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Home >> Cadillac >> 2009 >> XLR Base >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical - 4.6L (LH2) (1 Of 6) >> Specifications >> Engine Mechanical Specifications

Engine Mechanical Specifications

Application Specification
Metric English
General
  • Engine Type
 V-8
  • Displacement
 4.6 Liter 279 cu in
  • RPO
 LH2
  • VIN
 A
  • Bore
 93 mm 3.661 in
  • Stroke
 84 mm 3.3071 in
  • Compression Ratio
 10.5:1
  • Engine Compression Test
 965-1172 kPa 140-170 psi
  • Firing Order
 1-2-7-3-4-5-6-8
  • Spark Plug Gap
 1.270 mm 0.0500 in
Block
  • Crankshaft Main Bearing Bore Diameter
 72.430-72.442 mm 2.8516-2.8521 in
  • Crankshaft Main Bearing Bore Out-of-Round
 0.010 mm 0.0004 in
  • Crankshaft Main Rear Oil Seal
  • Bore
 115.962-116.038 mm 4.5654-4.5684 in
  • Runout
 0.250 mm 0.0098 in
  • Cylinder Bore Diameter @ 41 mm (1.610 in) Below Deck Face
 92.992-93.008 mm 3.6611-3.6617 in
  • Cylinder Bore Out-of-Round
  • Production
 0.010 mm 0.0004 in
  • Service
 0.100 mm 0.0039 in
  • Cylinder Bore Taper
  • Production
 0.010 mm 0.0004 in
  • Service
 0.100 mm 0.0039 in
  • Cylinder Head Deck Height
 224.55 mm 8.8406 in
  • Cylinder Head Deck Surface Flatness
 0.100 mm 0.0039 in
Camshaft
  • Camshaft End Play
 0.120-0.220 mm 0.0050-0.0087 in
  • Camshaft Journal Diameter
 26.948-26.972 mm 1.0610-1.0619 in
  • Camshaft Journal Out-of-Round
 0.006 mm 0.0002 mm
  • Camshaft Journal to Bore Clearance
  • Production
 0.051-0.076 mm 0.0020-0.0030 in
  • Service
 0.040-0.090 mm 0.0016-0.0035 in
  • Camshaft Lobe Duration @ 0.150 mm (0.006 in) Lift - Exhaust
 246 degrees
  • Camshaft Lobe Duration @ 0.150 mm (0.006 in) Lift - Intake
 251 degrees
  • Camshaft Lobe Lift - Exhaust
 5.94 mm 0.2339 in
  • Camshaft Lobe Lift - Intake
 6.15 mm 0.2421 in
  • Camshaft Lobe Overlap @ 0.150 mm (0.006 in) Lift
 0.0 degrees
  • Camshaft Runout
 0.050 mm 0.0020 in
  • Camshaft Thrust Surface
  • Runout
 0.037 mm 0.0015 in
  • Width
 22.990-23.090 mm 0.9051-0.9091 in
  • Camshaft Timing @ 0.150 mm (0.006 in) Lift
  • Intake Opens
 11.0 degrees ATDC
  • Intake Centerline
 133.0 degrees ATDC
  • Intake Closes
 255.7 degrees ATDC
  • Exhaust Opens
 243.2 degrees BTDC
  • Exhaust Centerline
 107.0 degrees BTDC
  • Exhaust Closes
 11.3 degrees ATDC
Camshaft Position Actuator
  • Exhaust Authority
 50 crankshaft degrees/25 camshaft degrees
  • Intake Authority
 40 crankshaft degrees/20 camshaft degrees
Cooling System
  • Thermostat Full Open Temperature
 85°C 185°F
Connecting Rod
  • Connecting Rod Bearing Clearance
  • Production and Service
 0.0250-0.0760 mm 0.0010-0.0030 in
  • Connecting Rod Bore Diameter - Bearing End
 57.136-57.152 mm 2.2495-2.2501 in
  • Connecting Rod Bore Diameter - Pin End
 23.002-23.014 mm 0.9056-0.9061 in
  • Connecting Rod Bore Out-of-Round - Bearing End
 0.006 mm 0.0002 in
  • Connecting Rod Bore Out-of-Round - Pin End
 0.005 mm 0.0002 in
  • Connecting Rod Length Center to Center
 151.00 mm 5.9449 in
  • Connecting Rod Side Clearance
 0.200-0.500 mm 0.0079-0.0197 in
  • Connecting Rod Straightness
 0.050 mm 0.0020 in
Crankshaft
  • Connecting Rod Journal Diameter
 53.947-53.963 mm 2.1239-2.1245 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
 43.840-43.960 mm 1.7260-1.7307 in
  • Crankshaft Balancer
  • Surface Diameter
 50.730-50.870 mm 1.9972-2.0028 in
  • Hub Inside Diameter
 34.847-34.864 mm 1.3719-1.3726 in
  • Crankshaft End Play
 0.050-0.500 mm 0.0020-0.0197 in
  • Crankshaft Main Bearing Clearance
  • Production
 0.0150-0.0550 mm 0.0006-0.0022 in
  • Service
 0.0150-0.0635 mm 0.0006-0.0025 in
  • Crankshaft Main Journal Diameter
 64.350-64.366 mm 2.5335-2.5341 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
 0.040 mm 0.0016 in
  • Crankshaft Main Journal Thrust Wall Square
 0.010 mm 0.0004 in
  • Crankshaft Main Journal Width, #1, #2, #4, #5
 24.540-24.660 mm 0.9661-0.9709 in
  • Crankshaft Main Journal Width, Thrust #3
 25.150-25.250 mm 0.9902-0.9941 in
  • Crankshaft Nose Diameter
  • From Front Face 0.00-21.00 mm (0.0000-0.8268 in)
 34.500-34.750 mm 1.3583-1.3681 in
  • From Front Face 21.00-53.00 mm (0.8268-2.0866 in)
 34.892-34.912 mm 1.3737-1.3745 in
  • From Front Face 53.00 to Rolled Fillet (2.0866-Rolled Fillet)
 33.450-33.550 mm 1.3169-1.3209 in
  • From Front Face 89.94-110.54 mm (3.5409-4.3520 in)
 44.950-45.000 mm 1.7697-1.7717 in
  • Crankshaft Nose Runout
  • From Front Face 0.00-21.00 mm (0.0000-0.8268 in)
 0.100 mm 0.0039 in
  • From Front Face 21.00-53.00 mm (0.8268-2.8066 in)
 0.030 mm 0.0012 in
  • From Front Face 53.00 to Rolled Fillet (2.0866-Rolled Fillet)
 0.100 mm 0.0039 in
  • From Front Face 89.94-110.54 mm (3.5409-4.3520 in)
 0.025 mm 0.0010 in
  • Crankshaft Rear Flange
  • Diameter
 95.880-95.980 mm 3.7748-3.7787 in
  • Runout
 0.025 mm 0.0010 in
  • Crankshaft Rear Flange Face to Engine Flywheel Runout
 0.025 mm 0.0010 in
  • Crankshaft Runout
  • Main Journals #1, #5
 0.022 mm 0.0009 in
  • Main Journals #2, #4, #6
 0.025 mm 0.0010 in
Cylinder Head
  • Camshaft Bearing Bore Diameter
 27.013-27.033 mm 1.0635-1.0642 in
  • Camshaft Bearing Bore Out-of-Round
 0.010 mm 0.0004 in
  • Combustion Chamber Depth - at Measurement Point
 10.470-10.710 mm 0.4122-0.4217 in
  • Cylinder Head Height - Deck to Camshaft Centerline Bore
 136.00 mm 5.3543 in
  • Surface Flatness - Block Deck
 0.050 mm 0.0020 in
  • Surface Flatness - Exhaust Manifold Deck
 0.220 mm 0.0087 in
  • Surface Flatness - Intake Manifold Deck
 0.220 mm 0.0087 in
  • Valve Guide Bore - Exhaust
 5.969-5.989 mm 0.2350-0.2359 in
  • Valve Guide Bore - Intake
 5.969-5.989 mm 0.2350-0.2359 in
  • Valve Guide Installed Height - Exhaust
 14.300 mm 0.5630 in
  • Valve Guide Installed Height - Intake
 14.720 mm 0.5795 in
  • Valve Lifter Bore Diameter
 12.013-12.037 mm 0.4730-0.4739 in
Flywheel
  • Runout
 0.300 mm 0.0118 in
Intake Manifold
  • Surface Flatness
 0.500 mm 0.0200 in
Lubrication System
  • Oil Capacity - with New Dry Oil Filter
 7.6 Liters 8.0 Quarts
  • Oil Capacity - without Oil Filter Change
 7.1 Liters 7.5 Quarts
  • Oil Pressure - Minimum @ Idle
 35 kPa 5 psi
  • Oil Pressure - Minimum @ 2,000 RPM
 250 kPa 35 psi
Piston Rings
  • Piston Ring End Gap
  • First Compression Ring
 0.250-0.400 mm 0.0098-0.0157 in
  • Second Compression Ring
 0.350-0.050 mm 0.0138-0.0020 in
  • Oil Control Ring
 0.250-0.760 mm 0.0098-0.0299 in
  • Piston Ring to Groove Clearance
  • First Compression Ring
 0.040-0.095 mm 0.0016-0.0037 in
  • Second Compression Ring
 0.040-0.095 mm 0.0016-0.0037 in
  • Oil Control Ring
 None - Side Sealing
  • Piston Ring Thickness
  • First Compression Ring
 1.199-1.203 mm 0.0472-0.0474 in
  • Second Compression Ring
 1.499-1.504 mm 0.0590-0.0592 in
  • Oil Control Ring
 2.530-2.555 mm 0.0996-0.1006 in
Pistons and Pins
  • Piston
  • Piston Diameter @ 42 mm (1.6353 in) Below Crown
 92.957-92.972 mm 3.6597-3.6603 in
  • Piston Pin Bore Diameter
 23.002-23.007 mm 0.9056-0.9058 in
  • Piston Ring Groove Inside Diameter
  • First Compression Ring
 84.750-85.000 mm 3.3366-3.3464 in
  • Second Compression Ring
 83.400-83.650 mm 3.2835-3.2933 in
  • Oil Control Ring
 85.670-85.920 mm 3.3728-3.3827 in
  • Piston Ring Groove Width
  • First Compression Ring
 1.230-1.255 mm 0.0484-0.0494 in
  • Second Compression Ring
 1.530-1.555 mm 0.0602-0.0612 in
  • Oil Control Ring
 2.530-2.555 mm 0.0996-0.1006 in
  • Piston to Bore Clearance
 0.020-0.051 mm 0.0008-0.0020 in
  • Pin
  • Piston Pin Clearance to Connecting Rod Bore
 0.002-0.014 mm 0.0001-0.0006 in
  • Piston Pin Clearance to Piston Pin Bore
 0.002-0.012 mm 0.0001-0.0005 in
  • Piston Pin Diameter
 22.995-23.000 mm 0.9053-0.9055 in
  • Piston Pin End Play
  • Piston Pin Length
 61.500-62.000 mm 2.4213-2.4409 in
Valve System
  • Valves
  • Valve Face Angle
 45 degrees
  • Valve Face Runout
 0.038 mm 0.0015 in
  • Valve Face Width
  • Exhaust
 1.500 mm 0.0591 in
  • Intake
 1.000 mm 0.0394 in
  • Valve Head Diameter
  • Exhaust
 28.880-29.140 mm 1.1370-1.1472 in
  • Intake
 36.090-36.350 mm 1.4209-1.4311 in
  • Valve Length
  • Exhaust
 91.730-91.990 mm 3.6114-3.6217 in
  • Intake
 110.600-110.860 mm 4.3543-4.3646 in
  • Valve Seat Angle
 45.75 degrees
  • Valve Seat Relief Angle
 20 degrees
  • Valve Seat Relief Width
  • Exhaust
 0.160-0.360 mm 0.0063-0.0142 in
  • Intake
 0.110-0.310 mm 0.0043-0.0118 in
  • Valve Seat Runout
 0.050 mm 0.0020 in
  • Valve Seat Undercut Angle
  • Exhaust
 65 degrees
  • Intake
 60 degrees
  • Valve Seat Width
  • Exhaust
 1.300-1.700 mm 0.0512-0.0669 in
  • Intake
 0.420-0.820 mm 0.0165-0.0323 in
  • Valve Stem Diameter
 5.920-5.940 mm 0.2331-0.2339 in
  • Valve Stem Out-of-Round
 0.008 mm 0.0003 in
  • Valve Stem Straightness
 0.013 mm 0.0005 in
  • Valve Stem-to-Guide Clearance
  • Exhaust
  • Production
 0.050-0.100 mm 0.0020-0.0039 in
  • Service
 0.050-0.120 mm 0.0020-0.0047 in
  • Intake
  • Production
 0.028-0.068 mm 0.0011-0.0027 in
  • Service
 0.028-0.110 mm 0.0011-0.0043 in
  • Valve Lifters
  • Valve Lifter Diameter
 11.986-12.000 mm 0.4719-0.4724 in
  • Valve Lifter-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 0.6984-0.7008 in
  • Valve Springs
  • Valve Spring Coil Thickness
 4.110 x 3.280 mm 0.1618 x 0.1291 in
  • Valve Spring Diameter
  • Inside
 17.750-18.250 mm 0.6988-0.7185 in
  • Outside
 26.23 mm 1.0327 in
  • Valve Spring Free Length
 40.790-43.690 mm 1.6059-1.7201 in
  • Valve Spring Height
  • Closed
 35.000 mm 1.3780 in
  • Open
 24.500 mm 0.9646 in
  • Valve Spring Load
  • Closed
 211.4-233.4 mm 47.5-52.4 lb
  • Open
 579.0-631.0 mm 130.2-141.9 lb
  • Valve Spring Total Number of Coils
 6.90-7.10
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