Seal Housing Alignment - at Oil Pan Surface	0.0-0.5 mm	0.0-0.02 in
Oil Pan Alignment - to Rear of Engine Block at Transmission Bell Housing Mounting Surface	0.0-0.1 mm	0.0-0.004 in
Piston Rings
Piston Ring End Gap - First Compression Ring - Measured in Cylinder Bore - Production	0.20-0.36 mm	0.008-0.014 in
Piston Ring End Gap - First Compression Ring - Measured in Cylinder Bore - Service	0.20-0.42 mm	0.008-0.016 in
Piston Ring End Gap - Second Compression Ring - Measured in Cylinder Bore - Production	0.37-0.63 mm	0.015-0.025 in
Piston Ring End Gap - Second Compression Ring - Measured in Cylinder Bore - Service	0.37-0.69 mm	0.015-0.027 in
Piston Ring End Gap - Oil Control Ring - Measured in Cylinder Bore - Production	0.15-0.73 mm	0.006-0.029 in
Piston Ring End Gap - Oil Control Ring - Measured in Cylinder Bore - Service	0.15-0.79 mm	0.006-0.031 in
Piston Ring-to-Groove Clearance - First Compression Ring - Production	0.04-0.083 mm	0.0016-0.0033 in
Piston Ring-to-Groove Clearance - First Compression Ring - Service	0.04-0.083 mm	0.0016-0.0033 in
Piston Ring-to-Groove Clearance - Second Compression Ring - Production	0.04-0.083 mm	0.0016-0.0033 in
Piston Ring-to-Groove Clearance - Second Compression Ring - Service	0.04-0.083 mm	0.0016-0.0033 in
Piston Ring-to-Groove Clearance - Oil Control Ring - Production	0.013-0.201 mm	0.0005-0.0079 in
Piston Ring-to-Groove Clearance - Oil Control Ring - Service	0.013-0.201 mm	0.0005-0.0079 in
Pistons and Pins
Pin - Piston Pin Clearance-to-Piston Pin Bore - Production	0.002-0.010 mm	0.0001-0.0004 in
Pin - Piston Pin Clearance-to-Piston Pin Bore - Service	0.002-0.015 mm	0.0001-0.0006 in
Pin - Piston Pin Diameter	23.952-23.955 mm	0.9430-0.9431 in
Pin - Piston Pin Fit in Connecting Rod Bore - Production	0.007-0.020 mm	0.00028-0.00079 in
Pin - Piston Pin Fit in Connecting Rod Bore - Service	0.007-0.022 mm	0.00028-0.00087 in
Piston - Piston Diameter - Measured Over Skirt Coating	99.608-99.639 mm	3.9216-3.9228 in
Piston - Piston-to-Bore Clearance - Production	0.048 to +0.001 mm	0.0019 to +0.000 in
Piston - Piston-to-Bore Clearance - Service Limit with Skirt Coating Worn Off	0.052 mm	0.0020 in
Valve System
Valves - Valve Face Angle	45 degrees
Valves - Valve Face Width	1.25 mm	0.05 in
Valves - Valve Lash	Net Lash - No Adjustment
Valve Lift - Exhaust Non AFM	12.5 mm	0.492 in
Valve Lift - Exhaust AFM	12.753 mm	0.502 in
Valve Lift - Intake Non AFM	12.700 mm	0.499 in
Valve Lift - Intake AFM	12.953 mm	0.509 in
Valves - Valve Seat Angle	45 degrees
Valves - Valve Seat Runout	0.05 mm	0.002 in
Valves - Valve Seat Width - Exhaust	2.52 mm	0.099 in
Valves - Valve Seat Width - Intake	2.00 mm	0.078 in
Valves - Valve Stem Diameter - Production	7.955-7.976 mm	0.313-0.314 in
Valves - Valve Stem Diameter - Service	7.95 mm	0.313 in
Valves - Valve Stem-to-Guide Clearance - Production - Exhaust	0.025-0.066 mm	0.001-0.0026 in
Valves - Valve Stem-to-Guide Clearance - Service - Exhaust	0.093 mm	0.0037 in
Valves - Valve Stem-to-Guide Clearance - Production - Intake	0.025-0.066 mm	0.001-0.0026 in
Valves - Valve Stem-to-Guide Clearance - Service - Intake	0.093 mm	0.0037 in
Valves - Valve Stem Height - Measured from Spring Seat - Intake and Exhaust	51.715-52.465 mm	2.036-2.065 in
Rocker Arms - Valve Rocker Arm Ratio	1.80:1
Valve Springs - Valve Spring Free Length	57.0 mm	2.24 in
Valve Springs - Valve Spring Installed Height	45.75 mm	1.88 in
Valve Springs - Valve Spring Load - Closed	40040 N at 45.75 mm	90 lb at 1.88 in
Valve Springs - Valve Spring Load - Open	1175 N at 35.05 mm	264 lb at 1.38 in

Engine Mechanical Specifications

Engine Content Specifications

RPO	VIN	Displacement	Camshaft Position (CMP) Actuator Control System	Active Fuel Management Control System	E85 Capable	Block Material
LV1	P	4.3L	Yes	No	No	Aluminum
LV3	H	4.3L	Yes	Yes	Yes	Aluminum

Engine Content Specifications