Pontiac Fiero 1988 Service Manual page 283

6A-6 GENERAL ENGINE MECHANICAL
4.
5.
With a steel machnist's rule or other suitable
measuring device, measure the distance from the
machined spring seat to the spring-side of the
retainer.
The measurement should be as specified in the
specific engine section. If not within
specifications, shim the valve seat as required.
Figure 12 Measuring Valve Spring Installed Height
OIL PUMP
Three types of oil pumps are used. They are the
engine oil pan (sump pump) (Figure 13), the front
cover gear type (Figure 14), or the front cover
Gerotor type (Figure 15).
1. SHAFT EXTENSION
2. PUMP BODY
3. DRIVE GEAR AND
SHAFT
4. IDLER GEAR
5. PUMP C O V E R
6. P R E S S U R E REGULATOR
VALVE
7. P R E S S U R E REGULATOR
SPRING
8. RETAINING PIN
9. S C R E W S
10. PICKUP S C R E E N AND
PIPE
34174-6 A-BG .
Figure 13 Oil Pump (Typical), S u m p Type
SUMP OR GEAR PUMPS
Disassemble
Drain oil from pump.
1.
2.
3.
Drive shaft and drive shaft extension, if any.
Suction pipe and screen assembly.
Pump cover.
Figure 14 Oil Pump, Front Cover Gear Type
[ T | 1 1 N-m (88 IN. LBS.)
[ T j OIL PUMP COVER
[ T j PUMP OUTER GEAR
PUMP INNER GEAR
5 FRONT COVER
G40027-6A5A
Figure 15 Gerotor Oil Pump
• 5. Pump gears.
6. Pressure regulator valve.
Plug or cotter pin.
- Spring.
Valve. If the valve is stuck, soak the pump
housing in carburetor cleaning solvent.
C A U T I O N : T h e p r e s s u r e r e g u l a t o r
v a l v e s p r i n g i s u n d e r p r e s s u r e .
E x e r c i s e c a u t i o n w h e n u n s c r e w i n g
t h e p l u g , o r r e m o v i n g t h e c o t t e r p i n , a s
b o d i l y i n j u r y m a y r e s u l t .
19
ciean
m All parts of sludge, oil and varnish.
© Varnish may be removed by soaking in
carburetor or cleaning solvent.
C A U T I O N : A v o i d b r e a t h i n g o f f u m e s ,
o r e x p o s u r e o f t h e s k i n t o t h e c l e a n i n g
s o l v e n t , a s b o d i l y i n j u r y m a y r e s u l t .
19 inspect