Connecting rod bearing ring, common disease!

1 fault phenomenon launched machine idle running noise is loud or when small, sharp acceleration are heavier and shortness of 'dangdang' obvious continuous tapping. This is the main characteristic of connecting rod bearing ring, serious when idle noise can hear clearly. Connecting rod bearing than main bearing rings for joy, ease, urgent. 2 problem analysis (1) connecting rod bearing or journal wear and make the fit clearance is too large or bad. (2) low oil pressure, oil change, or connecting rod shaft oil duct infarction, smooth and bad. (3) connecting rod bearing cap is loose or broken. (4) connecting rod bearing size discrepancy, provoked the rotation or rupture. (5) antifriction alloy connecting rod bearing is shattered or burned. 3 fault diagnosis (1) change a machine speed, idle when the noise is small, evident when medium speed, a steady increase the chiming of the throttle has a continuous, sharp acceleration when tapping increase, when high speed is not obvious because of other noise around. (2) the load increase, noise. (3) a machine the temperature change, the noise usually remains unchanged, but sometimes also affected by smooth oil temperature. (4) single cylinder is broken fire, noise significantly weakened or lost, but noise can immediately namely again when after the fire on the cylinder. But when connecting rod bearing loose kuang nothing, simplex fire ring has no obvious change. (5) the ignition, hair ring 2 times, namely each work cycle ring twice. 6. Connecting rod bearing noise in larger on the side of the oil sump. If use the stethoscope to touch on the body, the noise is not very clear, but in oil mouth or crankcase ventilation tube mouth direct listening, can hear clearly tapping connecting rod bearing. 7) along with the phenomenon. Connecting rod bearing ring along with a significantly lower oil pressure phenomenon, serious opportunity body fluttering, this is different from the piston pin, piston type cylinder. Usable hand with a screwdriver or stethoscope against the lower cylinder body or the oil pan, try when touch the corresponding fault cylinder there is obvious vibration sense.