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Engine Mechanical Specifications (LF1)

WARNING: This page is about a different car, the 2010 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
Application Specification
Metric English
General
  • Engine Type
 V-6
  • Displacement
 3.0 Liter 183 cu in
  • RPO
 LF1
  • VIN
 G-cars/Y-trucks
  • Bore
 89 mm 3.5039 in
  • Stroke
 80.3 mm 3.1614 in
  • Compression Ratio
 11.7:1
  • Firing Order
 1-2-3-4-5-6
  • Spark Plug Gap
 1.1 mm 0.0433 in
Block
  • Crankshaft Main Bearing Bore Diameter
 72.867-72.881 mm 2.8688-2.8693 in
  • Cylinder Bore Diameter
 88.992-89.008 mm 3.5036-3.5042 in
  • Cylinder Bore Out-of-Round - Production Max.
 0.013 mm 0.0005 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
 0.045-0.215 mm 0.0018-0.0085 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
 42.456-42.756 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
 10.8 mm 0.4252 in
  • Valve Lift - Intake
 10.8 mm 0.4252 in
Connecting Rod
  • Connecting Rod Bearing Clearance
 0.010-0.070 mm 0.0004-0.0028 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
 24.007 mm 0.9457 in
  • Connecting Rod Length - Center to Center
 156.05 mm 6.1437 in
  • Connecting Rod Side Clearance
 0.095-0.355 mm 0.0037-0.0140 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
 0.010-0.060 mm 0.0004-0.0024 in
  • Crankshaft Main Journal Diameter
 68.000 mm 2.6772 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
 2.000 mm 0.0787 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 Lifter Bore Diameter
 12.008-12.030 mm 0.4728-0.4736 in
Lubrication System
  • Oil Capacity - With or Without Oil Filter Change
 5.7 Liters 6 Quarts
  • Oil Pressure - Minimum @ Idle
 69 kPa 10 psi
  • Oil Pressure - Minimum @ 2,000 RPM
 138 kPa 20 psi
  • Piston Cooling Jet Valve Opening Pressure
 1.7-2.3 bar 25-33 psi
Piston Rings
  • Piston Ring End Gap
  • First Compression Ring - Nominal
 0.150-0.300 mm 0.0059-0.0118 in
  • First Compression Ring - Maximum, Ring in Bore
 0.350 mm 0.1378 in
  • Second Compression Ring - Nominal
 0.280-0.480 mm 0.0110-0.0189 in
  • Second Compression Ring - Maximum, Ring in Bore
 0.450 mm 0.0177 in
  • Oil Control Ring
 0.150-0.600 mm 0.0059-0.0236 in
  • Piston Ring to Groove Clearance
  • First Compression Ring
 0.030-0.065 mm 0.0012-0.0026 in
  • Second Compression Ring
 0.015-0.060 mm 0.0006-0.0024 in
  • Oil Control Ring
 0.030-0.170 mm 0.0012-0.0669 in
  • Piston Ring Thickness
  • First Compression Ring
 1.175-1.190 mm 0.0463-0.0469 in
  • Second Compression Ring
 1.470-1.495 mm 0.0579-0.0589 in
  • Oil Control Ring
 2.360-2.480 mm 0.0929-0.0976 in
Pistons and Pins
  • Piston
  • Piston Diameter - Measured Over Skirt Coating
 88.476-89.014 mm 3.4833-3.5045 in
  • Piston Diameter - Service Limit Minimum, w/more than 10k miles
 88.926 mm 3.5010 in
  • Piston Pin Bore Diameter
 24.007-24.012 mm 0.9452-0.9454 in
  • Piston Ring Groove Width - First Compression Ring
 1.220-1.240 mm 0.0480-0.0488 in
  • Piston Ring Groove Width - Second Compression Ring
 1.510-1.530 mm 0.0595-0.0602 in
  • Piston Ring Groove Width - Oil Control Ring
 2.510-2.530 mm 0.0988-0.0996 in
  • Piston to Bore Clearance - Production; Measured at Skirt Coating
 0.022-0.032 mm 0.0008-0.0013 in
  • Piston to Bore Clearance - Service Limit Maximum, w/more than 10k miles
 0.650 mm 0.0256 in
  • Pin
  • Piston Pin Clearance to Connecting Rod Bore - Production
 0.007-0.024 mm 0.0003-0.0010 in
  • Piston Pin Clearance to Connecting Rod Bore - Service Maximum
 0.030 mm 0.0012 in
  • Piston Pin Clearance to Piston Pin Bore - Production
 0.007-0.015 mm 0.0003-0.0006 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
 60.60-61.10 mm 2.3858-2.4055 in
Valve System
  • Valves
  • Valve Face Angle
 44.25 degrees
  • Valve Face Runout
 0.038 mm 0.0015 in
  • Valve Face Width - Exhaust
 2.750 mm 0.1083 in
  • Valve Face Width - Intake
 2.180 mm 0.0858 in
  • Valve Head Diameter - Exhaust
 30.470-30.730 mm 1.1996-1.2098 in
  • Valve Head Diameter - Intake
 35.03-35.29 mm 1.3791-1.3894 in
  • Valve Installed Height
 35.23-36.69 mm 1.3870-1.4445 in
  • Valve Length - Exhaust
 97.11 mm 3.8232 in
  • Valve Length - Intake
 101.23 mm 3.9854 in
  • Valve Seat Angle - Seating Surface
 45 degrees
  • Valve Seat Angle - Relief Surface
 30 degrees
  • Valve Seat Angle - Undercut Surface
 60 degrees
  • Valve Seat Roundness- Maximum
 0.025 mm 0.0010 in
  • Valve Seat Runout - Maximum
 0.080 mm 0.0032 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 Stem Diameter - Exhaust
 5.945-5.965 mm 0.2341-0.2348 in
  • Valve Stem Diameter - Intake
 5.955-5.975 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 0.0010-0.0026 in
  • Valve Lifters - Stationary Hydraulic Lifter Assembly (SHLA)
  • Valve Lifter (SHLA) Diameter
 11.989-12.000 mm 0.4720-0.4724 in
  • Valve Lifter (SHLA)-to-Bore Clearance
 0.037-0.041 mm 0.0015-0.0016 in
  • Rocker Arms
  • Valve Rocker Arm Ratio
 1.68 to 1
  • Valve Rocker Arm Roller Diameter
 17.740-17.800 mm 0.6987-0.7008 in
  • Valve Springs
  • Valve Spring Coil Thickness
 3.250 x 3.900 mm 0.1280 x 0.1535 in
  • Valve Spring Diameter - Inside Top
 12.090-12.590 mm 0.4760-0.4957 in
  • Valve Spring Diameter - Outside Top
 20.140 mm 0.7929 in
  • Valve Spring Diameter - Inside Bottom
 17.950-18.450 mm 0.7067-0.7264 in
  • Valve Spring Diameter - Outside Bottom
 26.000 mm 1.0236 in
  • Valve Spring Free Length
 42.050-44.850 mm 1.6555-1.7657 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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