Engine Mechanical Specifications. Oldsmobile Alero 2001

For 1990-2009 cars only

Makes 🢒 Oldsmobile 🢒 2001 🢒 Alero 🢒 Engine 🢒 Engine Mechanical - 2.4L 🢒 Engine Mechanical Specifications

Application	Specification
Application	Metric	English
General Data
Engine Type	Inline 4 Cylinder
Displacement	2.4 L	146 CID
Regular Production Option (RPO) Code LD9 VIN Code T
Bore	90 mm	3.54 in
Stroke	94 mm	3.70 in
Compression Ratio	9.5 to 1
Firing Order	1-3-4-2
Balance Shafts
Balance Shaft Chain Guide Wear Maximum Groove Depth.	2.5 mm	0.100 in
Bearing Clearance	0.044-0.111 mm	0.0017-0.0044 in
Bearing ID	30.019-30.061 mm	1.1819-1.1835 in
Bearing Thickness	1.500-1.508 mm	0.0590-0.0593 in
Bore Roundness	0.025 mm	0.0009 in
Chain Slack, with 3 lb of Pressure Applied to the Guide	1.0 mm	0.040 in
Endplay	0.185-0.455 mm	0.0073-0.0179 in
Gear Backlash	0.074-0.147 mm	0.0029-0.0057 in
Gear Diameter	61.020-61.070 mm	2.4023-2.4043 in
Housing Bore	33.025-33.050 mm	1.3001-1.1801 in
Housing Flatness Maximum	0.076 mm	0.0030 in
Journal Roundness Maximum	0.005 mm	0.0002 in
Journal Taper (Intentional Towards Counterweight)	0.012 mm	0.00047 in
Shaft Groove Width	3.23-3.40 mm	0.127-0.134 in
Shaft Journal OD	29.950-29.975 mm	1.1791-1.1801 in
Thrust Plate Thickness	2.945-3.045 mm	0.1159-0.1199 in
Camshaft
Camshaft Bearing ID No. 1	40.00-40.040 mm	1.5748-1.5764 in
Camshaft Bearing ID No. 2-5	35.00-35.040 mm	1.3780-1.3795 in
End Play Clearance	0.025-0.225 mm	0.0009-0.0088 in
Exhaust Lobe Lift	8.8 mm	0.346 in
Intake Lobe Lift	9.0 mm	0.354 in
Journal Clearance	0.050-0.110 mm	0.0019-0.0043 in
Journal Diameter No. 1	39.93-39.95 mm	1.5720-1.5728 in
Journal Diameter No. 2-5	34.93-34.95 mm	1.3751-1.3760 in
Lobe Taper	0.046-0.083 mm	0.0018-0.0033 in
Camshaft Housing
Bottom Maximum Within 100.0 mm (3.937 in)	0.025 mm	0.001 in
Cam Carrier Flatness	0.07 mm	0.0028 in
Lifter Bore ID	32.989-33.019 mm	1.298-1.299 in
Lifter OD	32.961-32.973 mm	1.297-1.298 in
Lifter to Bore Clearance	0.016-0.058 mm	0.0006-0.0023 in
Lip Seal Bore ID	49.975-50.025 mm	1.9675-1.9695 in
Lip Seal OD	49.975-50.025 mm	1.9675-1.9695 in
Crankshaft and Connecting Rod
Balancer Hub ID to Crank Snout OD	33.00-33.03 mm	1.2992-1.3004 in
Connecting Rod Bearing Clearance	0.010-0.068 mm	0.00039-0.0026 in
Connecting Rod Clearance to Piston Pin	0.007-0.032 mm	0.00028-0.0013 in
Connecting Rod ID at the Large End	51.167-51.193 mm	2.0144-2.0155 in
Connecting Rod ID at the Small End	22.007-22.027 mm	0.8664-0.8672 in
Connecting Rod Journal Width	23.370-23.750 mm	0.9200-0.9350 in
Connecting Rod Weight, in the Same Engine, All Within	2 g	0.0705 oz
Connecting Rod Width at the Large End	23.170-23.220 mm	0.9122-0.9142 in
Connecting Rod Width at the Small End	23.170-23.220 mm	0.9122-0.9142 in
Crankshaft Bearing Clearance	0.010-0.060 mm	0.00039-0.0023 in
Crankshaft End Play	0.087-0.243 mm	0.0034-0.0095 in
Flange Runout Maximum	0.03 mm	0.00120 in
Flywheel Fit	0.000-0.013 mm loose	0.0000-0.0005 in
ID Balancer	33.00-33.03 mm	1.2992-1.3004 in
ID of Seal Diameter on Crank	81.96-82.04 mm	3.2210-3.2299 in
Main Bearing Inside Diameter	60.019-60.060 mm	2.3629-2.3645 in
Main Bearing Journal Diameter	60.00-60.024 mm	2.3622-2.3631 in
Out of Round	0.005 mm	0.0002 in
Out of Round Maximum	0.005 mm	0.0002 in
Rod Assembly Center to Center Distance	144.95-145.05 mm	5.7067-5.7106 in
Rod Bearing Inside Diameter	48.001-48.043 mm	1.8898-1.8914 in
Rod Bearing Journal Diameter	47.975-48.00 mm	1.8887-1.8897 in
Rod Side Clearance	0.150-0.450 mm	0.0059-0.0177 in
Runout of Crankshaft at the Flywheel Flange Maximum	0.050 mm	0.002 in
Runout of Crankshaft Maximum	0.050 mm	0.002 in
Runout of Seal Surface	0.05 mm max	0.002 in
Straightness, Taper	0.007 mm	0.0003 in
Stroke of Crank	94 mm	3.70 in
Supported on Front and Rear Journals Clearance to the Crankshaft Position Sensor	0.77-1.77 mm	0.0303-0.0697 in
Timing Gear Fit to Crankshaft Snout	33.03-33.06 mm	1.3004-1.3016 in
Width, Main Thrust Bearing Journal No. 3, Including Fillets	27.837-27.913 mm	1.0959-1.0989 in
Cylinder Block
Cylinder Bore Diameter	89.992-9.004 mm	3.5430-3.5435 in
Out Of Round Maximum	0.010 mm	0.0004 in
Runout Rear Face of Block to the Crankshaft. Center Line Maximum	0.07 mm	0.002 in
Taper Maximum. Top to 106 mm (4.173 in) Down	0.008 mm	0.0003 in
Cylinder Head
Cylinder Head Maximum Flatness Variation Over 25.4 mm (1.0 in)	0.254 mm	0.001 in
Cylinder Head Maximum Flatness Variation Over 152.4 mm (6.0 in)	0.508 mm	0.002 in
Cylinder Head Maximum Overall Flatness Variation	0.076 mm	0.003 in
Do Not Resurface if the Overall Measurement is Less Than	0.076 mm	0.003 in
Exhaust	27.000 mm	1.062 in
Exhaust	0.037-0.083 mm	0.00150-0.00320 in
Exhaust Valve Guide ID	5.965-5.991 mm	0.2348-0.2358 in
Intake Valve Guide ID	5.965-5.991 mm	0.2348-0.2358 in
Replace the Head if the Overall Measurement is More Than	0.25 mm	0.010 in
Resurface the Head if the Overall Measurement is More Than	0.076-0.25 mm	0.003-0.010 in
Runout	0.05 mm	0.00196 in
Valve Seat Diameter Intake	34.566 mm	1.361 in
Valve Stem to the Valve Guide Clearance Intake	0.024-0.070 mm	0.000986-0.00275 in
Volume	59.8 cc-61.0 cc	1.5825 oz-1.6501 oz
Lubrication System
Oil Pressure @ 3000 RPM	207 kPa	30 psi min.
Oil Pressure @ 900 RPM	69 kPa	10 psi min.
Oil Pump
Diameter	45.050-45.100 mm	1.773-1.775 in
Gerotor Pocket Depth	15.30-15.35 mm	0.6023-0.6043 in
Inner Gerotor Tip Clearance Maximum	0.1 mm	0.0059 in
Oil Pump Drive to Driven Gear Backlash	0.075-0.140 mm	0.0029-0.0055 in
Outer Gerotor Diameter Clearance	0.050-0.150 mm	0.0019-0.0059 in
Outer Gerotor Thickness	15.225-15.250 mm	0.5994-0.6003 in
Piston
Clearance in the Bore (42 mm from top of piston)
Compression Height	29.95-30.05 mm	1.179-1.183 in
Factory Specification	(-) 0.014-0.022 mm	(-) 0.00055-0.00087 in
Service Specification	0.026-0.078 mm	0.0010-0.0031 in
Piston Diameter at 70°F (21°C) (48 mm from top of piston)
Factory Specification	89.982-90.006 mm	3.5426-3.5435 in
Service Specification	89.926-89.966 mm	3.5404-3.5420 in
Piston Pin Bore ID at 70°F (21°C)	22.002-22.006 mm	0.8662-0.8664 in
Ring Groove Width, Oil	3.04-3.06 mm	0.1197-0.1205 in
Ring Groove Width, Second Compression	1.52-1.54 mm	0.0598-0.0606 in
Ring Groove Width, Top Compression	1.23-1.25 mm	0.048-0.049 in
Weight Less Pin and Rings	350 +/- 5 g	12.346 +/- 0.176 oz
Piston Pin
Diameter	21.995-22.000 mm	0.8659-0.8661 in
End Play on Floating Pin	0.49-1.16 mm	0.019-0.046 in
Pin to Piston Clearance Loose @ 21°C (70°F)	0.002-0.011 mm	0.00008-0.00043 in
Pin to Rod Clearance	0.007-0.032 mm	0.00028-0.0013 in
Weight	111.0 g	3.915 oz
Piston Rings
Compression Ring Gap, Second Ring	0.25-0.40 mm	0.0098-0.0157 in
Compression Ring Gap, Top	0.15-0.30 mm	0.006-0.012 in
Compression Ring Side Clearance In Groove, Second Ring	0.030-0.070 mm	0.0012-0.0028 in
Compression Ring Side Clearance in the Groove, Top Ring	0.040-0.080 mm	0.0016-0.0031 in
Compression Ring Width, Second Ring	1.470-1.490 mm	0.0579-0.0587 in
Compression Ring Width, Top Ring	1.170-1.190 mm	0.0461-0.0469 in
Oil Rail Width	0.385-0.440 mm	0.0151-0.0173 in
Oil Ring Gap	0.25-0.76 mm	0.0098-0.0299 in
Oil Ring Width (Ring Package)	2.827-3.014 mm	0.1113-0.1187 in
Valve Lifter
Clearance in Bore	0.016-0.058 mm	0.0006-0.0023 in
Valve Springs
Load @ 26.98 mm (1.0622 in), Open	544-596 N	122-133 lb
Valve Spring Pressure Load @ 36.5 mm (1.4370), Closed	223-247 N	50-55 lb
Valves
Exhaust Valves, Valve Seat Angle 45.5 degrees
Head Diameter	28.870-29.130 mm	1.1366-1.1469 in
Overall Length	108.67 mm	4.2783 in
Stem Diameter	5.908-5.928 mm	0.2326-0.2334 in
Stem to Guide Clearance	0.037-0.83 mm	0.0014-0.0326 in
Valve Seat Runout	0.03 mm	0.0011 in
Valve Seat Angle in Head	45 degrees
Valve Seat Margin Minimum	0.25 mm	0.0098 in
Valve Seat Width	0.94-1.90 mm	0.0370-0.0748 in
Valve Tip to the Groove Centerline	3.92 mm	0.1543 in
Intake Valves, Valve Seat Angle 46 degrees
Head Diameter	35.50 +/- 0.13 mm	1.3976 +/- 0.0051 in
Overall Length	107.79 mm	4.2437 in
Stem Diameter	5.921-5.941 mm	0.2331-0.2339 in
Stem to Guide Clearance	0.024-0.070 mm	0.0009-0.0027 in
Valve Seat Angle in Head	45 degrees
Valve Seat Margin Minimum	0.25 mm	0.0098 in
Valve Seat Runout	0.03 mm	0.0015 in
Valve Seat Width	0.094-1.90 mm	0.0037-0.0748 in
Valve Tip to Groove Centerline	3.92 mm	0.1543 in
Valve Installed Height, All	25.36-26.12 mm	0.9984-1.0283 in
Valve Tip above Spring Retainer, All	1.102-1.320 mm	0.0433-0.0519 in

Application	Specification
Application	Metric	English
General Data
Engine Type	Inline 4 Cylinder
Displacement	2.4 L	146 CID
Regular Production Option (RPO) Code LD9 VIN Code T
Bore	90 mm	3.54 in
Stroke	94 mm	3.70 in
Compression Ratio	9.5 to 1
Firing Order	1-3-4-2
Do Not Resurface if the Overall Measurement is Less Than	0.076 mm	0.003 in
Resurface the Head if the Overall Measurement is More Than	0.076-0.25 mm	0.003-0.010 in
Lubricating System
Oil Pressure @ 3,000 RPM	207 kPa	30 psi min
Oil Pressure @ 900 RPM	69 kPa	10 psi min