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Home >> GMC >> 2021 >> Yukon XL AT4 >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical - 5.3L (L84) Or 6.2L (L87) - Specifications >> Specifications >> Engine Mechanical Specifications (L87)

Engine Mechanical Specifications (L87)

Application Specification
Metric English
General
  • Engine Type
 V8
  • Displacement
 6.2L 376 CID
  • RPO
 L87
  • VIN
 L
  • Bore
 103.25 mm 4.064 in
  • Stroke
 92.0 mm 3.622 in
  • Compression Ratio
 11.5: 1
  • Firing Order
 1 - 8 - 7 - 2 - 6 - 5 - 4 - 3
  • Spark Plug Gap
 0.95 - 1.10 mm 0.037 - 0.043 in
Block
  • Camshaft Bearing Bore 1 and 5 Diameter
 59.58 - 59.63 mm 2.345 - 2.347 in
  • Camshaft Bearing Bore 2 and 4 Diameter
 59.08 - 59.13 mm 2.325 - 2.327 in
  • Camshaft Bearing Bore 3 Diameter
 58.58 - 58.63 mm 2.306 - 2.308 in
  • Crankshaft Main Bearing Bore Diameter
 69.869 - 69.891 mm 2.751 - 2.752 in
  • Crankshaft Main Bearing Bore Out-of-Round
 0.008 mm 0.00031 in
  • Cylinder Bore Diameter
 103.239 - 103.261 mm 4.0645 - 4.0654 in
  • Cylinder Head Deck Height - Measuring from the Centerline of Crankshaft to the Deck Face
 234.575 - 234.825 mm 9.235 - 9.245 in
  • Cylinder Head Deck Surface Flatness - Measured Within a 150.00 mm (5.9 in) Area
 0.05 mm 0.002 in
  • Cylinder Head Deck Surface Flatness - Measuring the Overall Length of the Block Deck
 0.1 mm 0.0039 in
  • Valve Lifter Bore Diameter
 21.417 - 21.443 mm 0.843 - 0.844 in
  • Valve Lifter Follower Bore Diameter
 29.187 - 29.213 mm 1.149 - 1.150 in
Camshaft
  • Camshaft End Play
 0.025 - 0.305 mm 0.001 - 0.012 in
  • Camshaft Journal Diameter
 54.990 - 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 0.0019 - 0.0038 in
  • Camshaft Journal Out-of-Round
 0.006 mm 0.0002 in
  • Camshaft Lobe Lift - Exhaust Non AFM
 7.360 mm 0.290 in
  • Camshaft Lobe Lift - Exhaust AFM
 7.490 mm 0.295 in
  • Camshaft Lobe Lift - Intake Non AFM
 7.760 mm 0.306 in
  • Camshaft Lobe Lift - Intake AFM
 7.890 mm 0.311 in
  • Fuel Pump Lobe Lift
 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
 0.023 - 0.076 mm 0.0009 - 0.0029 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
 0.006 mm 0.00023 in
  • Connecting Rod Bore Out-of-Round - Bearing End - Service
 0.008 mm 0.0003 in
  • Connecting Rod Side Clearance
 0.125 - 0.495 mm 0.004 - 0.019 in
Crankshaft
  • Connecting Rod Journal Diameter - Production
 53.320 - 53.336 mm 2.0992 - 2.0998 in
  • Connecting Rod Journal Diameter - Service
 53.31 mm 2.0996 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 Taper - Maximum for 1/2 of Journal Length - Production
 0.008 mm 0.0003 in
  • Connecting Rod Journal Taper - Maximum for 1/2 of Journal Length - Service
 0.015 mm 0.00059 in
  • Crankshaft End Play
 0.040 - 0.220 mm 0.0015 - 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
 0.01 mm 0.0004 in
  • Crankshaft Main Journal Taper - Production
 0.008 mm 0.0003 in
  • Crankshaft Main Journal Taper - Service
 0.015 mm 0.00059 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 0.002 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 Face
 0.1 mm 0.004 in
  • Surface Flatness - Intake Manifold 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 -.691 in
  • Injector Bore Diameter
 7.65 - 7.87 mm 0.301 - 0.309 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 Pressure - Minimum - Hot
 152 kPa at 1000 engine RPM
207 kPa at 2000 engine RPM
228 kPa at 3000 engine RPM		 22 psig at 1000 engine RPM
30 psig at 2000 engine RPM
33 psig at 3000 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
 0.23 - 0.39 mm 0.009 - 0.0153 in
  • Piston Ring End Gap - First Compression Ring - Measured in Cylinder Bore - Service
 0.23 - 0.45 mm 0.009 - 0.0177 in
  • Piston Ring End Gap - Second Compression Ring - Measured in Cylinder Bore - Production
 0.32 - 0.63 mm 0.0126 - 0.0248 in
  • Piston Ring End Gap - Second Compression Ring - Measured in Cylinder Bore - Service
 0.32 - 0.69 mm 0.0126 - 0.0272 in
  • Piston Ring End Gap - Oil Control Ring - Measured in Cylinder Bore - Production
 0.22 - 0.79 mm 0.0086 - 0.0311 in
  • Piston Ring End Gap - Oil Control Ring - Measured in Cylinder Bore - Service
 0.22 - 0.85 mm 0.0086 - 0.0335 in
  • Piston Ring-to-Groove Clearance - First Compression Ring - Production
 0.040 - 0.083 mm 0.0016 - 0.0033 in
  • Piston Ring-to-Groove Clearance - First Compression Ring - Service
 0.040 - 0.083 mm 0.0016 - 0.0033 in
  • Piston Ring-to-Groove Clearance - Second Compression Ring - Production
 0.040 - 0.083 mm 0.0016 - 0.0033 in
  • Piston Ring-to-Groove Clearance - Second Compression Ring - Service
 0.040 - 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 - 0.01 mm 0.00008 - 0.0004 in
  • Pin - Piston Pin Clearance-to-Piston Pin Bore - Service
 0.002 - 0.015 mm 0.00008 - 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 - 0.02 mm 0.00027 - 0.00078 in
  • Pin - Piston Pin Fit in Connecting Rod Bore - Service
 0.007 - 0.022 mm 0.00027 - 0.00086 in
  • Piston - Piston Diameter - Measured Over Skirt Coating
 103.258 - 103.289 mm 4.0653 - 4.0665 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
 13.250 mm 0.521 in
  • Valve Lift - Exhaust
 13.503 mm 0.531 in
  • Valve Lift - Intake Non AFM
 14.000 mm 0.551 in
  • Valve Lift - Intake
 14.253 mm 0.561
  • Valves - Valve Seat Angle
 45 degrees
  • Valves - Valve Seat Runout
 0.05 mm 0.002 in
  • Valves - Valve Seat Runout
 0.08 mm 0.003 in
  • Valves - Valve Seat Width - Exhaust
 2.52 mm 0.099 in
  • Valves - Valve Seat Width - Intake
 1.98 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
NOTE:

For valve stem to guide clearance - valve guide inner diameter measurements must be recorded at a depth of 7 mm (0.26 in) in the valve guide bore.
  • 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
 51.945 - 52.695 mm 2.045 - 2.074 in
  • Rocker Arms - Valve Rocker Arm Ratio
 1.80: 1
  • Valve Springs - Valve Spring Free Length - Yellow Stripe & Top
 56.2 mm 2.21 in
  • Valve Springs - Valve Spring Installed Height - Yellow Stripe & Top
 47.75 mm 1.88 in
  • Valve Springs - Valve Spring Load - Closed - Yellow Stripe & Top
 400 N at 47.75 mm 90 lb at 1.9 in
  • Valve Springs - Valve Spring Load - Open - Yellow Stripe & Top
 1345 N at 35.05 mm 302 lb at 1.38 in
  • Valve Springs - Valve Spring Free Length - Blue Stripe & Top
 55.4 mm 2.18 in
  • Valve Springs - Valve Spring Installed Height - Blue Stripe & Top
 47.75 mm 1.88 in
  • Valve Springs - Valve Spring Load - Closed - Blue Stripe & Top
 410 N at 47.75 mm 92 lb at 1.9 in
  • Valve Springs - Valve Spring Load - Open - Blue Stripe & Top
 1345 N at 35.05 mm 302 lb at 1.38 in
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