Torsional Damper Installation; Piston And Connecting Rod Installation - Chevrolet 1991 Light Duty Truck Repair Manual

6A3-20 4.3L V6 ENGINE
Figure 33—Timing Mark Alignment
^ Tighten
• Front cover to block bolts to 14 N m (120 in.
lbs.).
TORSIONAL DAMPER
INSTALLATION
□ Install or Connect (Figures 30, 32 and 34)
Tool Required:
J 23523-E Torsional Damper Puller and Installer
1. Crankshaft key (if removed).
NOTICE: The inertia weight section of the tor­
sional damper is assembled to the hub with
rubber type material. The correct installation
procedures (with the proper tool) must be fol­
lowed or movement of the inertia weight sec­
tion of the hub will destroy the tuning of the
torsional damper.
2. Stud (item A, figure 34) to the crankshaft. Thread
the stud fully into the tapped hole in the crank­
shaft.
3. Torsional damper over the end of the stud. Align
the keyway in the torsional damper shaft with the
crankshaft key.
4. Bearing, washer and nut (figure 30).
• Turn the nut to pull the vibration damper into
place.
• Remove the tool.
NOTICE: See "NOTICE" on page 6A3-1.
5. Torsional damper bolt and washer.
l ^ | Tighten
• Bolt to 95 N-m (70 ft. lbs.).
J
A. Installation Stud
B. Nut
C. Washer and Bearing
Figure 34— Installing the Torsional Damper
ENGINE LEFT ENGINE FRONT
A. Oil Ring Rail Gaps
B. 2nd Compression Ring Gap
C. Notch In Piston
D . Oil Ring Spacer Gap
(Tang In Hole Or Slot With Arc)
E Top Compression Ring Gap
Figure 35—Piston Ring End Gap Locations
PISTON AND CONNECTING
ROD INSTALLATION
CONNECTING ROD BEARING SELECTION
Connecting rod bearings are of the precision insert
type and do not use shims for adjustment. DO NOT
FILE RODS OR ROD CAPS.
sive install a new bearing. Service bearings are avail­
able in standard size and 0.0014 mm undersize for use
with new and used standard size crankshafts.
Install or Connect (Figures 35 through 37)
Tools Required:
J 5239 Connecting Rod Guide Set
J 8037 Ring Compressor
• Lubricate the cylinder walls lightly with engine oil.
• Make sure the piston is installed in the matching
cylinder.
1. Connecting rod bearings.
• Make sure that the bearing inserts are of the
proper size.
L0707
ENGINE RIGHT
\
B7895
If clearances are exces­