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Recommended Break-In After
Cylinder Repair or Replacement
- Follow manufacturer's guidelines in
manual.
- Be sure all engine baffles, cooling
shrouds and cowling are properly in place.
- Pre-lubricate engine. Remove bottom
spark plugs and crank engine using starter until oil pressure
gauge responds. Note: In cold weather, oil and engine should be
pre-heated to 80 degrees Fahrenheit. Always use straight mineral
oil for break-in. Check oil level after pre-lube and note.
- Start engine and maintain 1200 to 1400
RPM for 3 to 5 minutes. If normal oil pressure is not reached
within 30-45 seconds, shut down engine and investigate. After
warm-up run, make any necessary repairs or adjustments.
- Let engine cool, repeat step 4 until
all discrepancies are corrected.
- A short duration power run-up (15-20
seconds) will determine if the engine is ready for in-flight
break-in.
- DO NOT CYCLE
PROPELLER. Full cycling of the prop creates unnecessary
lugging on the engine and can cause the pistons to slap and scuff
the cylinder wall which may prevent the rings from seating
properly.
- Prepare airplane for flight. Be sure
that immediate take-off is possible. Prolonged ground runs are
highly detrimental to any engine.
- Apply take-off power slowly. Climb out
at "Best Rate of Climb".
- Fly at 75% power for at least 30
minutes. Note any engine malfunctions. The cylinder head
temperature will show a rapid decrease. This indicates that the
rings have seated and cylinder break-in procedures were
satisfactorily completed.
- Measure oil consumption in accordance
with engine overhaul manual.
- Fly a similar flight as previously
outlined.
- Measure oil consumption. If too high,
fly for 45 minutes at full-rated allowable power setting or
full-throttle. Make final determination at that time.
- Always use aviation fuel during
break-in period!
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