Pontiac Fiero 1988 Service Manual page 284

GENERAL ENGINE MECHANICAL 6A-7
• Pump housing and cover for:
Cracks
Scoring
Casting imperfections
Damaged threads
Do not attempt to repair the pump housing.
If in doubt, replace the housing.
• Idler gear shaft, if used. If loose in the housing,
replace the pump or timing chain cover,
depending on model.
• Pressure regulator valve for:
Scoring
Sticking. Burrs may be removed with a fine
oil stone.
m Pressure regulator valve spring for:
Loss of tension
Bending
If in doubt, replace the spring.
• Suction pipe and screen assembly for:
Looseness, if permanently pressed into the
pump body. If the pipe is loose, or has been
removed, it must be replaced with a new
pump body and screen assembly.
Broken wire mesh or screen
• Gears for:
Chipping
Galling
Wear
m Drive shaft and drive shaft extension, if any, for:
Looseness
Wear
•
2.
Measure
• Refer to oil pump specifications (Figure 16)
e Gear lash. Install gears, marking toward the
timing cover and measure in several places
(Figure 17).
• Pump housing gear pocket (Figure 18)
• Gears (Figure 19)
• Gear side clearance, if applicable (Figure 20)
• Gear end clearance (Figure 21)
I V I Important
• When deciding pump servicability based on
end clearance, consider depth of wear
pattern in the pump cover and/or cover
plate.
Assemble
Lubricate all internal parts with engine oil during
assembly.
Pump gears. Gear mark facing the timing cover.
N O T I C E :
To avoid engine damage,
a l l
pump
cavities must be packed with petroleum jelly
b e f o r e
installing the gears to assure priming.
3. Cover and gasket
4.
5.
N O T I C E :
To avoid engine damage, use
o n l y
original equipment gaskets. Gasket thickness is
c r i t i c a l
to proper functioning of the pump.
Pressure regulator valve and spring
Cotter pin or plug, depending on model
Important
Plug Type - Coat threads with "Loctite
573", or equivalent.
Cotter Pin Type - Make sure the pin is
properly secured.
Tighten
Pump cover bolts to 14 N-m (124 lb. in.) 3.0 and
3.8L, and
11
N-m (97 lb. in.) 5.0L.
Pressure regulating valve plug, if any, to 20 N-m
(177 lb. in.)
Suction tube bolts to 10 N-m (90 lb. in.)
Install or Connect
Tool required:
J 8369 Suction Pipe Installer
• A new suction pipe "O" ring seal or gasket, unless
pressed in.
• Pressed in type, apply GM 1050026 sealer, Fel
Pro-Set and Seal or equivalent, to a new pipe and
tap into place with a plastic hammer, using
installing Tool J 8369.
Tighten
• Suction tube bolts to 7 N-m (62 lb. in.), unless
pressed in.
Important
• Whenever the oil pump is overhauled, clean
the oil pan of oil and sludge, replace the oil
filter and fill crankcase with clean oil.
]9
Inspect
• Remove the oil pressure sending unit and
install a pressure gage.
• Start engine and observe oil pressure
N O T I C E :
If the oil pressure does not build up
almost immediately, remove the oil pan and check
oil pump suction pipe attachment to the pump. If
necessary, dismantle the oil pump, fill all cavities
with petroleum jelly and reassemble. Running the
engine without measurable oil pressure will cause
extensive damage.
GEROTOR OIL P U M P
Disassemble
1. Remove oil filter adapter, pressure regulator
valve and valve spring.
2. Remove oil pump cover attaching screws and
cover.
3. Remove pump gears.