Engine Mechanical Specifications. Cadillac CTS

For 1990-2009 cars only

Makes 🢒 Cadillac 🢒 2003 🢒 CTS - RHD 🢒 Engine 🢒 Engine Mechanical - 2.6L and 3.2L 🢒 Engine Mechanical Specifications

Engine Mechanical Specifications LY9

Application	Specification
Application	Metric	English
General
Engine Type	V6
Displacement	2.6L
RPO	LY9
VIN	M
Bore	83.2 mm	3.28 in
Stroke	79.6 mm	3.13 in
Compression Ratio	10.0:1
Engine Compression Test - Minimum	690 kPa	100 psi
Firing Order	1-2-3-4-5-6
Spark Plug Gap	1.35 mm	0.053 in
Block
Crankshaft Main Bearing Bore Diameter	72.000-72.013 mm	2.8347-2.83516 in
Crankshaft Main Bearing Bore Out-of-Round	0.02 mm	0.0008 in
Cylinder Bore Diameter
Coefficient 8	83.173-83.185 mm	3.2745-3.2750 in
Coefficient 99	83.185-83.195 mm	3.2750-3.2753 in
Coefficient 00	83.195-83.205 mm	3.2753-3.2758 in
Coefficient 01	83.205-83.215 mm	3.2758-3.2762 in
Coefficient 02	83.215-83.225 mm	3.2762-3.2766 in
Cylinder Bore Out-of-Round	0.065 mm	0.0026 in
Cylinder Bore Taper	0.0065 mm	0.0003 in
Cylinder Head Deck Height	221 mm	8.700 in
Cylinder Head Deck Surface Flatness	0.025 mm per 100 mm	0.0010 in per 3.917 in
Camshaft
Belt Deflection	10 mm	0.394 in
Camshaft End Play	0.04-0.144 mm	0.0016-0.0057 in
Camshaft Journal Diameter	27.939-27.960 mm	1.1000-1.1008 in
Camshaft Journal Out-of-Round	0.04 mm	0.00158 in
Camshaft Journal to Bore Clearance	0.009 mm	0.00035 in
Camshaft Lobe Lift - Exhaust	9.2 mm	0.3622 in
Camshaft Lobe Lift - Intake	9.2 mm	0.3622 in
Camshaft Runout	0.04 mm	0.00158 in
Cooling System
Thermostat Full Open Temperature	107°C	225°F
Connecting Rod
Connecting Rod Bearing Clearance	0.010-0.061 mm	0.00039-0.00240 in
Connecting Rod Bore Diameter - Bearing End	52.000-52.012 mm	2.0473-2.0477 in
Connecting Rod Bore Diameter - Pin End	20.959-20.971 mm	0.8251-0.8256 in
Connecting Rod Bore Out-of-Round - Bearing End	0.003 mm	0.0001 in
Connecting Rod Length	150.7 mm	5.933 in
Connecting Rod Side Clearance	0.07-0.028 mm	0.0027-0.0110 in
Crankshaft
Connecting Rod Journal Diameter	48.990-48.974 mm	1.929-1.928 in
Connecting Rod Journal Out-of-Round	0.003 mm	0.0001 in
Crankshaft End Play	0.100-0.202 mm	0.0039-0.00795 in
Crankshaft Main Bearing Clearance	0.014-0.043 mm	0.00055-0.00169 in
Crankshaft Main Journal Diameter	67.980-67.746 mm	2.676-2.667 in
Crankshaft Main Journal Out-of-Round	0.03 mm	0.00119 in
Cylinder Head
Cylinder Head Height/Thickness	134 mm	5.28 in
Surface Flatness - Block Deck	0.025 mm per 100 mm	0.0010 in per 3.917 in
Surface Flatness - Head	0.025 mm per 100 mm	0.0010 in per 3.917 in
Surface Flatness - Exhaust Manifold Deck	0.025 mm per 100 mm	0.0010 in per 3.917 in
Surface Flatness - Intake Manifold Deck	0.025 mm per 100 mm	0.0010 in per 3.917 in
Valve Guide Installed Height	13.7-14.0 mm	0.05394-0.05512 in
Exhaust Manifold
Surface Flatness	0.025 mm per 100 mm	0.0010 in per 3.917 in
Flywheel
Pilot Bearing Installed Depth	8.75-9.25 mm	0.3445-0.3641 in
Lubrication System
Oil Capacity - with Filter	4.8L	5 Quarts
Oil Pressure at Idle - Minimum	150 kPa	21.7 psi
Oil Pump
Inner Gear Tip Clearance	0.08 mm	0.00026 in
Lobe Inner Diameter - Maximum	0.10 mm	0.0039 in
Piston Rings
Piston Ring End Gap
First Compression Ring	0.30-0.50 mm	0.0118-0.0196 in
Second Compression Ring	0.30-0.50 mm	0.0118-0.0196 in
Oil Control Ring	0.4-1.4 mm	0.00013-0.0551 in
Piston Ring to Groove Clearance
First Compression Ring	0.02-0.06 mm	0.00079-0.00024 in
Second Compression Ring	0.02-0.06 mm	0.00079-0.00024 in
Oil Control Ring	0.02-0.06 mm	0.00079-0.00024 in
Piston Ring Thickness
First Compression Ring	1.5 mm	0.0590 in
Second Compression Ring	1.5 mm	0.0590 in
Oil Control Ring	3.0 mm	0.1181 in
Pistons and Pins
Piston
Piston Diameter
Coefficient 8	83.140-83.150 mm	3.2732-3.2736 in
Coefficient 99	83.150-83.160 mm	3.2736-3.2740 in
Coefficient 00	83.160-83.170 mm	3.2740-3.2744 in
Coefficient 01	83.170-83.180 mm	3.2744-3.2748 in
Coefficient 02	83.180-83.190 mm	3.2748-3.2752 in
Piston Pin Bore Diameter	21.007-21.012 mm	0.82705-0.82725 in
Piston to Bore Clearance	0.025-0.045 mm	0.0010-0.0018 in
Pin
Piston Pin Clearance to Piston Pin Bore	0.001-0.015 mm	0.00004-0.0006 in
Piston Pin Diameter	20.99-21.00 mm	0.8263-0.8267 in
Valve System
Valves
Valve Face Angle	90 degrees 40' +15'
Valve Face Runout	0.03 mm	0.00118 in
Valve Head Diameter - Exhaust	29 mm	1.14 in
Valve Head Diameter - Intake	32 mm	1.23 in
Valve Installed Height	39.2 mm	1.543 in
Valve Seat Angle	90 degrees -30'
Valve Seat Runout	0.05 mm	0.002 in
Valve Seat Width - Exhaust	1.4-1.8 mm	0.0551-0.0708 in
Valve Seat Width - Intake	1.0-1.4 mm	0.0394-0.0551 in
Valve Stem Diameter - Exhaust	5.949-5.960 mm	0.2341-0.2346 in
Valve Stem Diameter - Intake	5.955-5.970 mm	0.2345-0.2350 in
Valve Stem-to-Guide Clearance - Exhaust	0.040-0.070 mm	0.0016-0.0028 in
Valve Stem-to-Guide Clearance - Intake	0.030-0.060 mm	0.0012-0.0024 in
Valve Springs
Valve Spring Diameter - Inside	20.2 mm	0.795 in
Valve Spring Diameter - Outside	24.0 mm	0.9445 in
Valve Spring Free Length	41.8 mm	1.65 in
Valve Spring Installed Height	34 mm	1.34 in
Valve Spring Load - Closed	270 N·m @ 34 mm	61 lb @ 1.34 in
Valve Spring Load - Open	655 N·m @ 24 mm	147 lb @ 0.945 in
Valve Spring Total Number of Coils	6.1

Engine Mechanical Specifications LA3

Application	Specification
Application	Metric	English
General
Engine Type	V6
Displacement	3.2L
RPO	LA3
VIN	N
Bore	87.5 mm	3.45 in
Stroke	88 mm	3.47 in
Compression Ratio	10.0:1
Engine Compression Test - Minimum	690 kPa	100 psi
Firing Order	1-2-3-4-5-6
Spark Plug Gap	1.35 mm	0.053 in
Block
Crankshaft Main Bearing Bore Diameter	72.000-72.013 mm	2.8347-2.83516 in
Crankshaft Main Bearing Bore Out-of-Round	0.02 mm	0.0008 in
Cylinder Bore Diameter
Coefficient 8	87.475-87.485 mm	3.4439-3.4443 in
Coefficient 99	87.485-87.495 mm	3.4443-3.4447 in
Coefficient 00	87.495-87.505 mm	3.4447-3.4451 in
Coefficient 01	87.505-87.515 mm	3.4451-3.4455 in
Coefficient 02	87.515-87.525 mm	3.4455-3.4459 in
Cylinder Bore Out-of-Round	0.065 mm	0.0026 in
Cylinder Bore Taper	0.0065 mm	0.0003 in
Cylinder Head Deck Height	221 mm	8.700 in
Cylinder Head Deck Surface Flatness	0.025 mm per 100 mm	0.0010 in per 3.917 in
Camshaft
Belt Deflection	10 mm	0.394 in
Camshaft Journal Diameter	27.939-27.960 mm	1.1000-1.1008 in
Camshaft Journal Out-of-Round	0.04 mm	0.00158 in
Camshaft Journal to Bore Clearance	0.009 mm	0.00035 in
Camshaft Lobe Lift - Exhaust	10 mm	0.394 in
Camshaft Lobe Lift - Intake	10 mm	0.394 in
Camshaft Runout	0.04 mm	0.00158 in
Cooling System
Thermostat Full Open Temperature	107°C	225°F
Connecting Rod
Connecting Rod Bearing Clearance	0.021-0.061 mm	0.0008-0.0024 in
Connecting Rod Bore Diameter - Bearing End	57.000-57.012 mm	2.2445-2.2446 in
Connecting Rod Bore Diameter - Pin End	24.000-24.021 mm	0.9445-0.9457 in
Connecting Rod Bore Out-of-Round - Bearing End	0.003 mm	0.0001 in
Connecting Rod Length	148 mm	5.83 in
Connecting Rod Side Clearance	0.07-0.028 mm	0.0027-0.0110 in
Crankshaft
Connecting Rod Journal Diameter	67.980-67.996 mm	2.6764-2.6770 in
Connecting Rod Journal Out-of-Round	0.03 mm	0.0012 in
Crankshaft End Play	0.100-0.202 mm	0.0039-0.00795 in
Crankshaft Main Bearing Clearance	0.014-0.043 mm	0.00055-0.00169 in
Crankshaft Main Journal Diameter	67.980-67.746 mm	2.676-2.667 in
Crankshaft Main Journal Out-of-Round	0.03 mm	0.00119 in
Cylinder Head
Cylinder Head Height/Thickness	134 mm	5.28 in
Surface Flatness - Block Deck	0.025 mm per 100 mm	0.0010 in per 3.917 in
Surface Flatness - Head	0.025 mm per 100 mm	0.0010 in per 3.917 in
Surface Flatness - Exhaust Manifold Deck	0.025 mm per 100 mm	0.0010 in per 3.917 in
Surface Flatness - Intake Manifold Deck	0.025 mm per 100 mm	0.0010 in per 3.917 in
Valve Guide Installed Height	13.7-14.0 mm	0.05394-0.05512 in
Exhaust Manifold
Surface Flatness	0.025 mm per 100 mm	0.0010 in per 3.917 in
Flywheel
Pilot Bearing Installed Depth	8.75-9.25 mm	0.3445-0.3641 in
Lubrication System
Oil Capacity - with Filter	4.8L	5 Quarts
Oil Pressure - Minimum	150 kPa	21.7 psi
Oil Pump
Inner Gear Tip Clearance	0.08 mm	0.00026 in
Lobe Inner Diameter - Maximum	0.10 mm	0.0039 in
Piston Rings
Piston Ring End Gap
First Compression Ring	0.30-0.50 mm	0.0118-0.0196 in
Second Compression Ring	0.30-0.50 mm	0.0118-0.0196 in
Oil Control Ring	0.4-1.4 mm	0.00013-0.0551 in
Piston Ring to Groove Clearance
First Compression Ring	0.02-0.06 mm	0.00079-0.0024 in
Second Compression Ring	0.02-0.04 mm	0.00079-0.0024 in
Oil Control Ring	0.02-0.04 mm	0.00079-0.0024 in
Piston Ring Thickness
First Compression Ring	1.5 mm	0.0590 in
Second Compression Ring	1.5 mm	0.0590 in
Oil Control Ring	3.0 mm	0.1181 in
Pistons and Pins
Piston
Piston Diameter
Coefficient 8	87.440-87.450 mm	3.4425-3.4429 in
Coefficient 99	87.450-87.460 mm	3.4429-3.4433 in
Coefficient 00	87.460-87.470 mm	3.4433-3.4437 in
Coefficient 01	87.470-87.480 mm	3.4437-3.4441 in
Coefficient 02	87.480-87.490 mm	3.4441-3.4445 in
Piston Pin Bore Diameter	21.001-21.005 mm	0.8268-0.8270 in
Piston to Bore Clearance	0.025-0.045 mm	0.0010-0.0018 in
Pin
Piston Pin Clearance to Connecting Rod Bore	0.001-0.015 mm	0.0004-0.0006 in
Piston Pin Diameter	20.990-21.000 mm	0.8264-0.8268 in
Valve System
Valves
Valve Face Angle	90 degrees 40' +15'
Valve Face Runout	0.03 mm	0.00118 in
Valve Head Diameter - Exhaust	29 mm	1.14 in
Valve Head Diameter - Intake	32 mm	1.23 in
Valve Installed Height	39.2 mm	1.543 in
Valve Seat Angle	90 degrees -30'
Valve Seat Runout	0.05 mm	0.002 in
Valve Seat Width - Exhaust	1.4-1.8 mm	0.0551-0.0708 in
Valve Seat Width - Intake	1.0-1.4 mm	0.0394-0.0551 in
Valve Stem Diameter - Exhaust	5.949-5.960 mm	0.2341-0.2346 in
Valve Stem Diameter - Intake	5.955-5.970 mm	0.2345-0.2350 in
Valve Stem-to-Guide Clearance - Exhaust	0.040-0.070 mm	0.0016-0.0028 in
Valve Stem-to-Guide Clearance - Intake	0.030-0.060 mm	0.0012-0.0024 in
Valve Springs
Valve Spring Diameter - Inside	20.2 mm	0.795 in
Valve Spring Diameter - Outside	24.0 mm	0.9445 in
Valve Spring Free Length	41.8 mm	1.65 in
Valve Spring Installed Height	34 mm	1.34 in
Valve Spring Load - Closed	270 N·m @ 34 mm	61 lb @ 1.34 in
Valve Spring Load - Open	655 N·m @ 24 mm	147 lb @ 0.945 in
Valve Spring Total Number of Coils	6.1