GMC 1989 Light Duty Truck, Руководство по ремонту, Страница: 412 / 998

6A2-20 2.8 LITER V-6
7. Main bearing caps with arrows pointing toward the
front of the engine.
8. Main bearing cap bolts.
Tig h ten
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• All main bearing caps EXCEPT NUMBER
THREE CAP to 95 N-m (70 ft. lbs.).
• Number three main bearing cap to 15 N-m (11
ft. lbs.). Then tap the end of the crankshaft
rea rw a rd and th e n fo rw ard w ith a lead
hammer to line up the rear main bearing and
crankshaft thrust surfaces.
• All main bearing caps to 95 N-m (70 ft. lbs.).
M easure (Figure 30)
Crankshaft end play.
1. Tap the end the crankshaft first rearward then
forward with a lead hammer. This will line up
the rear main bearing and crankshaft thrust
surfaces.
2. With the crankshaft forced forward, measure
at the front end of the num ber three main
bearing with a feeler gage (figure 30). The
proper clearance is 0.06 to 0.21 mm.
Inspect
Crankshaft for binding. Try turning the crankshaft to
check for binding. If the crankshaft does not turn
freely, loosen the main bearing cap bolts, one pair at
a time, until the tight bearing is located. Burrs on the
bearing cap, foreign matter between the insert and
the block or the bearing cap, or a faulty insert could
cause a lack of clearance at the bearing.
B
85
A. A lig n m e n t H o le In C ra n k s h a ft
B. D u st Lip
C. D ow el Pin
D. C o lla r
E. M an drel
F. S cre w s
85 C ra n k s h a ft Rear O il Seal
B-07973
Figure 31— Installing the Crankshaft Oil Seal
REAR CRANKSHAFT OIL
SEAL INSTALLATION
+ + Install or C onnect
Tool Required:
J 34686, Seal Installer
1. Light coat of oil to the inside diameter of the new
seal.
2. New seal over the mandril of J 34686 until the dust
lip (back of the seal) bottoms against the collar of
the tool (figure 31).
3. J 34686 to the crankshaft by hand or torque the
attaching screws to 4 N-m (3 ft. lbs.).
• Align the dowel pin of J 34686 with the dowel
pin hole in the crankshaft.
4. Light coat of oil to the outside diameter of the seal.
5. Seal into the bore.
• Turn the “ T ” handle of the tool so the collar
pushes the seal into the bore.
• Turn the handle until the collar of the tool is
tight against the cylinder block to seat the seal
properly.
• Loosen the “ T ” handle until it comes to a stop.
• Remove the attaching screws.