Protect engine from dust and inclement weather, When possible, perform maintenance in a sheltered
On removal of engine components, exercise care to prevent dirt and other foreign matter from entering
the engine. Caps, plugs, or temporary covers shall be used to close all openings. Do not use tape to cover
fuel and oil openings. Tape adhesive is soluble in fuel or oil and can cause contamination.
When the gas producer fuel control, power turbine governor, check valve, or accumulator are re-
moved from the engine, use extreme care to prevent foreign materials from entering the pneumatic lines or
the ports of the component.
Always use a backup wrench on fittings when removing or installing tubing.
Before removing ignition components, disconnect the input power lead at the ignition exciter.
Carefully inspect the condition of all replacement parts before installation.
Never attempt to rotate the gear trains and rotors using a speed wrench at the tachometer drive pads.
Side loads on the speed wrench could crack the tachometer drive shaft. Rotate the gas producer gear train
and rotor using the 6799790 turning adapter at the fuel control, fuel pump, starter-generator, or spare
accessory drive pad. Rotate the power turbine gear train and rotor using the 6799790 turning adapter at
the power turbine governor drive pad.
Before disconnecting tubes and hoses, remove locknuts and bolts from cushion clamps. This prevents
damage to fittings. If the same lines are going to be reinstalled, reassembly will be easier if clamps are not
removed from lines. Remove locknut and bolt that secure the clamp, free the clamp, then reinstall bolt and
locknut loosely in the clamp.
When connecting or disconnecting tubes and hoses, use caution to prevent damage and twisting action.
When possible, use a backup wrench on fitting. As tubes and hoses are disconnected, cap or cover openings
to prevent entrance of foreign material.
To aid in reassembly, keep bolts together as they are removed from each bolt circle.
Dispose of unserviceable parts in accordance with current regulations. Discard all preformed packings
and gaskets that are removed during disassembly. Do not discard adapter gasket (sheet metal plate
with integral seals) used on sequence valve, on oil cooler, or on oil manifold unless sealing material is dam-
Keywashers are not reusable. Once used, they must be replaced by new keywashers in all applications.
All used locknuts will be tried for self-locking capabilities before being reused. Manually thread used
locknut onto bolt or stud until it stops turning. Replace locknut if bolt or stud threads go past end of lock-
Use care when assembling bolts to shank-type locknuts. Aline the bolts and engage the first few threads
manually to avoid dislodging the locknut from its seat.
During assembly, be careful not to drop nuts, washers, or other objects into the subassembly. If an object
is dropped, do not proceed further until it is removed,
Do not use excessive force to assemble mating parts. If excessive force appears necessary, inspect mating
surfaces for burrs or pickups. Remove any such defects and repair or replace defective parts.