A. When To Adjust
Valve clearance should be checked and
adjusted after
135
hours of operation, or as a
possible remedy for low compression. Normal
compression range for this engine is 90-125
PSI. (See master repair manual for test
procedure and other causes of low
compression.)
B. Tools Required:
8 mm combination or box-end wrench (never
use open-end or adjustable end (Crescent-
type) wrench.
.003" and .004" (.08 mm and .11 mm) feeler
gauges.
2.5 mm Allen driver
C. Cold Specifications:
Intake clearance: .003" / .08 mm
Exhaust clearance: .004 / .11 mm
Do not exceed .014" / .35 mm clearance.
D. Before Proceeding
Make sure engine is cold.
Reassemble engine (except valve cover )
before loosening adjusting hardware.
Loosen rocker arm adjusting nut just prior to
performing adjustment procedure.
E. Preliminary Inspections
Before making valve clearance adjustments, it
is important to first inspect the pushrods and
the cam lobe. If these components are
defective, it will be impossible to obtain the
correct clearance adjustments.
F. Pushrod Inspection
Check the ends for wear; replace if wear is
visible.
Valve Clearance Adjustment
Section
4
Tools/Specs
IMPORTANT!
Preliminary
Measures
Visually Inspect end of pushrod
Measuring pushrod length.
Roll pushrod over flat, hard surface to
assure that it is straight.
Edition 2 • 09/2007
8
