Installation Of Piston And Connecting Rod - TOHATSU MFS 4D Service Manual

4 stroke
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Power Unit
37) Installation of Piston and
Connecting Rod
Install connecting rod 2, piston pin 3, and piston pin
1.
clip 4 to piston 1.
· Point "3AB-UP" mark a of connecting rod and
"UP" mark b of piston to the same direction.
· Be sure to use new piston pin clip, and place
clip gap away from piston pin groove c as
shown.
· Be sure to install the connecting rod cap in
original position (direction).
4st OIL
4st
Put expander 5 (#4) in the oil ring groove, and check that
2.
ring end makes gap as shown.
While holding expander 5 (#4) gap with thumb, put upper
3.
side rail (#3) into the groove so that the gap is away from
gap of expander 5 (#4) to the left by 90 degrees.
4.
In similar way, put lower side rail (#5) into the groove so that
the gap is away from gap of expander 5 (#4) to the right by
90 degrees.
5.
Install second ring (#2 taper) and top ring (#1) to piston.
Install top Ring (#1) and Second Ring (#2) so that their side
with manufacturer's identification d (T) faces upward (valve
side).
6.
Bring their gaps are away from each other as shown.
Be careful not to scratch piston surface
and damage rings.
· Install piston rings so that their gaps are away
also from thrust direction of piston and
direction piston pin.
· After installing piston rings, check that they
move smoothly.
5-44
CAUTION
4
3
2
a
4
4
Do not reuse.
d
#5
#4
#3
5
b
U P
1
4st
4st OIL
c
5
5
45°
45°
#2
#3
#4
UP
5
#5
#1
#2
d
#1
4st 4/5/6 2020

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