Pontiac Fiero 1988 Service Manual page 292

GENERAL ENGINE MECHANICAL 6A-15
INSERT FEELER GAGE AT TOP
OF RING GROOVE TO MEASURE
RING SIDE CLEARANCE.
G34164-6A-BG
Figure 34 Measuring Piston Ring Side Clearance
+4-
1 — OIL RINGS
2 - TOP COMPRESSION
RING
3 - SECOND COMPRESSION
RING
4— EXPANDER
G20031-6A
Figure 35 Piston and Rod Assembly (Typical)
3. Coat the piston pin with clean engine oil.
4. Press the piston pin into place.
Inspect
• Piston for freedom of movement
Install or Connect
Oil control ring assembly
Expander
Lower oil control ring
Upper oil control ring
1 - J-24086-11
2 - J-24086-9
3 - J-2408 6-16
G20032-6A
Figure 36 Installing Piston Pin Using Tool J 24086
2. Upper and lower compression
Manufacturers mark facing up.
ring.
N O T I C E :
Use a piston ring expander to install the
rings. Avoid expanding the rings more than
necessary, which may cause ring damage.
Important
• In order to provide an effective compression
seal, the ring gaps must be staggered (Figure
37).
Install or Connect
1. Lubricate cylinder wall and piston rings with
clean engine oil.
2. Turn crankshaft to bottom dead center.
3. Connecting rod stud thread protector, if required
(Figure 31)
4. Piston ring compressor (Figure 38)
5. Align piston and connecting rod assembly
according to the mark on the piston (Figure 35)
and insert in the cylinder.
N O T I C E :
Guide the lower connecting rod end
carefully to avoid damaging the crankshaft
journal.
6. Remove thread protectors.
7. Connecting rod bearing (refer to Connecting Rod
and Main Bearing).
8. Bearing cap.