為了查明氣缸壓縮力不足是否是因活塞環不良而造成的，可在氣缸中加入一些乾淨的良好機油。如機油加入後，氣缸壓縮力顯著增強，則表明活塞環不良，氣體是經過活塞與氣缸壁之間的縫隙而漏入油底殼的。
To find out if the lack of cylinder compression is caused by a bad piston ring, add some clean, good oil to the cylinder. If the oil is added, the cylinder compression force is significantly increased, which indicates that the piston ring is not good, the gas is leaking into the oil sump through the gap between the piston and the cylinder wall.
如果加入機油後，氣缸壓縮力仍無明顯的變化，則表明氣缸壓縮力不足與活塞環無關，而可能是氣體經過進氣門或排氣門時漏掉的。
If there is no significant change in cylinder compression force after adding oil, it indicates that the lack of cylinder compression force has nothing to do with the piston ring, but may be the gas leaking through the intake or exhaust valve.
不良的活塞環可能與其磨損或與活塞環槽焦結後造成的漏氣情況有關。此時機器在使用過程中外部的徵象，是經過活塞環漏入氣缸體內的廢氣大量地從通氣口(或加油口)處冒出來。在這種情況下可用斷缸法依次使某一缸不工作進行判斷。如果切斷某一缸後，廢氣不再從加機油處或通氣口冒出，則說明此年活塞使用情況不良。
Bad piston rings may be associated with wear or air leakage caused by scorching of the piston ring grooves. The external sign of the machine in use is that the exhaust gas leaking through the piston rings into the cylinder body is coming out in large quantities through the air vent (or refuelling port). In this case, the cylinder cut-off method can be used to make a cylinder not work in order to judge. If after cutting off a cylinder, the exhaust gas no longer comes out from the oiling place or vent, it means that the piston is not in good condition this year.
活塞環漏氣的原因:
Piston ring leakage of causes:
1.活塞環槽磨損。活賽現槽磨損主要在環槽的下韋面，造成磨損的原肉是氣環的下衝擊和活塞環在環槽內的徑向滑動，使第二密封面的密封效果下降
1. piston ring groove wear. The piston ring groove wear is mainly in the ring groove of the lower Wei surface, causing wear of the original meat is the impact of the gas ring and the piston ring in the ring groove of the radial sliding, so that the second sealing surface of the sealing effect is reduced
2.活塞環磨損。由於活塞環的材質與氣缸壁不配套(兩者的硬度相差太大)，使環磨損t後其密封住變差
2. Piston ring wear. Due to the piston ring material and cylinder wall mismatch (the difference between the hardness of the two is too large), so that the ring wear t after the seal becomes poor
3.活塞環開口間隙過大或鏗摻時不合要求，面環的封氣效果變壞，節流作用降低，漏氣通道加大開口間隙二般柴油發動機比汽油發動機大，而且第一道環比二、三道環大。
3. piston ring opening gap is too large or dangling does not meet the requirements, the face of the ring sealing effect becomes bad, the role of reduced throttling, leakage channel to increase the opening gap two general diesel engines than gasoline engines, and the first ring than two, three ring large.
4.活塞環開口分佈不合理。為了減少漏氣，加強環開口處的節流作用，使環的封氣路線長，故各道氣環的開國虛按要求操作。
4. piston ring opening distribution is not reasonable. In order to reduce air leakage, strengthen the ring opening at the throttling effect, so that the ring seal air path line long, so the open country of each gas ring false according to the requirements of the operation.
5.發動機工作時，作用在環上的各種力相平衡鬥處於浮動狀態時，可引起環的徑向振動，使容封失效同時也可能出現環的圓周轉動，這將使安裝時的開口錯開度數發生變化，也會造成漏氣.
5. engine work, the role of the various forces on the ring phase balance fight in a floating state, can cause the ring radial vibration, so that the seal failure may also appear ring circumferential rotation, which will make the installation of the opening staggered degrees of change, will also cause air leakage.
6.活塞環斷裂、膠粘、卡死在環槽內，或活塞環裝反，均使環的第一密封面失去密封作用而漏氣。如扭曲壞和錐形環等沒按要求安裝在環槽內。
6. Piston ring fracture, glued, stuck in the ring groove, or piston ring installed in reverse, the first sealing surface of the ring to lose the sealing effect and leakage. Such as twisted bad and tapered ring is not installed in the ring groove as required.
7.氣缸壁磨損或有印痕、溝槽而影響氣環的第一密封面的密封而漏氣
7. Cylinder wall wear or marks, grooves and affect the first sealing surface of the air ring seal and air leakage
活塞環漏氣檢查
Piston ring leak inspection
1.逐個氣缸內(拆下火花塞或噴油器)力。人少量潤滑汩進行氣缸壓縮壓力的檢查，若加入潤滑油後，氣缸壓縮壓力升高，則證實是活塞環密封不嚴。
1. one by one in the cylinder (remove the spark plug or injector) force. People a small amount of lubrication gurgling cylinder compression pressure check, if added to the lubricant, cylinder compression pressure rise, it is confirmed that the piston ring seal is not tight.
2.選用氣環的硬度比氣缸硬度適當大些。使用軟活塞環會縮短環的使用壽話。環與氣缸的軟硬檢查，可用鏗JJ或刮力試刮氣缸下端緣和環進行比較。
2. choose the gas ring hardness than the cylinder hardness appropriate larger. The use of soft piston ring will shorten the life of the ring. Ring and cylinder soft and hard check, available clang JJ or scrape force test scrape cylinder lower end edge and ring for comparison.
3.正確堂握換環時機,應在氣缸磨損不厭重，環的彈力下降不明顯，發動機燃料和潤滑油均未出現具常時換環。若氣缸磨損在允許範圍內，而配缸間隙超大，就聲更換活塞否則僅換活塞環，"會因原來活塞在氣缸內擺動頻繁，無法控制噸塞環而再次發生故障。
3. Correctly hold the ring time, should be in the cylinder wear is not heavy, ring elasticity decline is not obvious, engine fuel and lubricant are not appear with often when the ring. If the cylinder wear in the permissible range, and with cylinder gap is very large, sound replacement piston otherwise only change piston ring, "will be due to the original piston in the cylinder swing frequently, can not control tons of piston ring and again occurrence of failure.
4.在換環時應用刮刀刮除”缸肩”，清除環槽內積炭，環的開口應以氣缸下部檢查為准。以防被”缸肩”撞斷，環被積炭卡在環槽內及因環開口隙不足而脹斷。
4. in the ring when the application of scraper scraping "cylinder shoulder", clear the ring groove carbon, the ring opening should be to the lower part of the cylinder check. In order to prevent the "cylinder shoulder" broken, the ring is carbon stuck in the ring groove and due to the ring opening gap is not enough to swell off.
5.在安裝活塞環前，應將活塞的整個環帶和銷孔部分浸人清潔的稀潤滑油中，預先潤滑，防止出現發動機起動後新活塞銷咬死及活塞環與環槽的千磨擦
5. In the installation of the piston ring before, should be the entire piston ring with and pin hole part of the dip in clean thin lubricating oil, pre-lubrication, to prevent the engine start after the new piston pin bite and piston ring and ring groove of a thousand friction
6.提高發動機維修品質，使環的開口端隙、邊隙、背隙等符合技術要求，開口錯開合理，加強環的漏光度檢驗，、避免將環安裝反o環端隙為直切口者，應在鏗修時鏗平整。
6. improve the quality of engine maintenance, so that the ring opening end gap, side gap, back gap, etc. in line with technical requirements, opening stagger reasonable, strengthen the ring leakage test, avoid installing the ring against o ring end gap for straight cut, should be in the clang repair clang flat.
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