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Home >> Buick >> 2017 >> LaCrosse Base >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical - 3.6L (LGX) - Specifications >> Specifications >> Engine Mechanical Specifications

Engine Mechanical Specifications

Application Specification
Metric English
General
  • Engine Type
 V-6
  • Displacement
 3.6 Liter 220 cu in
  • RPO
 LGX
  • VIN
 S
  • Bore
 95 mm 3.7402 in
  • Stroke
 85.6 mm 3.37 in
  • Compression Ratio
 11.5:1
  • Firing Order
 1-2-3-4-5-6
  • Spark Plug Gap
 0.90 mm 0.035 in
Block
  • Crankshaft Main Bearing Bore Diameter
 76.021 - 76.035 mm 2.9929 - 2.9935 in
  • Cylinder Bore Diameter
 94.992 - 95.008 mm 3.7398 - 3.7405 in
  • Cylinder Bore Out-of-Round - Production Max.
 0.026 mm 0.001 in
Camshaft
  • Camshaft Bearing Inside Diameter - Front Number 1
 31.000 - 31.020 mm 1.2205 - 1.2213 in
  • Camshaft Bearing Inside Diameter - Middle and Rear Number 2 - 4
 24.000 - 24.020 mm 0.9449 - 0.9457 in
  • Camshaft End Play
 0.055 - 0.465 mm 0.0022 - 0.0183 in
  • Camshaft Journal Diameter - Front Number 1
 30.936 - 30.960 mm 0.9424 - 0.9433 in
  • Camshaft Journal Diameter - Middle and Rear Number 2 - 4
 23.936 - 23.960 mm 1.0605 - 1.0614 in
  • Camshaft Journal Out-of-Round
 0.006 mm 0.0002 in
  • Camshaft Journal to Bore Clearance
 0.040 - 0.084 mm 0.0016 - 0.0033 in
  • Camshaft Lobe Lift - Exhaust AFM
 40.557 - 40.707 mm 1.5967 - 1.6026 in
  • Camshaft Lobe Lift - Exhaust Non AFM
 42.519 - 42.669 mm 1.6740 - 1.6799 in
  • Camshaft Lobe Lift - Intake AFM
 40.353 - 42.503 mm 1.5887 - 1.5946 in
  • Camshaft Lobe Lift - Intake Non AFM
 42.317 - 42.467 mm 1.6660 - 1.6719 in
  • Camshaft Runout - Front and Rear Number 1 and 4
 0.025 mm 0.0010 in
  • Camshaft Runout - Middle 2 and 3
 0.050 mm 0.0020 in
  • Valve Lift - Exhaust AFM
 11.350 mm 0.4468 in
  • Valve Lift - Exhaust Non AFM
 11.222 mm 0.4418 in
  • Valve Lift - Intake AFM
 11.00 mm 0.4331 in
  • Valve Lift - Intake Non AFM
 10.872 mm 0.4280 in
Connecting Rod
  • Connecting Rod Bearing Clearance
 0.010 - 0.070 mm 0.0004 - 0.0026 in
  • Connecting Rod Bore Diameter - Bearing End
 60.920 - 60.936 mm 2.3984 - 2.3990 in
  • Connecting Rod Bore Diameter - Pin End - Production
 23.007 - 23.017 mm 0.9056 - 0.9062 in
  • Connecting Rod Bore Diameter - Pin End - Service Maximum
 23.021 mm 0.9063 in
  • Connecting Rod Length - Center to Center
 148.8 mm 5.86 in
  • Connecting Rod Side Clearance
 0.095 - 0.355 mm 0.00037 - 0.0140 in
  • Connecting Rod Width - Bearing End
  • Production
 21.775 mm 0.8573 in
  • Service
 21.725 - 21.825 mm 0.8553 - 0.8593 in
  • Connecting Rod Width - Pin End
  • Production
 21.775 mm 0.8573 in
  • Service
 21.725 - 21.825 mm 0.8553 - 0.8593 in
Crankshaft
  • Connecting Rod Journal Diameter
 57.292 - 57.308 mm 2.2556 - 2.2556 in
  • Connecting Rod Journal Out-of-Round
 0.005 mm 0.0002 in
  • Connecting Rod Journal Taper
 0.005 mm 0.0002 in
  • Connecting Rod Journal Width
  • Production
 23.000 mm 0.9055 in
  • Service
 22.920 - 23.080 mm 0.9024 - 0.9417 in
  • Crankshaft End Play
 0.100 - 0.330 mm 0.0039 - 0.0130 in
  • Crankshaft Main Bearing Clearance
 0.028 - 0.063 mm 0.0011 - 0.0025 in
  • Crankshaft Main Journal Diameter
 70.992 - 71.008 mm 2.7950 - 2.7956 in
  • Crankshaft Main Journal Out-of-Round
 0.005 mm 0.0002 in
  • Crankshaft Main Journal Taper
 0.005 mm 0.0002 in
  • Crankshaft Main Journal Thrust Wall
  • Runout
 0.000 - 0.040 mm 0.0000 - 0.0016 in
  • Square
 0.000 - 0.010 mm 0.0000 - 0.0004 in
  • Crankshaft Main Journal Width, #2, 4
  • Production
 25.500 mm 1.0040 in
  • Service
 25.400 - 25.600 mm 1.0000 - 1.0079 in
  • Crankshaft Main Journal Width, #3
  • Production
 25.900 mm 1.0197 in
  • Service
 25.875 - 25.925 mm 1.0187 - 1.0207 in
  • Crankshaft Pilot Bearing Bore Diameter
 20.965 - 20.995 mm 0.8254 - 0.8266 in
  • Crankshaft Rear Flange Runout
 0.025 mm 0.0010 in
  • Crankshaft Reluctor Ring Runout - Maximum
 1.500 mm 0.0591 in
  • Crankshaft Runout
 0.030 mm 0.0012 in
  • Crankshaft Thrust Bearing Clearance
 0.076 - 0.305 mm 0.0030 - 0.0120 in
  • Crankshaft Thrust Surface - Height Diameter
 99.500 mm 3.9173 in
  • Crankshaft Thrust Surface Runout
 0.040 mm 0.0016 in
Cylinder Head
  • Valve Guide Bore - Exhaust
 6.000 - 6.020 mm 0.2362 - 0.2370 in
  • Valve Guide Bore - Intake
 6.000 - 6.020 mm 0.2362 - 0.2370 in
  • Valve Guide Installed Height
 16.050 - 16.550 mm 0.6319 - 0.5516 in
  • Valve Seat Width - Exhaust Seating Surface
 1.550 - 1.950 mm 0.0610 - 0.0768 in
  • Valve Seat Width - Exhaust Relief Surface
 0.780 - 0.980 mm 0.0307 - 0.0386 in
  • Valve Seat Width - Intake Seating Surface
 1.000 - 1.400 mm 0.0394 - 0.0551 in
  • Valve Seat Width - Intake Relief Surface
 0.500 - 0.700 mm 0.0197 - 0.0276 in
  • Valve Lifter Bore Diameter
 12.008 - 12.030 mm 0.4728 - 0.4736 in
Lubrication System
  • Oil Pressure - Minimum @ Idle
 69 kPa 10 psi
  • Oil Pressure - Minimum @ 2,000 RPM
 136 kPa 20 psi
  • Piston Cooling Jet Valve Opening Pressure
 3.15 - 3.85 bar 45.7 - 55.8 psi
Piston Rings
  • Piston Ring End Gap
  • First Compression Ring - Nominal
 0.140 - 0.240 mm 0.0055 - 0.0102 in
  • First Compression Ring - Maximum, Ring in Bore
 0.290 mm 0.0094 in
  • Second Compression Ring - Nominal
 0.300 - 0.450 mm 0.0118 - 0.0177 in
  • Second Compression Ring - Maximum, Ring in Bore
 0.490 mm 0.0193 in
  • Oil Control Ring
 0.150 - 0.350 mm 0.0059 - 0.0138 in
  • Piston Ring to Groove Clearance
  • First Compression Ring
 0.03 - 0.08 mm 0.0011 - 0.0031 in
  • Second Compression Ring
 0.020 - 0.060 mm 0.0007 - 0.0024 in
  • Oil Control Ring
 0.06 - 0.19 mm 0.0024 - 0.0075 in
  • Piston Ring Thickness
  • First Compression Ring
 0.975 - 0.990 mm 0.0384 - 0.0390 in
  • Second Compression Ring
 1.170 - 1.195 mm 0.0461 - 0.0470 in
  • Oil Control Ring
 1.360 - 1.480 mm 0.0535 - 0.0583 in
Pistons and Pins
  • Piston
  • Piston Diameter - Measured Over Skirt Coating
 94.976 - 95.014 mm 3.7392 - 3.7407 in
  • Piston Diameter - Service Limit Minimum w/more than 10K miles
 94.926 mm 3.7372 in
  • Piston Pin Bore Diameter
 23.004 - 23.009 mm 0.9055 - 0.9056 in
  • Piston Ring Groove Width - First Compression Ring
 1.02 - 1.05 mm 0.0402 - 0.0413 in
  • Piston Ring Groove Width - Second Compression Ring
 1.210 - 1.230 mm 0.0476 - 0.0484 in
  • Piston Ring Groove Width - Oil Control Ring
 2.01 - 2.03 mm 0.0791 - 0.0799 in
  • Piston to Bore Clearance - Production; Measured at Skirt Coating
 0.022 - 0.032 mm 0.0009 - 0.0013 in
  • Piston to Bore Clearance - Service Limit Maximum, w/more than 10k miles
 0.050 mm 0.0020 in
  • Pin
  • Piston Pin Clearance to Connecting Rod Bore - Production
 0.007 - 0.020 mm 0.0002 - 0.0007 in
  • Piston Pin Clearance to Connecting Rod Bore - Service Maximum
 0.030 mm 0.0012 in
  • Piston Pin Clearance to Piston Pin Bore - Production
 0.004 - 0.012 mm 0.0002 - 0.0005 in
  • Piston Pin Clearance to Piston Pin Bore - Service Maximum
 0.015 mm 0.0006 in
  • Piston Pin Diameter
 22.997 - 23.000 mm 0.9053 - 0.9055 in
  • Piston Pin Length
 55.7 - 56.0 mm 2.193 - 2.205 in
Valve System
  • Valves
  • Valve Face Angle
 44 degrees (from combustion face)
  • Valve Face Runout
 0.0500 mm 0.0020 in
  • Valve Face Width - Exhaust
 DO NOT GRIND, REPLACE VALVE DO NOT GRIND, REPLACE VALVE
  • Valve Face Width - Intake
 DO NOT GRIND, REPLACE VALVE DO NOT GRIND, REPLACE VALVE
  • Valve Head Diameter - Exhaust
 31.37-31.63 mm 1.2350-1.2453 in
  • Valve Head Diameter - Intake
 39.27-39.53 mm 1.5460-1.5563 in
  • Valve Installed Height
 35.23 - 36.69 mm 1.3870 - 1.4445 in
  • Valve Length - Exhaust
 100.54 mm 3.9583 in
  • Valve Length - Intake
 106.321 mm 4.1858 in
  • Valve Seat Angle - Seating Surface
 45 degrees
  • Valve Seat Angle - Relief Surface
 30 degrees
  • Valve Seat Roundness - Maximum
 0.008 mm 0.0003 in
  • Valve Seat Runout - Maximum
 0.025 mm 0.0010 in
  • Valve Stem Diameter - Exhaust
 5.945 - 5.965 mm 0.2341 - 0.2348 in
  • Valve Stem Diameter - Intake
 5.595 - 5.975 mm 0.2344 - 0.2352 in
  • Valve Stem-to-Guide Clearance - Exhaust
 0.035 - 0.075 mm 0.0014 - 0.0030 in
  • Valve Stem-to-Guide Clearance - Intake
 0.025 - 0.065 mm 0.0009 - 0.0025 in
  • Valve Lifters - Stationary Hydraulic Lash Adjuster (SHLA)
  • Valve Lifter (SHLA) Diameter
 11.989 - 12.000 mm 0.4720 - 0.4724 in
  • Valve Lifter (SHLA)-to-Bore Clearance
 0.008 - 0.041 mm 0.0003 - 0.0016 in
  • Rocker Arms
  • Valve Rocker Arm Ratio
 1.68 to 1
  • Valve Rocker Arm Roller Diameter
 17.750 - 17.800 mm 0.6988 - 0.7008 in
  • Valve Springs
  • Valve Spring Coil Thickness
 3.6 mm 0.1417 in
  • Valve Spring Diameter - Inside Top
 12.200 - 12.700 mm 0.4803 - 0.5000 in
  • Valve Spring Diameter - Inside Bottom
 17.950 - 18.450 mm 0.7067 - 0.7264 in
  • Valve Spring Free Length
 44.34-47.34 mm 1.7457-1.8638 in
  • Valve Spring Installed Height - Closed
 37.50 mm 1.4764 in
  • Valve Spring Installed Height - Open
 26.2 mm 1.0315 in
  • Valve Spring Load - Closed
 247 - 273 N 56 - 61 lb
  • Valve Spring Load - Open
 611 - 669 N 137 - 150 lb
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