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3.9L ENGINE
9 - 35
ENGINE SPECIFICATIONS—3.9L (CONT.)
CAMSHAFT
Drive
Bearings
Number
Diametral Clearance
.
Maximum Allowable before Reconditioning .
Thrust Taken By
End Play
Maximum Allowable
CAMSHAFT JOURNALS
Diameter
No. 1
No. 2
No. 3
No. 4
CAMSHAFT BEARINGS
Diameter
No. 1
No. 2
No. 3
No. 4
VALVE TIMING
Intake Opens (BTC)
Intake Closes (ABC)
Exhaust Opens (BBC)
•.
Exhaust Closes (ATC)
Valve Overlap
Intake Valve Duration
Exhaust Valve Duration
TIMING CHAIN
Number of Links
Pitch
Width
TAPPETS
Type
Body Diameter
Clearance in Block
Service Tappets Available
Dry Lash
CYLINDER HEAD
Valve Seat Run-Out (Maximum)
Intake Valve Seat Angle
Seat Width (finish)
Exhaust Valve Seat Angle
Seat Width (finish)
Cylinder Head Gasket (Thickness compressed)
VALVE GUIDES
Type
Guide Bore Diameter
VALVES—(INTAKE)
Head Diameter
Length (overall)
Stem Diameter (Standard)
Stem to Guide Clearance
Maximum Allowable by rocking method
—
Face Angle
Valve for Service (oversize stem diam.)
Lift (Zero lash)
Chain
Steel Backed Babbitt
4
.001"—.003"
.005"
Thrust Plate
.002"— .010"
.010"
1.998"—1.999"
1.967"—1.968"
1.951"—1.952"
1.5605"—1.5615"
2.000"—2.001"
1.984"—1.985"
1.953"—1.954"
1.5625"—1.5635"
10°
50°
52°
16°
26°
240°
248°
68
.375"
.875"
Hydraulic Roller
.9035"—.9040"
.0011"— .0024"
Std., .001", .008", .030"
.060"—.210"
.003"
45°—45-1/2°
.065"—.085"
45°—45-1/2°
.080"—.100"
.033"
Cast in Head
.374"— .375" Std.
1.780"
4.962"—4.987"
.372"—.373"
.001"—.003"
.017"
4 4 - l / 2 ° - 4 5 °
Std., .005", .015", .030 "
.373"
J9009-104
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