Engine Mechanical Specifications. Buick Century 2003

For 1990-2009 cars only

Makes 🢒 Buick 🢒 2003 🢒 Century 🢒 Engine 🢒 Engine Mechanical - 3.1L 🢒 Engine Mechanical Specifications

Application	Specification
Application	Metric	English
General Data
Engine Type	60° V-6
Displacement	3.1L	191 cu in
RPO	LG8
VIN	J
Bore	89 mm	3.50 in
Stroke	84 mm	3.31 in
Compression Ratio	9.6:1
Firing Order	1-2-3-4-5-6
Spark Plug Gap	1.52 mm	0.60 in
Block
Camshaft Bearing Bore Diameter - ID	47.516-47.541 mm	1.871-1.872 in
Camshaft Bearing Bore Diameter - Front and Rear	51.03-51.08 mm	2.009-2.011 in
Camshaft Bearing Bore Diameter - Middle #2, #3	50.77-50.82 mm	1.999-2.001 in
Crankshaft Main Bearing Bore Diameter	72.1535-72.1695 mm	2.8407-2.8413 in
Crankshaft Main Bearing Bore Out-of-Round	0.008 mm	0.0003 in
Cylinder Bore Diameter - Production	89.016-89.034 mm	3.5046-3.5053 in
Cylinder Bore Diameter - Service	89.016-89.042 mm	3.5046-3.5056 in
Cylinder Bore Out-of-Round - Diametral - Production	0.020 mm	0.0008 in
Cylinder Bore Out-of-Round - Diametral - Service	0.025 mm	0.001 in
Cylinder Bore Taper - Production	0.020 mm	0.0008 in
Cylinder Bore Taper - Service	0.025 mm	0.001 in
Cylinder Head Deck Height	224 mm	8.819 in
Cylinder Head Deck Surface Flatness	0.05 mm per 152 mm	0.002 in per 6 in
Valve Lifter Bore Diameter	21.417-21.455 mm	0.843-0.845 in
Camshaft
Camshaft Bearing Inside Diameter	47.516-47.541 mm	1.871-1.872 in
Camshaft Journal Diameter	47.443-47.468 mm	1.868-1.869 in
Camshaft Journal Out-of-Round	0.003 mm	0.00012 in
Camshaft Journal to Bearing Clearance	0.048-0.098 mm	0.002-0.004 in
Camshaft Lobe Lift - Exhaust	6.9263 mm	0.2727 in
Camshaft Lobe Lift - Intake	6.9263 mm	0.2727 in
Camshaft Runout	0.050 mm	0.002 in
Cooling System
Capacity @ Engine RPM	12.4 liters	13.1 quarts
Thermostat Full Open Temperature	195 degrees
Connecting Rod
Connecting Rod Bearing Clearance	0.18-0.062 mm	0.0007-0.017 in
Connecting Rod Bore Diameter	53.962-53.978 mm	2.124-2.125 in
Connecting Rod Bore Out-of-Round	0.008 mm	0.00031 in
Connecting Rod Length - Center to Center	144.75-144.81 mm	5.69-5.70 in
Connecting Rod Side Clearance	0.25-0.37 mm	0.010-0.015 in
Crankshaft
Connecting Rod Journal Diameter	50.768-50.784 mm	1.9987-1.9994 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	21.92-22.08 mm	8.62-8.69 in
Crankshaft End Play	0.060-0.210 mm	0.0024-0.0083 in
Crankshaft Main Bearing Journal Width - #1	29.5 mm	1.161 in
Crankshaft Main Bearing Journal Width - #2	24.0 mm	0.945 in
Crankshaft Main Bearing Jounal Width - #3	24.04 mm	0.946 in
Crankshaft Main Bearing Journal Width - #4	35.8 mm	1.409 in
Crankshaft Main Bearing Clearance - Except #3	0.019-0.064 mm	0.0008-0.0025 in
Crankshaft Main Bearing Clearance - #3 Thrust Bearing	0.032-0.077 mm	0.0012-0.0030 in
Crankshaft Main Journal Diameter	67.239-67.257 mm	2.6473-2.6483 in
Crankshaft Main Journal Out-of-Round	0.005 mm	0.0002 in
Crankshaft Main Journal Taper	0.005 mm	0.0002 in
Crankshaft Rear Flange Runout	0.04 mm	0.0016 in
Crankshaft Reluctor Ring Runout - Max	0.34 mm	0.0134 in
Crankshaft Runout	0.025 mm	0.0010 in
Cylinder Head
Combustion Chamber Depth - at Measurement Point	2.2 mm	0.087 in
Surface Finish - Maximum	2.8 RA
Surface Flatness - Block Deck	0.08 mm per 152 mm	0.003 in per 6 in
Surface Flatness - Exhaust Manifold Deck	0.1 mm	0.004 in
Surface Flatness - Intake Manifold Deck	0.1 mm	0.004 in
Valve Guide Bore - Exhaust	8.01 mm	0.315 in
Valve Guide Bore - Intake	8.01 mm	0.315 in
Valve Guide Installed Height	16.6 mm	0.654 in
Lubrication System
Oil Capacity - with Filter	4.3 liters	4.5 quarts
Oil Capacity - without Filter	3.8 liters	4.0 quarts
Oil Pressure - @ 1850 RPM	414 kPa	60 psi
Oil Pump
Gear Diameter	38.05-38.10 mm	1.498-1.500 in
Gear Pocket - Depth	30.52-30.58 mm	1.202-1.204 in
Gear Pocket - Diameter	38.176-38.226 mm	1.503-1.505 in
Gears Lash	0.094-0.195 mm	0.0037-0.0077 in
Relief Valve-to-Bore Clearance	0.038-0.089 mm	0.0015-0.0035 in
Piston Ring End Gap
First Compression Ring	0.15-0.36 mm	0.006-0.014 in
Second Compression Ring	0.5-0.71 mm	0.0197-0.0280 in
Oil Control Ring	0.25-1.02 mm	0.009-0.040 in
Piston Ring to Groove Clearance
First Compression Ring	0.04-0.086 mm	0.002-0.0033 in
Second Compression Ring	0.04-0.08 mm	0.002-0.0035 in
Oil Control Ring	0.07-0.095 mm	0.0028-0.0037 in
Piston Ring Thickness
First Compression Ring	1.164-1.190 mm	0.046-0.047 in
Second Compression Ring	1.470-1.490 mm	0.057-0.058 in
Oil Control Ring - Maximum	2.960 mm	0.116 in
Pistons
Piston Diameter - New	88.986-89.024 mm	3.503-3.504 in
Piston Ring Groove Width - Top	1.23-1.25 mm	0.048-0.049 in
Piston Ring Groove Width - Second	1.53-1.55 mm	0.060-0.061 in
Piston Ring Groove Width - Third	3.03-3.05 mm	0.119-0.120 in
Piston to Bore Clearance	-0.008--0.048 mm	-0.0003--0.0018 in
Rocker Arms
Valve Rocker Arm Ratio	1.6:1
Valves
Valve Face Angle	45 degrees
Valve Face Runout	0.050 mm	0.002 in
Valve Seat Angle	46 degrees
Valve Seat Depth - Intake	7.9-8.1 mm	0.311-0.318 in
Valve Seat Depth - Exhaust	8.9-9.1 mm	0.350-0.358 in
Valve Seat Runout	0.037 mm	0.0015 in
Valve Seat Width - Intake	1.55-1.80 mm	0.061-0.071 in
Valve Seat Width - Exhaust	1.70-2.0 mm	0.067-0.079 in
Valve Stem-to-Guide Clearance	0.026-0.068 mm	0.0010-0.0027 in
Valve Stem Diameter - Intake	7.967-7.980 mm	0.3137-0.3142 in
Valve Stem Diameter	7.944-7.965 mm	0.3128-0.3136 in
Valve Lifters/Push Rods
Push Rod Length - Intake	146.0 mm	5.75 in
Push Rod Length - Exhaust	152.5 mm	6.0 in
Valve Lifter Diameter	21.387-21.405 mm	0.8420-0.3136 in
Valve Lifter-to-Bore Clearance	0.012-0.068 mm	0.0005-0.0027 in
Valve Springs
Valve Spring Free Length	48.5 mm	1.89 in
Valve Spring Installed Height	43.2 mm	1.701 in
Valve Spring Load - Closed	320 N @ 43.2 mm	75 lb @ 1.701 in
Valve Spring Load - Open	1036 N @ 32 mm	230 lb @ 1.260 in
Valve Spring Total Number of Coils	6.55