Kubota L4400 Workshop Manual page 116

L4400 , WSM
Tractor Manuals Scotland - Please Do Not Copy
Tractor Manuals Scotland
Pistons (Continued)
(When reassembling)
• Before inserting piston into the cylinder, apply enough engine oil
to the piston.
• When inserting the piston into the cylinder, face the mark on the
connecting rod to the injection pump.
IMPORTANT
• Do not change the combination of cylinder and piston. Make
sure of the position of each piston by marking. For example,
mark "1" on the No. 1 piston.
• Place the piston rings with their gaps at 0.785 rad (45°) from
the piston pin's direction as shown in the figure.
• Carefully insert the pistons using a piston ring compressor
(1).
• When inserting the piston in place, be careful not to get the
molybdenum disulfide coating torn off its skirt. This coating
is useful in minimizing the clearance with the cylinder liner.
Just after the piston pin has been press-fitted, in particular,
the piston is still hot and the coating is easy to peel off. Wait
until the piston cools down.
Tightening torque
(1) Piston Ring Compressor
(A) Top Ring Gap
(B) Second Ring Gap
1-S41
44.1 to 49.0 N·m
Connecting rod screw 4.5 to 5.0 kgf·m
32.5 to 36.2 ft-lbs
(C) Oil Ring Gap
(D) Piston Pin Hole
(a) 0.79 rad (45°)
ENGINE
W10277450
KiSC issued 07, 2007 A