PISTON, PISTON RING, PISTON PIN [L3]

BME011011010T02

Structure

• The pistons are made of aluminium alloy, which with stands 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, the front mark (←) is on the piston.
• Pistons and connecting rods cannot be disassembled because they are shrinkage fit.

Piston Specification.

ITEM

L3

Outer diameter
mm {in}
87.465-87.495 {3.4435-3.4446}
Offset quantity
mm {in}
0.8 {0.032}
Compression height: HC
mm {in}
28.5 {1.122}
Piston height: HD
mm {in}
51.0 {2.0078}

1
Piston side view
2
Piston pin center
3
Cylinder bore csnter
4
Offset
5
Outer diameter
6
Piston upper view
7
Install arrow facing engine front
8
Engine front side

• The following piston rings have been adopted: Barrel face ring for top ring, taper under cut ring for second ring, two scuff rings and an expander for 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
Side rail
5
Expander