MIL-STD-1227B
5.3 Maintainability. The engine installation design shall permit maximum
accessibility for replacement, servicing adjustment and repair of the engine
with minimum disturbance to adjacent parts of the end item without the use
of special tools.
Clearance shall be provided for:
5.3.1 cooling and starting system.
(a) Winding the starter rope on the pulley with a gloved (arctic
type) hand without interference.
(b) Removal of the flywheel housing and flywheel without removing
other components of the end item.
5.3.2 Fuel system.
Clearance shall be provided for:
(a) Carburetor adjustments.
(b) Removal of fuel filter.
Clearance shall be provided for:
5.3.3 Induction system.
(a) Servicing the air cleaner.
(b) Operation of winterization air control on dry-type air cleaner.
5.3.4 Lubricating system.
Clearance shall be provided for:
(a) Removal and insertion of the oil gage rod and for adding oil with
or without a removable spout or funnel.
(b) Removal and replacement of the oil drain plug and for draining
the oil. The oil shall drain completely and shall not flow over
any part of the end item. An extension to the crankcase drain
system is permissible.
5.3.5 Governor system. Clearance shall be provided for governor speed
and linkage adjustments.
5.3.6 Ignition system. Clearance shall be provided for removing, replac-
ing, and adjusting spark plugs, high tension cables, breaker points, and
capacitors.
5.3.7 valves. Clearance shall be provided for removing the rocker arm
covers and adjusting valve tappet clearance.
5.4 Engine mounting requirements. Mounting brackets shall be in accord-
ance with figures 1, 2, 3, or 4 unless other means of mounting is approved
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