8.2.3. Oil gallery cooling type piston (P086TI)
Oil gallery cooling is used for the piston
of P086TI generator engine.
When thermal loading is high, piston
cooling by means of an oil gallery in the
crown is normally necessary to pre-
vent crown cracking and ring sticking.
The design of the gallery, the design and
location of the oil spray nozzle and the
quantity of oil flowing in the gallery are
critical in order to achieve the desired
temperature reduction.
The cross section shape of the gallery
should be designed to achieve sufficient
oil movement to maximize cooling effi-
ciency.
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