Rotec AEROSPORT R2800, Руководство по эксплуатации, Страница: 66 / 87

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AVOIDING HYDRAULIC LOCK
WARNING!
Hydraulic Lock procedure must be employed prior to ALL starts. Hydraulic lock is more prevalent with a hot engine
due to lower oil viscosity.
To avoid costly Hydraulic Lock on the radial engine, the following procedures have been developed to ensure the op-
timal start and shutdown are attained. A bent rod will lead to catastrophic failure in a matter of hours. To prevent that,
follow the Best Practice Start & Shutdown Procedure.
BEST PRACTICE START PROCEDURE
BEST PRACTICE ENGINE SHUTDOWN PROCEDURE
1. Check the drain cocks were left open from a previous engine start. If they were left shut then open them now and
allow the oil to drain out COMPLETELY before proceeding. No drips at all must be observed. If necessary, remove
the drain cocks completely.
2. Remove the inner most spark plug from the lower cylinders: (4 & 5 for R2800, 4, 5, 6 & 7 for R3600) and insert
foam dust plugs. If already off, then ensure the dust plugs are in place.
3. Open the intake drains (cylinder 4 & 5 for R2800, 4, 5, 6 & 7 for the R3600) and remove their dust plugs (or oil
collecting can if used instead).
4. REMOVE LOWER CYLINDER INNERMOST SPARK PLUGS (cylinder 4 & 5 for R2800, 4, 5, 6 & 7 for R3600)
5. Rotate engine by hand 8 blades.
6. Engage electric starter for a few seconds.
7. Clean up mess (if any).
8. Replace spark plugs and store dust plugs in a safe place.
9. Close intake drains once oil has stopped dripping.
10. Engage electric starter motor.
11. Switch ignition on/Magnetos on.
12. Start engine.
All radial engines by nature, when static or allowed to idle at very low rpm’s for an extended period of time, tend to ac-
cumulate excess oil in any area below the horizontal centre line of the engine’s crank case. This is not a concern during
normal operation as oil is being slung around violently by the internal works of the engine, leaving the scavenge drain
ports as the only available exits for the oil. The following procedures will minimise that collection. This will help reduce
the chance of Hydraulic Lock (HL). HL can lead to catastrophic engine failure.
1. Just prior to shutdown, it is recommended to run the engine for a short period at 50% power or around 2000
RPM. This allows the scavenge pump to suck out the excess oil from the engine and thus minimising the amount
of oil left trapped in the engine after shutdown.
2. Switches – OFF (all electrical except ignition).
3. Throttle – Idle.
4. Ignition switches OFF.
5. Auxiliary Electric Oil Scavenge Pump (optional equipment) – ON for 10-15 seconds, then OFF.
6. Master Switch – OFF
7. Intake Drain Cocks – OPEN. After the conclusion of each flight, open the drain cocks and allow any oil to drain.
8. Open ALL intake drains (use rag if hot) and install dust plug (or oil collecting can).
9. Remove one spark plug from lower cylinders (4 & 5 for R2800, 4, 5, 6 & 7 for R3600)
10. Place Warning Ribbons to indicate drains are open.
11. Hang spark plugs on clip and place on top of keys on fuel tap lever.
On subsequent re starts the less oil in the engine the better as the chance of hydraulic lock is greatly reduced.
Extended periods of Idling should be avoided as oil will not only build up in the crank case but also the risk of cylinder
glazing is increased due to reduced piston ring pressure.
ENGINE OPERATING
PROCEDURE