Crankshaft Pulley Hub Installation; Piston And Connecting Rod Installation - GMC 1990 Light Truck Repair Manual

Figure 45—Applying RTV to the Timing Gear Cover
3. Bolts (94).
Tighten
• Bolts to 10.0 N m (90 in. lbs.).
Remove J 34995 from the timing gear cover.
Figure 46—Installing the Timing Gear Cover
2.5 LITER L4 ENGINE 6A1-25
CRANKSHAFT PULLEY HUB
-► <- Install or Connect (Figures 5 and 47)
1. Crankshaft pulley and hub. Slide the hub on the
crankshaft until it bottoms against the crankshaft
gear.
2. Bolt (98) and washer (99).
PISTON AND CONNECTING ROD
-► <- Install or Connect (Figures 5, 48 and 49)
Tool Required:
• Make sure the cylinder walls are clean. Lubricate
the cylinder wall lightly with engine oil.
• Make sure the piston is installed in the matching
cylinder. Refer to " Piston and Connecting Rod
Assemblies" in this section.
1. Connecting rod bearing inserts (55).
2. Piston and connecting rod to the proper bore.
B-07970
J-34995
CONNECTING ROD BEARING SELECTION
Service bearings are available in standard size and
0.001-inch undersize for use with new and used standard
sized crankshafts. The 2.5 L engine is designed with a
rolled fillet on the crankshaft journal to increase
crankshaft strength. Do not grind a crankshaft with a
rolled fillet. Undersize bearings other than 0.001-inch
B-07969 undersize are not available.
Measure
m
Connecting rod bearing clearance. Refer
GENERAL ENGINE MECHANICAL (SEC. 6A).
INSTALLATION
Tighten
• Hub retaining bolt to 220 N m (160 ft. lbs.).
INSTALLATION
J 8037 Piston Ring Compressor
• Be certain that the inserts are the proper size.
• Install the bearing inserts in the connecting
rod and connecting rod cap.
• Lubricate the bearings with engine oil.
• With the connecting rod cap removed. Install
two sections of 10 mm (3 /s-inch) rubber hose
over the connecting rod studs.
• Locate the piston ring end gaps as shown in
figure 48. Lubricate the piston and rings with
engine oil.
• Without disturbing the ring end gap location,
install J 8037 over the piston.
• The piston must be installed so that the notch
in the piston faces the front of the engine.
• Place the piston in its matching bore. Using
light blows with a hammer handle, tap the
piston down into its bore. At the same time,
guide the connecting rod into position on the
crankpin. Hold the ring compressor against
the block until all the rings have entered the
cylinder bore.
to