Why does my marine generator need regular oil and filter service?

Regular oil and filter changes keep your marine generator properly lubricated and free of contaminants. This prevents premature engine wear, improves efficiency, and ensures reliable power when you need it most—especially during long trips or overnight stays.

How often should generator oil, filters, and impellers be replaced?

Most marine generators require oil and filter service every 100 hours or once per season. Raw water impellers should typically be replaced annually or sooner if the generator runs frequently or in warm saltwater conditions.

What happens if the generator impeller is not replaced on time?

A worn or failed impeller can restrict cooling water flow, causing the generator to overheat and shut down. In severe cases, it can lead to costly damage to the heat exchanger or exhaust system.

What is included in your marine generator service?

Our service includes draining and replacing engine oil, installing new oil and fuel filters, inspecting and replacing the raw water impeller, checking belts, hoses, and coolant flow, and performing a full operational test after service.

Do you service all marine generator brands?

Yes, we service most major marine generator brands including Kohler, Westerbeke, Northern Lights, Onan, and Fischer Panda. We use manufacturer-approved oils, filters, and impellers whenever possible.

Can generator maintenance improve fuel efficiency and reliability?

Absolutely. Clean oil, fresh filters, and a healthy impeller allow your generator to run cooler and more efficiently. Proper maintenance reduces fuel consumption and minimizes the risk of unexpected shutdowns while underway or at anchor.

Do you provide documentation and warranty for generator service?

Yes, all services include written documentation for maintenance records. Parts are covered by manufacturer warranties, and our labor includes a service warranty ranging from 3 to 12 months depending on the scope of work.

Professional marine technician wearing a Breeze Marine polo installing a new oil filter

Marine Generator Oil, Filter & Impeller Service

SKU

2158

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$150.00

Card Text: Your generator is the heart of your comfort onboard. We perform comprehensive 100-hour services—changing oil, filters, and the critical raw water impeller—to ensure your AC and stove work when you need them.

Details

The 100-Hour Service

Powering Your
Comfort.

Your generator is the heart of your boat's luxury. Keep the AC cold and the batteries charged with our comprehensive maintenance service.

Engine Health

Generators run hotter and harder than propulsion engines. We change the oil and filters using manufacturer-spec lubricants to reduce wear.

Cooling Flow

The #1 cause of generator shutdown is overheating. We replace the raw water impeller annually to ensure consistent cooling water flow.

Clean Fuel

We replace both the primary (Racor) and secondary on-engine fuel filters, ensuring your generator gets clean diesel free of water and sludge.

Our Service Protocol.

A meticulous, multi-point check to ensure reliability at anchor.

Warm Up

We run the unit to bring oil to operating temp, suspending contaminants for a complete extraction.

Extract

We use vacuum extractors to remove old oil without spilling a drop in your bilge.

Replace

New oil, new filters, new impeller, and new pencil zincs (anodes) are installed.

Load Test

We run the generator under heavy load (AC/Stove) to verify voltage output and cooling temp.

Precision Maintenance.

Expert care for Onan, Kohler, and Westerbeke systems.

Clean yacht engine room with a serviced marine generator

Replacing the raw water impeller on a marine generator

Changing the fuel filter water separator on a marine generator

Proven Expertise.

We service all major marine generator brands found in Long Beach harbors.

Onan / Cummins MDK Series Specialists

Kohler Marine Gas & Diesel Service

Westerbeke Low-CO EFI Service

Common Questions

How often should I service my generator?

Manufacturers recommend every 100 hours of operation or once a year, whichever comes first. The impeller degrades with time, even if not used.

Why is my generator shutting down?

The most common cause is a lack of cooling water flow (bad impeller) or a clogged fuel filter. Our service addresses both.

Ready for the Season?

Don't let a breakdown turn into a marine generator repair that ruins your weekend. Schedule your 100-hour service today.

Service My Generator

Marine Generator Service for Onan, Kohler and Westerbeke

Our marine generator services follow the 100-hour schedule: every 100 hours of operation or once a year, whichever comes first. Marine diesel generator maintenance centers on three things that keep the unit running at anchor: fresh oil, clean fuel and steady cooling water. We change the oil and install new marine filters, including the primary Racor and the secondary on-engine fuel filter, replace the raw water impeller and pencil zincs, then load-test the generator with the AC and stove running.

For a Kohler marine generator service, as with Onan and Westerbeke units, tell us the model, the current hour reading and whether the unit has been shutting down or running hot. Booking marine generator service before the season starts leaves time to fix anything the load test turns up.

Does a generator need service after a quiet season?

Yes. Most of the generator maintenance Long Beach boat owners need comes down to oil, fuel and cooling water. A unit that sat unused for months still needs attention, because the raw water impeller ages with time as well as running hours, and a worn impeller is a common reason a generator overheats and shuts down at anchor.

Not sure when the last service was done? Check the hour meter. If 100 hours or a year have passed, whichever comes first, the 100-hour service is due.

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