School me on I/Os

[abl1111]

The i/o performs awesome ! Better than any other option IMO. The responsiveness is excellent.

However, the maintenance, even if cared for very well is a factor as compared to an OB and many of the bolt-on marinization parts die after time. I installed mine new in 2003. I keep my 300 HP, 5.7L 350 Mercruiser ( freshwater cooled - except the risers ) in the brine for 6 months. I am VERY meticulous and care for the engine and drive to reduce premature part failure ( so, a lot of preventive maintenance ). Parts are stupid expensive..

Some of the things I would check carefully as they cost $$$:

NOTE: My gimbal ring wore so when removing the motor to repair, I had anything marginal replaced including the oil pan, starter and coupler which was fine, but was an aluminum version - the metal version is superior so to avoid issues, I replaced mine with that ( 800 hours )

- Oil pan - I replaced mine at 800 hours ( looked OK but rust near drain, mechanic said do it... )
- Gimbal ring - engine come out - and usually replace the whole transom mount - very $$$$$ part Check to see if the drive moves side to side when the steering wheel is held. If it does - thats a concern !
- Risers - R/R at 400 hours - If you have raw water cooled - think risers and manifold replacement unless recently done
- Cooler ( fresh water meets salt ) - pricey part R/R @ 300 hours - only if freshwater cooled
- Fuel Injection Pump / Cooler - expensive and bitchy spot R/R @ 300 hours
- Bellows ( drive and exhaust )- R/R @ 450 hours - labor intensive, $ if not done already
- various sensors.
- raw water pump - not just the impeller, but the housing wears...

Each season, it is important to properly prep and paint the transom mount / gimbal etc to maximize its life. Check for corrosion - it means it wasn't taken care of properly, or 'zincs' weren't changed often enough.

The Drive ( Bravo 3 ) - is bullet proof so far. Change seals and oil each season - I sand and prep mine each year with Trilux and it looks mint.

Hope this helps. I hope the boat was well taken care of ...

I'd prefer an OB for simplicity and ease, but my boat was a twin IO and when I restored her, I opted for a single V8. I am very happy with her, but again, a properly bracketed 300 OB would be nice too !