TOHATSU NB-1000 Service Manual page 111

If any dimension is not within specification, replace the crankshaft
assembly.
Model
2.5 / 3.5
5
8 / 9.8
9.9 / 15 / 18
25 / 30
40
6. Check for smooth operation of aIl crankshaft and
27
connecting rod bearings. Upper and lower main bearings
and small end connecting rod bearings are serviceable. Wear of
other parts requires replacement of the crankshaft assembly. lf
lower main bearing (2) is defective, proceed to remove the
components as follows:
• Remove snap ring (3).
• Install a universal bearing puller with bearing retainer plate and
remove lower main bearing (2) from the crankshaft.
• See powerhead Assembly procedure for installation.
DO NOT fully disassemble the crankshaft assembly
unless further wear or damage is suspect.
1-/ 2-Cylinder
Dimension 1
in [mm]
1.417 ± 0.002
[36 ± 0.05]
1.975 ± 0.002
[40 ± 0.05]
1.654 ± 0.002
[42 ± 0.05]
1.890 ± 0.004
[48 ± 0.1]
+ 0
2.047
– 0.001
+ 0
[52 ]
– 0.02
+ 0
2.071
– 0.002
+ 0
[52.6 ]
– 0.05
NOTE
POWERHEAD
Dimension 2
in [mm]
N/A
N/A
0.984 ± 0.002
[25 ± 0.05]
1.299 ± 0.002
[33 ± 0.05]
1.496 ± 0.002
[38 ± 0.05]
1.591 ± 0.002
[40.4 ± 0.05]
Dimension 3
in [mm]
N/A
N/A
4.292
[109]
5.079
[129]
5.590
[142]
5.733
[145.6]
T2026
4-31