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Promaxin
08-17-2023, 12:17 AM
3L optimax compressor rebuild

Just purchased a 250 opti with the “updated” compressor. Compressor appeared to be gone and pulled it down to assess. The bearings are fine, the bore is scratched not badly but enough for a machinist to say it probably needs to go slightly oversized.

Does anyone know what piston the 3L optimax compressors use? Or alternatively what sleeve is used? Can buy stock size piston/rings off eBay, so that would also work new sleeve with standard piston.

These compressors are hard to come by these days, just seeing if there is an alternative to buying a new compressor they are hard to come by.

thank you

4Speed
08-17-2023, 07:44 AM
I would put the motor year and serial number in your question as that will help the S&F Mercury gurus provide you the information.

4Speed
08-17-2023, 07:57 AM
The below are from my 2010 3.0L Optimax 225 HP Sport XS Mercury

523315
523316

Promaxin
08-17-2023, 04:27 PM
The below are from my 2010 3.0L Optimax 225 HP Sport XS Mercury

523315
523316

thanks 4speed, Mercury don’t sell the piston/rings seperately for these compressors guessing they want you to buy a complete unit. The compressor I have apart is 8M006133

FUJIMO
08-17-2023, 06:21 PM
thanks 4speed, Mercury don’t sell the piston/rings seperately for these compressors guessing they want you to buy a complete unit. The compressor I have apart is 8M006133
...sure about that part number? maybe its an 0081633...

kellytheaker
08-17-2023, 09:47 PM
I believe you just buy a complete unit

Promaxin
08-18-2023, 03:39 AM
...sure about that part number? maybe its an 0081633...
Checked again part number is 8M0081633

NICE PAIR
08-18-2023, 08:05 AM
Checked again part number is 8M0081633

You might have to look @ used.

https://www.ebay.com/p/26026924430


Here is an option: https://www.iboats.com/shop/ib1239705-1.html

Promaxin
08-21-2023, 04:11 PM
Thanks everyone for your help, ended up finding a company that sell a rebuild kit with piston/rings but the sleeve on mine is damaged so won’t work. Had a look at getting the sleeve replaced but it looks like a fair bit of work due to the design, so will go ahead and buy a replacement.