GM Service Manual Online
For 1990-2009 cars only

Application

Specification

Metric

English

General

  • Engine Type

90 degree V6

  • Displacement

4.3 L

262 CID

  • RPO

LU3

  • VIN

X

  • Bore

101.60 mm

4.012 in

  • Stroke

88.39 mm

3.480 in

  • Compression Ratio

9.2:1

  • Firing Order

1-6-5-4-3-2

  • Spark Plug Gap

1.52 mm

0.060 in

Balance Shaft

  • Bearing Journal Diameter - Rear

38.085-38.100 mm

1.4994-1.500 in

  • Bushing Bore Diameter - Rear

0.050-0.088 mm

0.0020-0.0035 in

Block

  • Crankshaft Main Bearing Bore Out-of-Round

0.050 mm

0.002 in

  • Cylinder Bore Diameter

101.618-101.643 mm

4.0007-4.0017 in

  • Cylinder Bore Out-of-Round - Production

0.017 mm

0.0007 in

  • Cylinder Bore Out-of-Round - Service

0.05 mm

0.002 in

  • Cylinder Bore Taper - Production Relief Side

0.025 mm

0.0010 in

  • Cylinder Bore Taper - Production Thrust Side

0.012 mm

0.0005 in

  • Cylinder Bore Taper - Service

0.025 mm

0.0010 in

  • Cylinder Head Deck Surface Flatness

0.050-0.152 mm

0.002-0.006 in

Camshaft

  • Camshaft End Play

0.0254-0.2286 mm

0.0010-0.0090 in

  • Camshaft Journal Diameter

47.440-47.490 mm

1.8677-1.8696 in

  • Camshaft Journal Out-of-Round

0.008 mm

0.0003 in

  • Camshaft Lobe Lift - Exhaust

7.0953 mm

0.2793 in

  • Camshaft Lobe Lift - Intake

6.8678 mm

0.2704 in

  • Camshaft Runout

0.100 mm

0.0039 in

Connecting Rod

  • Connecting Rod Bearing Clearance - Production

0.038-0.078 mm

0.0015-0.0031 in

  • Connecting Rod Bearing Clearance - Service

0.025-0.063 mm

0.0010-0.0025 in

  • Connecting Rod Side Clearance

0.15-0.44 mm

0.006-0.017 in

Crankshaft

  • Connecting Rod Journal Diameter

57.116-57.148 mm

2.2487-2.2497 in

  • Connecting Rod Journal Out-of-Round - Production

0.008 mm

0.0003 in

  • Connecting Rod Journal Out-of-Round - Service

0.025 mm

0.0010 in

  • Connecting Rod Journal Taper - Production

0.010 mm

0.0004 in

  • Connecting Rod Journal Taper - Service

0.025 mm

0.0010 in

  • Crankshaft End Play

0.050-0.20 mm

0.002-0.008 in

  • Crankshaft Main Bearing Clearance #1 - Production

0.02-0.05 mm

0.0008-0.0020 in

  • Crankshaft Main Bearing Clearance #2, #3, and #4 - Production

0.028-0.058 mm

0.0011-0.0023 in

  • Crankshaft Main Bearing Clearance #1 - Service

0.0254-0.05 mm

0.0010-0.0020 in

  • Crankshaft Main Bearing Clearance #2, #3, and #4 - Service

0.025-0.063 mm

0.0010-0.0025 in

  • Crankshaft Main Journal Diameter #1

62.199-62.217 mm

2.4488-2.4495 in

  • Crankshaft Main Journal Diameter #2 and #3

62.191-62.215 mm

2.4485-2.4494 in

  • Crankshaft Main Journal Diameter #4

62.179-62.203 mm

2.4480-2.4489 in

  • Crankshaft Main Journal Out-of-Round - Production

0.005 mm

0.0002 in

  • Crankshaft Main Journal Out-of-Round - Service

0.025 mm

0.0010 in

  • Crankshaft Main Journal Taper

0.007 mm

0.0003 in

Exhaust Manifold

  • Surface Flatness - Flange to Flange

0.25 mm

0.010 in

  • Surface Flatness - Individual Flange

0.05 mm

0.002 in

Intake Manifold

  • Surface Flatness

0.10 mm

0.004 in

Lubrication System

  • Oil Capacity for C/K, G/H with Filter

4.3 L

4.5 qt

  • Oil Capacity for C/K, G/H without Filter

3.8 L

4 qt

  • Oil Capacity for S/T, M/L with Filter

4.7 L

5 qt

  • Oil Capacity for S/T, M/L without Filter

4.3 L

4.5 qt

  • Oil Pressure - at 1,000 RPM

42 kPa

6 psi

  • Oil Pressure - at 2,000 RPM

125 kPa

18 psi

  • Oil Pressure - at 4,000 RPM

166 kPa

24 psi

Piston Rings

  • Piston Ring End Gap - First Compression Ring - Production

0.25-0.40 mm

0.010-0.016 in

  • Piston Ring End Gap - Second Compression Ring - Production

0.38-0.58 mm

0.015-0.023 in

  • Piston Ring End Gap - Oil Control Ring - Production

0.25-0.76 mm

0.010-0.029 in

  • Piston Ring End Gap - First Compression Ring - Service

0.25-0.50 mm

0.010-0.020 in

  • Piston Ring End Gap - Second Compression Ring - Service

0.38-0.80 mm

0.015-0.031 in

  • Piston Ring End Gap - Oil Control Ring - Service

0.005-0.090 mm

0.0002-0.0035 in

  • Piston Ring to Groove Clearance - First Compression Ring - Production

0.030-0.070 mm

0.0012-0.0027 in

  • Piston Ring to Groove Clearance - Second Compression Ring - Production

0.076-0.280 mm

0.0030-0.0110 in

  • Piston Ring to Groove Clearance - Oil Control Ring - Production

0.046-0.196 mm

0.0018-0.0077 in

  • Piston Ring to Groove Clearance - First Compression Ring - Service

0.030-0.085 mm

0.0012-0.0033 in

  • Piston Ring to Groove Clearance - Second Compression Ring - Service

0.030-0.085 mm

0.0012-0.0033 in

  • Piston Ring to Groove Clearance - Oil Control Ring - Service

0.076-0.200 mm

0.0030-0.0079 in

Pistons and Pins

  • Piston - Piston to Bore Clearance - Production

0.018-0.061 mm

0.0007-0.0024 in

  • Piston - Piston to Bore Clearance - Service

0.075 mm

0.0029 in

  • Pin - Piston Pin Clearance to Connecting Rod Bore - Press Fit

0.012-0.048 mm

0.0005-0.0019 in

  • Pin - Piston Pin Clearance to Piston Pin Bore - Production

0.013-0.023 mm

0.0005-0.0009 in

  • Pin - Piston Pin Clearance to Piston Pin Bore - Service

0.025 mm

0.0010 in

  • Pin - Piston Pin Diameter

23.545-23.548 mm

0.9270-0.9271 in

Valve System

  • Valves - Valve Face Angle

45 degrees

  • Valves - Valve Seat Angle

46 degrees

  • Valves - Valve Seat Runout

0.05 mm

0.002 in

  • Valves - Valve Seat Width - Intake

1.016-1.651 mm

0.040-0.065 in

  • Valves - Valve Seat Width - Exhaust

1.651-2.489 mm

0.065-0.098 in

  • Valves - Valve Stem Oil Seal Installed Height

1-2 mm

0.03937-0.07874 in

  • Valves - Valve Stem-to-Guide Clearance - Intake - Production

0.025-0.069 mm

0.0010-0.0027 in

  • Valves - Valve Stem-to-Guide Clearance - Intake - Service

0.025-0.094 mm

0.0010-0.0037 in

  • Valves - Valve Stem-to-Guide Clearance - Exhaust - Production

0.025-0.069 mm

0.0010-0.0027 in

  • Valves - Valve Stem-to-Guide Clearance - Exhaust - Service

0.025-0.094 mm

0.0010-0.0037 in

  • Rocker Arms - Valve Rocker Arm Ratio

1.5:1

  • Valve Springs - Valve Spring Free Length

51.3 mm

2.02 in

  • Valve Springs - Valve Spring Installed Height - Intake

42.92-43.43 mm

1.670-1.700 in

  • Valve Springs - Valve Spring Installed Height - Exhaust

42.92-43.43 mm

1.670-1.700 in

  • Valve Springs - Valve Spring Load - Closed

338-374 N @ 43.2 mm

76-84 lb @ 1.70 in

  • Valve Springs - Valve Spring Load - Open

832-903 N @ 32.3 mm

187-203 lb @ 1.27 in