Crankcase And Crankshaft; Exhaust Cover - TOHATSU NB-1000 Service Manual

Exhaust Cover

6. Remove the exhaust cover bolts. Insert screwdrivers
8 9
into pinch grooves to separate and remove outer and
inner exhaust covers.

Crankcase and Crankshaft

7. Remove and discard oil seal (1) and o-ring (2) from lower
10
crankcase head (or engine base or lower cowl). Use a seal
puller to prevent damage to the head.
8. Remove the crankcase bolts and separate the crankcase
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from the cylinder block.
Start with the bolts farthest from the center of the
crankcase and work inwald.
9. Tap the tapered portion of the crankshaft (3) with a
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rubber mallet to loosen it. Lift the crankshaft and
pistons from the cylinder block and place on bench for
disassembly.
10. Slide the upper main bearing off the crankshaft. Remove
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and discard bearing oil seal (4) and o-ring (5).
The 25/30 crankshaft has a bearing race which
blocks removal of the bottom piston. Lift up and
remove race to remove the crankshaft assembly.
1-/ 2-Cylinder
T1680
NOTE
NOTE
POWERHEAD
10
T1592
T1682
T2203
T1683
T1684
T1685
4-27