13
HALF
KEYSTONE
RING
PISTON AND RINGS
Their are various types of piston and ring sets used in
840-850 models, and should not be interchanged.
The piston and ring sets on some 840-850's are of a
standard type construction. Either ring may be placed
in either ring groove of the piston.
Some 840-850 models use a half keystone upper ring.
The ring groove in the piston and on the ring have a
distinctive taper to them. The ring must be placed in the
top ring groove with the long beveled side towards the
dome of the piston as shown.
NOTE:
Piston ring end gaps should be staggered upon
installation.
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