Lycoming YO-233-B2A - Subject; Ignition System - Spark Plug Maintenance (Cont.)

TEO-540-A1A Engine Maintenance Manual
12-30 © 2021 Avco Corporation. All Rights Reserved
Page 74 February 2021
YO-233-B2A Engine Maintenance Manual
Table 1 (Cont.)
Fault Isolation Guide
Problem
Cause
Corrective Action
Ref.
Engine will not start
or starts with
difficulty (Cont.)
No fuel flow
Blockage in fuel hose
1. Disconnect the fuel hose.
2. Complete the check of the fuel
flow.
3. Examine for evidence of leaks
and correct as required.
4. Clean the filters, strainers, lines,
or fuel valves.
OHM
Water in fuel system
Drain the fuel hoses.
Throttle valve open too far
Set throttle control approximately
1/4 inch open for about 800 rpm.
Flooded engine
(overpriming)
1. Turn ignition switch "on" and
put the mixture control in IDLE
CUT-OFF.
2. Fully open throttle and start the
engine.
3. If the engine does not start in 5
seconds, shut down and do not
try to start until the starter cools
down.
4. When the engine starts, decrease
throttle and advance the mixture
control slowly to FULL RICH.
Faulty ignition wire
1. Examine the ignition harness for
breaks and cracks.
2. Replace faulty wires.
Incorrect crankshaft-to-
camshaft timing
Make sure that the crankshaft-to-
camshaft timing is correct
OHM
Faulty spark plug
1. Remove the spark plugs.
2. Examine, clean, gap, test, and
replace as necessary.
74-20
Faulty harness
Remove and replace the harness as
necessary.
Cylinder compression
problem
1. Complete the cylinder
compression check.
2. Complete the borescope
inspection of low cylinder(s) to
determine if further disassembly
and repairs are necessary.
72-30