3.1L (GEN 1) Engine Specifications

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3.1L (Gen I) Engine 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