Propeller Oil Control Leak Test - Lycoming TEO-540-C1A Maintenance Manual

TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual

26. Propeller Oil Control Leak Test

A. The purpose of this leak test is to identify any leaks, blockages (tight clearance) or openings
(excessive clearance) of the propeller governor oil passages.
B. Complete this leak test (with the propeller installed on the engine) if any of the following
conditions occur:
• During engine assembly
• Suspect damaged propeller governor
• Sluggish propeller operation
• Engine does not hold rpm during cruise, climb, or descent
• Engine front main bearing has too much clearance
• Engine goes into feather during landing rollout with a decreased throttle setting
(1) Remove the propeller governor from the engine per the airframe manufacturer's
instructions.
NOTICE: In the following steps, to prevent an air leak, use a propeller governor gasket
P/N 72053 with test plate P/N ST-483 (Figure 101). Refer to the latest revision
of Service Instruction No. 1462 for any updates.
(2) Install the gasket and the test plate P/N ST-483, or equivalent on the governor pad with
the air fitting in alignment with the governor oil passage that goes to the front bearing
(forward hole) or left side of the mounting facing the pad. Refer to Figure 101.
© 2018 Avco Corporation. All Rights Reserved
November 2018
Figure 101
ST-483 Test Plate
72-20
Page 189