Rear Crankshaft Oil Seal Installation; Camshaft, Timing Chain And Sprocket In S Ta Lla Tio; Front Cover Installation; Torsional Damper Installation - GMC 1989 Light Duty Truck Repair Manual

6A3-18 4.3 LITER V-6
A. Rear o f Block
80. Screw
81. Nut
82. Retainer
83. Stud
84. Gasket
83
Figure 27— Rear Crankshaft Oil Seal Retainer
Installation
2. Seal retainer (82).
3. Screws (80) and nuts (81).
& Tighten
Screws and nuts to 15.3 N m (135 in. lbs.).
REAR CRANKSHAFT OIL
SEAL INSTALLATION
Install or C onnect (Figure 28)
Tool Required:
J 35621 Seal Installer
Rear crankshaft oil seal.
• Lubricate the inner and outer diameter of the
seal with engine oil.
• Install the seal on J 35621.
• P osition J 35621
Thread the attaching screws into the tapped
holes in the crankshaft.
F-02922
a g a in st the cra n k sh a ft.
• T ig h te n th e
screwdriver. This will ensure that the seal is
installed squarely over the crankshaft.
• Turn the handle until it bottoms.
• Remove J 35621.
CAMSHAFT, TIMING CHAIN
AND SPROCKET INSTALLATION
-►+ Install or C onnect (Figures 29, 30, and 31)
• Coat the camshaft lobes and journals with a high
q uality engine oil supplem ent (GM Engine Oil
Supplement or equivalent).
1. Two or three 5/ie-18 bolts 100-125 mm (4-5 inches)
long into the camshaft threaded holes. Use these
bolts to handle the camshaft.
2. Camshaft to the engine (figure 30). Handle the
c a m s h a ft c a re fu lly to p re ven t d a m a g e to the
camshaft bearings.
3. Thrust plate (87) and screws (88).
Tighten
• Screws to 11.9 N m (105 in. lbs.).
4. Camshaft sprocket and timing chain.
Im portant
• Line up the tim ing marks on the camshaft
sprocket and crankshaft sprocket (figure 31).
5. Camshaft sprocket bolts.
T ighten
• Camshaft sprocket bolts to 28 N-m (21 ft. lbs.).

FRONT COVER INSTALLATION

"►+ Install or C onnect
1. Front cover gasket to the front cover.
• Use gasket cement to hold the gasket in place.
2. Front cover to the engine.
3. Front cover bolts and reinforcements.
T ighten
Front cover to block bolts to 13.6 N-m (120 in.
lbs.).
TORSIONAL DAMPER
INSTALLATION
-► 4- Install or C onnect (Figure 32)
Tool Required:
J 23523-E , Torsional D am per P u lle r and
Installer
1. Crankshaft key (if removed).
s c re w s s e c u re ly w ith a