Tech-
nical
Service
inspec-
tion
Monthly Weekly
GENERAL-Continued
Publications. See that a copy of this technical manual and LO 5-1185 are on the
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equipment and in serviceable condition. Standard Form 91, Operator's Report of
Motor Vehicle Accident, must be included on all self-propelled equipment.
Appearance. Inspect the general appearance of the unit, paying particular attention to
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cleanness, legibility of identification markings, and condition of paint.
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Correct or report any deficiencies noted.
Modifications. See if all available modification work orders applying to this unit have
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been completed and recorded on DA Form 478, Organizational Equipment File.
ENGINE AND ACCESSORIES
Cylinder head, manifold, and gaskets (engine). Inspect the cylinder head, manifold, and
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exhaust pipe for leaks, loose bolts and nuts, and defective gaskets. Check the
condition of the exhaust muffler.
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Tighten any loose bolts and nuts. Replace defective gaskets. On new or reconditioned
engines, check the cylinder-head bolts for tightness at the first weekly service (par.
Valve mechanism. Check the valve adjustment if excessive tappet noise or loss of
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power is noted. The correct valve-tappet clearance with the engine warm is 0.014
inch.
Adjust valve clearance if necessary (par. 136b). See that the valve cover gasket is in
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good condition and that the cover fits securely
Compression test. Test the compression of all cylinders and record readings on DA
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Form 464. For normal compression pressure at cranking speed with the engine at
operating temperature, see paragraph 137.
Crankcase. Inspect the crankcase for leaks. Inspect the crankcase breather for dirt or
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damage.
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Correct or report any oil leaks noticed. Change oil and clean the breather if necessary.
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Inspect the oil filter assembly and connections for leaks while the engine is running.
Radiator. Inspect the radiator for leaks, obstructions in the core air passages, and
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loose mounting bolts. Check the operating temperature and condition of the coolant.
If the coolant temperature remains below 140 F. or rises above 190 F. during
operation, the thermostat may be defective. If antifreeze is used, check the freezing
point of the coolant.
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Drain, flush, and refill the cooling system if the coolant is contaminated with rust or dirt
(par. 128). See that the core air passages are clean. Renew any damaged or
defective cooling system hose, line, or gaskets. See that
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