Pontiac Fiero 1988 Service Manual page 310

2.5L ENGINE 6 A 1 9
Important
® Rotate engine to T.D.C. on No. 1 and No,
4 cylinders.
• Measure from block to first cut of double
notch on reluctor ring (see figure 14).
© Dimension should be 1-11/16 (42.8 mm).
m Mount balancer with counterweights
parallel and pointing away from crankshaft
(see figure 15). Do not move crankshaft.
Oil pan.
Fig 14 Crankshaft Positioning
COUNTERWEIGHTS
J 2 0 0 0 2 - 6 1 4
Fig. 15 Counterweights Correctly Positioned
OIL P U M P / P R E S S U R E REGULATOR V A L V E
Remove or Disconnect
Oil pan.
Important
It is not necessary to remove the balancer
assembly to service the oil pump or pressure
regulator valve.
LSI
L*
4^
Disassemble
1. Restrictor.
2. Filter.
3. Oil pump cover assembly.
4. Oil pump gears.
5. Pressure regulator valve.
Plug or pin.
Spring.
Valve. If the valve is stuck, clean the valve
and pump housing with carburetor cleaning
solvent.
C A U T I O N : The 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 , or r e m o v i n g t h e 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 .
Clean
All parts of sludge, oil and varnish.
Varnish on parts 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 of 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 .
W h e n w o r k i n g o v e r h e a d , w e a r e y e
p r o t e c t i o n .
Inspect
For foreign material and determine its source.
Pump housing and oil pump cover assembly for:
Cracks
Scoring
Casting imperfections
Pressure regulator valve for:
Scoring
Sticking. Burrs may be removed with a fine
oil stone.
Pressure regulator valve spring for:
Loss of tension
Bending
If in doubt, replace the spring.
Screen assembly for:
Looseness
Broken wire mesh or screen
Gears for:
Chipping
Galling
Wear
Measure
Gear housing pocket depth
Gear thickness
Important
• When deciding pump servicability based on
pocket depth, consider depth of wear
pattern in gear pocket and face of oil pump
cover assembly.
Assemble
1. Lubricate all internal parts with engine oil.