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• Clearances
• Measurements
H. Specific engine parts must be lubricated prior to installation. If parts are not correctly
lubricated, or if an unapproved lubricant is used, engine parts could become scored before the
engine oil has lubricated the engine during the first cycle of operation. This scoring can cause
premature part failure, or, in some cases, engine failure. As preventive action, during engine
component replacement, apply the approved lubricant for specified components identified in
the latest revision of Service Instruction No. SI-1059.
I. If an engine start is required to complete a maintenance procedure, make sure that if you do
not see oil pressure (greater than 0) indication within 10 seconds after engine start or oil
pressure does not continue to increase above the published minimum pressure in the next 20
seconds, stop the engine. Identify and correct the problem before another engine start.
J. Complete the Operational Ground Check prior to and after each inspection, after
maintenance, and engine assembly. Refer to Chapter 72-00.
7. General Engine Inspection Criteria
During visual inspection, replace engine components including the crankcase, oil sump, and
accessory housing with:
• Replace the crankcase, oil sump, or accessory housing if there is any raised metal on surfaces
• Replace the crankcase, oil sump, or accessory housing if there is any scratch, ding, dent, or
pit, that exceeds 0.050 in. (1.27 mm) depth
• Replace the crankcase if the dowels do not fully seat into the crankcase holes
• Replace any bent, damaged, or stripped studs, refer to Appendix A
8. Requirements for Engine Maintenance
A. These engines must be maintained using Lycoming Engines' approved methods and
procedures.
B. Refer to the latest revision of Service Bulletin No. SB-240 for a list of parts must be replaced
whenever they are removed.
9. Approved Parts
CAUTION:
LYCOMING DOES NOT GIVE APPROVAL FOR USE OF PARTS
MANUFACTURER APPROVAL (PMA) PARTS ON ITS ENGINES.
LYCOMING INSTALLATION INSTRUCTIONS DO NOT APPLY TO PMA
PARTS. EQUIPMENT FAILURE COULD OCCUR IF LYCOMING
INSTRUCTIONS ARE USED TO INSTALL PMA PARTS. DAMAGES
RELATED TO THE INSTALLATION OF PMA PARTS COULD VOID THE
WARRANTY.
Lycoming Engines recommends these engines be maintained using only genuine Lycoming parts
(PMA parts have not been approved for use by Lycoming Engines).
Refer to the YO-233-B2A Illustrated Parts Catalog for genuine Lycoming parts.
Before installing a component, complete a check of the shelf-life of the part as per the latest
revision of Service Letter No. L247.
05-00
Page 4
YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual
© 2021 Avco Corporation. All Rights Reserved
February 2021
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