Lycoming YO-233-B2A - Page 73

TEO-540-A1A Engine Maintenance Manual
© 2021 Avco Corporation. All Rights Reserved 05-50
February 2021 Page 53
YO-233-B2A Engine Maintenance Manual
Engine Inspection Checklist After Propeller Strike for YO-233-B2A Series Engines (Cont.)
Sequential Task
Additional Information
Corrective Action
Done/Comments
6.
Complete grit-blast cleaning* of
the oil sump and engine mount
bosses with fine abrasive (150-grit
or finer).
Make sure there is no dirt, debris,
sludge, paint, or any other substance
that could prevent reliable FPI or
subsequent oil flow.
7.
Complete grit-blast cleaning* of
the engine mount brackets (if used)
with fine abrasive (150-grit or
finer).
Make sure there is no dirt, debris,
sludge, paint, or any other
substance that could prevent
reliable FPI or subsequent oil flow.
8.
Complete grit-blast cleaning* of
the accessory housing with fine
abrasive (150-grit or finer).
Make sure there is no dirt, debris,
sludge, paint, or any other
substance that could prevent
reliable FPI or subsequent oil flow.
9.
Remove and discard the existing
crankshaft gear retaining bolt and
lockplate.
Refer to the “Crankshaft
Disassembly” procedure in Chapter
72-20.
10.
Examine the crankshaft.
Refer to the “Crankshaft
Inspection” procedure and checklist
in Chapter 72-20.
11.
Examine, the crankshaft counter-
bored recess, the alignment dowel
especially at the base where it goes
into the crankshaft, the bolt hole
threads, and the crankshaft gear for
wear, galling, corrosion, and
fretting.
Refer to the latest revision of
Service Bulletin No. 475. If the bolt
hole threads are damaged, they
cannot be repaired. Replace the
crankshaft.
12.
Clean the crankshaft, camshaft,
crankshaft gear, rollers and
bushings.
Refer to procedures and guidelines
in Chapter 05-30.
Make sure there is no dirt, debris,
sludge, paint, or any other
substance that could prevent
reliable magnetic particle
inspection or subsequent oil flow.
13.
Clean the following internal parts
made of steel:
• Connecting Rods
• Piston pins
• Rocker shafts
• Accessory drive gears
• Magneto drive gears
• Idler and oil pump shafts
• Shaft gears and impellers
Refer to Chapter 05-30.
* Refer to the “Grit-Blast Procedure” in Chapter 05-30.