1. Fuel quality issues (containing water or impurities) can cause plunger wear, ultimately leading to a decrease in high-pressure fuel pump injection pressure.
Common symptoms include: 1. Difficulty starting when the engine is hot. 2. Black smoke and speed drop under engine load. 3. In severe cases, the fuel pump injection pressure is too low, resulting in pressure below 175 kg at the injectors, preventing atomization.
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Solutions: 1. If starting is difficult when the engine is hot (if plunger wear is not severe), the starting fuel injection quantity can be adjusted appropriately.
2. If starting is impossible (severe wear of the plunger or distributor shaft), the fuel pump head must be replaced.
3. For engine speed drop, in most cases, it is due to a decrease in fuel pump injection pressure, resulting in reduced fuel injection flow. It is best to have the fuel pump checked at a Yanmar FIE dealership. The standard injection quantity is 20-21. Specific adjustments are as follows: Adjust the starting fuel quantity.
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Full load/diesel limit bolt or torque spring. This bolt is sealed and must not be moved without authorization; otherwise, warranty will be voided. Adjustment will affect engine performance and emissions and can only be adjusted by a professional FIE repair shop according to the engine’s technical specifications.
Poor diesel fuel quality can cause damage to precision components.
