Lower Front Cover and Oil Pump

TM 10-3930-634-34

(4) Measure the clearance between the inner and

outer rotors at each lobe (fig. 3-98, A). The clearance

should not be less than 0.004 inch or more than 0.011

inch.

(5) Measure the clearance from the face of the

pump body to the side of the inner and outer rotor (fig.

3-98, B). The clearance should not be less than 0.001

inch or more than 0.0035 inch.

(6) Inspect the splines of the inner rotor and the

drive gear. If the splines are excessively worn, replace

the parts.

(7) The rotors are serviced as matched sets; there-

fore, both rotors must be replaced as a set.

e. Reassembly.

(1) Reassemble the front cover and oil pump in re-

verse of numerical sequence as shown in figure 3-97.

(2) Apply a thin coat of non-hardening sealant to

periphery of oil seal (9). Position front cover (3) inner

face down in an arbor press and press seal with cup

side facing inward into cover until seal is flush with

outer face of cover.

(2) Clean all gasket material from the front cover

(3) If the oil pump drive gear was removed from

and the engine.

the crankshaft refer to figure 3-99 and install the

(3) Inspect the lobes and faces of the rotors for

drive gear,

scratches or burrs and the surfaces of the pump body

f. Installation.

and cover plate for scoring. Scratches, burns or score

(1) Install the lower front cover and oil pump as il-

marks may be removed with a soft stone or crocus

lustrated in figure 3-100, using a new gasket.

cloth.