REASSEMBLY OF BASIC ENGINE
7-5
1.8 Installing piston ring
&$87,21
Every piston ring has a top mark such as “R” near the
end gap. Install all piston rings with this mark facing
upward.
If the rings are installed upside down, it could cause
malfunctions such as excessive oil consumption or an
engine seizing.
(1) Install the piston rings to the piston with a ring
expander.
Piston and piston ring arrangement
(2) Install the oil ring with its end gap 180° away from the
joint of the coil spring, as shown in the illustration.
Installing oil ring and coil spring
1.9 Preparation for installing pistons
(1)
Lay the engine along its side.
(2) Clean the cylinder sleeve inner surface and the crank
pin with a cloth, and apply engine oil.
Lay the crankcase on its side
Preparation for installing piston
No.1, No.2
Top mark
Oil ring
No.1
compression
ring
No.2
compression
ring
Oil ring abutment
Coil spring butted ends
180°
Apply engine oil
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