Reciprocating Engine - Crankcase; Crankcase System Description; Crankcase Maintenance; Crankcase Inspection Procedure - Lycoming YO-233-B2A Maintenance Manual

YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual

1. Crankcase System Description

Refer to the YO-233-B2A Engine Installation and Operation Manual.
A.

2. Crankcase Maintenance

Table 1 shows the crankcase maintenance schedule of inspection and section reference.
A.
Maintenance Item
Crankcase Inspection

3. Crankcase Inspection Procedure

A. The crankcase inspection is done every 100 hours of engine operation to make sure that
hardware fasteners are torqued correctly and to identify any oil leaks, cracks, and mechanical
damage on the crankcase that must be corrected before putting the engine back into service.
B. Examine the exterior surface of the crankcase for cracks and damage. A crankcase with one
or more cracks must be replaced. Refer to the Direct Drive Overhaul Manual.
C. Examine the crankcase breather for cracks, dents, and damage. Replace a cracked, dented or
damaged breather. Refer to the Direct Drive Overhaul Manual.
D. Examine the ends of the breather tube for scoring and out of roundness.
E. Examine the crankcase through bolts to make sure the threads are not striped and the bolts are
torqued correctly. Replace any hardware that is distorted or has stripped threads. Refer to the
latest revision of the Service Table of Limits - SSP-1776, for torque values.
© 2021 Avco Corporation. All Rights Reserved
February 2021
72-20 - RECIPROCATING ENGINE – CRANKCASE
Crankcase Maintenance Items
Usual Maintenance
Necessary
Every 100 hours of engine
operation
IF A CRACKED CRANKCASE IS NOT REPLACED, OIL CAN LEAK
OUT OF THE CRANKCASE AND CAUSE ENGINE FAILURE.
Table 1
"Crankcase Inspection
Procedure" in this Chapter 72-20
Referenced Chapter
72-20
Page 93