Cutless Bearing Replacement: Boatyard or DIY?
The cutless bearing supports the prop shaft where it exits the boat. It's a wear item — typically 5–10 years in cruising use. When it's gone, you need to replace it. The question is whether to pay a yard, or to pull the shaft yourself.
What's involved
- Boat out of water (haul-out)
- Remove the prop
- Disconnect coupling at the engine end
- Slide shaft out of the strut/stern tube
- Press out old bearing
- Press in new bearing (with proper alignment)
- Reinstall shaft, coupling, prop
- Realign shaft to engine if necessary
The DIY case
- Materials cost: USD 80–200 for the bearing.
- If you do other yard work simultaneously, the haul-out is sunk cost.
- You learn the system and can diagnose future issues.
- Most production cruising boats are reasonable to do yourself with care.
The yard case
- Press tools and pulleys for shaft removal — yards have them.
- Realignment afterward — yards have the experience.
- Some shafts are corroded into the strut and need careful (or destructive) removal.
- Total cost USD 500–1,100 typical.
What cruisers actually choose
The split is roughly 50/50. DIY-inclined cruisers with their own tools and time go that route. Cruisers without prior shaft experience or with stuck/corroded shafts let the yard handle it. The hybrid approach works too — pull the shaft yourself, take it to the yard's bearing press, reinstall yourself.
Frequently asked questions
When to replace?
Hand-test for play at haul-out. Replace at noticeable wear.
Cost?
Bearing $80–200. Yard install $500–1,100. DIY $80–200 plus time.
Tools needed?
Press or puller, shaft seal removal tools, basic spanners.
How long does it take?
4–8 hours DIY for an experienced owner.
What if shaft is stuck?
Yard help. Stuck shafts can require destructive removal.