Maintenance & Repair

Regular maintenance is the single most effective thing you can do to protect your investment and avoid expensive, inconvenient breakdowns. At Donlin Marine, we take a proactive approach — identifying small issues before they become big ones and keeping every system on your boat operating the way it was designed to.

hen something does go wrong, you want technicians who've seen it before. Our team is experienced across all major marine systems — mechanical, electrical, fuel, steering, and drive systems — and as an authorized Mercury Marine service center, we bring factory-level expertise to every job that comes through our doors. We work on what we sell, and we stand behind every repair we make.

Authorized Mercury Service

Factory-trained technicians and genuine Mercury parts — your engine gets the care it was built for.

Full-System Diagnostics

We don't just fix what's visible. Our diagnostic process identifies root causes across mechanical, electrical, and fuel systems.

Preventive Maintenance

Scheduled service keeps small issues from becoming expensive ones and extends the life of your entire boat.

All Makes & Models

We service what we sell — Avalon, Sylvan, Warrior, SunChaser, and Starcraft — plus most other brands on the water.

e start with a full intake conversation — what you're experiencing, when it started, and your boat's service history. No guessing, no assumptions.

Diagnosis & Inspection / Our technicians perform a thorough inspection and run diagnostics across all relevant systems to identify the issue and anything else that needs attention.

Once approved, we complete the work using quality parts and manufacturer-specified procedures. We keep you informed of progress and flag anything unexpected before moving forward.

Before your boat leaves our shop, it goes through a final quality inspection. We walk you through what was done and what to watch for heading into the season.

Before you launch, we inspect and service every critical system — engine, fuel, electrical, steering, and cooling — so your first day on the water isn't spent troubleshooting. / Label: Inspection · Tune-Up · Fluid Service

Oil changes, impeller checks, filter swaps, belt and hose inspections — we keep up with manufacturer service intervals so small wear items never turn into big problems. / Label: Oil Change · Filters · Belts & Hoses

Proper off-season maintenance protects your engine and systems from the damage that sitting causes. We flush, fog, stabilize, and prepare your boat to come back strong in the spring. / Label: Flushing · Fogging · Fuel Stabilization

Submit Your Service Request

Don't Wait Until Something Breaks Body: Whether you're due for a routine service or dealing with something that needs attention now, Donlin Marine in Pickstown, SD is here to help. Bring it in and let's take a look. Button 1: Call Us Today Button 2: Send a Message