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Engine Mechanical Specifications - LF1

Application

Specification

Metric

English

General

  • Engine Type

V-6

  • Displacement

3.0 Litre

183 cu in

  • RPO

LF1

  • VIN

G-cars/Y-trucks

  • Bore

89 mm

3.5039 in

  • Stroke

80.3 mm

3.1614 in

  • Compression Ratio

11.7:1

  • Firing Order

1-2-3-4-5-6

  • Spark Plug Gap

1.1 mm

0.0433 in

Block

  • Crankshaft Main Bearing Bore Diameter

72.867-72.881 mm

2.8688-2.8693 in

  • Cylinder Bore Diameter

88.992-89.008 mm

3.5036-3.5042 in

  • Cylinder Bore Out-of-Round - Production Max.

0.026 mm

0.001 in

  • Cylinder Bore Taper

0.020 mm

0.0008 in

Camshaft

  • Camshaft Bearing Inside Diameter - Front Number 1

35.000-35.020 mm

1.3779-1.3787 in

  • Camshaft Bearing Inside Diameter - Middle and Rear Number 2-4

27.000-27.020 mm

1.0630-1.0638 in

  • Camshaft End Play

0.045-0.215 mm

0.0018-0.0085 in

  • Camshaft Journal Diameter - Front Number 1

34.936-34.960 mm

1.3754-1.3764 in

  • Camshaft Journal Diameter - Middle and Rear Number 2-4

26.936-26.960 mm

1.0605-1.0614 in

  • Camshaft Journal Out-of-Round

0.006 mm

0.0002 in

  • Camshaft Journal to Bore Clearance

0.040-0.084 mm

0.0016-0.0033 in

  • Camshaft Lobe Lift - Exhaust

42.456-42.756 mm

1.6715-1.6833 in

  • Camshaft Lobe Lift - Intake

42.385-42.685 mm

1.6687-1.6805 in

  • Camshaft Runout - Front and Rear Number 1 and 4

0.025 mm

0.0010 in

  • Camshaft Runout - Middle 2 and 3

0.050 mm

0.0020 in

  • Valve Lift - Exhaust

10.8 mm

0.4252 in

  • Valve Lift - Intake

10.8 mm

0.4252 in

Connecting Rod

  • Connecting Rod Bearing Clearance

0.010-0.070 mm

0.0004-0.0028 in

  • Connecting Rod Bore Diameter - Bearing End

59.620-59.636 mm

2.3472-2.3479 in

  • Connecting Rod Bore Diameter - Pin End - Production

24.009-24.019 mm

0.9452-0.9456 in

  • Connecting Rod Bore Diameter - Pin End - Service Maximum

24.007 mm

0.9457 in

  • Connecting Rod Length - Center to Center

156.05 mm

6.1437 in

  • Connecting Rod Side Clearance

0.095-0.355 mm

0.0037-0.0140 in

  • Connecting Rod Width - Bearing End
  • Production

21.775 mm

0.8573 in

  • Service

21.725-21.825 mm

0.8553-0.8593 in

  • Connecting Rod Width - Pin End
  • Production

21.775 mm

0.8573 in

  • Service

21.725-21.825 mm

0.8553-0.8593 in

Crankshaft

  • Connecting Rod Journal Diameter

55.992-56.008 mm

2.2044-2.2050 in

  • Connecting Rod Journal Out-of-Round

0.005 mm

0.0002 in

  • Connecting Rod Journal Taper

0.005 mm

0.0002 in

  • Connecting Rod Journal Width
  • Production

22.000 mm

0.8661 in

  • Service

21.920-22.080 mm

0.8630-0.8693 in

  • Crankshaft End Play

0.100-0.330 mm

0.0039-0.0130 in

  • Crankshaft Main Bearing Clearance

0.010-0.060 mm

0.0004-0.0024 in

  • Crankshaft Main Journal Diameter

68.000 mm

2.6772 in

  • Crankshaft Main Journal Out-of-Round

0.005 mm

0.0002 in

  • Crankshaft Main Journal Taper

0.005 mm

0.0002 in

  • Crankshaft Main Journal Thrust Wall
  • Runout

0.000-0.040 mm

0.0000-0.0016 in

  • Square

0.000-0.010 mm

0.0000-0.0004 in

  • Crankshaft Main Journal Width, #2, 4
  • Production

24.000 mm

0.9449 in

  • Service

23.900-24.100 mm

0.9409-0.9488 in

  • Crankshaft Main Journal Width, #3
  • Production

24.400 mm

0.9606 in

  • Service

24.360-24.440 mm

0.9591-0.9622 in

  • Crankshaft Pilot Bearing Bore Diameter

20.965-20.995 mm

0.8254-0.8266 in

  • Crankshaft Rear Flange Runout

0.025 mm

0.0010 in

  • Crankshaft Reluctor Ring Runout - Maximum

2.000 mm

0.0787 in

  • Crankshaft Runout

0.030 mm

0.0012 in

  • Crankshaft Thrust Bearing Clearance

0.076-0.305 mm

0.0030-0.0120 in

  • Crankshaft Thrust Surface - Height Diameter

95.000 mm

3.7401 in

  • Crankshaft Thrust Surface Runout

0.040 mm

0.0016 in

Cylinder Head

  • 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 Guide Installed Height

14.050-14.550 mm

0.5531-0.5728 in

  • Valve Lifter Bore Diameter

12.008-12.030 mm

0.4728-0.4736 in

Lubrication System

  • Oil Capacity - With or Without Oil Filter Change

5.7 Litres

6 Quarts

  • Oil Pressure - Minimum @ Idle

69 kPa

10 psi

  • Oil Pressure - Minimum @ 2,000 RPM

138 kPa

20 psi

  • Piston Cooling Jet Valve Opening Pressure

1.7-2.3 bar

25-33 psi

Piston Rings

  • Piston Ring End Gap
  • First Compression Ring - Nominal

0.150-0.300 mm

0.0059-0.0118 in

  • First Compression Ring - Maximum, Ring in Bore

0.350 mm

0.1378 in

  • Second Compression Ring - Nominal

0.280-0.480 mm

0.0110-0.0189 in

  • Second Compression Ring - Maximum, Ring in Bore

0.450 mm

0.0177 in

  • Oil Control Ring

0.150-0.600 mm

0.0059-0.0236 in

  • Piston Ring to Groove Clearance
  • First Compression Ring

0.030-0.065 mm

0.0012-0.0026 in

  • Second Compression Ring

0.015-0.060 mm

0.0006-0.0024 in

  • Oil Control Ring

0.030-0.170 mm

0.0012-0.0669 in

  • Piston Ring Thickness
  • First Compression Ring

1.175-1.190 mm

0.0463-0.0469 in

  • Second Compression Ring

1.470-1.495 mm

0.0579-0.0589 in

  • Oil Control Ring

2.360-2.480 mm

0.0929-0.0976 in

Pistons and Pins

  • Piston
  • Piston Diameter - Measured Over Skirt Coating

88.476-89.014 mm

3.4833-3.5045 in

  • Piston Diameter - Service Limit Minimum, w/more than 10k miles

88.926 mm

3.5010 in

  • Piston Pin Bore Diameter

24.007-24.012 mm

0.9452-0.9454 in

  • Piston Ring Groove Width - First Compression Ring

1.220-1.240 mm

0.0480-0.0488 in

  • Piston Ring Groove Width - Second Compression Ring

1.510-1.530 mm

0.0595-0.0602 in

  • Piston Ring Groove Width - Oil Control Ring

2.510-2.530 mm

0.0988-0.0996 in

  • Piston to Bore Clearance - Production; Measured at Skirt Coating

0.022-0.032 mm

0.0008-0.0013 in

  • Piston to Bore Clearance - Service Limit Maximum, w/more than 10k miles

0.650 mm

0.0256 in

  • Pin
  • Gudgeon Pin Clearance to Connecting Rod Bore - Production

0.007-0.024 mm

0.0003-0.0010 in

  • Gudgeon Pin Clearance to Connecting Rod Bore - Service Maximum

0.030 mm

0.0012 in

  • Gudgeon Pin Clearance to Gudgeon Pin Bore - Production

0.007-0.015 mm

0.0003-0.0006 in

  • Gudgeon Pin Clearance to Gudgeon Pin Bore - Service Maximum

0.015 mm

0.0006 in

  • Gudgeon pin Diameter

23.997-24.000 mm

0.9448-0.9449 in

  • Piston Pin Length

60.60-61.10 mm

2.3858-2.4055 in

Valve System

  • Valves
  • Valve Face Angle

44.25 degrees

  • Valve Face Runout

0.038 mm

0.0015 in

  • Valve Face Width - Exhaust

2.750 mm

0.1083 in

  • Valve Face Width - Intake

2.180 mm

0.0858 in

  • Valve Head Diameter - Exhaust

30.470-30.730 mm

1.1996-1.2098 in

  • Valve Head Diameter - Intake

35.03-35.29 mm

1.3791-1.3894 in

  • Valve Installed Height

35.23-36.69 mm

1.3870-1.4445 in

  • Valve Length – Exhaust

97.11 mm

3.8232 in

  • Valve Length – Inlet

101.23 mm

3.9854 in

  • Valve Seat Angle Seating Surface

45 degrees

  • Valve Seat Angle - Relief Surface

30 degrees

  • Valve Seat Angle - Undercut Surface

60 degrees

  • Valve Seat Roundness- Maximum

0.025 mm

0.0010 in

  • Valve Seat Runout - Maximum

0.080 mm

0.0032 in

  • Valve Seat Width - Exhaust Seating Surface

1.400-1.800 mm

0.0551-0.0709 in

  • Valve Seat Width - Exhaust Relief Surface

0.700-0.900 mm

0.0276-0.0354 in

  • Valve Seat Width - Intake Seating Surface

1.000-1.400 mm

0.0394-0.0551 in

  • Valve Seat Width - Intake Relief Surface

0.500-0.700 mm

0.0197-0.0276 in

  • Valve Stem Diameter – Exhaust

5.945-5.965 mm

0.2341-0.2348 in

  • Valve Stem Diameter – Inlet

5.955-5.975 mm

0.2344-0.2352 in

  • Valve Stem-to-Guide Clearance - Exhaust

0.035-0.075 mm

0.0014-0.0030 in

  • Valve Stem-to-Guide Clearance - Intake

0.025-0.065 mm

0.0010-0.0026 in

  • Tappets - Stationary Hydraulic Lifter (Tappet) Assembly (SHLA)
  • Valve Lifter (SHLA) Diameter

11.989-12.000 mm

0.4720-0.4724 in

  • Valve Lifter (SHLA)-to-Bore Clearance

0.037-0.041 mm

0.0015-0.0016 in

  • Rocker Arms
  • Valve Rocker Arm Ratio

1.68 to 1

  • Valve Rocker Arm Roller Diameter

17.740-17.800 mm

0.6987-0.7008 in

  • Valve Springs
  • Valve Spring Coil Thickness

3.250 x 3.900 mm

0.1280 x 0.1535 in

  • Valve Spring Diameter - Inside Top

12.090-12.590 mm

0.4760-0.4957 in

  • Valve Spring Diameter - Outside Top

20.140 mm

0.7929 in

  • Valve Spring Diameter - Inside Bottom

17.950-18.450 mm

0.7067-0.7264 in

  • Valve Spring Diameter - Outside Bottom

26.000 mm

1.0236 in

  • Valve Spring Free Length

42.050-44.850 mm

1.6555-1.7657 in

  • Valve Spring Installed Height - Closed

35.000 mm

1.3779 in

  • Valve Spring Installed Height - Open

24.000 mm

0.9449 in

  • Valve Spring Load - Closed

247-273 N

56-61 lb

  • Valve Spring Load - Open

598-662 N

134-149 lb

   


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