Section8 OVERHAUL MANUAL LYCOMING 76 SERIES AIRCRAFT ENGINES Test Procedure
TABLE 8-2
RECOMMENDED RUN-IN SCHEDULE
RPM LOAD TIME REMARKS
1200 Prop. load 10 1500 Prop. load 10 1800 Prop. load 10 2000 Prop. load 10 2200 Prop. load 10 Check magneto drop-off*. 2400 Prop. load 10 Normal Rated** Prop. load 15 Normal Rated** Prop. load 60 Oil consumption run.
* -Do not exceed 150 RPM drop on either magneto or 35 RPM difference between magneto.
8-15. Run-In. Start the engine in accordance with the following procedure.
a.
Place mixture control in full-rich position.
b.
Turn fuel valve to on position.
c.
Set throttle at 1/10 open position.
d.
Turn magneto switch to "left" and engage starter.
(1)
Turn combination magneto starter switch to start.
e.
When engine fires move magneto switch to "Both".
(1)Combination spring loaded switches will return to "Both".
CA UTION
If oil pressure is not observed with ten (10) seconds, stop engine and determine cause.
8-16. Operate engine at approximately 1000 RPM until a minimum oil in temperature of 140°F. is obtained. Check magneto drop-off and general operation of the engine. Check the engine for oil leaks. Any malfunction or oil leak should be remedied before continuing the run.
8-17. Complete the run in accordance with the schedule listed in Table 8-2.
8-18. Oil Consumption Run. An oil consumption run should be made at the end of the run-in schedule. Oil con-sumption can be determined by the use of a scale tank through which the oil line pass and the scale reading taken at the beginning and end of the oil consumption run. Or it can be determined by draining and weighing the oil supply before and after the oil consumption run. Oil temperature should be held as closely as possible to the limits shown in Table 8-1. Oil consumption should not ex-ceed the maximum as listed in Table 8-1.
8-19. Oil Pressure Relief Valve. Subject engines are equip-ped with a non-adjustable relief valve. A brief description follows.
8-20. Non-Adjustable Oil Pressure Relief Valve. Although the valve is not adjustable, the oil pressure can be controlled by the addition of STD-425 washers under the cap as required (maximum of nine), to increase the pressure. Particles of metal or other foreign matter bet-ween the ball and the seat can cause the oil pressure to drop or fluctuate. Therefore, if a drop or excessive fluctua-tion is noted it is advisable to disassemble, inspect and clean the valve.
8-21. Idle Speed Adjustment. With the engine thoroughly warmed up, check magneto drop-off. If the magneto drop-off is normal, proceed with the idle adjustment. Close the throttle. Adjust the idle speed adjusting screw so as the engine RPM is approximately 600 RPM. After the mix-ture is adjusted it may be necessary to readjust the idle RPM to the desired speed.
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