Thrush Aircraft S2R–T660 Maintenance Manual page 30

THRUSH AICRAFT INC - T660 TURBO THRUSH
G. If an engine is to be operated with an oil brand or type that differs from that on which it
previously operated or if the oil system has been contaminated by other than metallic matter,
the oil system should be flushed by following the steps below.
1. Place suitable containers or drip pan under the engine.
2. Remove the oil drain plug or chip detector from the reduction gearbox and the
plugs from the inlet case and the accessory gearbox housing.
3. With the drains open, place the starting control lever to cutoff and the ignition
switch to off. Motor the engine with the starter only to allow the scavenge pumps
to clear all lubricating oil.
4. Reinstall all drain plugs and the chip detector.
5. Refill the engine oil tank with new type oil.
6. Start the engine and run at idle speed for a minimum of two minutes.
7. Feather the propeller.
8. Shut down the engine.
9. Repeat Steps 1. through 3.
10. Remove the main oil filter. Clean or replace the filter and reinstall.
11. Remove the reduction gearbox oil strainer and clean. Reinstall the strainer.
12. Reinstall all engine drain plugs and the chip detector. Tighten, torque, and
lockwire.
13. Repeat Steps 5. through 8.
14. Check the oil levels and replenish, as necessary.
15. Install the filler cap and dipstick assembly in the filler tube. Ensure that the cap is
correctly installed and locked.
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AIRCRAFT MAINTENANCE MANUAL
** CAUTION **
Limit the engine rotation to a minimum time
which is required to accomplish the complete
draining. Also observe the starter operating
limitations.
Effective: 12/17/03