since 1940

Lycoming or Continental Engine surges

1. Injector nozzles dirty.

2. Faulty governor.

3. Air in turbocharger controller oil lines or wastegate actuator.

4. Engine breather tube plugged.

5. Injector nozzle pressure reference system leaking.

6. Incorrect propeller governor.

7. Defective oil pump. Erratic oil pressure may be traced to the pump sucking air.

8. Propeller  blades sticking in hub intermittently.

9. Malfunctioning or sticky wastegate. On engines using mechanical wastegate's check the wastegate control cable.

10. Engine bootstrapping.

11. Cessna 172 with Avcon Conversion to Lycoming O-360. Check carburetor part number against STC. This conversion requires a richer carburetor than what is standard for the O-360 to compensate for poor mixture distribution caused by the air box design. Standard carburetor p/n 10-3878, richer carburetor p/n 10-4164.

12. Continental 520 series engines with early style Woodward propeller governor. Not enough leakage past oil transfer collar. Propeller governor bypass valve of insufficient capacity to handle volume of oil. Not all the oil pressure is bled off. Try installing a McCauley governor or updated part number Woodward.

13. Intake or exhaust system leak.

  Copyright 2000 by Sacramento Sky Ranch Inc. All rights reserved.

Copyright 2003 by Sacramento Sky Ranch Inc. All rights reserved.  Prices subject to change without notice. Not responsible for typographical or misprint.
Disclaimer: sacskyranch.com contains abundant information relating to aircraft maintenance. The information provided  is not intended to supercede or supplement the F.A.A. approved  maintenance and/or operator’s manuals. Those F.A.A. approved manuals must be utilized when performing maintenance and/or operating aircraft.