Operation and maintenance manual

QSB4.5 and QSB6.7 Overhead Set
Section 8 - Maintenance Procedures at 5000 Hours or 4 Years Page 8-5
NOTE: The clearance is correct when some resistance is
“felt” when the feeler gauge is slipped between the
crosshead and the rocker lever socket.
Measure lash by inserting a feeler gauge between the
crosshead and the rocker lever socket. If the lash
measurement is out of specification, loosen the locknut,
and adjust the lash to nominal specifications.
Lash Specifications
mm in
Intake 0.254 0.010
Exhaust 0.508 0.020
Tighten the locknut and measure.
Torque Value: 24 N•m [ 212 in-lb ]
Use the barring tool, Part Number 3824591, to rotate the
crankshaft 360 degrees.
Following the same steps and specifications as previously
stated, measure lash for the following rockers:
(E = Exhaust, I = Intake).
Four-cylinder 2E, 3I, 4E, and 4I:
Six-cylinder 2E, 3I, 4E, 5I, 6I, and 6E.
Reset if out of specification.
Install
Stud Mounted Rocker Lever Cover.
Install the rocker lever cover over the mounting
capscrews.
Install the isolators and mounting nuts.
Tighten the mounting nuts.
Torque Value: 24 N•m [ 212 in-lb ]
Capscrew Mounted Rocker Lever Cover.
Install the rocker lever cover.
Install the mounting capscrews and isolators.
Tighten the mounting capscrews.
Torque Value: 24 N•m [ 212 in-lb ]