Lycoming YO-233-B2A - Page 100

TEO-540-A1A Engine Maintenance Manual
12-30 © 2021 Avco Corporation. All Rights Reserved
Page 80 February 2021
YO-233-B2A Engine Maintenance Manual
Table 1 (Cont.)
Fault Isolation Guide
Problem
Cause
Corrective Action
Ref.
Engine will not supply
the rated power
(Cont.)
Oil pressure too low
1. Tighten fittings.
2. Replace oil lines, or hoses.
3. Increase oil pressure as
necessary.
Engine smokes
excessively
NOTICE: An engine
regularly smokes if it
is idling for an
extended period.
Breather is clogged
Make sure that nothing is
blocking the air flow.
Engine hesitates,
misses
Valve sticking
Refer to "Valve Sticking"
05-50
Engine surges
Low engine oil level
Complete the check of the oil
level.
12-10
Faulty governor
Leak test propeller governor.
Replace the propeller governor.
72-20
OHM
Incorrect propeller
governor
Make sure that the propeller
governor isthe correct part
number.
Breather is blocked
Examine the breather for
obstructions. Remove all
obstructions.
Faulty oil pump
Repair or replace the oil.
OHM
Propeller blades are
intermittently sticking in
hub
Remove and overhaul the
propeller.
Propeller
manufactu
rer's
instructio
ns
Front main bearing has
too much clearance
Complete the leak test. Refer to
the latest revision of Service
Instruction No. 1462.
OHM