Chevrolet 1988 Light Duty Truck Repair Manual page 377

Figure 45 — Applying RTV to the Timing Gear Cover
3. Bolts (94).
T ig h ten
• Bolts to 10.0 N m (90 in. lbs.).
• Remove J 34995 from the tim ing gear cover.
2.5 LITER L4 ENGINE 6A1-25
CRANKSHAFT PULLEY HUB
-►+ Install or C o n n ec t (F ig u res 5 and 47)
1. C rankshaft pulley and hub. Slide the hub on the
crankshaft until it bottoms against the crankshaft
gear.
2. Bolt (98) and washer (99).
£
T ig h ten
• Hub retaining bolt to 220 N-m (160 ft. lbs.).
PISTON AND CONNECTING ROD
+«- Install or C o n n ect (F ig u res 5, 48 and 49)
Tool Required:
J 8037 Piston Ring Compressor
• Make sure the cylinder walls are clean. Lubricate
the cylinder wall lightly with engine oil.
• Make sure the piston is installed in the m atching
cylinder. Refer to " Piston and C onnecting Rod
A ssem blies" in this section.
1. Connecting rod bearing inserts (55).
• 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.
2. Piston and connecting rod to the proper bore.
B-07970
• 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.
• W ithout 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 m atching bore. Using
light blows with a ham m er handle, tap the
piston down into its bore. At the same time,
guide the connecting rod into position on the
crankpin. Hold the ring com pressor against
the block until all the rings have entered the
cylinder bore.
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
ro lle d fille t on the c ra n k s h a ft jo u rn a l to in c re a s e
crankshaft strength. Do not grind a crankshaft with a
rolled fillet. Undersize bearings other than 0.001-inch
undersize are not available.
M easu re
C o n n e c tin g
GENERAL ENGINE MECHANICAL (SEC. 6A).
INSTALLATION
INSTALLATION
rod b e a rin g c le a ra n c e . R e fe r to