Home ReviewsRefund
Home/Chevrolet/Silverado 2500/Chevrolet Silverado 2500 (2000-2004)/Repair manual/Mechanical/Engine Mechanical - 8.1L (On-Vehicle): Specifications
Contents Wiring diagrams Section: Mechanical All sections

Engine Mechanical - 8.1L (On-Vehicle): Specifications Chevrolet Silverado 2500

Mechanical

TORQUE SPECIFICATIONS

ApplicationFt. Lbs. (N.m)
Accessory Drive Belt Tensioner Bolt37 (50)
A/C Belt Tensioner Bolt37 (50)
Camshaft Sprocket Bolt
First Pass22 (30)
Final Pass22 (30)
Connecting Rod Nut22 (30) + 90°
Crankshaft Balancer Bolt189 (255)
Crankshaft Bearing Cap Inner Bolts
First Pass22 (30)
Final PassTighten Additional 90°
Crankshaft Bearing Cap Outer Bolts
First Pass22 (30)
Final PassTighten Additional 90°
Crankshaft Oil Deflector Nut37 (50)
Crossbar Bolt74 (100)
Cylinder Head Bolt
First Pass22 (30)
Second Pass22 (30)
Third PassTighten Additional 120°
Final Pass
Bolts 1, 2, 3, 6, 8, 9, 10, 11, 14, 16 & 17Tighten Additional 60°
Bolts 15 & 16Tighten Additional 45°
Bolts 4, 5, 12 & 13Tighten Additional 30°
Drive Belt Idler Pulley Bolt37 (50)
EGR Pipe Bolt22 (30)
Engine Coolant Temperature Sensor15 (20)
Engine Coolant Temperature Sensor Bracket Bolt37 (50)
Engine Harness Ground Bolt12 (16)
Engine Mount Bracket Through-Bolt55 (70)
Engine Mount-To-Engine Bolt37 (50)
Engine Mount-To-Engine Mount Bracket Bolt48 (65)
Engine Shield Bolt15 (20)
Engine Wiring Harness Bolt12 (16)
Flywheel Bolt
First Pass59 (80)
Final Pass74 (100)
Flywheel Holding Tool Bolt37 (50)
Heater Hose Bracket Bolt37 (50)
Hood Hinge Bolt18 (25)
Lift Bracket Bolt30 (40)
Oil Filter Fitting49 (66)
Oil Level Indicator Tube Nut13 (18)
Oil Level Sensor15 (20)
Oil Pan Bolt
First Pass89 INCH (10)
Final Pass18 (25)
Oil Pan Drain Plug21 (28)
Oil Pan Skid Plate Bolt15 (20)
Oil Pump Bolt56 (75)
Oil Pump Drive Bolt18 (25)
Power Steering Pump Bracket Bolt/Nut37 (50)
Radiator Mounting Bolt18 (25)
Valve Lifter Guide Retainer Bolt18 (25)
Valve Rocker Arm Nut18 (25)
Valve Rocker Arm Stud37 (50)
INCH Lbs. (N.m)
Air Cleaner Outlet Duct Clamp35 (4)
Battery Cable Channel Bolt80 (9)
Camshaft Position Sensor Bolt106 (12)
Camshaft Retainer Bolt106 (12)
Engine Front Cover Bolt
First Pass53 (6)
Final Pass106 (12)
Engine Harness Bolt44 (5)
Engine Harness Stud89 (10)
Fuel Rail Stud106 (12)
Ignition Coil Harness Bolt106 (12)
Intake Manifold Bolt44 (5)
First Pass44 (5)
Second Pass44 (5)
Third Pass89 (10)
Final Pass106 (12)
Intake Manifold Sight Shield Bolt89 (10)
Intake Manifold Sight Shield Bracket Nut44 (5)
Valve Rocker Arm Cover Bolt
First Pass53 (6)
Final Pass106 (12)

TORQUE SPECIFICATIONS

GENERAL SPECIFICATIONS

ApplicationSpecifications
Engine TypeV8
Regular Production Option (RPO)L18
Displacement496" (8.1L)
Bore4.250" (107.950 mm)
Stroke4.370" (111.00 mm)
Compression Ratio9.1:1
Firing Order1-8-7-2-6-5-4-3

GENERAL SPECIFICATIONS

CYLINDER HEAD SPECIFICATIONS

ApplicationIn. (mm)
Surface Flatness0.002 (0.050)
Maximum Cylinder Head Block Deck Resurfacing0.012 (0.3048)

CYLINDER HEAD

EXHAUST MANIFOLD SPECIFICATIONS

ApplicationIn. (mm)
Surface Flatness0.010 (0.254)

EXHAUST MANIFOLD

CYLINDER BORE SPECIFICATIONS

ApplicationIn. (mm)
Diameter
Production4.2500-4.2507 (107.950-107.968)
Service4.2496-4.2516 (107.940-107-990)
Out-Of-Round
Production (Maximum Minus Minimum Bore Diameter)0.0007 (0.0180)
Service (Maximum Minus Minimum Bore Diameter)0.002 (0.050)
Taper Production0.0007 (0.0180)
Taper Service
Thrust Axis0.002 (0.050)
Pin Axis0.002 (0.050)

CYLINDER BORE

ENGINE BLOCK SPECIFICATIONS

ApplicationIn. (mm)
Main Bearing Bore Diameter2.9372-2.9379 (74.6060-74.6220)
Lift Bore Diameter0.843-0.844 (21.417-21.443)
Deck Height From Crankshaft Bore10.231-10.241 (259.875-260-125)
Head Deck Surface Flatness (Entire Face)0.004 (0.100)
Head Deck Surface Flatness Within 6" (150 mm)0.002 (0.050)

ENGINE BLOCK (PRODUCTION SPECIFICATIONS)

PISTON SPECIFICATIONS

ApplicationSpecifications
Piston Diameter (Coated Piston)Not Measurable
Clearance ProductionInterference Fit (Coated Piston)

PISTON

PISTON RING COMPRESSION SPECIFICATIONS

ApplicationIn. (mm)
Top Groove Clearance0.0012-0.0029 (0.031-0.074)
Second Groove Clearance0.0012-0.0029 (0.031-0.074)
Top Ring Gap
Production0.012-0.018 (0.300-0.450)
Service Limit0.018-0.027 (0.450-0.675)
Second Ring Gap
Production0.017-0.025 (0.450-0.650)
Service Limit0.026-0.039 (0.675-0.975)

PISTON RING COMPRESSION

PISTON RING OIL CONTROL SPECIFICATIONS

ApplicationIn. (mm)
Ring Groove Clearance0.002-0.008 (0.051-0.203)
Production Gap0.0098-0.0299 (0.249-0.759)
Service Limit Gap0.015-0.045 (0.373-1.138)

PISTON RING OIL CONTROL

PISTON PIN SPECIFICATIONS

ApplicationIn. (mm)
Diameter1.0400-1.0401 (26.416-26.419)
Fit In Connecting Rod0.00019-0.0007 (0.049-0.020)

PISTON PIN

CRANKSHAFT SPECIFICATIONS

ApplicationIn. (mm)
Crankshaft Main Journal Runout
Production0.0015 (0.0380)
Service0.0020 (0.0510
Crankshaft Journal Diameter No. 1, 2, 3, 4 & 52.7482-2.7489 (69.805-69.822)
Crankshaft Journal Taper - Production0.0004 (0.0102)
Crankshaft Out-Of-Round - Production0.0004 (0.012)
Crankshaft Bearing Clearance
No. 1, 2, 3 & 4 - Production0.0008-0.0020 (0.022-0.052)
No. 5 - Service Limit0.0014-0.0040 (0.035-0.102)
Crankshaft End Play0.0050-0.0110 (0.127-0.279)
Crank Pin Diameter2.1990-2.1996 (55.854-55.870)
Crank Pin Taper0.0004 (0.0102)
Crank Pin Out-Of-Round0.0004 (0.0102)
Rod Bearing Clearance
Production0.0008-0.0025 (0.021-0.064)
Service Limit0.0008-0.0032 (0.021-0.081)
Connecting Rod Side Clearance0.0151-0.0270 (0.384-0.686)

CRANKSHAFT

CAMSHAFT SPECIFICATIONS

ApplicationIn. (mm)
Camshaft Runout
Production0.002 (0.051)
Service0.003 (0.076)
Lobe Lift
Intake0.2726-0.2766 (6.924-7.026)
Exhaust0.2745-0.2785 (6.973-7.075)
Journal Diameter1.9477-1.9497 (49.4720-49.5220)
Camshaft Bearing I.D.1.9507-1.9517 (49.5480-49.5730)

CAMSHAFT

ENGINE VALVE SYSTEM SPECIFICATIONS

ApplicationSpecification
LifterHydraulic, Roller Followers
Rocker Arm Ratio1.70:1
Valve Lash - Exhaust & IntakeNet Lash
Face Angle (Intake/Exhaust)45 Degrees
Seat Angle (Intake/Exhaust)46 Degrees
Seat Runout (Intake/Exhaust)0.002" (0.0500 mm)
Seat Width
Intake0.030-0.060" (0.800-1.200 mm)
Exhaust0.060-0.095" (1.651-2.159 mm)
Stem Clearance - Production
Intake0.0010-0.0029" (0.025-0.074 mm)
Exhaust0.0012-0.0031" (0.030-0.079 mm)
Stem Clearance - Service
Intake0.0010-0.0034" (0.025-0.088 mm)
Exhaust0.0012-0.0036" (0.030-0.091 mm)
Valve Spring Pressure
Closed86-94 lbs. @ 1.808 (381-419 N @ 33.985)
Open216-236 lbs. @ 1.338 (962-1058 N @ 33.985)
Valve Spring Installed Height1.808-1.838" (45.923-46.685 mm)
Valve Spring Free Length2.218" (56.35 mm)
Valve Head Diameter
Intake2.19" (55.63 mm)
Exhaust1.72" (43.69 mm)
Valve Stem Diameter
Intake0.3715-0.3722" (9.436-9.454 mm)
Exhaust0.3713-0.3720" (9.431-9.449 mm)
Maximum Valve Spring Installed Height Shim (Service Only)0.030" (0.726 mm)
Maximum Valve Spring Tension Shim (Service Only)0.030" (0.726 mm)
Maximum Combined Valve Spring Installed Height & Valve Spring Tension Shim (Service Only - Shim Placed Under Valve Rotator Only)0.060" (1.524 mm)

VALVE SYSTEM

More articles — Engine Mechanical - 8.1L (On-Vehicle)