由于瓦斯發電機組內有多處采用壓力密封的形式，這種密封一般在發動機有約1/3負荷時，才充分發揮作用，而負荷小時便有可能出現輕微的滲漏現象，因此不少制造商普遍給予強調。若發電機組在小負荷下運行，隨著運行時間的延續，會出現以下故障:

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,機油上竄,進入燃燒室燃燒，排氣冒藍煙。

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、對于增壓式瓦斯機,由于低載、空載,增壓壓力低，容易導致增壓器油封(非接觸式)的密封效果下降,機油竄入增壓室,隨同進氣進入汽缸。

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、上竄至汽缸的一部分機油參與燃燒,一部分機油不能完全燃燒，容易形成積炭，還有一部分則隨排氣排出。這樣，汽缸套排氣道內就會逐步積聚機油,也會形成積炭。

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、增壓器的增壓室內機油積聚到一定程度,就會從增壓器的結合面處滲漏出。

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、瓦斯發電機組進行長期小負荷運行，將會更嚴重的導致運動部件磨損加劇，發動機燃燒環境惡化等導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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