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YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual
• Insert the 0.028 end of the Valve Clearance Gage (ST-23) between the valve rocker
assembly and the valve stem cap. If it cannot be inserted, remove the current push
rod and use a shorter push rod.
• Try to insert the 0.080 end of the Valve Clearance Gage (ST-23) between the valve
rocker assembly and the valve stem cap. If it can be inserted, remove the current
push rod and use a longer push rod.
(c) The distance must be between 0.028 and 0.080 in. (0.711 to 2.032 mm) (Figure 46).
NOTICE: If the clearance is not within the prescribed limit, insert a longer or shorter
J. Lubricate the valve rocker contact surfaces (Figure 48) with Modoc
NOTICE: If a cork rocker box cover gasket is installed, torque the rocker box cover screws to
50 in.-lb. (5.6 Nm). Do not reuse cork gaskets.
K. Examine the silicone rocker box cover gasket to make sure it is intact and not deformed or
damaged. Replace as necessary.
L. Install the silicone rocker box cover gasket and rocker box cover with screws on each rocker
box. Torque the screws to 35 in.-lb. (4.0 Nm).
M. Remove the vented plug from each spark plug hole.
N. Install the top and bottom spark plugs as per the section "Spark Plug Installation" in Chapter
74-20.
O. Remove the caps from the primer line and primer nipple assembly (Figure 11) and reconnect
the primer line to the primer nipple assembly. Refer to the "Primer Line Installation" and
"Primer Nipple Assembly Installation" procedures in Chapter 73-10 for primer line and
primer nipple assembly installation.
P. Install the applicable intake pipe on the cylinder per the "Intake Pipe Installation" procedure
in Chapter 72-80. Install the applicable exhaust pipe on the cylinder per the airframe
manufacturer's instructions.
Q. Be sure to install the cushioned clamps to attach the primer line to the intake pipe.
R. Complete the oil change, add oil to the engine per instructions in Chapter 12-10.
© 2021 Avco Corporation. All Rights Reserved
February 2021
push rod to obtain the correct clearance. Refer to the latest revision of
Service Instruction No. SI-1060 or the YO-233-B2A Illustrated Parts
Catalog for available push rods.
Figure 48
Valve Rocker Lubrication
®
Oil 175.
72-30
Page 139
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