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3.1L (GEN 1) Engine Specifications

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  • 3.1L (Gen 1) Specifications

    General Data: All dimensions are in millimeters

    Type

    60 degree V6

    Displacement

    3.1L

    RPO

    LH0

    Bore

    89.0

    Stroke

    84.0

    Deck Height

    224

    Compression Ratio

    8.8:1

    Firing Order

    1-2-3-4-5-6

    Oil Pressure

    69 kPa @500 RPM; 205-380 kPa @ 2000 RPM

    (10 psi @ 500 RPM; 30-55 psi @ 2000R RPM)

    Cylinder Bore:

    Diameter

    89.02-89.03

    Out of Round

    0.013 (Maximum)

    Taper - Thrust Side

    0.013 (Maximum)

    Maximum Deck Warpage

    0.13

    Piston:

    Clearance

    0.023-0.056

    Piston Ring:

    COMPRESSION

    Groove Clearance

    Top

    0.051-0.089

    Second

    0.051-0.089

    Gap

    Top

    0.25-0.51

    Second

    0.51-0.071

    OIL

    Groove Clearance

    0.20(Maximum)

    Gap

    0.25-0.76

    Piston Pin:

    Diameter

    22.992-22.997

    Clearance

    0.010-0.020

    Fit in Rod

    0.018-0.046

    Crankshaft:

    Main

    Journal

    Diameter

    67.241-67.267

    Taper

    0.005 (Maximum)

    Out Of Round

    0.005 (Maximum)

    Main Bearing Clearance

    0.028-0.094

    Crankshaft End Play

    0.05-0.2

    Crankpin

    Diameter

    50.757-50.784

    Taper

    0.005 (Maximum)

    Out of Round

    0.005 (Maximum)

    Rod Bearing Clearance

    0.028-0.094

    Rod Side Clearance

    0.18-0.44

    Camshaft:

    Lift

    Intake

    6.68

    Exhaust

    6.93

    Journal Diameter

     

    Journals 1 & 4

    47.45-47.80

    Journal Clearance

    0.03-0.10

    Valve System:

    Lifter

    Hydraulic

    Rocker Arm Ratio

    1.50:1

    Valve Lash

    Intake

    1-1/2 Turns Down from Zero Lash

    Exhaust

    Face Angle (Intake & Exhaust)

    45 degrees

    Seat Angle (Intake & Exhaust)

    46 degrees

    Margin  
    Exhaust

    1.55-1.85

    Intake

    170-2.01

    Runout

    0.25

    Stem Clearance

    0.2-.0.8

    Valve Spring

    Free Length

    48.5

    Pressure

    Kg @ mm

    Closed

    41 @ 43.2

    Open

    98 @ 32.8

    Installed Height

    39.9

    Valve Spring

    Damper

    Free Length

    48.5

    Approx # of Coils

    4

    Fastener Tightening Specifications

    Item

    Nm

    Ft Lbs

    Camshaft Sprocket Bolt 24 18
    Connecting Rod Cap Nut 50 37
    Crankshaft Damper Bolt 78 58
    Cylinder Head Bolt (In Sequence) (apply thread sealant to bolts)
    First Pass 55 41
    Final Pass Add 90 degrees

    *Manifold Side*

    6 2 3 7

    5 1 4 8

    * Outer Side *

    Exhaust Manifold Bolt 24 18
    Flexplate/Flywheel Bolt 83 61
    Front Timing Cover Case Bolt
    8mm 27 20
    10mm 38 28
    Lower Intake Manifold (In Sequence)
    First Pass 20 15
    Final Pass 30 22
    Upper Intake Manifod Bolt 25 18
    Main Bearing Cap Bolt    
    First Pass 50 37
    Final Pass Add 77 degrees
    Oil Filter Adapter 68 50
    Oil Pan Rear Bolts 25 18
    Oil Pan Bolt and Nut (Except Rear 2) 10 8
    Oil Pump Bolt 41 30
    Rocker Arm Stud 46 35
    Belt Tensioner 33 24
    Throttle Body Bolts 25 18
    Timing Chain Damper Bolt 25 18
    Water Pump Pulley Bolt 24 18
    Water Pump 24 18
    Large 47 35
    Medium 21 15
    Small 10 8
    Exhaust Heat Shield Nut 9 8
    Valve Cover Bolt 8 7
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