Assembling The Crankshaft; Assembling The Piston And Connecting Rod Assembly - Yamaha 55DEHD Service Manual

Assembling the crankshaft

1. Install a new ball bearing 1 into the
crankshaft using a press, then install the
circlip.
cC
Do not reuse the ball bearing, always
replace it with a new one.
Support 2:
90890-02394
Bearing pressure C 3:
90890-02393
2. Install the main bearings 4 and circlips
5 onto the crankshaft journal.
5
4
5
4
6885J11
3
1
2
68850510
68850520
Assembling the piston and connect-
ing rod assembly
1. Assemble the pistons 1, connecting rods
2, needle bearings 3, washers 4, pis-
ton pins 5, and new piston pin clips 6.
7
4
2
3
1
a
4
6
NOTE:
9 Face the embossed "YAMAHA" mark a on
the connecting rod in the same direction as
the "UP" mark b on the piston.
9 Install the set with the identification mark in
the direction indicated in the removal proce-
dure.
9 Use the special service tool 7 to install the
needle bearings.
9 Always use new piston pin clips.
9 Be sure to align the piston pin clip end with
the piston pin slot c.
Small end bearing installer 7:
90890-06527
2. Install the 2nd piston ring 8 and top pis-
ton ring 9 onto the pistons.
Crankcase
1
2
c
6
6
3
5
b
4
68850530
5
6
7
8
9
9
8
68850540
5-30