GM Service Manual Online
For 1990-2009 cars only

Application

Specification

Metric

English

General Data

  • Engine Type

V6

  • RPO Code

L35/LU3

  • VIN Code

W/X

  • Displacement

4.3 L

262 CID

  • 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

  • Oil Pressure - Minimum - at Normal Operating Temperature

42 kPa at 1,000 RPM

125 kPa at 2,000 RPM

166 kPa at 4,000 RPM

6 psig at 1,000 RPM

18 psig at 2,000 RPM

24 psig at 4,000 RPM

Balance Shaft

  • Rear Bearing Journal Clearance

0.050-0.088 mm

0.0020-0.0035 in

  • Rear Bearing Journal Diameter

38.085-38.100 mm

1.4994-1.500 in

Camshaft

  • End Play

0.0254-0.2286 mm

0.0010-0.0090 in

  • Journal Diameter

47.440-47.490 mm

1.8677-1.8696 in

  • Journal Diameter Out-of-Round

0.025 mm - Maximum

0.0010 in - Maximum

  • Lobe Lift - Exhaust

7.20-7.30 mm

0.283-0.287 in

  • Lobe Lift - Intake

6.97-7.07 mm

0.274-0.278 in

  • Runout

0.065 mm

0.0026 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 Journal Diameter

57.116-57.148 mm

2.2487-2.2497 in

  • Connecting Rod Journal Out-of-Round - Production

0.007 mm - Maximum

0.0002 in - Maximum

  • Connecting Rod Journal Out-of-Round - Service

0.025 mm - Maximum

0.0010 in - Maximum

  • Connecting Rod Journal Taper - Production

0.00508 mm - Maximum

0.00030 in - Maximum

  • Connecting Rod Journal Taper - Service

0.025 mm - Maximum

0.0010 in - Maximum

  • Connecting Rod Side Clearance

0.15-0.44 mm

0.006-0.017 in

Crankshaft

  • Crankshaft Bearing Clearance - Journal #1-Production

0.02-0.508 mm

0.0008-0.0020 in

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

0.028-0.058 mm

0.0011-0.0023 in

  • Crankshaft Bearing Clearance - Journal #1-Service

0.0254-0.05 mm

0.0010-0.0020 in

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

0.025-0.063 mm

0.0010-0.0250 in

  • Crankshaft End Play

0.050-0.20 mm

0.002-0.008 in

  • Crankshaft Journal Diameter - Journal #1

62.199-62.217 mm

2.4488-2.4495 in

  • Crankshaft Journal Diameter - Journal #2 and #3

62.191-62.215 mm

2.4485-2.4494 in

  • Crankshaft Journal Diameter - Journal #4

62.179-62.203 mm

2.4480-2.4489 in

  • Crankshaft Journal Out-of-Round - Production

0.005 mm - Maximum

0.0002 in - Maximum

  • Crankshaft Journal Out-of-Round - Service

0.025 mm - Maximum

0.0010 in - Maximum

  • Crankshaft Journal Taper - Production

0.007 mm - Maximum

0.0003 in - Maximum

  • Crankshaft Runout

0.025 mm - Maximum

0.0010 in - Maximum

Cylinder Bore

  • Diameter

101.618-101.643 mm

4.0007-4.0017 in

  • Out-of-Round - Production

0.0127 mm - Maximum

0.00050 in - Maximum

  • Out-of-Round - Service

0.05 mm - Maximum

0.002 in - Maximum

  • Taper - Production Relief Side

0.025 mm - Maximum

0.0010 in - Maximum

  • Taper - Production Thrust Side

0.012 mm - Maximum

0.0005 in - Maximum

  • Taper - Service

0.025 mm - Maximum

0.0010 in - Maximum

Cylinder Head

  • Surface Flatness

0.10 mm - Maximum

0.004 in - Maximum

Exhaust Manifold

  • Surface Flatness - Flange to Flange

0.25 mm - Maximum

0.010 in - Maximum

  • Surface Flatness - Individual Flange

0.05 mm - Maximum

0.002 in - Maximum

Intake Manifold

  • Surface Flatness

0.10 mm - Maximum

0.004 in - Maximum

Oil Pan

  • Oil Pan Alignment at Rear of Engine Block

0.3 mm - Maximum

0.011 in - Maximum

Piston

  • Piston Bore Clearance - Production

0.018-0.061 mm

0.0007-0.0024 in

  • Piston Bore Clearance - Service

0.075 mm - Maximum

0.0029 in - Maximum

Piston Pin

  • Clearance in Piston - Production

0.013-0.023 mm

0.0005-0.0009 in

  • Clearance in Piston - Service

0.025 mm - Maximum

0.0010 in - Maximum

  • Diameter

23.545-23.548 mm

0.9270-0.9271 in

  • Fit in Connecting Rod

0.012-0.048 mm - Interference

0.0005-0.0019 in - Interference

Piston Rings - End Gap Measured in Cylinder Bore

  • Piston Compression Ring Gap - Production-Top Groove

0.25-0.40 mm

0.010-0.016 in

  • Piston Compression Ring Gap - Production-2nd Groove

0.38-0.58 mm

0.015-0.023 in

  • Piston Compression Ring Gap - Service-Top Groove

0.25-0.50 mm

0.010-0.020 in

  • Piston Compression Ring Gap - Service-2nd Groove

0.38-0.80 mm

0.015-0.031 in

  • Piston Compression Ring Groove Clearance - Production-Top Groove

0.030-0.070 mm

0.0012-0.0027 in

  • Piston Compression Ring Groove Clearance - Production-2nd Groove

0.040-0.080 mm

0.0015-0.0031 in

  • Piston Compression Ring Groove Clearance - Service

0.030-0.085 mm

0.0012-0.0033 in

  • Piston Oil Ring Gap - Production

0.25-0.76 mm

0.010-0.029 in

  • Piston Oil Ring Gap - Service

0.005-0.090 mm

0.0002-0.0035 in

  • Piston Oil Ring Groove Clearance - Production

0.046-0.196 mm

0.0018-0.0077 in

  • Piston Oil Ring Groove Clearance - Service

0.046-0.200 mm

0.0018-0.0079 in

Valve System

  • Valve Face Angle

45 degrees

  • Valve Head Edge Margin

0.79 mm - Minimum

0.031 in - Minimum

  • Valve Lash

Net Lash--No Adjustment

  • Valve Lift - Exhaust

10.879 mm

0.4280 in

  • Valve Lift - Intake

10.527 mm

0.4140 in

  • Valve Lifter

Hydraulic Roller Type

  • Valve Rocker Arm

Roller Pivot Type

  • Valve Rocker Arm Ratio

1.5:1

  • Valve Seat Angle

46 degrees

  • Valve Seat Runout

0.05 mm - Maximum

0.002 in - Maximum

  • Valve Seat Width - Exhaust

1.651-2.489 mm

0.065-0.098 in

  • Valve Seat Width - Intake

1.016-1.651 mm

0.040-0.065 in

  • Valve Spring Free Length

51.3 mm

2.02 in

  • Valve Spring Installed Height - Exhaust

42.92-43.43 mm

1.670-1.700 in

  • Valve Spring Installed Height - Intake

42.92-43.43 mm

1.670-1.700 in

  • Valve Spring Pressure - Closed

338-374 N at 43.2 mm

76-84 lb at 1.70 in

  • Valve Spring Pressure - Open

832-903 N at 32.3 mm

187-203 lb at 1.27 in

  • Valve Stem Clearance - Exhaust-Production

0.025-0.069 mm

0.0010-0.0027 in

  • Valve Stem Clearance - Exhaust-Service

0.025-0.094 mm

0.0010-0.0037 in

  • Valve Stem Clearance - Intake-Production

0.025-0.069 mm

0.0010-0.0027 in

  • Valve Stem Clearance - Intake-Service

0.025-0.094 mm

0.0010-0.0037 in

  • Valve Stem Oil Seal Installed Height - Measured from the Top of the Large Diameter Valve Guide Bevel to the Bottom of the Valve Stem Oil Seal

1-2 mm

0.03937-0.07874 in