Kohler Courage SV470 Service Manual page 87

removal, clean the valve heads, faces, and stems with a power wire brush. Then, carefully inspect each valve for
defects such as warped head, excessive corrosion, or worn stem end. Replace valves found to be in bad condition.
A normal valve and valves in bad condition are shown in the accompanying illustrations.
Normal:
can be reconditioned and reused if the face and
margin are in good shape. If a valve is worn to where
the margin is less than 1/32" do not reuse it. The valve
shown was in operation for almost 1000 hours under
controlled test conditions.
Bad Condition: The valve depicted here should be
replaced. Note the warped head; margin damaged
to excessive hours or a combination of poor operating
conditions.
Inspection and Reconditioning
Leakage: A poor grind on a valve face or seat will
allow leakage, resulting in a valve burned on one side
only.
Coking: Coking is normal on intake valves and is not
harmful. If the seat is good, the valve could be reused
Section 9
9
9.7