Lycoming YO-233-B2A - Page 99

TEO-540-A1A Engine Maintenance Manual
© 2021 Avco Corporation. All Rights Reserved 12-30
February 2021 Page 79
YO-233-B2A Engine Maintenance Manual
Table 1 (Cont.)
Fault Isolation Guide
Problem
Cause
Corrective Action
Ref.
Engine will not turn
static rpm or will not
develop rated rpm
(Cont.)
Fouled spark plugs
Remove and clean spark plugs
Incorrect fuel flow
Look for blocked fuel filters.
Blockage in air inlet or
manifold.
1. Make sure that the air filters
are clean.
2. Examine the induction system
for breaks in the ducts. Breaks
can let foreign material or
heated air enter the induction
system.
3. Repair or replace air inlet or
manifold if necessary.
OHM
Incorrect type of fuel
1. Replace fuel with correct fuel.
2. Also refer to "Incorrect Fuel
or Fuel Contamination" in
Chapter 05-50.
IOM
Appendix
A
Throttle lever is
incorrectly adjusted
Adjust the throttle lever in
accordance with airframe
manufacturer’s instructions.
Insufficient combustion
1. Complete the cylinder
compression check.
2. Complete the borescope
inspection to look for
excessive wear on the
cylinders or damaged valve
and valve seats.
3. Complete the top overhaul.
72-30
OHM
Incorrect crankshaft to
camshaft timing
NOTICE: This could
also cause the engine not
to start.
Make sure that the crankshaft-to-
camshaft timing is correct.
OHM
Engine will not supply
the rated power
Blockage in manifold
system
Clear all ducting.
Leak in intake or exhaust
Tighten loose connections or
replace manifold gaskets as
necessary.