Yuchai YC6A Series, Operation & Maintenance Manual, Page: 92 / 99

92
damaged, so the rotating part
bumps with the housing.
⑦
气门间隙过大，在气缸盖处有较
大响声
The valve clearance is too big;
there is bigger sound at the
cylinder head.
调整气门间隙。
Adjust the valve clearance.
⑧
增 压 器 喘 振
Turbocharger
surging
清除压气机通道、废气通道的积碳及污物，运行海拔过
高。
Remove the carbon deposit and dirt in the
passage air compressor and exhaust gas path;
operate at too high elevation
5.4 排气冒黑烟
Black Smoke from Exhaust Manifold
故 障 原 因
Cause
排 除 方 法
Solution
①
进气堵塞
Air intake blocked
检查空气滤清器、进气管路并清理。
Check and
clean the air filter and air intake pipe.
②
燃油质量差
Poor quality of fuel.
换用规定的燃油。
Replace the fuel as specified.
③
喷油器雾化不良
Poor atomization
of fuel injector
检查，修复或更换。
Check, repair or replace.
④
增压系统压力不足
Inadequate pressure of
Turbocharged system
检查并排除管路和连接处的泄漏。
Check and eliminate the leak of pipes and
connectors
⑤
增压器工作失常
Abnormal working of Turbocharger
检查更换总成。
Check and replace the assembly
⑥ 中 冷 器 损 坏 、 漏 气
Intercooler
damaged and air leak
修补或更换。
Repair or replace
5.5 排气冒白烟、蓝烟
White smoke and Blue Smoke from Exhaust Manifold
故 障 原 因
Cause
排 除 方 法
Solution