Rotec AEROSPORT R2800, Operation Manual, Page: 64 / 87

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HYDRAULIC LOCK QUICK CHECKLIST
1. The starter motor must be wired separately from the ignition switch. Otherwise the starter cannot be used for
checking.
2. After the engine has run, open the intake drains to allow any oil to drain. If the engine is not running, the intake
drains should always be open. Intake drain locations:
Rotec R2800 – 2 lowest intake pipes
Rotec R3600 – 3 lowest intake pipes
3. Do not switch the ignition on until the starter has cranked for at least five seconds. The starter is relatively weak
and will stall if it encounters significant oil in the cylinders when starting.
4. Before each flight, perform the checking procedure. Even for brief stops.
NOTE:
Hand propping engines with minimal running time can be restrictive. This is not to be confused with hydraulic lock.
However, users need to experience the difference so that both can be recognised.
1. Check the intake drains were left open from a previous engine start*
A.) If they were left shut, open them and allow any oil to drain completely before proceeding. No drips at
all must be observed. If necessary remove the drain cocks completely.
2. Hand prop the engine with the intake drains open*
A.) If you detect a lock carefully reverse the rotation of the prop several turns backward
B.) Try normal hand propping again
C.) If the lock persists, remove the lower spark plugs and let the oil drain whilst slowly turning the prop.
Once the oil stops flowing return the spark plugs.
3. Close the intake drains
4. Double check the ignition is off
5. Use the starter motor to turn the engine over for 5 seconds
A.) If the engine does not turn over when using the starter only, then hydraulic lock is still
present. Repeat step 2.
6. If the starter turns the engine over for 5 seconds, the engine is checked for starting
PREVENTION:
CHECKING:
NOTE:
If you forget to close the intake drains and go flying, the mixture will be affected but no damage will result.
ENGINE OPERATING
PROCEDURE