Engine Mechanical Specifications. GMC Truck Yukon XL

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2001 🢒 Yukon XL - 4WD 🢒 Engine 🢒 Engine Mechanical - 8.1L 🢒 Engine Mechanical Specifications

Application	Specification
Application	Metric	English
General Data
Engine Type	V-8
Displacement	8.1 L	496 CID
RPO	L18
VIN C/K/G/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

Application	Specification
Application	Metric	English
General Data
Engine Type	V8
Regular Production Option (RPO)	L18
Displacement	8.1 Liter	496 CID
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
Lubrication System
Oil Filter Type	PF454
Oil Type	5W-30
Oil Capacity
With Filter Change	6.1 Liters	6.5 Quarts
Without Filter Change	5.7 Liters	6.0 Quarts
Oil Pressure - Hot
Minimum	34 kPa @ 1,000 RPM	5 psi @ 1,000 RPM
Minimum	69 kPa @ 2,000 RPM	10 psi @ 2,000 RPM