G643 (E) Service Manual Chapter 3. Engine Mechanical System
84
Figure 12-46 Oil Pump and Components
Clean
• All parts in clean solvent and dry them with
compressed air.
Inspect
• Pump body for cracks, wear, or other damage.
• Inside of the cover for cracks and wear that would
permit oil to leak past the ends of the gears.
• Idler and drive gears for wear.
• Drive gear and shaft for lack of fit in the pump
body.
IMPORTANT: The pump gears, cover, and body
are not serviced separately. If any of the parts
are damaged or worn, the entire oil pump
assembly must be replaced.
Inspect
• Oil pump screen damage or loose fit of the pipe.
• Pressure regulator valve for fit. The regulator
valve should slide freely in its bore without
sticking or binding.
Install or Connect
Tool Required:
J 21882 Pickup Tube and Screen Installer
1
. Pressure regulator valve into the pump cover.
IMPORTANT: Replace the pressure relief valve
spring when reusing the oil pump assembly.
2
. Pressure regulator spring into the pump cover.
3
. Retaining pin into the pump cover.
4
. Drive gear and shaft into the pump body.
5
. Idler gear into the pump body.
IMPORTANT: Match together the index marks on
the two gears made during disassembly.
6
. Pump cover.
NOTICE:
Refer to “Notice” on page 1.
7
. Bolts.
Tighten
• Bolts to 12 N
·
m (106 lb. in.)
