几年来,我们在大修EQ240型越野汽车发动机时,常常需要更换活塞,而当时又没有购到这种活塞,为了抓革命、促生产,及时修好这种发动机,我们经多次试验研究,找到了该机活塞的代用办法。即用解放牌CA—10型发动机活塞代替EQ240汽车发动机的活塞。EQ240型汽车发动机活塞直径为100毫米,而CA—10型汽车发动机活塞直径为101.60毫米,因此代用时,须先将EQ240型汽车发动机缸套搪大,保证缸套与代用活塞的配合间隙在0.08～0.10毫米的范围内,不可过大,也不可过小,因为活塞与缸套的配合间隙太大时, In recent years, when overhauling EQ240 off-road vehicle engine, we often need to replace the piston, but did not purchase this kind of piston at that time. In order to grasp the revolution, promote production and fix the engine in time, we have conducted many experiments and found The machine piston alternative. That is, with the liberation of the CA-10 engine piston piston instead of EQ240 car engine. EQ240 car engine piston diameter of 100 mm, while the CA-10 car engine piston diameter of 101.60 mm, so the alternative, the EQ240 car engine cylinder liner enlarging, to ensure that the liner and the piston with the gap in the 0.08 ~ 0.10 mm range, not too large, nor too small, because the piston and cylinder liner with the gap is too large,