Outboard-how much Carbon is “too much”

ThorSen

Active Member
Aug 17, 2017
219
Western North Carolina
Boat Info
2018 SPX 190 OUTBOARD 150
Engines
150 4-stroke Mercury outboard
Good evening, CSR braintrust!

I am wondering if two observances I made today are normal or, indicative of something else I should attend to (what I haven’t a clue, thus this query).

First is the amount of carbon I came across. Photos 1 & 4

I took the attached pictures as I removed the Black Max prop on our 2018 DPX 190 w Mercury 150hp 4-stroke (motor has under 50 hours on it with occasional pulling an inflatable towable behind it (never more than 2 kids or 1 adult and 1 smaller kid. We changed the lower gear lube and engine oil and filter last Fall).

Second are Photos 2 & 3. That is, the ring of wear I came across at the furthest in or base of the prop shaft - not sure if that is anything that indicates something needs to be corrected or not?

(All’s I have to go on is past experience with a manual trans in a ‘73 Challenger - it has a 440Mag dropped in it out of a donor ‘70 GTX and I learned that ANY - even the slightest - wear on the front end of that shaft spelled certain trouble, down the line. But, I realize there is a likelihood that does not translate directly over to Marine craft prop shafts. Or, does it? :)

Thanks in advance for any experience / guidance you can share (this is our first boat and we are trying to do right by her!
58285980-D124-4BE4-AE59-00FE4E3D1974.jpeg
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77607C69-B807-41A3-98EF-0D6C7ABE40F4.jpeg
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