300-Hour Outboard Service: What Gets Replaced?
If the 100-hour service is your oil change, the 300-hour service is your full physical. This is where we open up the cooling system, pull the water pump, and replace the parts that fail catastrophically when they go.
Need this done on your boat?
Fastest turnaround shop in Vero Beach. Call, text, or request a quote online — we'll get you on the schedule.
What's in the 300-hour service
- Full 100-hour service (oil, filters, plugs, gear oil)
- Water pump impeller, housing, key, and gaskets
- Thermostat(s) and pressure-relief poppet valve
- All sacrificial anodes — replaced, not just inspected
- Steering tube and tilt-tube grease
- Trim/tilt fluid check and top-off
- Engine-mount and transom-bolt torque verification
- Cooling pressure test to confirm no leaks before delivery
Why the water pump replacement is non-negotiable
The rubber impeller that pumps cooling water through your powerhead has the lifespan of a tire. It cracks, glazes over, and eventually shreds. When it shreds at 4,000 RPM offshore the engine overheats in under 60 seconds and you blow a head gasket — or worse, warp a head. A $400 impeller job avoids a $3,500 powerhead.
FAQs
Can I skip the water pump and just do oil/filters?
That's a 100-hour service, not a 300. If you skip the impeller you are gambling against a powerhead replacement. Don't.
Do twin or triple engines cost 2-3x the price?
Parts scale per engine, but we discount labor on multi-engine jobs. Request a quote and we'll text exact pricing.
Skip the maintenance headache.
Monthly turnkey care for $149* — we run your batteries, flush, check anodes, and remind you what's due. Members save 10% on all repair work.
Related Guides
What's actually included in a 100-hour outboard service: oil, filters, plugs, gear lube, anode check, and the Florida-specific items most shops skip.
Weak tell-tale, alarm at idle, steam from the cowling — the symptoms boaters miss until the powerhead overheats. What to watch for and what to do.
Stuck-closed thermostats overheat the powerhead. Stuck-open thermostats kill fuel economy and foul plugs. How to spot the difference.