GMC 1989 Light Duty Truck Repair Manual page 452

6A3-28 4.3 LITER V-6
DISPLACEMENT:
CRANKSHAFT:
Diameter
Main
Taper
Journal
Out Of
Round
Production
Main
Bearing
Clearance Service Limit
Crankshaft End Play
Taper
Crankpin
Out
Round
Rod Bearing
Clearance
Rod Side Clearance
CAMSHAFT:
Lobe
Lift + 0.002
Journal Diameter
Camshaft End Play
VALVE SYSTEM:
Lifter
Rocker Arm Ratio
Valve Lash
Face Angle (Intake & Exhaust)
Seat Angle (Intake & -Exhaust)
Seat Runout (Intake & Exhaust )
Seat Width
Production
Stem
Clearance
Service
Free Length
Valve Pressure
Spring lbs. @ in.
(Outer)
Valve
Spring
Damper
SPECIFICATIONS
ENGINE SPECIFICATIONS (CONT.)
All specifications are in INCHES unless otherwise noted.
#1
#2, #3
#4
Production
Service Limit
Production
Service Limit
#1
#2, #3
#4
#1
#2, #3
#4
Diameter
Production v
Service Lirtltt
Production
Service Limit
Production
Service Limit
Intake
Exhaust
Intake
Exhaust
Intake
Exhaust
Intake
Exhaust
Intake
Exhaust
Closed
Open
Installed Height
32
+ V "
Free Length
Approx. # of Coils
4.3L
2.4484-2.4493
2.4481-2.4490
2.4479-2.4488
0.0002 (Maximum)
0.001 (Maximum)
0.0002 (Maximum)
0.001 (Maximum)
0.0008-0.0020
0.0011-0.0023
0.0017-0.0032
0.0010-0.0015
0.0010-0.0025
0.0025-0.0035
0.002-0.006
2.2487-2.2497
0.0005
0.001 (Maximum)
0.0005
0.001 (Maximum)
0.0013-0.0035
0.0030
0.006-0.014 .<*
0.357 M '.
0.390
1.8682-1.8692
0.004-0.012
k
Hydraulic
1.50:1
One Turn Down From Zero Lash
45°
0.002 (Maximum)
V 32 -V 16
1 /l6-3/32
0.0010-0.0027
0.0010-0.0027
High Limit Production +0.001
High Limit Production +0.002
2.03
76-84 lbs. @ 1.70-in.
194-206 lbs. @ 1.25-in.
123/32
1.86
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4
V
I
*
B-07912
Y