temperature. After engine has warmed up to
normal operating temperature, check valve lash
again for proper clearance.
After any mechanical work has been
done that may have disturbed the
valve lash adjustment, ensure the
rocker arm adjusting screws are
high enough to prevent rocker arms
and push rods from opening too far,
the pistons, will strike the valves
when the engine is turned over.
Observe the rocker arms of the
opposite cylinder. Rotate crank- shaft
simultaneously then continue for
approximately 1/4 revolution. At this
point, both valves are closed and
valve lash may be adjusted.
Section XXVII. MAINTENANCE OF BASE ASSEMBLY
4-88. GENERAL. This base assembly, figure 4-60,
consists of a rigid frame skid base, fuel tank, and related
components. The tank is recess-mounted in the skid
base. The engine and generator are mounted on the
skid base assembly.
Inspect the skid base and frame assembly for
rust, corrosion, breaks and loose hardware.
Inspect the fuel tank for dents, cracks, or
Inspect threaded holes in the base assembly for
Inspect the oil and fuel drain plug and hoses
between skid base and engine for leaks.
Inspect ground studs for stripped threads and
Inspect coolant and oil drain plugs for stripped
threads, deformation, or leakage.
(1) With stiff bristle brush, remove heavily
concentrated grease and dirt.
(2) Clean the skid base with cleaning solvent,
Federal Specification P-D-680.
(3) Repair cracks in skid base by welding or
brazing. Fill or sand weld marks to an even
(4) Repair threads in tapped holes by retapping.
(5) Repaint as necessary.
Fuel Tank. Warning switches and transmitter
must be removed before repairing fuel tank.
Refer to paragraphs 4-55 and 4-56 for test and
replacement of these items.
Whenever fittings are replaced on the
fuel tank, use sealing compound (MIL-
(1) Drain all fuel from tank. Flush inside of tank
with steam under pressure. Rinse with hot
water and detergent to remove flakes or
other foreign matter.
(2) Fuel tank must withstand an internal
pressure of 0.5 psi. Seal all tank openings,
apply pressure, and check for leaks (use a
leak test solution or soapy water). Should
tank leak, weld in accordance with