Kubota M5040, Workshop Manual

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1-S49
M5040, M6040, M7040, WSM ENGINE
Piston Ring and Connecting Rod
1. Remove the piston rings using a piston ring tool.
2. Remove the piston pin (1), and separate the connecting rod (4)
from the piston (3).
(When reassembling)
• Be sure to fix the crankpin bearing and the connecting rod are
same I.D. colors.
• When installing the ring, assemble the rings so that the
manufacture’s mark (12) near the gap faces the top of the piston.
• When installing the oil ring onto the piston, place the expander
joint (11) on the opposite side of the oil ring gap (10).
• Apply engine oil to the piston pin.
• When installing the piston pin, immerse the piston in 80
°
C (176
°
F) oil for 10 to 15 minutes and insert the piston pin to the piston.
• Assemble the piston to the connecting rod with the
↑
mark (2)
and the connecting rod numbering mark (9) facing same side.
• The end faces of the oil ring are plated with hard chrome. In
putting the piston into the cylinder, be careful not to get the oil ring
scratched by the cylinder. Use the piston ring fitter to tighten up
the oil ring. If the ring’s planting is scratched, it may get stuck on
the cylinder wall, causing a serious trouble.
IMPORTANT
Q
• Mark the same number on the connecting rod and the piston
so as not to change the combination.
W1059589
(1) Piston Pin
(2) Mark (
↑
)
(3) Piston
(4) Connecting Rod
(5) Piston Pin Snap Pin
(6) Top Ring
(7) Second Ring
(8) Oil Ring
(9) Numbering Mark
(11) Expander Joint
(10) Oil Ring Gap
(12) Manufacture’s Mark
(A) Connecting Rod ID Color : Blue
or without Color
(B) Crankpin Bearing ID Color : Blue
or without Color
KiSC issued 06, 2008 A