Operation and maintenance manual

Overhead Set QSB4.5 and QSB6.7
Page 8-2 Section 8 - Maintenance Procedures at 5000 Hours or 4 Years
Disconnect the breather tube connection at the back of
the rocker lever cover.
In general, two types of breather tube connections are
used at the rocker lever cover:
• A clamping plate and capscrew hold the breather tube
connection to the rocker lever cover. Remove the
capscrew and clamping plate to disconnect the
breather tube connection from the rocker lever cover.
• One or two capscrew(s) directly mount the breather
tube connection to the rocker lever cover. Remove the
capscrew(s) to disconnect the breather tube
connection from the rocker lever cover.
NOTE: Some breather tube connections use internal
Torx™ capscrews to secure the breather tube connection
to the rocker lever cover.
If equipped, at the rear of the rocker lever cover, remove
the banjo bolt and sealing washers connecting the
breather oil drain line to the rocker lever cover.
NOTE: Not all engines with an internal mounted
crankcase breather are equipped with an external
breather oil drain line. On some engines the breather oil
drain line is internal to the breather connection tube (1).
NOTE: Do not remove the rocker lever gasket on engines
in which the rocker lever cover gasket is fit into a groove
at the base of the rocker lever cover. The gasket is
reusable. Once the gasket is removed from the rocker
lever cover, it must be replaced.
Remove the mounting nuts and isolators from the rocker
lever cover.
NOTE: If equipped, it may be necessary to gently pry the
breather tube connection from the back of the rocker lever
cover while removing.
Remove the rocker lever cover.