Pontiac Fiero 1988 Service Manual page 289

6A-12 GENERAL ENGINE MECHANICAL
Important Measure
4.
5.
6.
• The inserts will project slightly when put
into place. Make sure they project an equal
distance on both sides. Make sure the insert
tangs are engaged.
In the case of a thrust bearing type main bearing
insert, coat the thrust surface with GM 1050169
special lubricant, or equivalent.
Lubricate the bearing surface with clean engine
oil.
Crankshaft or connecting rod.
N O T I C E :
Avoid damage to the crankshaft
journal. Use connecting rod stud protectors, or
guide pins.
Bearing cap. Tap gently into place with a suitable
tool.
N O T I C E :
In order to prevent the possibility of
cylinder block and/or main bearing cap damage,
the main bearing caps are to be tapped into their
cylinder block cavity using a brass, lead or leather
mallet before attaching bolts are installed. Do not
use attaching bolts to pull main bearing caps into
their seats. Failure to observe this information may
damage a cylinder block or bearing cap.
7. Bearing cap bolts
| ^ | Tighten
9 Bolts evenly, then back off one full turn and
torque to specification.
8. Seat the crankshaft thrust bearing (Figure 27)
1. C E N T E R MAIN B E A R I N G T H R U S T F L A N G E S
2. WOOD B L O C K
BUMP S H A F T IN E A C H D I R E C T I O N T O
A L I G N T H R U S T F L A N G E S O F C E N T E R MAIN
B E A R I N G .
G34087-6A AN
Figure 27 Seating the Crankshaft Thrust Bearing
(Typical V Engine)
I? Inspect
Pry the connecting rods back and forth and check
for binding. If necessary, loosen and retighten the
bearing cap.
m Crankshaft end play (Figure 28)
m Connecting rod side clearance (Figure 29, 30)
Figure 28 Measuring Crankshaft End Play
Figure 29 Measuring Connecting Rod Side Clearance
(Single Rod Journal)
C R A N K S H A F T
Clean
Oil, sludge and carbon
Probe oil passages for obstructions
Inspect
Keyway
Threads
Bearing journals and thrust surfaces for:
Cracks
Chips
Gouges
Roughness
Grooves
Overheating (discoloration)