Yanmar 1GM, Руководство по эксплуатации

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3-f)-2. The fuel may be bad;
Important
For the disassembly, adjustment and inspection of the fuel injection pump
and fuel injection valve, consult the nearest Yanmar dealer.
Note
It is convenient to check simultaneously the
exhaust/intake value clearance when removing the
starter motor.
4) Washing and replacement of the fuel filter element.
Remove the lower cover of the fuel filter and wash or
replace the element.
1. Fuel Filter
The proper method to remove the element is shown in the figure
below. When you start the new engine for the first time or after long
storage, clean the filter element after 50 hours of operation. After
that replace the element every 250 hours of operation.
2. Air breathing bolt
3. Filter element
4. Filter bowl
5. Tightening screws