Disassembly and Assembly WM 80 Repair
130 wc_tx000523gb.fm
10.20 Assembling Crankcase
See Graphic: wc_gr002912
This procedure requires a propane torch or equivalent heat source.
10.20.1 Lubricate the shaft seals (a) using 2-cycle engine oil. Position one of
the seals over the bore in the crankcase shell (b) with the open side of
the seal facing in. Make sure the seal is laying straight and press it into
the bore, from the outer side, using pusher P/N 0048585. Press until
the outer edge of the seal is flush with the outer edge of the crankcase
shell. In the same manner, press the other shaft seal into the other
crankcase shell (c).
10.20.2 Lubricate both crankshaft bearings with 2-cycle engine oil.
10.20.3 Heat the area
(d) of the crankcase shell (b) using a propane torch. Heat
the area to approximately 70°– 80°C (150°–175°F). Be careful not to
damage the seal when heating. Install the crankshaft into the warm
crankcase shell.
Note: The crankshaft should slide easily into the crankcase shell if
heated sufficiently.
10.20.4 Lightly oil gasket
(e) with 2-cycle engine oil. Position the gasket over
the roll pins (f) in crankcase shell (c).
10.20.5 Heat crankcase shell (c) using a propane torch (In the same manner
as crankcase shell (b) in step 3.) Heat the area to approximately 70°–
80°C (150°–175°F). Be careful not to damage the seal when heating.
Install the crankshaft into the warm crankcase shell and push the
crankcase shells together until they are tight.
10.20.6 Allow the preassembled crankcase to cool. When cool, secure it
together with M5 screws (g) and nuts (h). Tighten the screws in steps
and torque to 6.5 Nm (5 ft.lbs.).
10.20.7 After the crankcase is assembled, tap it lightly on the end to release
any bearing tension. Check the assembly by turning the crankshaft by
hand. The crankshaft should turn easily.
10.20.8 Trim off any excess gasket material from the outside of the engine and
at the top of the cylinder mounting surface.
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