Oil Pan And Rocker Arm Cover; Oil P U M - Chevrolet 1988 Light Duty Truck Repair Manual

6A4-18 4.8 LITER L6
201. Pressure R elief Valve
202. S pring
203
203. S pring R etaining
Pin
204. Cover Screws
205. Cover
206. Cover G asket
207. Id ler Gear
208. Drive Gear and S h a ftR
201
209. Pum p Body
140
and Pipe
202 201
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203
Figure 32— Oil Pump Com ponents
OIL PAN AND ROCKER
ARM COVER
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Parts in solvent. Remove all sludge and varnish.
Old gaskets from the gasket surfaces.
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In sp ect
— Gasket flanges for bending or damage.
— Rubber grom mets and parts on the rocker arm cover
for deterioration.
— Oil pan for rock dam age or cracks.
— Oil pan baffle for looseness.
— Drain plug threads for stripping.
OIL PUMP
❖ D isassem b le (F ig u re 32)
1. Cover screws (204).
2. Cover (205).
3. Gasket (206).
• Mark the gear teeth so the pump gears can be
installed with the same gear teeth indexed.
4. Drive gear and shaft (208).
5. Idler gear (207).
6. Spring retaining pin (203).
7. Spring (202).
8. Pressure relief valve (201).
9. Pick-up screen and pipe (140).
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B-09224
• Do not remove the pick-up screen and pipe
unless replacem ent is required.
• The pick-up pipe is a press fit in the pump
body (209).
• Do not try to remove the screen from the pipe.
The pick-up screen and pipe is serviced as an
assem bly only.
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A ll p a rts in c le a n s o lv e n t and b low d ry w ith
com pressed air.
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In sp ect (F ig u re 32)
— Pump body (209) and cover (205) for cracks or other
damage.
— Gears (207 and 208) for wear.
— Drive gear and shaft (208) for looseness in the pum p
body (209).
— Inside of the cover (205) for wear that would perm it
oil to leak past the ends of the gears.
— The pum p gears, cover, and body are not serviced
separately.
— Pressure relief valve (201) for fit. The regulator valve
should slide freely in its bore w ithout sticking or
binding.
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A ss e m b le (F ig u res 32 and 33)
Tool Required:
J-21882 Pick-up Tube and Screen Installer
1. Pressure relief valve (201).
2. Spring (202).
3. Spring retaining pin (203).
4. Drive gear and shaft (208).
5. Idler gear (207) in the pum p body (209) with the
smooth side of the gear toward the pum p cover
opening. Index the marks made during disassembly.
6. Gasket (206).
7. Cover (205) and screws (204).
T ig h te n
• Screws (204) to 7.9 N m (70 in. lbs.).
• Turn the drive shaft by hand to check for smooth
operation.
N O T IC E : B e c a re fu l n o t to tw is t, s h e a r o r
c o lla p s e the p ip e w h ile in s ta llin g .
8. Pick-up screen and pipe (140) (if removed) (figure
33).
• If the pick-up screen and pipe assem bly was
removed, it should be replaced with a new
part. Loss of press fit condition could result in
an air leak and loss of oil pressure.
• M ount the oil pum p in a soft-jawed vise.
• Apply sealer to the end of the pipe.
• Tap the pick-up screen and pipe into place,
using J-21882 and a hammer.
• The pum p screen must be parallel with the
bottom of the oil pan when installed.