Nanni N4.40 Workshop Manual page 140

03-M-E3B, 03-M-DI-E3B, 03-M-E3BG, WSM
Crankshaft
NOTE
• Before you disassemble, measure the side clearance of
crankshaft. Measure it when you assemble again.
[D1503-M, D1703-M,
V2003-M-BG, V2003-M-T-BG, V2203-M-BG]
1. Remove the screw 2 (1) of the main bearing case.
2. Pull out the crankshaft assembly not to give a damage to the
crankshaft bearing 1 (3).
[D1803-M, D1803-M-DI]
1. Remove the screw 2 (1) of the main bearing case.
2. Turn the crankshaft to set the crankpin of the third cylinder to the
bottom dead center.
3. Pull out the crankshaft until the crankpin of the second cylinder
comes to the center of the third cylinder.
4. Turn the crankshaft by 2.09 rad (120 °) counterclockwise to set
the crankpin of the second cylinder to the bottom dead center.
5. Pull out the crankshaft until the crankpin of the first cylinder
comes to the center of the third cylinder.
6. Do the above steps again to pull out the crankshaft completely.
[V2403-M, V2403-M-DI, V2403-M-T, V2403-M-DI-T, V2403-M-BG]
1. Remove the screw 2 (1) of the main bearing case.
2. Turn the crankshaft to set the crankpin of the fourth cylinder to
the horizontal directions (right or left).
3. Hold the crankpins to the horizontal directions (right or left) and
pull out the crankshaft completely.
(When reassembling)
IMPORTANT
• When you install the crankshaft assembly, align the screw
hole of the main bearing case 2 (2) with the screw hole of
the cylinder block.
• Apply oil to the screw 2 (1) of the main bearing case and
tighten the screw by hand.
If you cannot turn the screw 2 smoothly, align the screw
holes between the cylinder block and the main bearing
case correctly.
Then tighten the screw 2 to the specified tightening torque
with a torque wrench.
Screw 2 of main bearing
Tightening torque
case
(1) Screw 2 of Main Bearing Case
(2) Main Bearing Case 2
(3) Crankshaft Bearing 1
1-S70
V2003-M, V2203-M,
69 to 73 N·m
7.0 to 7.5 kgf·m
51 to 54 lbf·ft
(a) Cut place to remove and install
the crankshaft
[A] D1803-M, D1803-M-DI
M00000003ENS0101US1
ENGINE
D1703-M-BG,
KiSC issued 06, 2009 A