Download General Aviation Modifications, Inc.

General Aviation Modifications, Inc.
Trouble
Engine Power Increases Slowly
Or Severe Manifold Pressure
Fluctuations When Throttle
Advanced.
Engine Power Increases Rapidly
And Manifold Pressure
Overboosts When Throttle
Advanced.
Probable Cause
Pressure relief valve out of
adjustment or defective.
Remedy
Replace Pressure relief valve if
defective.
Wastegate operation is sluggish.
Lubricate and adjust wastegate.
Correct cause of sluggish operation.
Replace Wastegate if defective.
Oil temperature not to operating
standards.
Wastegate operation is sluggish.
Warm up oil temperature and try
again.
Lubricate and adjust wastegate.
Replace Wastegate if defective.
Advance throttle smoothly.
Adjust oil pressure to proper limits
per Lycoming Direct Drive Engine
Overhaul Manual.
Factory adjustments required or
replace pressure relief valve if
defective.
Verify connections. If connected
properly replace CHT probe.
Reset timing to correct setting.
Throttle advanced too rapidly.
Verify oil pressure is in proper
operating limits.
Pressure relief valve out of
adjustment or defective.
High Cylinder Head
Temperature.
Defective cylinder head
temperature indication.
Engine timing incorrectly set.
Restricted fuel discharge nozzle.
Engine baffles loose, or heat
shields bent or missing.
Engine will not deliver rated
power.
Perform GAMI lean test to identify
problem nozzle and replace or clean
as appropriate.
Install baffles or heat shields
properly. Repair or replace if
defective.
Review downloaded engine data to
verify correct operating technique
per the AFMS is being used.
Clean fins thoroughly.
LOP ops with insufficient
manifold pressure or excessive
fuel flow.
Debris accumulated on cylinder
cooling fins.
See “Low manifold pressure at take-off” below.
Turbocharger rotating assembly Free rotating assembly per Kelly
bearing seizure.
Aerospace Troubleshooting
Reference Guide.
77-6460004 Continued Airworthiness
Rev. B
P a g e | 12
12 Oct 2011