Engine Mechanical Specifications. Chevrolet Impala 2001

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2001 🢒 Impala 🢒 Engine 🢒 Engine Mechanical - 2.5L (LE8) 🢒 Engine Mechanical Specifications

Application	Specification
Application	Metric	English
General
Engine Type	V6
RPO Code	LE8
Displacement	2500 cc	153 CID
Bore	84 mm	3.31 in
Stroke	75.0 mm	2.95 in
Compression Ratio	9.5:1
Firing Order	1-6-5-4-3-2
Spark Plug Type-Denso	SK16PR11 or SK20PR11 or K20PR-U11
Spark Plug Type-NGK	BKR6E11 or IFR5J11 or IFR6J11
Spark Plug Gap	1.0-1.1 mm	0.039-0.043 in
Compression
Compression Pressure at 400 RPM-Standard	1400-1600 kPa	199-227 psi
Compression Pressure-Minimum	1300 kPa	185 psi
Compression Pressure Difference Between Any Two Cylinders-Maximum	100 kPa	14.2 psi
Engine Vacuum
Vacuum at Sea Level at 800 RPM	59.9-80.2 kPa	17.7-23.7 in Hg
Lubrication System
Oil Pressure at 4000 RPM	390-470 kPa	55.5-66.8 psi
Oil Capacity with Filter Change	5.5 L	5.8 qt
Oil Capacity without Filter Change	5.0 L	5.2 qt
Cooling System
Cooling System Capacity	8.0 L	8.5 qt
Temperature at which Thermostat begins to Open	82°C	179°F
Temperature at which Thermostat Fully Open	95°C	203°F
Thermostat Valve Lift	8 mm at 95°C	0.32 in at 203°F
Cooling Fan Belt Deflection at 10 kg (22 lbs) of Force-New Belt	7-9 mm	0.27-0.35 in
Cooling Fan Belt Deflection at 10 kg (22 lbs) of Force-Used Belt	9-11 mm	0.35-0.43 in
Radiator Cap Relief Valve Pressure	108 kPa	15.7 psi
Temperature at which Fan Clutch begins to Engage	50-70°C	122-158°F
Camshaft
Journal Outside Diameter	25.959-25.980 mm	1.0220-1.0228 in
Journal Bore Diameter	26.000-26.033 mm	1.0236-1.0249 in
Journal Oil Clearance-Standard	0.020-0.074 mm	0.0008-0.0029 in
Journal Oil Clearance-Maximum	0.12 mm	0.0047 in
Lobe Height Exhaust-Standard	39.428-39.588 mm	1.5523-1.5586 in
Lobe Height Exhaust-Minimum	39.400 mm	1.5512 in
Lobe Height Intake-Standard	39.445-39.605 mm	1.5530-1.5593 in
Lobe Height Intake-Minimum	39.400 mm	1.5512 in
Runout	0.10 mm	0.0039 in
Connecting Rods and Bearings
Connecting Rod Bearing Clearance-Standard	0.039-0.057 mm	0.001-0.0022 in
Connecting Rod Bearing Clearance-Maximum	0.080 mm	0.0031 in
Connecting Rod Bushing Inside Diameter	21.003-21.011 mm	0.8269-0.8272 in
Connecting Rod Bow-Maximum	0.050 mm	0.0020 in
Connecting Rod Side Clearance-Maximum	0.45 mm	0.0177 in
Connecting Rod Side Clearance-Standard	0.25-0.40 mm	0.0099-0.0157 in
Connecting Rod Twist-Maximum	0.10 mm	0.0039 in
Crankshaft Diameter Out-of-Round and Taper-Maximum	0.01 mm	0.0004 in
Crankshaft Diameter-Standard	49.982-50.000 mm	1.9678-1.9685 in
Crankshaft Diameter - 0.25 mm (0.0098 in) Undersize	49.732-49.750 mm	1.9580-1.9586 in
Crankshaft
Journal Taper	0.01 mm	0.0004 in
Journal Out-of-Round	0.01 mm	0.0004 in
Runout at Center Journal	0.06 mm	0.0023 in
Thrust Bearing Thickness-Standard	2.500 mm	0.0984 in
Thrust Bearing Thickness - 0.125 mm (0.0049 in) Oversize	2.563 mm	0.1009 in
Thrust Play-Standard	0.11-0.31 mm	0.0044-0.0122 in
Thrust Play-Maximum	0.38 mm	0.0149 in
Reground Journal Finished Diameter	64.732-64.750 mm	2.5485-2.5492 in
Cylinder Head
Gasket Surface Distortion	0.05 mm	0.0020 in
Seating Distortion Intake and Exhaust Manifolds	0.10 mm	0.004 in
Cylinder Block
Cylinder Bore-Standard-Stamped 1	84.01-84.02 mm	3.3075-3.3078 in
Cylinder Bore-Standard-Stamped 2	84.00-84.01 mm	3.3071-3.3074 in
Cylinder Bore-Maximum	84.050 mm	3.3090 in
Cylinder Bore-Allowance for Honing	0.02 mm	0.008 in
Gasket Surface Distortion-Maximum	0.06 mm	0.0024 in
Taper and Out-of-Round-Maximum	0.10 mm	0.0039 in
Flywheel
Flywheel Face Runout	0.2 mm	0.0078 in
Main Bearings
Crankshaft Journal Diameter - "1" Stamping	64.994-65.000 mm	2.5588-2.5590 in
Crankshaft Journal Diameter - "2" Stamping	64.988-64.994 mm	2.5586-2.5588 in
Crankshaft Journal Diameter - "3" Stamping	64.982-64.988 mm	2.5583-2.5586 in
Main Bearing Cap Bore Diameter - "A" Stamping	70.000-70.006 mm	2.7559-2.7561 in
Main Bearing Cap Bore Diameter - "B" Stamping	70.006-70.012 mm	2.7561-2.7563 in
Main Bearing Cap Bore Diameter - "C" Stamping	70.012-70.018 mm	2.7563-2.7566 in
Main Bearing Clearance-Standard	0.024-0.044 mm	0.0009-0.0017 in
Main Bearing Clearance-Maximum	0.060 mm	0.0023 in
Main Bearing Thickness--Standard-Black	2.449-2.503 mm	0.0984-0.0985 in
Main Bearing Thickness--Standard-Colorless	2.502-2.506 mm	0.0985-0.0986 in
Main Bearing Thickness--Standard-Yellow	2.505-2.509 mm	0.0986-0.0987 in
Main Bearing Thickness--Standard-Blue	2.508-2.512 mm	0.0987-0.0988 in
Main Bearing Thickness--Standard-Pink	2.508-2.500 mm	0.0983-0.0984 in
Main Bearing Thickness--0.25 mm (0.0098 in) Undersize-Black and Red	2.624-2.628 mm	0.1033-0.1034 in
Main Bearing Thickness--0.25 mm (0.0098 in) Undersize-Red Only	2.627-2.631 mm	0.1034-0.1035 in
Main Bearing Thickness--0.25 mm (0.0098 in) Undersize-Yellow and Red	2.630-2.634 mm	0.1035-0.1036 in
Main Bearing Thickness--0.25 mm (0.0098 in) Undersize-Blue and Red	2.633-2.637 mm	0.1036-0.1037 in
Main Bearing Thickness--0.25 mm (0.0098 in) Undersize-Pink and Red	2.633-2.637 mm	0.1037-0.1038 in
Oil Pump
Housing-to-Oil Pump Gear Set Side Clearance-Maximum	0.11 mm	0.0043 in
Outer Rotor-to-Oil Pump Body Radial Clearance-Maximum	0.15 mm	0.0059 in
Outer Pressure Relief Valve-Relief Pressure	430 kPa	61.6 psi
Outer Pressure Relief Spring Free Length	63.5 mm	2.5 in
Outer Pressure Relief Spring Tension	86 Newtons at 52.0 mm	62.2 lb at 2.05 in
Pistons
Diameter-Standard Marked 1	83.980-83.990 mm	3.3063-3.3067 in
Diameter-Standard Marked 2	83.970-83.980 mm	3.3059-3.3062 in
Diameter - 0.25 mm (0.0098 in) Oversize	84.220-84.240 mm	3.3157-3.165 in
Diameter - 0.50 mm (0.0196 in) Oversize	84.470-84.490 mm	3.3256-3.3264 in
Cylinder Bore Diameter-Maximum	84.050 mm	3.3090 in
Cylinder Bore Taper-Maximum	0.10 mm	0.004 in
Cylinder Bore Out-of-Round-Maximum	0.10 mm	0.004 in
Piston Pin Clearance	0.003-0.014	0.0001-0.0005
Piston Pin Diameter	20.997-21.000 mm	0.8266-0.8268 in
Piston-to-Cylinder Bore Clearance	0.02-0.04 mm	0.0008-0.0015 in
Ring End Gap - Top Ring-Standard	0.20-0.35 mm	0.0079-0.0137 in
Ring End Gap - Top Ring-Maximum	0.07 mm	0.0276 in
Ring End Gap - Lower Ring-Standard	0.35-0.50 mm	0.0138-0.0196 in
Ring End Gap - Lower Ring-Maximum	0.07 mm	0.0276 in
Ring End Gap - Oil Ring-Standard	0.20-0.70 mm	0.0079-0.0275 in
Ring End Gap - Oil Ring-Maximum	1.8 mm	0.0709 in
Ring Groove Clearance - Lower Compression Ring	0.020-0.060 mm	0.0008-0.0023 in
Ring Groove Clearance - Upper Compression Ring	0.030-0.070 mm	0.0012-0.0027 in
Valves
Guide Inside Diameter	6.000-6.012 mm	0.2362-0.2367 in
Valve Margin - Intake-Standard	1.0 mm	0.039 in
Valve Margin - Intake-Minimum	0.6 mm	0.023 in
Valve Margin - Exhaust-Standard	1.2 mm	0.047 in
Valve Margin - Exhaust-Minimum	0.7 mm	0.027 in
Valve Head Radial Runout-Maximum	0.8 mm	0.003 in
Head Angles for Refinishing - Area Above Seat Contact Surface	15 Degrees
Head Angles for Refinishing - Area Below Seat Contact Surface-Exhaust Valve Only	60 Degrees
Head Angles for Refinishing - Seat Contact Surface	45 Degrees
Head Angles for Refinishing - Face Contact Surface	45 Degrees
Seating Contact Width-Seat	1.1-1.3 mm	0.0433-0.0512 in
Seating Contact Width-Face	1.1-1.3 mm	0.0433-0.0512 in
Inner Spring Free Length-Standard	36.08 mm	1.4204 in
Inner Spring Free Length-Minimum	35.00 mm	1.3780 in
Outer Spring Free Length-Standard	40.44 mm	1.5921 in
Outer Spring Free Length-Minimum	39.22 mm	1.5441 in
Inner Spring Preload-Standard	6.9-7.9 kg at 27.5 mm	15.2-17.4 lb at 1.08 in
Inner Spring Preload-Minimum	5.9 kg at 27.5 mm	13.0 lb at 1.08 in
Inner Spring Side Clearance-Maximum	1.6 mm	0.063 in
Outer Spring Preload-Standard	15.4-17.8 kg at 31.7 mm	33.9-39.2 lb at 1.25 in
Outer Spring Preload-Minimum	13.3 kg at 31.7 mm	30.0 lb at 1.25 in
Outer Spring Side Clearance-Maximum	1.8 mm	0.070 in
Stem Outside Diameter - Exhaust Valves	5.940-5.955 mm	0.2339-0.2344 in
Stem Outside Diameter - Intake Valves	5.965-5.980 mm	0.2348-0.2354 in
Stem-to-Guide Clearance - Exhaust Valves-Standard	0.045-0.072 mm	0.0018-0.0028 in
Stem-to-Guide Clearance - Exhaust Valves-Maximum	0.09 mm	0.0035 in
Stem-to-Guide Clearance - Intake Valves-Standard	0.020-0.047 mm	0.0008-0.0018 in
Stem-to-Guide Clearance - Intake Valves-Maximum	0.07 mm	0.0027 in
Valve Guide-Oversize	0.03 mm	0.0012 in
Valve Guide Protrusion	13.5 mm	0.53 in
Lifter - Outside Diameter	30.959-30.975 mm	1.2188-1.2194 in
Lifter - Cylinder Head Bore Diameter	31.000-31.025 mm	1.2205-1.2214 in
Lifter-to-Cylinder Head Oil Clearance-Standard	0.025-0.066 mm	0.0010-0.0025 in
Lifter-to-Cylinder Head Oil Clearance-Maximum	0.015 mm	0.0059 in
Valve Lash	Hydraulic - Non-Adjustable

Standard Main Bearing Selection

Letter on Lower Crankcase	Number on Crankweb
--	1	2	3
A	Black	Colorless	Yellow
B	Colorless	Yellow	Blue
C	Yellow	Blue	Pink

Undersize Main Bearing Selection

Letter on Lower Crankcase	Measured Journal Diameter
--	64.744-64.750 mm (2.5489-2.5492 in)	64.738-64.744 mm (2.5487-2.5489 in)	64.732-64.738 mm (2.5485-2.5487 in)
A	Black and Red	Red Only	Yellow and Red
B	Red Only	Yellow and Red	Blue and Red
C	Yellow and Red	Blue and Red	Pink and Red

Piston Selection

Piston Type	Piston Diameter	Cylinder Bore Diameter	Number on Piston	Cylinder Color Code
Standard	83.970-83.980 mm (3.3059-3.3062 in)	84.00-84.01 mm (3.3071-3.3074 in)	2	Blue
Standard	83.980-83.990 mm (3.3063-3.3066 in)	84.01-84.02 mm (3.3075-3.3078 in)	1	Red
0.25 mm (0.0098 in) Oversize	84.220-84.240 mm (3.3157-3.3165 in)	--	--	--
0.50 mm (0.0196 in) Oversize	84.470-84.490 mm (3.3256-3.3264 in)	--