Marine Mechanic Invoice Template

A marine mechanic invoice documents boat engine service including outboard, sterndrive, and inboard engine repair, marine electronics installation, fuel system service, winterization, and diagnostic work for recreational and commercial vessels. Generate detailed marine service invoices with NetInvoice to bill for specialized boat engine and systems work.

Why this invoice template matters

Marine mechanics command premium rates due to specialized knowledge of saltwater corrosion, marine electrical systems, and complex engine controls. Detailed invoicing justifies these rates by showing marine-specific parts, corrosion prevention procedures, and the expertise required to diagnose intermittent problems that only occur on water. Documentation must separate engine mechanical work from marine systems (cooling, exhaust, electrical) because customers need to understand how saltwater environment affects every component. Professional invoices help boat owners understand scheduled maintenance intervals measured in hours rather than miles, and why preventive maintenance is critical for marine engines that operate in harsh conditions.

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Example line items

DescriptionQtyUnitUnit PriceTotal
Marine engine diagnostic (on-water testing)2.5hours$145.00$362.50
Thermostat and gasket replacement1kit$125.00$125.00
Raw water pump rebuild1ea$275.00$275.00
Engine oil change (marine synthetic)7quarts$15.00$105.00
Fuel filter replacement (water separator)2filters$45.00$90.00
Corrosion prevention treatment (fogging)1treatment$85.00$85.00
Zinc anode inspection and replacement4anodes$28.00$112.00
Total:$1154.50

Common invoice notes

  • Engine overheating caused by failed thermostat and raw water pump.
  • Zinc anodes heavily corroded - increase inspection frequency.
  • Recommend fuel system treatment every 50 operating hours.

How to create this invoice

  1. 1Document vessel type, engine make/model, and operating hours.
  2. 2List diagnostic findings including on-water testing results.
  3. 3Detail engine mechanical repairs with marine-specific parts.
  4. 4Include cooling system service: raw water pump, thermostat, impeller.
  5. 5Add fuel system work: filters, water separators, treatment.
  6. 6Document corrosion prevention: anodes, fogging, treatments.
  7. 7Note recommended service intervals by engine hours.

Frequently Asked Questions

How much do marine mechanics charge per hour?
Marine mechanics charge $110-$175 per hour depending on region and specialization. Higher than automotive due to marine environment expertise, specialized tools, saltwater corrosion knowledge, and electronics troubleshooting. Mobile service and on-water diagnostics command premium rates.
What's included in marine engine service?
Marine engine service includes: oil/filter change, spark plugs, fuel filters/water separator, impeller inspection, thermostat check, zinc anode replacement, corrosion fogging, gear oil check, battery test, and belt inspection. Cost $300-$800 depending on engine size.
How do marine mechanics charge for on-water diagnostics?
On-water diagnostics cost 1.5-2x shop rates ($150-$200/hour) due to time, equipment, and complexity of testing under actual operating conditions. Some problems only occur at speed or under load. Bill separately from repair work.
Should marine invoices explain saltwater versus freshwater service?
Yes, saltwater environments require more frequent service: anodes every 100 hours vs 200 hours freshwater, more aggressive corrosion prevention, raw water system flushing. Document environment to justify service intervals and preventive maintenance recommendations.

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