Mobile boat repair + marine diagnostics.
When a boat will not start, overheats, alarms or loses power, Keelmark brings marine diagnostics and repair to the boat: at the dock, on the trailer or on the water, anywhere in Greater Seattle.
Find the cause before replacing parts.
Marine engine repair in Seattle
We diagnose and repair inboard, sterndrive and outboard engines at the boat: no-starts, hard starts, rough running, loss of power, warning alarms, ignition and fuel faults. Every visit starts with testing, so you pay for the repair the boat needs rather than parts it does not.
Boat service and repair, near you
Keelmark is a mobile marine mechanic. Instead of hauling the boat to a shop, we come to the marina, the private dock, the driveway or the launch across Seattle, Bellevue, Kirkland, Mercer Island, Renton and the rest of Greater Seattle. For most owners it is the quickest way to get boat repair near them.
Overheating and cooling systems
Raw-water pumps, impellers, hoses, thermostats, heat exchangers, risers and exhaust elbows. Overheating is one of the most common problems we see, and shutting down early is what keeps the repair small.
Repaired at the boat
Once the fault is confirmed we explain it plainly, confirm the scope and price, and complete the repair dockside whenever the job can reasonably be done there.
- No-start diagnostics
- Overheating diagnosis
- Ignition + fuel faults
- Cooling-system repair
- Pumps + impellers
- Inboard + sterndrive repair
- Outboard troubleshooting
- Compression + engine checks
- Warning alarms + senders
- Pre-purchase condition checks
Keelmark serves Seattle, Bellevue, Kirkland, Mercer Island, Renton, Shoreline, Lake Forest Park, Kenmore, Redmond, Sammamish and Bothell. Diagnostic visits are $150 for the first hour and $90 for each additional hour; winterization is a flat $150 for any boat.
Before you book.
Do you come to my boat, or do I bring it to a shop?
We come to you. Keelmark is fully mobile: at your slip, in the marina, at a private dock, on a trailer at home or at a launch anywhere in Greater Seattle.
How much does a marine diagnostic cost?
The first hour on board is $150, then $90 for each additional hour. Parts are quoted separately, and we confirm the scope before any work begins.
What kinds of engines do you work on?
Inboard, sterndrive and outboard engines on recreational boats, from weekend cruisers to larger yachts. Include the make and model when you request service.
My boat is overheating. What should I do?
Shut the engine down as soon as it is safe, check the raw-water intake and strainer if you can reach them, and send us a request. If you are stuck at the marina or on the water, use urgent assistance at any hour.
Urgent marine
service.
For urgent mechanical issues, call Keelmark. Our team will assess your needs and confirm the next steps.
Unable to call? Text us.·Emergency boat repair
Every system on board.
Tell us about the vessel.
We'll handle the rest.
Share your vessel details, location and service needs. We'll reply to confirm the details and arrange the visit.
Prefer to write directly? Text 425 623 0719