背景：

Main engine  6G70 ME-C 9.2, has experienced numerous slowdowns for more than one month. All slowdowns are due to the same reason “Illegal FIVA position”.

已經(jīng)采取過的措施：

• Main LO filter cleaned

• ME LO hydraulic  auto backwash filter (both Main and By-pass) cleaned.

• Use the Super Fine Filter for 2 hours.

• CCU FIVA   replaced as follows (currently installed):

• CCU1:      with new complete FIVA

• CCU2:      with reconditioned FIVA

• CCU3:      with new proportional valve only

• CCU4:      no changes

• CCU5:      with reconditioned FIVA. However, after departure slowdown occurred to      CCU5 (cannot be reset) and we changed the proportional valve with new. Now CCU5 has a new proportional valve.

• CCU6:      with reconditioned FIVA

出問題的幾個缸的HCU  Events 

第二缸

第三缸

第五缸

第六缸

其他發(fā)現(xiàn)：

- 蓄能器壓力都正常,，主機運行時間34000+小時

- 6u HPS 自清濾器反沖空氣漏泄

- 在不發(fā)生報警的時候Manual dump HCU Events 一切正常

- 系統(tǒng)液壓油化驗表明一切正常， 符合ISO4407 16/14 要求

- 么有電磁噪音報警

暫時的疑點：

- 第四缸是原配的裝機FIVA,， 沒有出問題,， 其它缸都是翻新過的,， 然后都有問題， 會出現(xiàn)在這個上面嗎,？

歡迎留言探討,。