GMC 1989 Light Duty Truck Repair Manual page 421

All specifications are in M IL L IM E T E R S unless otherw ise noted.
C R A N K S H A FT
D ia m e te r - 3 D ots
D ia m e te r - 2 D ots
Main D ia m e te r - 1 D ot
Journal Taper
O ut of Round
M ain Bearing C learance
C rankshaft End Play
D iam eter
D iam eter —
C rankpin
Taper
O ut of Round
R od Bearing C learance
Rod Side C learance
CA M SHA FT:
Lift
Journal D iam eter
Journal C learance
VALVE SYSTEM :
Lifter
R ocker Arm Ratio
Intake
Valve Lash
Exhaust
Face Angle [Intake & Exhaust)
Seat Angle (Intake & Exhaust)
Seat R unout (Intake & Exhaust)
Intake
Seat W idth
Exhaust
Stem C learance
Free Length
Valve Pressure
Spring
N @ mm
Installed height
Valve Spring Free Length
D am per Approx. # of Coils
SPECIFICATIONS
ENGINE SPECIFICATIONS (CONT.)
2 Dots
—
1 Dot
Intake
Exhaust
Closed
Open
2.8 LITER V-6 6A2-29
67.241-67.249
67.249-67.257
67.257-67.265
0.005 (M axim um )
0.005 (M axim um )
0.041-0.081
0.06-0.21
50.758-50.771
50.771-50.784
0.005 (M axim um )
0.005 (M axim um )
0.035-0.095
0.16-0.64
6.65
6.94
47.44-47.49
0.026-0.101
H ydraulic
1.50:1
One And One H alf Turns
Down From Zero Lash
0.05
1.25-1.50
1.60-1.90
0.026-0.068
48.5
391 @ 40
867
@ 30
40
47.2
4
F-05525