1986 75HP Mercury Outboard LU Metal Shavings

[Chief78]

While changing the Lower Unit oil, 1986 75 HP Mercury Outboard, I discovered a “marble size” glob of metal shavings. These were the size of a coarse sand and were also throughout the oil as it drained out. The last oil change was about 40 hrs (run time) ago. What does this indicate and how do I approach solving this problem?

 

[jimmbo]

I would say an inspection of the internals is needed. Likely a bad Bearing

 

[Chief78]

I would say an inspection of the internals is needed. Likely a bad Bearing

Thank you. How would I inspect for a bad bearing? That is, how would I know that a bearing is bad? And how do I get to it/them?

 

[roscoe]

Start with a factory service manual and then disassemble the lower unit and all internals.

 

[racerone]

Start shopping for a used lower unit ??