Engine Mechanical - 4.3L (On-Vehicle): Specifications — Chevrolet Silverado 2500 (2000-2004)

Fastener Tightening Specifications

Application	Specification
Application	Metric	English
Accelerator Cable Bracket Nut	12 N.m	106 lb in
Accelerator Control Cable Bracket Nut	9 N.m	80 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	12 N.m	106 lb in
Camshaft Retainer Bolt	12 N.m	106 lb in
Camshaft Sprocket Bolt	25 N.m	18 lb ft
Crankshaft Balancer Bolt	95 N.m	70 lb ft
Crankshaft Position (CKP) Sensor Bolt	8 N.m	71 lb in
Crankshaft Pulley Bolt	58 N.m	43 lb ft
Crankshaft Rear Oil Seal Housing Bolt/Nut	12 N.m	106 lb in
Crossbar Bolt	100 N.m	74 lb ft
Cylinder Head Bolt
First Pass	30 N.m	22 lb ft
Final Pass - Long Bolt (1, 4, 5, 8, 9)	75 degrees
Final Pass - Medium Bolt (12, and 13)	65 degrees
Final Pass - Short Bolt (2, 3, 6, 7, 10, 11)	55 degrees
Drive Belt Idler Pulley Bolt	50 N.m	37 lb ft
Drive Belt Tensioner Bolt	50 N.m	37 lb ft
Engine Coolant Temperature (ECT) Sensor	20 N.m	15 lb ft
Engine Front Cover Bolt	12 N.m	106 lb in
Engine Mount Bolt	50 N.m	37 lb ft
Engine Mount Bracket Bolt	75 N.m	55 lb ft
Engine Mount Side Bracket Bolt	50 N.m	37 lb ft
Engine Mount to Engine Mount Bracket Bolt	65 N.m	48 lb ft
Engine Oil Level Sensor	13 N.m	115 lb in
Engine Shield Bolt	20 N.m	15 lb ft
Engine Wiring Harness Bracket Nut	12 N.m	106 lb in
Engine Wiring Harness Clip Bolt	9 N.m	80 lb in
Engine Wiring Harness Ground Nut	16 N.m	12 lb ft
Engine Wiring Harness Rear Bracket Nut	9 N.m	80 lb in
Evaporative Emission (EVAP) Canister Purge Solenoid Valve Stud	10 N.m	89 lb in
Exhaust Gas Recirculation (EGR) Valve Inlet Pipe Bracket Bolt	25 N.m	18 lb ft
Exhaust Gas Recirculation (EGR) Valve Inlet Pipe Fitting to Exhaust Manifold	25 N.m	18 lb ft
Exhaust Gas Recirculation (EGR) Valve Inlet Pipe Fitting to Intake Manifold	30 N.m	22 lb ft
Flywheel Bolt	100 N.m	74 lb ft
Fuel Pump/Oil Pressure Sensor	30 N.m	22 lb ft
Fuel Pump/Oil Pressure Sensor Fitting	15 N.m	11 lb ft
Centerline of Fitting to Centerline of Crankshaft	50 degrees
Generator Bracket Stud	20 N.m	15 lb ft
Harness Ground Bolt	16 N.m	12 lb ft
Heater Outlet Hose Clip Bolt	25 N.m	18 lb ft
Hood Hinge Bolt	25 N.m	18 lb ft
Intake Manifold - Lower
First Pass	3 N.m	27 lb in
Second Pass	12 N.m	106 lb in
Final Pass	15 N.m	11 lb ft
Intake Manifold - Upper Stud	9 N.m	80 lb in
J 23523-F Bolt	25 N.m	18 lb ft
Junction Block Bracket Bolt	25 N.m	18 lb ft
Lift Bracket Bolts	15 N.m	11 N.m
Oil Filter	30 N.m	22 lb ft
Oil Filter Adapter	55 N.m	41 lb ft
Oil Level Indicator Tube Bolt	12 N.m	106 lb in
Oil Pan Bolt	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	90 N.m	66 lb ft
Positive Cable Generator Nut	18 N.m	13 lb ft
Power Steering (P/S) Pump Bracket Bolt/Nut	41 N.m	30 lb ft
Power Steering (P/S) Pump Bracket Stud	20 N.m	15 lb ft
Spark Plug - New Cylinder Head	30 N.m	22 lb ft
Spark Plug - Used Cylinder Head	15 N.m	11 lb ft
Spark Plug Wire Support Bolt	12 N.m	106 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
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

Fastener Tightening Specifications

Engine Mechanical Specifications

Application	Specification
Application	Metric	English
General Data
Engine Type	V6
RPO Code	L35/LU3
VIN Code	W/X
Displacement	4.3 L	262 CID
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
Oil Pressure - Minimum - at Normal Operating Temperature	42 kPa at 1,000 RPM 125 kPa at 2,000 RPM 166 kPa at 4,000 RPM	6 psig at 1,000 RPM 18 psig at 2,000 RPM 24 psig at 4,000 RPM
Balance Shaft
Rear Bearing Journal Clearance	0.050-0.088 mm	0.0020-0.0035 in
Rear Bearing Journal Diameter	38.085-38.100 mm	1.4994-1.500 in
Camshaft
End Play	0.0254-0.2286 mm	0.0010-0.0090 in
Journal Diameter	47.440-47.490 mm	1.8677-1.8696 in
Journal Diameter Out-of-Round	0.025 mm - Maximum	0.0010 in - Maximum
Lobe Lift - Exhaust	7.20-7.30 mm	0.283-0.287 in
Lobe Lift - Intake	6.97-7.07 mm	0.274-0.278 in
Runout	0.065 mm	0.0026 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 Journal Diameter	57.116-57.148 mm	2.2487-2.2497 in
Connecting Rod Journal Out-of-Round - Production	0.007 mm - Maximum	0.0002 in - Maximum
Connecting Rod Journal Out-of-Round - Service	0.025 mm - Maximum	0.0010 in - Maximum
Connecting Rod Journal Taper - Production	0.00508 mm - Maximum	0.00030 in - Maximum
Connecting Rod Journal Taper - Service	0.025 mm - Maximum	0.0010 in - Maximum
Connecting Rod Side Clearance	0.15-0.44 mm	0.006-0.017 in
Crankshaft
Crankshaft Bearing Clearance - Journal #1-Production	0.02-0.508 mm	0.0008-0.0020 in
Crankshaft Bearing Clearance - Journal #2, #3, and #4-Production	0.028-0.058 mm	0.0011-0.0023 in
Crankshaft Bearing Clearance - Journal #1-Service	0.0254-0.05 mm	0.0010-0.0020 in
Crankshaft Bearing Clearance - Journal #2, #3, and #4-Service	0.025-0.063 mm	0.0010-0.0250 in
Crankshaft End Play	0.050-0.20 mm	0.002-0.008 in
Crankshaft Journal Diameter - Journal #1	62.199-62.217 mm	2.4488-2.4495 in
Crankshaft Journal Diameter - Journal #2 and #3	62.191-62.215 mm	2.4485-2.4494 in
Crankshaft Journal Diameter - Journal #4	62.179-62.203 mm	2.4480-2.4489 in
Crankshaft Journal Out-of-Round - Production	0.005 mm - Maximum	0.0002 in - Maximum
Crankshaft Journal Out-of-Round - Service	0.025 mm - Maximum	0.0010 in - Maximum
Crankshaft Journal Taper - Production	0.007 mm - Maximum	0.0003 in - Maximum
Crankshaft Runout	0.025 mm - Maximum	0.0010 in - Maximum
Cylinder Bore
Diameter	101.618-101.643 mm	4.0007-4.0017 in
Out-of-Round - Production	0.0127 mm - Maximum	0.00050 in - Maximum
Out-of-Round - Service	0.05 mm - Maximum	0.002 in - Maximum
Taper - Production Relief Side	0.025 mm - Maximum	0.0010 in - Maximum
Taper - Production Thrust Side	0.012 mm - Maximum	0.0005 in - Maximum
Taper - Service	0.025 mm - Maximum	0.0010 in - Maximum
Cylinder Head
Surface Flatness	0.10 mm - Maximum	0.004 in - Maximum
Exhaust Manifold
Surface Flatness - Flange to Flange	0.25 mm - Maximum	0.010 in - Maximum
Surface Flatness - Individual Flange	0.05 mm - Maximum	0.002 in - Maximum
Intake Manifold
Surface Flatness	0.10 mm - Maximum	0.004 in - Maximum
Oil Pan
Oil Pan Alignment at Rear of Engine Block	0.3 mm - Maximum	0.011 in - Maximum
Piston
Piston Bore Clearance - Production	0.018-0.061 mm	0.0007-0.0024 in
Piston Bore Clearance - Service	0.075 mm - Maximum	0.0029 in - Maximum
Piston Pin
Clearance in Piston - Production	0.013-0.023 mm	0.0005-0.0009 in
Clearance in Piston - Service	0.025 mm - Maximum	0.0010 in - Maximum
Diameter	23.545-23.548 mm	0.9270-0.9271 in
Fit in Connecting Rod	0.012-0.048 mm - Interference	0.0005-0.0019 in - Interference
Piston Rings - End Gap Measured in Cylinder Bore
Piston Compression Ring Gap - Production-Top Groove	0.25-0.40 mm	0.010-0.016 in
Piston Compression Ring Gap - Production-2nd Groove	0.38-0.58 mm	0.015-0.023 in
Piston Compression Ring Gap - Service-Top Groove	0.25-0.50 mm	0.010-0.020 in
Piston Compression Ring Gap - Service-2nd Groove	0.38-0.80 mm	0.015-0.031 in
Piston Compression Ring Groove Clearance - Production-Top Groove	0.030-0.070 mm	0.0012-0.0027 in
Piston Compression Ring Groove Clearance - Production-2nd Groove	0.040-0.080 mm	0.0015-0.0031 in
Piston Compression Ring Groove Clearance - Service	0.030-0.085 mm	0.0012-0.0033 in
Piston Oil Ring Gap - Production	0.25-0.76 mm	0.010-0.029 in
Piston Oil Ring Gap - Service	0.005-0.090 mm	0.0002-0.0035 in
Piston Oil Ring Groove Clearance - Production	0.046-0.196 mm	0.0018-0.0077 in
Piston Oil Ring Groove Clearance - Service	0.046-0.200 mm	0.0018-0.0079 in
Valve System
Valve Face Angle	45 degrees
Valve Head Edge Margin	0.79 mm - Minimum	0.031 in - Minimum
Valve Lash	Net Lash-No Adjustment
Valve Lift - Exhaust	10.879 mm	0.4280 in
Valve Lift - Intake	10.527 mm	0.4140 in
Valve Lifter	Hydraulic Roller Type
Valve Rocker Arm	Roller Pivot Type
Valve Rocker Arm Ratio	1.5:1
Valve Seat Angle	46 degrees
Valve Seat Runout	0.05 mm - Maximum	0.002 in - Maximum
Valve Seat Width - Exhaust	1.651-2.489 mm	0.065-0.098 in
Valve Seat Width - Intake	1.016-1.651 mm	0.040-0.065 in
Valve Spring Free Length	51.3 mm	2.02 in
Valve Spring Installed Height - Exhaust	42.92-43.43 mm	1.670-1.700 in
Valve Spring Installed Height - Intake	42.92-43.43 mm	1.670-1.700 in
Valve Spring Pressure - Closed	338-374 N at 43.2 mm	76-84 lb at 1.70 in
Valve Spring Pressure - Open	832-903 N at 32.3 mm	187-203 lb at 1.27 in
Valve Stem Clearance - Exhaust-Production	0.025-0.069 mm	0.0010-0.0027 in
Valve Stem Clearance - Exhaust-Service	0.025-0.094 mm	0.0010-0.0037 in
Valve Stem Clearance - Intake-Production	0.025-0.069 mm	0.0010-0.0027 in
Valve Stem Clearance - Intake-Service	0.025-0.094 mm	0.0010-0.0037 in
Valve Stem Oil Seal Installed Height - Measured from the Top of the Large Diameter Valve Guide Bevel to the Bottom of the Valve Stem Oil Seal	1-2 mm	0.03937-0.07874 in

Engine Mechanical Specifications

TORQUE SPECIFICATIONS

Application		Ft. Lbs (N.m)
Balance Shaft Driven Gear Bolt
First Tightening Pass		15 (20)
Final Tightening Pass		35 Degrees
Camshaft Sprocket Bolt		18 (25)
Crankshaft Balancer Bolt		70 (95)
Crankshaft Pulley Bolt		43 (58)
Crossbar Bolt		74 (100)
Cylinder Head Bolt
First Tightening Pass (1)		22 (30)
Final Tightening Pass (Long Bolt)		75 Degrees
Final Tightening Pass (Medium Bolt)		65 Degrees
Final Tightening Pass (Short Bolt)		55 Degrees
Drive Belt Idler Pulley Bolt		37 (50)
Drive Belt Tensioner Bolt		37 (50)
Engine Coolant Temperature Sensor		15 (20)
Engine Mount Bolt		37 (50)
Engine Mount Bracket Bolt		55 (75)
Engine Mount Side Bracket Bolt		37 (50)
Engine Mount-To-Engine Mount Bracket Bolt		48 (65)
Engine Shield Bolt		15 (20)
Engine Wiring Harness Ground Nut		12 (16)
Exhaust Gas Recirculation Valve Inlet Pipe Bracket Bolt		18 (25)
Exhaust Gas Recirculation Valve Inlet Pipe-To-Exhaust Manifold Fitting		18 (25)
Exhaust Gas Recirculation Valve Inlet Pipe-To-Intake Manifold Fitting		22 (30)
Flywheel Bolt (2)		74 (100)
Fuel Pump/Oil Pressure Sensor		22 (30)
Fuel Pump/Oil Pressure Sensor Fitting		11 (15)
Centerline Of Fitting-To-Centerline Of Crankshaft		50 Degrees
Generator Bracket Stud		15 (20)
Harness Ground Bolt		12 (16)
Heater Outlet Hose Clip Bolt		18 (25)
Hood Hinge Bolt		18 (25)
J-23523-F Bolt		18 (25)
Junction Block Bracket Bolt		18 (25)
Lift Bracket Bolts		11 (15)
Oil Filter		22 (30)
Oil Filter Adapter		41 (55)
Oil Pan Bolt (3)		18 (25)
Oil Pan Drain Plug		18 (25)
Oil Pan Skid Plate Bolt		15 (20)
Oil Pump Bolt		66 (90)
Positive Cable Generator Nut		13 (18)
Power Steering Pump Bracket Bolt/Nut		30 (41)
Power Steering Pump Bracket Stud		15 (20)
Spark Plug (New Cylinder Head)		22 (30)
Spark Plug (Used Cylinder Head)		11 (15)
Torque Converter Bolt		47 (63)
Transmission Bolt		37 (50)
Valve Lifter Pushrod Guide Bolt		12 (16)
Valve Rocker Arm Bolt		22 (30)
INCH Lbs. (N.m)
Accelerator Cable Bracket Nut		106 (12)
Accelerator Control Cable Bracket Nut		80 (9)
Balance Shaft Retainer Bolt		106 (12)
Battery Cable Bracket Bolt		106 (12)
Camshaft Retainer Bolt		106 (12)
Crankshaft Position Sensor Bolt		71 (8)
Crankshaft Rear Oil Seal Housing Bolt/Nut		106 (12)
Engine Front Cover Bolt		106 (12)
Engine Oil Level Sensor		115 (13)
Engine Wiring Harness Bracket Nut		106 (12)
Engine Wiring Harness Clip Bolt		80 (9)
Engine Wiring Harness Rear Bracket Nut		80 (9)
Evaporative Emission Canister Purge Solenoid Valve Stud		89 (10)
Intake Manifold (Lower) (4)
First Tightening Pass		27 (3)
Second Tightening Pass		106 (12)
Final Tightening Pass		134 (15)
Intake Manifold (Upper Stud)		80 (9)
Oil Level Indicator Tube Bolt		106 (12)
Spark Plug Wire Support Bolt		106 (12)
Throttle Body Stud		80 (9)
Transmission Cover Bolt		106 (12)
Transmission Oil Cooler Line Bracket		80 (9)
Valve Rocker Arm Cover Bolt		106 (12)
(1) Tighten bolts/nuts following the sequence shown. see scheme 409 (2) Tighten bolts/nuts following the sequence shown. see scheme 410 (3) Tighten bolts/nuts following the sequence shown. see scheme 411 (4) Tighten bolts/nuts following the sequence shown. see scheme 412