Piston And Connecting Rod - wsm wg972-e4 Workshop Manual

WG972-E4, WSM

(6) Piston and Connecting Rod

Connecting Rod Cap
1. Remove the connecting rod caps (1) using a hexagonal 7 mm
socket.
(When reassembling)
• Align the marks (a) with each other. (Face the marks toward the
intake manifold.)
• 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.
Tightening torque Connecting rod screw
(1) Connecting Rod Cap
Piston
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 pistons after 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 fuel camshaft.
• When inserting the piston into the cylinder, place the gap "C" of
the top compression ring on the opposite side of the slant
portion, and stagger the gaps "A", "E" of the second
compression ring and spacer making 2.09 rad (120 °) from the
gap of the top compression ring. Further, stagger the gaps "D",
"B" of the upper and lower side rail making 1.6 rad (90 °) from
the gap of the spacer.
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.
• When installing the piston into the cylinder, place the gaps
of all of the piston rings as shown in the figure.
• Carefully insert the piston using a piston ring compressor
(1). Otherwise, their chrome-plated section may be
scratched, causing trouble inside the cylinder.
(1) Piston Ring Compressor
A: Second Compression Ring Gap
B: Side Rail Gap
C: Top Compression Ring Gap
1-S33
ENGINE
27 to 30 N·m
2.7 to 3.1 kgf·m
20 to 22 lbf·ft
(a) Mark
9Y1211108ENS0053US0
D: Side Rail Gap
E: Spacer Gap
(a) 2.09 rad (120 °)
(b) 1.6 rad (90 °)
9Y1211108ENS0054US0
KiSC issued 07, 2015 A