Adjustment of axial clearance of camshaft of biogas generator set. When the camshaft works, it needs to leave a certain axial clearance due to thermal expansion. But if the clearance is too large, more than 2.5mm, it will cause the axial movement of camshaft and aggravate the wear of parts. Moreover, due to the change of camshaft position, it will cause the change of gas distribution phase and affect the normal work of Shandong biogas generator set. Therefore, the camshaft should be positioned axially.

發電機工作時，由於零件的磨損與鬆動，或者正時齒輪室蓋經過拆裝後，均需調整凸輪軸的向間隙，以保證凸輪軸正常工作。發電機凸輪軸的軸向定位，是用齒輪室蓋上的止推螺釘實現的。調整時，需將止推累釘擰到底，消除軸向間隙，然後再退回約1/4圈即可。

When the generator is working, due to the wear and looseness of parts, or after the timing gear housing cover is disassembled, the clearance of camshaft should be adjusted to ensure the normal operation of camshaft. The axial positioning of the generator camshaft is realized by the thrust screw on the gear housing cover. When adjusting, screw the thrust pin to the end to eliminate the axial clearance, and then return about 1 / 4 turn.

不能將發電機曲軸箱的通氣孔堵死。發電機工作過程中，每當活塞下行時，曲軸箱內的氣體（包括泄漏來的燃氣）受壓縮，使箱內氣體壓力升高，造成油底殼結合麵處機油向外滲漏，並對活塞運動產生阻力。因此，發電機曲軸箱應有通大氣的通氣孔。

Do not block the vent hole of the generator crankcase. During the working process of the generator, whenever the piston goes down, the gas (including the leaked gas) in the crankcase is compressed, which increases the gas pressure in the crankcase, causes the oil leakage at the joint surface of the oil pan, and produces resistance to the piston movement. Therefore, the generator crankcase should have air vent.

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Biogas Generator Set 

不同型號的發電機，曲軸箱上通氣孔的位置不一樣，但其工作原理相同，即單向閥作用原理。當活塞由止點向下止點移動時，曲軸箱氣壓增高將閥打開，使氣體排出；當活塞由下止點向上止點移動時，曲軸箱氣壓隨著空間變大而降為負壓。

Different types of generator, the position of the crankcase vent is not the same, but its working principle is the same, that is, the principle of one-way valve. When the piston moves from dead center to down dead center, the increase of crankcase air pressure will open the valve and exhaust the gas; When the piston moves from the bottom dead center to the top dead center, the crankcase air pressure decreases to negative pressure as the space increases.

負壓使閥堵住曲軸箱與外界的通道，阻止外界的灰塵進入曲軸箱，保持潤滑油的清潔，並使發電機工作時潤滑油向外滲泄的機會減少。因此，發電機曲軸箱的通氣孔應保持暢通，保證曲軸箱對外呼氣。

The negative pressure makes the valve block the passage between the crankcase and the outside, prevents the outside dust from entering the crankcase, keeps the lubricating oil clean, and reduces the chance of lubricating oil leakage when the generator is working. Therefore, the ventilation hole of the generator crankcase should be kept unblocked to ensure that the crankcase exhales.

曲軸燒蝕，主要由曲軸軸頸與軸瓦間未能形成有用潤滑油膜，使得曲軸軸頸與軸瓦直接摩擦所致。當發電機發生曲軸燒蝕時，會冒白煙，發出金屬撞擊異響聲，甚至會造成曲軸與軸瓦抱死在一起而無法轉動。因此，必須對其故障產生的原因進行正確地分析與判斷。

The crankshaft ablation is mainly caused by the failure to form a useful lubricating oil film between the crankshaft journal and the bearing bush, which causes the direct friction between the crankshaft journal and the bearing bush. When the generator crankshaft is ablated, it will emit white smoke, make metal impact noise, and even cause the crankshaft and bearing bush to lock together and cannot rotate. Therefore, it is necessary to correctly analyze and judge the causes of the fault.