PISTON, PISTON RING, PISTON PIN CONSTRUCTION [L3]

BUE011011010N02

• The pistons are made of aluminium alloy, which withstands heat and is highly conductive.
• The piston skirt is coated with graphite to reduce friction.
• The offset pistons are used to reduce piston-slapping noise.
• To prevent the piston from being reassembled in the wrong direction, a front mark (←) is on the piston.
• Pistons and connecting rods cannot be disassembled because they are shrinkage fit.

Piston Specification.

Outer diameter
mm {in}
87.465-87.495 {3.4435-3.4446}
Offset quantity
mm {in}
0.8 {0.04}
Compression height: HC
mm {in}
28.5 {1.122}
Piston height: HD
mm {in}
51.0 {2.0078}

1
Piston side view
2
Offset
3
Outer diameter
4
Piston upper view
5
Install arrow facing engine front
6
Engine front side

• The following piston rings have been adopted: Barrel face ring for top ring, taper under cut ring for second ring, 2 scuff rings and an expander for the oil ring.
• The piston pin is made of chrome steel alloy, which has superior rigidity.
• The connecting rod and the piston pin are shrinkage fit, so that it cannot be disassembled.

1
Top ring sectional view
2
Second ring sectional view
3
Oil ring sectional view
4
Expander
5
Side rail