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HOMESERVICE MANUALSCHEVROLET2006COBALT SS, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 103 (ENGINE MECHANICAL - 3.8L)SPECIFICATIONSENGINE MECHANICAL SPECIFICATIONS
2006 Chevrolet Cobalt SS, 4D Sedan, Standard

Engine Mechanical Specifications

2006 Chevrolet Cobalt SS, 4D Sedan, StandardSECTION Engine Mechanical Specifications
WARNING: This page is about a different car, the 2005 Buick LaCrosse and 2005 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
Engine Mechanical Specifications

Application Specification
Metric English
General Data
  • Engine Type
 90 degrees V-6
  • Displacement
 3.8L 231 cu in
  • RPO
 L26, L32
  • VIN
 2, 4
  • Bore
 96.52 mm 3.8 in
  • Stroke
 86.36 mm 3.4 in
  • Compression Ratio VIN K - @ 4 Compression Strokes
 9.4:1
  • Compression Ratio VIN 1 - @ 4 Compression Strokes
 8.5:1
  • Firing Order
 1-6-5-4-3-2
  • Spark Plug Gap
 1.52 mm 0.60 in
Balance Shaft
  • Bearing Bore Diameter - Front
 51.973-51.999 mm 2.0462-2.0472 in
  • Bearing Bore Diameter-Rear-In Block
 47.584-47.612 mm 1.8735-1.8745 in
  • Bearing Inside Diameter - Rear
 38.117-38.194 mm 1.5007-1.5037 in
  • Bearing Journal Diameter - Rear
 38.072-38.105 mm 1.4989-1.5002 in
  • Bearing Clearance - Rear
 0.0127-0.1219 mm 0.0005-0.0048 in
  • End Play
 0.0-0.171 mm 0.0-0.0067 in
  • Gear Lash
 0.050-0.125 mm 0.002-0.0049 in
Block
  • Balance Shaft Bearing Bore Diameter - Front
 51.973-51.999 mm 2.0462-2.0472 in
  • Balance Shaft Bearing Inside Diameter - Rear
 38.118-38.194 mm 1.5007-1.5037 in
  • Balance Shaft Bearing Bore Diameter - Rear, In Block
 47.584-47.612 mm 1.8735-1.8745 in
  • Camshaft Bearing Inside Diameter - Front and Rear
 46.970-46.934 mm 1.8428-1.8492 in
  • Camshaft Bearing Inside Diameter - Middle #2, #3
 46.977-46.942 mm 1.8481-1.8495 in
  • Crankshaft Main Bearing Bore Diameter
 68.249-68.270 mm 2.6870-2.6878 in
  • Cylinder Bore Diameter
 98.5 mm 3.8 in
  • Cylinder Bore Out-of-Round - Diametral
 0.0254 mm 0.001 in
  • Cylinder Bore Taper
 0.0254 mm 0.001 in
  • Cylinder Head Deck Height
 216.459 mm 8.522 in
  • Cylinder Head Deck Surface Flatness - Overall
 0.0762 mm 0.003 in
  • Valve Lifter Bore Diameter
 21.424-21.450 mm 0.8435-0.8445 in
Camshaft
  • Camshaft Bearing Inside Diameter - 1 and 4
 46.970-46.934 mm 1.8478-1.8492 in
  • Camshaft Bearing Inside Diameter 2 and 3
 46.977-46.942 mm 1.8481-1.8495 in
  • Camshaft Journal Diameter
 47.655-46.858 mm 1.8462-1.8448 in
  • Camshaft Journal Out-of-Round
 0.00635 mm 0.00025 in
  • Camshaft Journal to Bearing Clearance
 0.041-0.119 mm 0.0016-0.0047 in
  • Camshaft Lobe Duration - Exhaust
 330 Crankshaft degrees
  • Camshaft Lobe Duration - Intake
 320 Crankshaft degrees
  • Camshaft Lobe Lift - Exhaust
 6.56 mm 0.258 in
  • Camshaft Lobe Lift - Intake
 6.56 mm 0.258 in
  • Camshaft Lobe Overlap
 96 Crankshaft degrees
Connecting Rod
  • Connecting Rod Bearing Clearance
 0.0127-0.0660 mm 0.0005-0.0026 in
  • Connecting Rod Bore Diameter
 60.295-60.312 mm 2.37378-2.3745 in
  • Connecting Rod Length - Center to Center - S/C
 143.205-143.307 mm 5.638-5.642 in
  • Connecting Rod Length - Center to Center - Non S/C
 145.796-145.898 mm 5.740-5.744 in
  • Connecting Rod Side Clearance
 0.102-0.508 mm 0.004-0.0200 in
Crankshaft
  • Connecting Rod Journal Diameter
 57.1170-57.1475 mm 2.2487-2.2499 in
  • Connecting Rod Journal Out-of-Round
 0.00508 mm 0.00020 in
  • Connecting Rod Journal Taper
 0.00889 mm 0.00035 in
  • Crankshaft End Play
 0.076-0.276 mm 0.003-0.011 in
  • Crankshaft Main Bearing Clearance - #1
 0.0178-0.0406 mm 0.0007-0.0016 in
  • Crankshaft Main Bearing Clearance - #2, 3 and 4
 0.0229-0.0457 mm 0.0009-0.0018 in
  • Crankshaft Main Journal Diameter
 63.470-63.495 mm 2.4988-2.4998 in
  • Crankshaft Main Journal Out-of-Round
 0.00635 mm 0.00025 in
  • Crankshaft Main Journal Taper
 0.00889 mm 0.00035 in
  • Crankshaft Rear Flange Runout
 0.05 mm 0.002 in
  • Crankshaft Runout - from Main 2 & 3 to 1 & 4
 0.076 mm 0.003 in
Cylinder Head
  • Combustion Chamber Depth - at Measurement Point
 3.9166-5.4356 mm 0.154-0.214 in
  • Cylinder Head Height/Thickness
 103.492-104.178 mm 4.0745-4.1015 in
  • Surface Finish
 0.0032 mm 0.000125 in
  • Surface Flatness - Block Deck
 0.1016 mm 0.004 in
  • Surface Flatness - Exhaust Manifold Deck
 0.1016 mm 0.004 in
  • Surface Flatness - Intake Manifold Deck
 0.1016 mm 0.004 in
  • Valve Guide Bore - Exhaust
 8.001-8.0213 mm 0.3150-0.3158 in
  • Valve Guide Bore - Intake
 8.001-8.0213 mm 0.3150-0.3158 in
Exhaust Manifold
  • Surface Flatness - Maximum
 0.5 mm 0.02 in
Lubrication System
  • Oil Capacity - with Filter
 4.3L 4.5 qts
  • Oil Capacity - without Filter
 3.76L 4 qts
  • Oil Pressure - @ 1850 RPM
 414 kPa 60 psi
Oil Pump
  • Gear Pocket - Depth
 11.71-11.75 mm 0.461-0.4625 in
  • Gear Pocket - Diameter
 89.10-89.20 mm 3.508-3.512 in
  • Inner Gear Tip Clearance
 0.152 mm 0.006 in
  • Relief Valve-to-Bore Clearance
 0.038-0.076 mm 0.0015-0.003 in
Piston Ring End Gap
  • First Compression Ring
 0.25-0.46 mm 0.010-0.018 in
  • Second Compression Ring
 0.58-0.84 mm 0.023-0.033 in
  • Oil Control Ring
 0.254-0.762 mm 0.010-0.030 in
Piston Ring to Groove Clearance
  • First Compression Ring
 0.033-0.079 mm 0.0013-0.0031 in
  • Second Compression Ring
 0.033-0.079 mm 0.0013-0.0031 in
  • Oil Control Ring
 0.023-0.201 mm 0.0009-0.0079 in
Piston Ring Thickness
  • First Compression Ring
 1.176-1.197 mm 0.0463-0.0471 in
  • Second Compression Ring
 1.476-1.497 mm 0.0581-0.0589 in
  • Oil Control Ring
 1.854-2.007 mm 0.073-0.079 in
Pistons and Pins - Piston
  • Piston Diameter - Production - S/C
 96.489-96.528 mm 3.7988-3.8003 in
  • Piston Diameter - Production - Non S/C
 96.482-96.497 mm 3.7985-3.7991 in
  • Piston Diameter - Service Limit - Minimum - S/C
 96.434 mm 3.7966 in
  • Piston Diameter - Service Limit - Minimum - Non S/C
 96.442 mm 3.7969 in
  • Piston Pin Bore Diameter - S/C
 23.0065-23.0105 mm 0.9058-0.9059 in
  • Piston Pin Bore Diameter - Non S/C
 22.0060-22.0110 mm 0.8664-0.8666 in
  • Piston to Bore Clearance - New - VIN K
 0.010-0.051 mm 0.0004-0.0020 in
  • Piston to Bore Clearance - Used - VIN K
 0.050-0.091 mm 0.0020-0.0036 in
  • Piston to Bore Clearance - New - VIN 1
 -0.0207-0.0437 mm -0.0008-0.0018 in
  • Piston to Bore Clearance - Used VIN 1
 0.0193-0.0997 mm 0.0008-0.0039 in
Pistons and Pins - Pin
  • Piston Pin Clearance to Connecting Rod Bore - Clearance - VIN 2
 0.0066-0.0217 mm 0.0003-0.0009 in
  • Piston Pin Clearance to Piston Pin Bore - VIN K
 0.0020-0.0130 mm 0.00008-0.00051 in
  • Piston Pin Diameter - Clearance - VIN 4
 21.9950-22.000 mm 0.8659-0.8661 in
  • Piston Pin Clearance to Connecting Rod Bore - Press Fit - VIN 1
 0.0073-0.0225 mm 0.00029-0.00089 in
  • Piston Pin Clearance to Piston Pin Bore - VIN 1
 0.0065-0.0155 mm 0.00061-0.00026 in
  • Piston Pin Diameter - VIN 1
 22.995-23.000 mm 0.90531-0.90551 in
Valves
  • Valve Face Angle
 46 degrees
  • Valve Face Runout
 0.0508 mm 0.002 in
  • Valve Head Diameter - Intake
 46.37-46.63 mm 1.826-1.836 in
  • Valve Head Diameter - Exhaust
 38.481-38.735 mm 1.515-1.525 in
  • Valve Length
 119.464-119.972 mm 4.7033-4.7233 in
  • Valve Seat Angle
 45 degrees
  • Valve Seat Runout
 0.050 mm 0.002 in
  • Valve Seat Width - Intake
 1.53-2.03 mm 0.060-0.080-in
  • Valve Seat Width - Exhaust
 2.29-2.79 mm 0.090-0.110 in
  • Valve Stem Diameter
 7.948-7.965 mm 0.3129-0.3136 in
  • Valve Stem-to-Guide Clearance - Intake
 0.031-0.071 mm 0.0012-0.0028 in
  • Valve Stem-to-Guide Clearance - Exhaust
 0.036-0.074 mm 0.0014-0.0029 in
Valve Lifters/Push Rods
  • Push Rod Length - Intake, Yellow
 178.13 mm 7.013 in
  • Push Rod Length - Exhaust, Green
 178.13 mm 7.013 in
  • Valve Lifter Diameter
 21.387-21.405 mm 0.842-0.843 in
Valve Rocker Arms
  • Valve Rocker Arm Ratio
 1.66:1
Valve Springs
  • Valve Spring Free Length
 49.78 mm 1.960 in
  • Valve Spring Installed Height
 42.93-44.45 mm 1.690-1.750 in
  • Valve Spring Load - Closed
 334 N @ 43.69 mm 75 lb @ 1.72 in
  • Valve Spring Load - Open
 1014 N @ 32.4 mm 228 lb @ 1.277 in
  • Valve Spring Total Number of Coils
 6.6
RENDER: 1.0x

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  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
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