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LYCOMING OPERATORS MANUAL
SECTION 4
VO, IVO & TIVO-540 SERIES
PERIODIC INSPECTIONS
CAUTION
DO NOT OPERATE THE TURBOCHARGER IF LEAKS EXIST IN THE DUCTING OR IF
AIR CLEANER IS NOT OPERATING EFFICIENTLY. DUST LEAKING INTO AIR
DUCTING CAN DAMAGE ENGINE AND TURBOCHARGER.
b. Check for dirt or dust build-up within the turbocharger. Check for uneven deposits on the impeller.
Consult Lycoming Turbocharger Manual for method to remove all such foreign matter.
c. Check for condition of the flexible hoses in the turbocharger system. Stiffness of the hose is indicative
of deterioration and if this condition is noted the hose should be replaced before further flight.
7. 400-HOUR INSPECTION (ENGINE).
In addition to the items listed for daily pre-flight, 50-hour and 100-
hour inspections, the following maintenance check should be made after every 400 hours of operation.
Valve Inspection
Remove rocker box covers and check for freedom of valve rocker when valves are
closed. Look for evidence of abnormal wear or broken parts in the area of the valve tips, valve keeper,
springs and spring seats. If any indications are found, the cylinder and all of its components should be
removed (including the piston and connecting rod assembly) and inspected for further damage. Replace any
parts that do not conform within limits shown in Special Service Publication No. SSP-1776.
8. NON-SCHEDULED INSPECTION.
Occasionally, service bulletins or service instructions are issued by
Lycoming that require inspection procedures that are not listed in this manual. Such publications usually are
limited to specific engine models and become obsolete after modification has been accomplished. All such
publications are available from Lycoming distributors, or from the factory by subscription. Consult the latest
revision of Service Letter No. L114 for subscription information. Maintenance facilities should have an up-
to-date file of these publications available at all times.
4-5
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