Cam Shaft In Stallatio; Timing Gear Cover Installation - Chevrolet 1988 Light Duty Truck Repair Manual

6A4-26 4.8 LITER L6
Figure 50—Measuring Crankshaft End Play
£ Tighten
• All bolts (138 and 139) EXCEPT THE REAR
MAIN BEARING CAP BOLTS to 90 N m (65 ft.
lbs.).
m
Measure (Figure 50)
Crankshaft end play.
1. Tap th e end of th e c ra n k s h a ft (154) firs t
rearward then forward with a lead hammer.
This will line up the rear main bearing and
crankshaft thrust surfaces.
2. Tighten the rear main bearing cap bolts (138)
to 90 N m (65 ft. lbs.).
3. W ith the crankshaft forced forward, measure
at the front end of the rear main bearing with a
feeler gage (figure 50). The proper clearance
is 0.002-0.006-inch.
1 3
Inspect
C ra n k s h a ft (154) fo r b in d in g . Try tu rn in g th e
crankshaft to check for binding. If the crankshaft
does not turn freely, loosen the bolts (138 and 139),
one pair at a time, until the tight bearing is located.
Burrs on the bearing cap, foreign m atter between
the insert and the block or the bearing cap, or a
faulty insert could cause a lack of clearance at the
bearing.
CAMSHAFT INSTALLATION
Install or Connect (Figures 5 and 51)
C o a t th e c a m s h a ft
S u p p le m e n t (G M p a rt n u m b e r 1 0 5 1 3 9 6 ) o r
equivalent. Coat the bearing journals with engine
oil.
C am shaft (182) into the block (115). Take care not to
dam age the cam shaft bearings (98 and 99).
Important
• Align the tim ing marks (figure 51).
2. Screws (93).
lo b e s w ith E n g in e O il
Tighten
• Screws (93) to 9.0 N m (80 in. lbs.).
TIMING GEAR COVER
INSTALLATION
|-»<-| Install or Connect (Figures 5 and 52)
Tool Required:
J-35468 Seal Installer and Centering Tool
• Apply engine oil to the lips of the seal (158).
1. J-35468 to the seal (158). The tool is necessary to
properly " ce nte r" the front seal on the crankshaft. If
the seal is not centered, it may be damaged when
the vibration dam per is installed, or it may fail
prematurely.
2. Gasket (166) to the block (115).
3. Tim ing gear cover (157), with the tool, to the block
(115) (figure 52).
4. Bolts (164).
Tighten
• Bolts (164) to 9.0 N m (80 in. lbs.).
Figure 52— Front C over Centering Tool
F-02325