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Home >> Chevrolet >> 2014 >> Impala LS >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical - 2.5L (LKW) - Specifications >> Specifications >> Engine Mechanical Specifications

Engine Mechanical Specifications

Engine Mechanical Specifications

Application Specification
Metric English
General Data
  • Engine Type
 Inline 4 Cylinder
  • Displacement
 2.5 L 152 CID
  • RPO
 LKW
  • Liter (VIN)
 -
  • Bore
 87.992-88.008 mm 3.4642-3.4649 in
  • Stroke
 101 mm 3.976 in
  • Compression Ratio
 11.20
  • Spark Plug Gap
 0.95-1.10 mm 0.037-0.043 in
Block
  • Crankshaft Main Bearing Bore Diameter
 60.862-60.876 mm 2.3961-2.3967 in
  • Cylinder Bore Diameter
 87.992-88.008 mm 3.4642-3.4649 in
  • Cylinder Bore Out-of-Round - Maximum
 0.013 mm 0.0005 in
  • Cylinder Head Deck Surface Flatness - over 25 mm length
 0.025 mm 0.001 in
  • Cylinder Head Deck Surface Flatness - over 150 mm length
 0.050 mm 0.002 in
Engine Block to Bedplate Flatness - overall 0.1 mm 0.0039 in
Engine Block to Bedplate Flatness - straightness 0.050 mm in 100 mm 0.002 in in 3.937 in
Piston Deck Height - Below Deck 1.105-1.675 mm 0.0435-0.0659 in
Camshaft
  • Camshaft End Play
 0.040-0.307 mm 0.0016-0.0121 in
  • Camshaft Journal Diameter - Journal 1
 34.935-34.960 mm 1.3754-1.3764 in
  • Camshaft Journal Diameter - Journal 2 thru 5
 26.935-26.960 mm 1.0604-1.0614 in
  • Camshaft Thrust Width - Camshaft with Phaser installed
 30.025-30.175 mm 1.1821-1.1880 in
  • Camshaft Thrust Width - Cylinder Head
 29.868-29.890 mm 1.1759-1.1768 in
Connecting Rod
  • Connecting Rod Bearing to Crankpin Clearance
 0.025-0.075 mm 0.0010-0.0030 in
  • Connecting Rod Bore Diameter - Bearing End
 52.118-52.134 mm 2.0519-2.05252 in
  • Connecting Rod Bore Diameter - Pin End
 20.007-20.017 mm 0.7877-0.7881 in
  • Connecting Rod Bore Out-of-Round - Bearing End
 0.015 mm 0.0006 in
  • Connecting Rod Side Clearance
 0.090-0.350 mm 0.0035-0.0138 in
  • Connecting Rod Straightness - Bend - Maximum
 0.017 mm 0.0007 in
  • Connecting Rod Straightness - Twist - Maximum
 0.040 mm 0.0016 in
Crankshaft
  • Connecting Rod Journal Diametral Taper - Maximum
 0.015 mm 0.0006 in
  • Connecting Rod Journal Out-of-Round - Maximum
 0.01 mm 0.0004 in
  • Connecting Rod Pin Diameter
 48.989-49.015 mm 1.9287-1.9297 in
  • Crankshaft End Play
 0.040-0.270 mm 0.0016-0.0106 in
  • Crankshaft Main Bearing Clearance
 0.020-0.070 mm 0.0008-0.0028 in
  • Crankshaft Main Journal Diameter
 55.983-56.009 mm 2.2040-2.2051 in
  • Crankshaft Main Journal Diametral Taper - Maximum
 0.015 mm 0.0006 in
  • Crankshaft Main Journal Out-of-Round - Maximum
 0.01 mm 0.0004 in
  • Crankshaft Rear Flange Runout - Maximum
 0.025 mm 0.0010 in
  • Crankshaft Reluctor Ring Runout - 1.0 mm (0.04 in) below tooth diameter - Maximum
 0.50 mm 0.0197 in
  • Crankshaft Thrust Surface - Maximum
 25.57 mm 1.0067 in
  • Crankshaft Thrust Surface Runout - Maximum
 0.04 mm 0.0016 in
Cylinder Head
  • Surface Flatness - Block Deck - in 25 mm
 0.025 mm 0.0001 in
  • Surface Flatness - Block Deck - in 150 mm
 0.050 mm 0.0019 in
  • Surface Flatness - Block Deck - between bolts
 0.030 mm 0.0012 in
  • Surface Flatness - Block Deck - Overall
 0.100 mm 0.0039 in
  • Valve Guide Bore - Exhaust
 6.000-6.020 mm 0.2362-0.2370 in
  • Valve Guide Bore - Intake
 6.000-6.020 mm 0.2362-0.2370 in
  • Valve Lifter Bore Diameter - Stationary Lash Adjusters
 12.008-12.030 mm 0.4728-0.4736 in
  • Valve Seat Angle - Relief Surface
 30 Degrees
  • Valve Seat Angle - Seating Surface
 45 Degrees
  • Valve Seat Angle - Undercut Surface
 60 Degrees
  • Valve Seat Runout - Maximum
 0.080 mm 0.0031 in
Lubrication System
  • Oil Pressure - @700 RPM 100°C
 135-190 kPa 20-28 psi
  • Oil Capacity - AWD
 5.7L 6.0 quarts
  • Oil Capacity - FWD
 4.7L 5.0 quarts
Piston Rings
  • Piston Ring End Gap - Top
 0.15-0.25 mm 0.006-0.010 in
  • Piston Ring End Gap - Second
 0.20-0.45 mm 0.008-0.018 in
  • Piston Ring End Gap - Oil Control
 0.15-0.65 mm 0.006-0.026 in
  • Piston Ring to Groove Clearance - Top
 0.04-0.08 mm 0.0015-0.0031 in
  • Piston Ring to Groove Clearance - Second
 0.030-0.070 mm 0.0012-0.0030 in
  • Piston Ring to Groove Clearance - Oil Control
 0.058-0.207 mm 0.0023-0.0081 in
  • Piston Ring Thickness - Top
 1.170-1.190 mm 0.0461-0.0469 in
  • Piston Ring Thickness - Second
 1.470-1.490 mm 0.0579-0.0587 in
  • Piston Ring Thickness - Oil Control - Maximum
 0.490 mm 0.0193 in
  • Piston Ring Thickness - Oil Control - Spacer
 0.929-1.006 mm 0.0366-0.0396 in
Pistons and Pins
  • Pin - Piston Pin Clearance to Connecting Rod Bore
 0.007-0.020 mm 0.0003-0.0008 in
  • Pin - Piston Pin Clearance to Piston Pin Bore
 0.002-0.010 mm 0.0001-0.0004 in
  • Pin - Piston Pin Diameter
 21.997-22.000 mm 0.8660-0.8661 in
  • Pin - Piston Pin End Play
 0.413-1.269 mm 0.0163-0.0500 in
  • Piston - Piston Diameter - @14.8 mm up
 87.968-87.982 mm 3.4633-3.4638 in
  • Piston - Piston Pin Bore Diameter
 22.002-22.007 mm 0.8662-0.8664 in
  • Piston - Piston Ring Groove Width - Top
 1.23-1.25 mm 0.0484-0.0492 in
  • Piston - Piston Ring Groove Width - Second
 1.52-1.54 mm 0.0598-0.0606 in
  • Piston - Piston Ring Groove Width - Oil Control
 2.01-2.03 mm 0.0791-0.0799 in
  • Piston - Piston to Bore Clearance - w/o polymer
 0.010-0.041 mm 0.0004-0.0016 in
Valve System
  • Valves - Valve Face Angle
 45 Degrees
  • Valves - Valve Face Runout - Maximum
 0.040 mm 0.0016 in
  • Valves - Valve Seat Runout - Maximum
 0.080 mm 0.0031 in
  • Valves - Valve Seat Gauge Ball Height - Exhaust
 10.885-11.115 mm 0.4285-0.4376 in
  • Valves - Valve Seat Gauge Ball Height - Intake
 9.086-9.314 mm 0.3577-0.3667 in
  • Valves - Valve Stem Diameter - Exhaust
 5.945-5.965 0.2341-0.2348 in
  • Valves - Valve Stem Diameter - Intake
 5.955-5.975 mm 0.2344-0.2352 in
  • Valves - Valve Stem Installed Height
 Check and Record
  • Valves - Valve Stem to Guide Clearance - Exhaust
 0.035-0.075 mm 0.0013-0.0030 in
  • Valves - Valve Stem to Guide Clearance - Intake
 0.025-0.065 mm 0.0010-0.0026 in
  • Valve Lash Adjusters - Valve Lash Adjuster Diameter - Stationary Lash Adjuster
 11.986-12.000 mm 0.0005-0.0020 in
  • Valve Lash Adjusters - Valve Lash-Adjuster-to-Bore Clearance - Stationary Lash Adjuster
 0.013-0.051 mm 3.2210-3.2299 in
  • Valve Springs - Valve Spring Installed Height
 35.0 mm 1.3779 in
  • Valve Springs - Valve Spring Load - Closed - @35 mm
 247-273 N 56-61 lb
  • Valve Springs - Valve Spring Load - Open - @24 mm
 598-662 N 134-149 lb
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