Suction, Discharge, and Vacuum Gages, Lines, and Fittings

suction, discharge, and vacuum gages, lines, and

The drive adapter provides the rotational force

fittings as shown in figure 4-13. After assembly,

necessary to operate the tachometer-hourmeter.

start the pump and check for leaks. Correct leaks

4-30. Suction, Discharge, and Vacuum Gages,

before restoring the pumping assembly to service.

Lines, and Fittings

4-31. Tachometer-Hourmeter and Tachometer

a. Removal and Disassembly.

Drive

(1) Remove and disassemble the lines and

fittings from the gages and from the pump as shown

a. Removal.

in figure 4-13.

(1) Disconnect the flexible drive shaft (34, fig.

4-13) from both the tachometer-hourmeter (38)

(2) Remove the screws (15), nuts (13), and

and from the tachometer drive adapter on the

lock washers ( 14) that secure the gages (17, 19,

governor.

and 21) and nameplates (16, 18, and 20) to the

(2) Remove the tachometer-hourmeter from

control panel; remove the gages.

the control panel by removing screws (37), spacers

b. Cleaning and Inspection.

WARNING

(39), nuts (35), and lock washers (36).

b. Cleaning and Inspection.

Clean all parts in a well-ventilated area.

WARNING

Avoid inhalation of solvent fumes and

Clean all parts in a well-ventilated area.

prolonged exposure of the skin to

Avoid inhalation of solvent fumes and

cleaning solvent. Wash exposed skin

thoroughly.

prolonged exposure of the skin to

cleaning solvent. Wash exposed skin

(1) Clean the suction, discharge, and vacuum

thoroughly.

gages with a cloth dampened with cleaning solvent

(fed. spec. P-D-680); dry thoroughly.

(1) Wipe the exterior of the tachometer-

hourmeter and the flexible shaft with a cloth

(2) Clean all lines and fittings by washing in

dampened with cleaning solvent (fed. spec. P-D-

cleaning solvent. Shake off excessive solvent. Blow

through the lines with compressed air to make sure

680).

they are clear.

(2) Inspect the tachometer for broken dial

glass, defaced or illegible dial markings, binding or

(3) Inspect the gages for cracked dial glass,

sticking pointer, jammed digital hour counter, or

binding or sticking needle movement, illegible dial

evidence of entry of moisture. Replace a damaged

faces, evidence of water entry, and other damage. If

tachometer-hourmeter.

possible, check the operation against master gages

to assure the accuracy of the indications. Replace

(3) Inspect the tachometer shaft for kinks,

damaged gages.

broken sheathing, binding or catching rotation of

the internal shaft, and damaged threads on the

(4) Inspect the hoses for cuts, abrasions,

leaks, damaged threads, and other damage; replace

coupling nuts. Replace a damaged tachometer

shaft.

damaged hoses.

c. Installation. Installation is the reverse of

(5) Inspect all other parts for cracks,

removal; refer to figure 4-13. After installation,

distortion, damaged threads, and other damage;

replace damaged parts.

start the engine and check the tachometer for

c. Reassembly and Installation. Install the

proper operation.

Section XI. MAINTENANCE OF ENGINE

4-32. Description

(3) Remove the carburetor (para 4-20).

(4) Remove and disassemble the manifold as

The only maintenance you will be concerned with

shown in figure 4-7.

at the organizational maintenance level is servicing

b. Cleaning and Inspection.

the intake and exhaust manifold, and checking the

(1) Discard and replace all gaskets.

engine cylinder compression. The manifold is

WARNING

mounted on top of the cylinder blocks and the

Clean all parts in a well-ventilated area.

carburetor mounts to the manifold. The manifold

Avoid inhalation of solvent fumes and

serves both intake and exhaust systems.

prolonged exposure of the skin to

4-33. Intake and Exhaust Manifold

cleaning solvent. Wash exposed skin

a. Removal.

thoroughly.

(1) Remove the exhaust system parts (para 4-

(2) Clean the manifold with a wire brush. You

15).

remove greasy or gummy deposits with cleaning

(2) Remove the air cleaner piping (para 4-

solvent (fed. spec. P-D-680).

17).

4-28