Operation and maintenance manual

QSB4.5 and QSB6.7 Overhead Set
Section 8 - Maintenance Procedures at 5000 Hours or 4 Years Page 8-3
NOTE: Check the gasket while it is installed in the valve
cover. Once the gasket is removed from the cover it must
be replaced.
Check the gasket for cracks on the sealing surface.
Replace the gasket if damage is present.
Replace the gasket if it is removed from the groove in the
rocker lever cover.
Inspect the rubber isolators for cracks.
Replace if cracked or broken.
NOTE: If the gasket has been removed from the rocker
lever cover, a new gasket must be used.
If replacing the press-in rocker lever gasket, the following
installation procedure must be used.
• Press the molded gasket into the corners of the rocker
lever cover
• Press the rest of the gasket into the rocker lever cover.
Adjust
NOTE: Engine coolant temperature must be less than
60°C [140°F].
Use the barring tool, Part Number 3824591, to rotate the
crankshaft until the number 1 cylinder is at TDC.
TDC can be determined by the following method: