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ENGINE TOP END 4-21
Cylinder, Piston
• Remove the top and second rings with piston ring pliers.
Special Tool - Piston Ring Pliers: 57001–115
special tool is not available, carefully spread the
• Ifringtheopening
with your thumbs and then push up on the
•
opposite side of the ring [A] to remove it.
Remove the 3-piece oil ring with your thumbs in the same
manner.
Piston Installation
the expander [A] in the piston oil ring groove so that
• Install
the expander ends [B] touch together, never overlap.
the upper and lower steel rails. There is no UP or
• Install
Down to the rails. They can be installed either way.
not mix up the top and second rings.
• Do
Install
second and top rings as shown.
•The ringstheshould
turn freely in the grooves.
[A] Piston Head
[B] Top Ring for FH451V, 500V, 531V, 541V, 580V
[C] Second Ring for FH451V, 500V, 531V, 541V, 580V
[D] Top Ring for , FH601V, 641V, 680V, 721V
[E] Second Ring for FH601V, 641V, 680V, 721V
the piston and rings with the piston ring end gap as
• Align
shown.
[A]. Arrow Match Marks
[B]. Top ring End Gap, Upper Steel Rail End Gap
[C]. 30° ∼ 45°
[D]. Second Ring End Gap, Lower Steel Rail End Gap
Apply engine oil to the piston pins.
•Assemble
the pistons onto the connecting rods as follow:
No.1 cyl. Piston, align the arrow match mark on the piston
head with opposite the raised letters (K Mark) on the connecting rod.
No.2 cyl. piston, align the arrow match mark on the piston
head with K Mark on the connecting rod.
[A]. No.1 Cyl. Piston
[B]. No.2 Cyl. Piston
[C]. Arrow Match Marks
[D]. K Mark
[E]. Opposite K Mark