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Home >> Cadillac >> 2018 >> CTS Base, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 16 (Engine Mechanical - 3.6L (LGX LF3) - Specifications) >> Specifications >> Engine Mechanical Specifications (LF3)

Engine Mechanical Specifications (LF3)

WARNING: This page is about a different variant/trim than selected.
Application Specification
Metric English
General
  • Engine Type
 V-6
  • Displacement
 3.6 Liter 220 cu in
  • RPO
 LF3
  • VIN
 8
  • Bore
 94 mm 3.7008 in
  • Stroke
 85.6 mm 3.37 in
  • Compression Ratio
 10.2:1
  • Firing Order
 1-2-3-4-5-6
  • Spark Plug Gap
 0.90 mm 0.035 in
Block
  • Crankshaft Main Bearing Bore Diameter
 72.867 - 72.881 mm 2.8688 - 2.8693 in
  • Cylinder Bore Diameter
 93.992 - 94.008 mm 3.7005 - 3.7011 in
  • Cylinder Bore Out-of-Round - Production Max.
 0.026 mm 0.001 in
  • Cylinder Bore Taper
 0.020 mm 0.0008 in
Camshaft
  • Camshaft Bearing Inside Diameter - Front Number 1
 35.000 - 35.020 mm 1.3779 - 1.3787 in
  • Camshaft Bearing Inside Diameter - Middle and Rear Number 2 - 4
 27.000 - 27.020 mm 1.0630 - 1.0638 in
  • Camshaft End Play
 0.072 - 0.490 mm 0.0028 - 0.0190 in
  • Camshaft Journal Diameter - Front Number 1
 34.936 - 34.960 mm 1.3754 - 1.3764 in
  • Camshaft Journal Diameter - Middle and Rear Number 2 - 4
 26.936 - 26.960 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
 42.457 - 42.757 mm 1.6715 - 1.6833 in
  • Camshaft Lobe Lift - Intake
 42.385 - 42.685 mm 1.6687 - 1.6805 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
 11.003 mm 0.4332 in
  • Valve Lift - Intake
 10.945 mm 0.4309 in
Connecting Rod
  • Connecting Rod Bearing Clearance
 0.010 - 0.070 mm 0.0004 - 0.0026 in
  • Connecting Rod Bore Diameter - Bearing End
 59.620 - 59.636 mm 2.3472 - 2.3479 in
  • Connecting Rod Bore Diameter - Pin End - Production
 24.009 - 24.019 mm 0.9452 - 0.9456 in
  • Connecting Rod Bore Diameter - Pin End - Service Maximum
 24.021 mm 0.9457 in
  • Connecting Rod Length - Center to Center
 150.9 mm 5.94 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
 55.992 - 56.008 mm 2.2044 - 2.2050 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
 22.000 mm 0.8661 in
  • Service
 21.920 - 22.080 mm 0.8630 - 0.8693 in
  • Crankshaft End Play
 0.100 - 0.330 mm 0.0039 - 0.0130 in
  • Crankshaft Main Bearing Clearance
 0.031 - 0.069 mm 0.0012 - 0.0027 in
  • Crankshaft Main Journal Diameter
 67.992 - 68.008 mm 2.6768 - 2.6775 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
 24.000 mm 0.9449 in
  • Service
 23.900 - 24.100 mm 0.9409 - 0.9488 in
  • Crankshaft Main Journal Width, #3
  • Production
 24.400 mm 0.9606 in
  • Service
 24.360 - 24.440 mm 0.9591 - 0.9622 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
 95.000 mm 3.7401 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
 14.050 - 14.550 mm 0.5531 - 0.5728 in
  • Valve Seat Width - Exhaust Seating Surface
 1.400 - 1.800 mm 0.0551 - 0.0709 in
  • Valve Seat Width - Exhaust Relief Surface
 0.700 - 0.900 mm 0.0276 - 0.0354 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 @ 2000 RPM
 138 kPa 20 psi
  • Piston Cooling Jet Valve Opening Pressure
 2.2 - 3.0 bar 32.3 - 44 psi
Piston Rings
  • Piston Ring End Gap
  • First Compression Ring - Nominal
 0.160 - 0.260 mm 0.0063 - 0.0102 in
  • First Compression Ring - Maximum, Ring in Bore
 0.290 mm 0.0114 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
 1.172 - 1.190 mm 0.0461 - 0.0469 in
  • Second Compression Ring
 0.015 - 0.060 mm 0.0006 - 0.0024 in
  • Oil Control Ring
 1.84 - 2.0 mm 0.0724 - 0.0787 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
 93.976 - 94.014 mm 3.6998 - 3.7013 in
  • Piston Diameter - Service Limit Minimum w/more than 10K miles
 93.926 mm 3.6979 in
  • Piston Pin Bore Diameter
 24.004 - 24.009 mm 0.9450 - 0.9452 in
  • Piston Ring Groove Width - First Compression Ring
 1.23 - 1.25 mm 0.0484 - 0.0492 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
 0.009 - 0.022 mm 0.0004 - 0.0009 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
 23.997 - 24.000 mm 0.9448 - 0.9449 in
  • Piston Pin Length
 52.600 - 53.100 mm 2.0709 - 2.0906 in
Valve System
  • Valves
  • Valve Face Angle
 44.25 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
 30.470 - 30.730 mm 1.1996 - 1.2098 in
  • Valve Head Diameter - Intake
 38.170 - 38.430 mm 1.5028 - 1.5130 in
  • Valve Installed Height
 35.23 - 36.69 mm 1.3870 - 1.4445 in
  • Valve Length - Exhaust
 95.11 mm 3.74 in
  • Valve Length - Intake
 100.630 mm 3.9618 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
 0.080 mm 0.0031 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
 3.250 x 3.900 mm 0.1280 x 0.1535 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
 42.500 - 45.500 mm 1.6732 - 1.7913 in
  • Valve Spring Installed Height - Closed
 35.000 mm 1.3779 in
  • Valve Spring Installed Height - Open
 24.000 mm 0.9449 in
  • Valve Spring Load - Closed
 247 - 273 N 56 - 61 lb
  • Valve Spring Load - Open
 598 - 662 N 134 - 149 lb
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