Forward seal tank level changes
Kobelco Compact Seal CX-500, oil-lubricated stern tube seals (aft and forward)
Possible cause
No.4 or No.5 ring damage
What to do
Manufacturer's manual, p. 31Recover or refill oil, contact maker
See the assembly on the 3D model
Other Kobelco Compact Seal CX-500 faults
Stern tube oil above 60 °CBearing damage, cooler or thermometer faultSudden drop of stern tube oil levelLeak from aft or forward sealEmulsified oil or seawater in drainDamaged No.1/No.2 rings or trapped foreign matterFresh water in drainLeak from aft peak tank
From the manufacturer's manual “EM-35 KOBELCO COMPACT SEAL-STERNTUBE SEALING”. Check against the original on board before work.