4-8
O-200-D & X Series Engine Installation and Operation Manual
3 January 2017
Engine Operation
4-3.3. Ground Run-up
CAUTION: DO NOT operate the engine at run-up speed unless the
oil temperature is at least 75°F (24°C) and the oil pressure is within
the 30-60 psi range. Operating the engine above idle before reaching
minimum oil temperature may cause a loss of oil pressure and
engine damage.
1. Maneuver aircraft nose into wind
2. Throttle............................................................. IDLE
CAUTION: Avoid prolonged idle at low RPM to avoid spark plug
fouling.
3. Mixture............................................................. FULL RICH
4. Throttle............................................................. 900-1000 RPM
5. Maintain engine RPM between 900 and 1000 RPM for at least one minute or until
engine oil temperature exceeds 75°F (24°C).
WARNING
Absence of RPM drop during the magneto check may be an
indication of a faulty ignition circuit resulting in a condition
known as “Hot Magneto.” Should the propeller be turned by
hand, the engine may inadvertently start and cause personal
injury or death. This condition must be corrected prior to
continued aircraft operation.
CAUTION: Do not underestimate the importance of the magneto
check. When operating on single ignition, some RPM drop should be
noted. Normal indications are 25-75 RPM drop and slight engine
roughness as each magneto is switched off. RPM drop exceeding 150
RPM may indicate a faulty magneto or fouled spark plugs.
NOTE: If the engine runs roughly after single magneto operation,
increase engine speed to 2200 RPM in the BOTH position and lean the
mixture control until the RPM peaks for ten seconds before returning to
the full rich position to clear the spark plugs and smooth operation before
returning to single magneto operation.
Limit ground operation to time necessary to complete engine warm-up and pre-flight
checkout.
6. Throttle............................................................. 1700 RPM
a. Magneto Checkout
1) Ignition Switch...................................... R
RESULT: Noticeable RPM (not to exceed 150 RPM) drop and slight engine
roughness; record Left Magneto channel drop results. Maximum allowable
RPM drop spread between magneto channels is 75 RPM.
Summary of Contents for O-200-D
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