| 摘要 |
The apparatus includes an engine having an engine housing (22), crankshaft (38), a piston (42), and an oil reservoir (50), an engine starting mechanism (18) configured to engage the crankshaft (38) and piston (42), a check valve (54a) configured to prevent pressure in a crankcase (46) from escaping and configured to allow filtered air into the engine, and a selector valve (34) configured to open a flow path between the check valve (54a) and a vent so oil can be drained.
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