02-40
(3) Functions
Piston transfers the combustion energy from engine to connecting rod. Especially in the direct injection
engine such as D20DTF, it provides the combustion space and largely effects to the engine performance
and exhaust gas.
Piston ring
#1 ring (Top ring) : Prevents the high pressurized combustion gas from leaking into crank chamber,
and prevents the engine oil getting into combustion chamber.
#2 ring: Scrapes the engine oil on the cylinder bore, and prevents the leaked combustion gas from #1
ring from leaking into the crank chamber.
Oil ring: Scrapes the engine oil on the cylinder bore.
Piston pin
Connects the piston the connecting rod, and transfers the linear movement of piston to connecting rod
to convert it to rotating energy
Snap pin
Locks the piston pin.
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(4) Assembling the piston
Install the piston rings with the "Y" mark on the
ring facing upwards.
Position the end gap of #1 ring at 180Ëš
away from the end gap of #1 ring.
Position the end gap of oil ring at 180Ëš
away from the end gap of coil spring, and
position the end gap of oil ring at 90Ëš away
from the end gap of #2 ring.
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