Camshaft Disassembly And Inspection - Lycoming TEO-540-C1A Maintenance Manual

TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual

11. Camshaft Disassembly and Inspection

Remove and discard the spacer and retaining ring from the camshaft (Figure 31).
There are two parts to the camshaft inspection: a visual inspection and a dimensional inspection.
Copy and complete the Camshaft Inspection Checklist to do the camshaft inspection.
NOTICE If a new or reconditioned camshaft is to be installed, install new tappet bodies. Refer to
the "Camshaft Replacement Guidelines" section in the latest revision of Service
Instruction No. SI-1011 for guidelines on replacing the camshaft when new tappets are
installed in the engine.
If a hydraulic tappet body has been rejected for spalling, carefully examine the
corresponding camshaft lobe for evidence of distress, surface irregularity, or feathering
on the edges.
Camshaft Inspection Checklist for TEO-540-C1A Engines
Item
Camshaft Visual Inspection
Visually examine all surfaces of the camshaft (Figure 31) – give particular attention to bearing
surfaces and camshaft lobes. If any of the following conditions are found during this visual
inspection, replace the camshaft: cracks, scoring, galling, corrosion, pitting, feathering (at edge of
camshaft lobes or bearing), surface irregularity, distress/fatigue, or other damage
Acceptable
(No crack, scoring, galling, corrosion, pitting, feathering (at edge of camshaft
lobes or bearing), surface irregularity, distress/fatigue, or other damage)
Camshaft
Replace
Comment- condition(s) found:
Camshaft Dimensional Inspection
Support the camshaft in V-blocks and measure the
run-out. Refer to the latest revision of the Service
Table of Limits - SSP-1776. If the run-out is out of
tolerance, replace the camshaft.
Measure the OD of the camshaft at the bearing
locations and compare the results to the bearings
formed by the crankcase (per the "Crankcase
Dimensional Inspection" in this chapter.) If the OD
is not within limits, replace the camshaft.
© 2018 Avco Corporation. All Rights Reserved
November 2018
Figure 31
Camshaft with Integral Gears
Comments
Run-out
measurement:
Findings/
Corrective Action
Acceptable
Replace
Acceptable
Replace
Done
72-20
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