TEO-540-C1A Engine Maintenance Manual
© 2018 Avco Corporation. All Rights Reserved
72-20
November 2018
Page 163
TEO-540-C1A Engine Maintenance Manual
Tappet Inspection Checklist for TEO-540-C1A Engine Models (Cont.)
Task
Corrective Action
Findings
Examine the plungers for collapse as follows:
A.
Align all of the removed hydraulic
plungers side by side on a clean flat
surface.
B.
Put a straight edge across the shoulder
surface of the plungers (Figure 46).
C.
Measure the distance from the straight
edge of any plunger that is not touching
the straight edge.
D.
If there is any plunger that is more than
1/32 in. (0.79 mm) below the straight
edge, the plunger is collapsed.
Discard and replace any
collapsed plunger with a new
plunger.*
Figure 46
Straight Edge Across Shoulder Surface of Plungers
Figure 47
Plunger
Disassemble and clean the acceptable (non-
collapsed, non-cracked) plunger with solvent;
back flush the plunger with solvent.
Look for a leaking check valve on the tappet
plunger as follows:
A.
Dip the plunger in engine oil.
B.
Hold the hydraulic cylinder between the
thumb and middle finger in a vertical
position with one hand as shown in
Figure 47.
C.
Hold the plunger in position where it
just enters the cylinder.
NOTICE:
Do not cover the tube
extending from the bottom of
the plunger; otherwise, the
check will not be satisfactory.
D.
Press the plunger quickly with the index
finger.
If the plunger bounces back,
the unit is satisfactory. If the
plunger does not bounce back
but stays collapsed, the check
valve is leaking and is not
seating properly. Replace the
plunger with a new plunger.*
Complete
this
valve
operational check on the new
plunger to be sure it operates
correctly.
NOTICE:
If a plunger does
not bounce back,
replace the plunger
as well as the intake
and exhaust valve.
* Refer to the latest revision of Service Instruction No. SI-1011 for part numbers.
