Table 6-8. Oil Pump Specifications

TM 10-3930-633-34

(4) Measure the outer race to housing

Remove the inner rotor "and shaft

(2)

clearance (fig. 6-59).

assembly, then remove the outer race.

(3) Scrape away the staking marks on the

body around the oil pressure relief valve cap. Drill

a 1/8-inch hole in the relief valve cap and insert a

self-threading s h e e t metal screw of proper

diameter into the cap. Pull the cap out of the

chamber. Remove the spring and plunger.

b. Cleaning. Wash all parts in a solvent and dry

them thoroughly with compressed air. Use a

brush to clean the inside of the pump housing and

the pressure relief valve chamber. Be sure all dirt

and metal particles are removed.

c. Inspection.

(1) Refer to table 6-8 for clearances and wear

limits.

(2) Check the inside of the pump housing and

the outer race and rotor for damage or excessive

wear or scoring.

(3) Check the mating surface of the pump

Figure 6-59. Measuring Outer Race Clearance.

cover for wear. If the cover mating surface is

worn, scored or grooved, replace the cover.

Table 6-8. Oil Pump Specifications

SPECIFICATION

ITEM

. .20.6-22.6 lb

Relief

valve

spring

tension

at 2.490 length

Drive shaft-to-housing clearance

0.0015-0.0029 in.

Relief

valve

clearance

0.0015-0.0029in

Rotor

end

play

...0.0010-0.00409.

Outer race-to-housing clearance . . . . . . . .

0.001-0.013 in.

(5) With the rotor assembly installed in the

housing, place a straightedge over the rotor

assembly and the housing. Measure the clearance

(rotor end play) between the straightedge and the

rotor and outer race (fig. 6-60). The outer race,

shaft and rotor are replaceable only as an

assembly.

Figure 6-60. Measuring Rotor End Play.

6-42