Cleaning and Inspection - TM-5-4320-259-340019

b. Position the assembled seal plate (14) and

i. Do not remove the volute pins (16) from the

stationary member of the shaft seal (15) on the

seal plate unless they are damaged and require

engine studs (17); secure with nuts (12) and lock

replacement. DO not remove the studs (17) from

washers (13).

the engine unless they are damaged and require

c. Install the remaining parts of the shaft seal

replacement.

(15) on the engine shaft so that the seal faces are

3-3. Cleaning and Inspection

together. Lubricate the seal faces with engine oil at

a. Discard and replace the shaft seal and the

reassembly to prevent damage to the parts by

gaskets.

running dry. Install the shims (10 and 11) and

b. Clean all remaining parts with an approved

impeller (9) on the end of the engine crankshaft.

cleaning solvent; dry thoroughly.

The impeller has a right-hand thread.

c. Inspect the impeller for cracked, distorted, or

d. Install the volute (8) on the volute pins (16)

worn vanes, damaged threads, and damaged back

on the seal plate (14). Check the impeller-to-volute

face. Replace a damaged impeller.

clearance with the volute fully seated on the seal

d. Inspect the volute for cracks and for wear of

plate. Clearance shall be 0.015 to 0.040 inch. If

the inside surfaces. Check the mounting holes for

clearance is not within the required range, remove

enlargement or elongation. Replace the volute if

the volute and impeller. Add or remove impeller

damaged.

shims as necessary. Reinstall the impeller and

e. Inspect the seal plate for cracks, distortion,

volute.

and for a damaged seal seat. Inspect the gasket seat

e. Lightly grease the gasket (6) and install it on

of the seal plate for gouges, nicks, and burrs.

the seal plate (14). Install the volute gasket (7) on

Remove any burrs with a fine stone or file. If the

the volute. Position the pump body (3) on the

volute pins are damaged, press out the damaged

pump so that the studs (4 and 5) engage the holes

pins and replace with new ones.

in the seal plate. Secure with nuts (1) and lock

f. Inspect the pump for cracks, damaged gasket

washers (2).

surfaces, worn and damaged threads, and other

f. After the pump is completely assembled, make

damage. Remove burrs from gasket seats with a

sure the spark plug cable is disconnected from the

fine stone or file. Replace any damaged studs.

spark plug to prevent the engine from starting. Use

Replace a damaged pump body.

the starter rope to turn over the engine and pump,

carefully checking the pump for binding, rubbing,

3-4. Reassembly and Installation

or other faulty operation. Correct any troubles.

a. Carefully press the stationary member of the

Reconnect the spark plug cable if no troubles are

shaft seal (15, fig. 3-1) into the seal plate (14) so

noted.

that the seal face will be toward the impeller.

3-3