Pontiac Fiero 1988 Service Manual page 341

6A2-16
2.8 LITER V-6 ENGINE P CARLINE
ENGAGE AT
LEAST\
3 THREADS
103157
Figure 13 Depressing Valve Spring
O-RING.
SEAL
00
S H I E L D - ^ £ 3
V A L V E
SPRING"
S E A L
INTAKE
E X H A U S T
103142
Figure 14 Valve Stem Seal
Figures 13 and 14
Tools required:
• J23590 Air line adapter
• J5892 Valve spring compressor
• J23994 Tester
1. Rocker arm cover
2. Spark plug
3. Rocker arm
4. Push rod
6.
Install air line adapter Tool J23590 in spark plug
port and apply compressed air to hold the valves
in place.
With tool J5892 compress the valve spring
• •
Disassemble
Valve locks
Valve cap
Oil shedder (exhaust valve only)
Valve spring
Damper
7.
IS
Valve stem oil seal
Install or Connect
Assemble
Valve damper
Valve spring
m Oil shedder (exhaust only)
• Valve cap
• Valve stem seal over the valve stem and
valve guide base (intake only)
Use plastic sleeve provided.
Press over valve guide boss.
1. With tool J5892 compress the valve spring
2. Square cut "0" ring around the valve stem in the
lower groove, making sure it is not twisted.
N O T I C E :
To prevent damage from twisting, coat
seal with engine oil.
3. Valve locks. If necessary, hold them in place with
grease.
4. Release valve spring
Inspect
• Make sure valve locks are seated
• With tool J23994, apply vacuum to the
valve cap to make sure no air leaks past the
seal
Spark plug
6.
7.
8.
Tighten
• To 15 N*m (11 lb. ft.)
Push rod
Rocker arm
123 Adjust
• Valve lash
Rocker arm cover
V A L V E LIFTERS
Valve lifters should be kept in order so they may
be reinstalled in their original position. Some engines
will have both standard and .010" oversize valve lifters.
Where O.S. lifters are used, the cylinder case will
be marked with a daub of white paint "0.25" (mm) O.S.
stamped on the lifter boss (Figure 15).