I/O Services
Inboard and outboard sterndrive service for MerCruiser and Volvo Penta powered boats
Schedule I/O Service
MerCruiser And Volvo Penta Specialists
An inboard/outboard, or I/O, boat pairs an inboard mounted engine with an outdrive that steers and trims like an outboard. Our technicians service the full system on MerCruiser and Volvo Penta powered boats, from the engine itself to the cooling system, transom assembly, and the electrical components that keep everything running and reading correctly.
Because an I/O system has more moving parts than a straight outboard, regular service on the engine and the drive together goes a long way toward avoiding an expensive failure mid season.
Complete I/O System Service
Sterndrive Tune-Ups
Spark plugs, filters, and timing checks for MerCruiser and Volvo Penta engines to keep them starting and running smoothly.
Cooling System Service
We inspect and service the raw water pump, impeller, and heat exchanger to prevent overheating on the water.
Transom And Bellows Inspection
We check the transom assembly and exhaust bellows for wear or cracking, a common source of water intrusion on I/O boats.
Electrical And Gauge Diagnostics
We diagnose charging, starting, and gauge issues using manufacturer specific tools for MerCruiser and Volvo Penta systems.
MerCruiser And Volvo Penta Focused
I/O service at Bertha Boatworks is built around MerCruiser and Volvo Penta systems, alongside general service for other major engine brands.
Do not see your I/O brand listed? Fill out the form and we will let you know if we are able to service it.
How I/O Service Works
Diagnosis And Intake
We identify the specific issue or confirm the scope of routine service before any work begins.
Engine And Cooling System Service
We service the engine, raw water pump, impeller, and heat exchanger as needed to keep the system running cool and reliably.
Transom And Electrical Check
We inspect the transom assembly, bellows, and electrical system, including charging and gauge circuits.
Water Test
Your boat is tested on the water to confirm proper operation across the full throttle range before it comes back to you.
Ready To Schedule I/O Service?
Fill out the form below and our service team will follow up to find a time that works for your boat and your schedule.
MerCruiser And Volvo Penta Experience
Manufacturer Specific Tools
We use manufacturer specific diagnostic tools built for MerCruiser and Volvo Penta systems.
Whole System Approach
We check the engine, drive, and electrical system together, since I/O problems rarely stay isolated to one part.
Every Service From The Same Marina
Your boat comes back to the same technicians and the same marina on the Whitefish Chain for every future visit.
I/O Service Questions Answered
I/O stands for inboard/outboard. The engine is mounted inside the boat like an inboard, but it drives a sterndrive unit outside the transom that steers and trims like an outboard.
Yes. MerCruiser and Volvo Penta are our two most serviced I/O platforms, and we carry the tools and training for both.
Most manufacturers recommend impeller replacement every one to two seasons, since a worn impeller can lead to overheating. We check it as part of routine I/O service.
Yes. We diagnose charging, starting, and gauge issues using manufacturer specific tools for MerCruiser and Volvo Penta electrical systems.