GMC T Series 1994 Repair Manual page 479

9. Pickup screen and pipe (187).
• Do not remove the pickup screen and pipe
unless replacem ent is required. The 7.4L
engine uses a pickup pipe and screen that are
welded to the oil pump assembly must be
ground off for replacement.
• The pickup pipe is press fit in the pump body to
seal it and welded to retain it (7.4L engines
only).
• Do not try to remove the screen from the pipe.
The pickup screen and pipe are only serviced
as an assembly.
Clean
All parts in clean solvent and blow dry with com­
pressed air.
Inspect
Pump body (180) and cover (182) for cracks or
other damage.
Gears (181 and 188) for wear.
Drive gear and shaft (181) for lack of fit in the
pump body (180).
Inside of the cover (182) for wear that would permit
oil to leak past the ends of the gears. The pump
gears, cover, and body are not serviced separately.
If the parts are damaged or worn, replace the
entire oil pump assembly.
Pressure relief valve (183) for fit. The regulator
valve should slide freely in its bore without sticking
or binding (figures 50 and 51).
Assemble (Figures 50, 51, and 52)
*
Tool Required:
J 21882 Pickup Tube
(5.0L and 5.7L engines)
1. Pressure relief valve (183).
2. Spring (184).
3. Spring retaining pin (185).
4. Drive gear and shaft (181).
and Screen Installer
178 179 180
178.
Oil Pump Driveshaft
179. Connector
180. Body
181. Drive Gear and Shaft
182. Cover
183. Pressure Relief Valve
184. Spring
185. Spring Retaining Pin
Cover Screws
186.
187. Pick-up Screen and Pipe
Idler Gear
188.
190.
Gasket
Figure 51— Oil Pump Components (7.4L Engines)
5. Idler gear (188) in the pump body (180) with the
smooth side of the gear toward the pump cover
opening. Index the marks made during disassem­
bly.
N O T IC E : R e f e r to " N o t i c e " o n p a g e 6 A 5 -1 .
6
. Cover (182), gasket (190) (7.4L engines), and
screws (186).
Tighten
• Screws (186) to 9 N-m (80 lbs. in.).
182
186
F9468
F9471