由于瓦斯发电机组内有多处采用压力密封的形式，这种密封一般在发动机有约1/3负荷时，才充分发挥作用，而负荷小时便有可能出现轻微的渗漏现象，因此不少制造商普遍给予强调。若发电机组在小负荷下运行，随着运行时间的延续，会出现以下故障:

As pressure seals are used in many parts of the gas generator set, this kind of seal can only fully play its role when the engine has about 1 / 3 load, and slight leakage may occur when the load is small, so many manufacturers generally emphasize it. If the generator unit operates under small load, the following faults will occur with the extension of operation time:

1、活塞—汽缸套密封不好,机油上窜,进入燃烧室燃烧，排气冒蓝烟。

1. The piston cylinder liner is not well sealed, and the engine oil escapes and enters the combustion chamber for combustion, and the exhaust gas emits blue smoke.

2、对于增压式瓦斯机,由于低载、空载,增压压力低，容易导致增压器油封(非接触式)的密封效果下降,机油窜入增压室,随同进气进入汽缸。

2. For the supercharged gas machine, due to low load, no-load and low supercharging pressure, the sealing effect of the supercharger oil seal (non-contact type) is likely to be reduced, and the oil will flow into the supercharging chamber and enter the cylinder with the intake air.

3、上窜至汽缸的一部分机油参与燃烧,一部分机油不能完全燃烧，容易形成积炭，还有一部分则随排气排出。这样，汽缸套排气道内就会逐步积聚机油,也会形成积炭。

3. Part of the engine oil flowing up to the cylinder is involved in combustion, part of the engine oil can not be completely combusted, which is easy to form carbon deposits, and another part is discharged with the exhaust gas. In this way, the engine oil will gradually accumulate in the exhaust passage of the cylinder liner, and carbon will also form.

4、增压器的增压室内机油积聚到一定程度,就会从增压器的结合面处渗漏出。

4. When the oil in the supercharging chamber of the supercharger accumulates to a certain extent, it will leak from the joint surface of the supercharger.

5、瓦斯发电机组进行长期小负荷运行，将会更严重的导致运动部件磨损加剧，发动机燃烧环境恶化等导致大修期提前的后果。

5. The long-term small load operation of the gas generator set will lead to more serious wear of the moving parts, deterioration of the combustion environment of the engine and other consequences leading to the early overhaul period.

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