ENGINE
BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM
1-S37
(5) Piston and Connecting Rod
Connecting Rod
1. Remove the connecting rod cap.
(When reassembling)
• Align the marks (a) with each other. (Face the marks toward the
injection pump.)
• Apply engine oil to the connecting rod screws and lightly screw
it in by hand, then tighten it to the specified torque.
If the connecting rod screw won't be screwed in smoothly, clean
the threads.
If the connecting rod screw is still hard to screw in, replace it.
[BX1870D (D722-E4) and BX2370D (D902-E4)]
[BX2670D (D1005-E4)]
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Pistons
1. Turn the flywheel and bring the piston to top dead center.
2. Draw out the piston upward by lightly tapping it from the bottom
of the crankcase with the grip of a hammer.
3. Draw out the other piston in the same method as above.
(When reassembling)
• Before inserting the 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.
• 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.
• When installing the piston into the cylinder, place the gaps
of all the piston rings as shown in the figure.
• Carefully insert the pistons using a piston ring compressor
(1). Otherwise, their chrome-plated section may be
scratched, causing trouble inside the cylinder.
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Tightening torque Connecting rod screw
27 to 30 N·m
2.7 to 3.1 kgf·m
20 to 22 lbf·ft
Tightening torque Connecting rod screw
42 to 46 N·m
4.2 to 4.7 kgf·m
31 to 33 lbf·ft
(a) Mark
(1) Piston Ring Compressor (A) Top Ring Gap
(B) Second Ring Gap
(C) Oil Ring Gap
(D) Piston Pin Hole
(a) 0.79 rad (45 °)
(b) 0.79 rad (45 °)
(c) 1.6 rad (90 °)
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