Main engine troubleshooting - No combustion in a single cylinder unit on an MC-C MAN M/E

Any further ideas to below??

After decreasing ME rpm from 104 to 100, slowdown alarm of exhaust gas temperature deviation at No6 cylinder occurred. From that time, the exhaust gas temperature of No6 is 50degC and no combustion takes place.

Actions taken:

  • Puncture valve replaced with new → no success

  • Suction valve replaced with new → no success

  • Fuel valves replaced with new → no success

  • Fuel pump barrel replaced with new → no success

  • Fuel pump cover replaced with new → no success

  • High pressure pipe replaced with new → no success

  • Fuel pump return line checked and found normal

  • Fuel pump timing checked and found normal

  • Fuel pump roller checked and found normal

  • Fuel pump roller gear checked and found normal

  • Exhaust valve opened and condition is ok

  • Scavenge space inspected and found ok, with no traces of fuel. Only unburnt cylinder oil.

  • Fuel pump complete transferred from No6 to No1 cylinder and cylinder no1 was working normally meaning the problem was not transferred and remains at No6

1 Like

It seems that you have done a pretty extensive troubleshooting.
I recall a similar case as well.
I would also propose to check the following:

  • Position of fuel pump rack in unit No6. Differences between other cylinder units?
  • VIT
  • Non return valves on the fuel oil return line in unit No6
  • Correct tightening torque and collar / nut distances of high pressure fuel oil pipes from fuel pump to injection valves in unit No6
1 Like

Finally the issue was clogging of ball valve at inlet of fuel pump !!

3 Likes