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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN PASSENGER EXTENDED, 5.0 MREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 908 (ENGINE MECHANICAL - 8.1L - UNIT REPAIR OVERHAUL)SPECIFICATIONSENGINE MECHANICAL SPECIFICATIONS
2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 M

Engine Mechanical Specifications

2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 MSECTION Engine Mechanical Specifications
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2001 GMC Yukon XL, 2001 GMC Sierra, 2001 GMC Cab & Chassis Sierra, 2001 GMC C3500 HD, and 2001 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.
Engine Mechanical Specifications

Application Specification
Metric English
General Data
  • Engine Type
 V-8
  • Displacement
 8.1 L 496 CID
  • RPO
 L18
  • VIN C/K/C3500HD
 G
  • VIN Medium Duty
 E
  • Bore
 107.950 mm 4.250 in
  • Stroke
 111.00 mm 4.370 in
  • Compression Ratio
 9.1:1
  • Firing Order
 1-8-7-2-6-5-4-3
  • Spark Plug Gap
 1.52 mm 0.060 in
Cylinder Head
  • Surface Flatness
 0.050 mm 0.002 in
  • Maximum Cylinder Head Block Deck Resurfacing
 0.3048 mm 0.012 in
Exhaust Manifold
  • Surface Flatness
 0.254 mm 0.010 in
Lubrication System
  • Oil Capacity without Filter Change
 5.7 L 6 Qts
  • Oil Pressure (Minimum)
 34 kPa @ 1,000 RPM 5 psi @ 1,000 RPM
  • Oil Pressure (Minimum)
 69 kPa @ 2,000 RPM 10 psi @ 2,000 RPM
  • Oil Filter System
 Full Flow
  • Oil Pump Type
 Gear Driven
Cylinder Bore
  • Diameter - Production
 107.950-107.968 mm 4.2500-4.2507 in
  • Diameter - Service
 107.940-107.990 mm 4.2496-4.2516 in
  • Out-of-Round Production (Maximum Minus Minimum Bore Diameter)
 0.0180 mm
(max.)		 0.0007 in
(max.)
  • Out-of-Round Service (Maximum Minus Minimum Bore Diameter)
 0.050 mm
(max.)		 0.002 in
(max.)
  • Taper Production
 0.0180 mm
(max.)		 0.0007 in
(max.)
  • Taper Service - Thrust Axis
 0.050 mm
(max.)		 0.002 in
(max.)
  • Taper Service - Pin Axis
 0.050 mm
(max.)		 0.002 in
(max.)
Engine Block (Production Specifications)
  • Main Bearing Bore Diameter
 74.6060-74.6220 mm 2.9372-2.9379 in
  • Lifter Bore Diameter
 21.417-21.443 mm 0.843-0.844 in
  • Deck Height from Crankshaft Bore
 259.875-260.125 mm 10.231-10.241 in
  • Head Deck Surface Flatness (entire face)
 0.100 mm 0.004 in
  • Head Deck Surface Flatness within 150 mm (6 in)
 0.050 mm 0.002 in
Piston
  • Piston Diameter (Coated Piston)
 Not Measurable Not Measurable
  • Clearance Production
 Interference Fit
(coated piston)		 Interference Fit
(coated piston)
Piston Ring Compression
  • Top Groove Clearance
 0.031-0.074 mm 0.0012-0.0029 in
  • Second Groove Clearance
 0.031-0.074 mm 0.0012-0.0029 in
  • Top Ring Production Gap
 0.300-0.450 mm 0.012-0.018 in
  • Top Ring Service Limit Gap
 0.450-0.675 mm 0.018-0.027 in
  • Second Ring Production Gap
 0.450-0.650 mm 0.017-0.025 in
  • Second Ring Service Limit Gap
 0.675-0.975 mm 0.026-0.039 in
Piston Ring Oil Control
  • Ring Groove Clearance
 0.051-0.203 mm 0.002-0.008 in
  • Production Gap
 0.249-0.759 mm 0.0098-0.0299 in
  • Service Limit Gap
 0.373-1.138 mm 0.015-0.045 in
Piston Pin
  • Diameter
 26.416-26.419 mm 1.0400-1.0401 in
  • Fit in Connecting Rod
 0.049-0.020 mm
Interference		 0.00019-0.0007 in
Interference
Crankshaft
  • Crankshaft Main Journal Runout - Production
 0.0380 mm
(max.)		 0.0015 in
(max.)
  • Crankshaft Main Journal Runout - Service
 0.0510 mm
(max.)		 0.0020 in
(max.)
  • Crankshaft Journal Diameter #1, #2, #3, #4, #5
 69.805-69.822 mm 2.7482-2.7489 in
  • Crankshaft Journal Taper Production
 0.0102 mm
(max.)		 0.0004 in
  • Crankshaft Journal Out-of-Round Production
 0.0102 mm
(max.)		 0.0004 in
  • Crankshaft Bearing Clearance #1, #2, #3, #4 Production
 0.022-0.052 mm 0.0008-0.0020 in
  • Crankshaft Bearing Clearance #5 Production
 0.035-0.067 mm 0.0014-0.0026 in
  • Crankshaft Bearing Clearance #1, #2, #3, #4 Service Limit
 0.022-0.089 mm 0.0008-0.0035 in
  • Crankshaft Bearing Clearance #5 Service Limit
 0.035-0.102 mm 0.0014-0.0040 in
  • Crankshaft End Play
 0.127-0.279 mm 0.0050-0.0110 in
  • Crankpin Diameter
 55.854-55.870 mm 2.1990-2.1996 in
  • Crankpin Taper Production
 0.0102 mm
(max.)		 0.0004 in
  • Crankpin Out-of-Round Production
 0.0102 mm
(max.)		 0.0004 in
  • Rod Bearing Clearance Production
 0.021-0.064 mm 0.0008-0.0025 in
  • Rod Bearing Clearance Service Limit
 0.021-0.081 mm 0.0008-0.0032 in
  • Connecting Rod Side Clearance
 0.384-0.686 mm 0.0151-0.0270 in
Camshaft
  • Camshaft Runout - Production
 0.051 mm
(Maximum)		 0.002 in
(Maximum)
  • Camshaft Runout - Service
 0.076 mm 0.003 in
  • Lobe Lift Intake
 6.924-7.026 mm 0.2726-0.2766 in
  • Lobe Lift Exhaust
 6.973-7.075 mm 0.2745-0.2785 in
  • Journal Diameter
 49.4720-49.5220 mm 1.9477-1.9497 in
  • Camshaft Bearing Inside Diameter
 49.5480-49.5730 mm 1.9507-1.9517 in
Valve System
  • Lifter
 Hydraulic, Roller Followers
  • Rocker Arm Ratio
 1.70:1
  • Valve Lash Intake
 Net Lash
  • Valve Lash Exhaust
 Net Lash
  • Face Angle (Intake/Exhaust)
 45 degrees
  • Seat Angle (Intake/Exhaust)
 46 degrees
  • Seat Runout (Intake/Exhaust)
 0.0500 mm
(Maximum)		 0.002 in
(Maximum)
  • Seat Width Intake
 0.800-1.200 mm 0.030-0.060 in
  • Seat Width Exhaust
 1.651-2.159 mm 0.060-0.095 in
  • Stem Clearance Production Intake
 0.025-0.074 mm 0.0010-0.0029 in
  • Stem Clearance Production Exhaust
 0.030-0.079 mm 0.0012-0.0031 in
  • Stem Clearance Service Intake
 0.025-0.088 mm 0.0010-0.0034 in
  • Stem Clearance Service Exhaust
 0.030-0.091 mm 0.0012-0.0036 in
  • Valve Spring Pressure Closed
 381-419 N @ 45.923 mm 86-94 lb @ 1.808 in
  • Valve Spring Pressure Open
 962-1058 N @ 33.985 mm 216-236 lb @ 1.338 in
  • Valve Spring Installed Height
 45.923-46.685 mm 1.808-1.838 in
  • Valve Spring Free Length
 56.35 mm 2.218 in
  • Valve Head Diameter - Intake
 55.63 mm 2.19 in
  • Valve Head Diameter - Exhaust
 43.69 mm 1.72 in
  • Valve Stem Diameter - Intake
 9.436-9.454 mm 0.3715-0.3722 in
  • Valve Stem Diameter - Exhaust
 9.431-9.449 mm 0.3713-0.3720 in
  • Maximum Valve Spring Installed Height Shim (Service Only)
 0.726 mm 0.030 in
  • Maximum Valve Spring Tension Shim (Service Only)
 0.726 mm 0.030 in
  • Maximum Combined Valve Spring Installed Height and Valve Spring Tension Shim (Service Only - Shim Placed Under Valve Rotator Only)
 1.524 mm 0.060 in
RENDER: 1.0x

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  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.