Should You Buy a Used Diesel Boat in Seattle? What to Check First.
Seattle’s used-boat market is among the most active in the country. Whether shopping around Lake Union, Shilshole, Tacoma, Edmonds, or Everett, buyers often move quickly to secure a vessel. But diesel engines hide issues that general surveys cannot detect. A proper engine inspection saves thousands and prevents unpleasant surprises.
Engine Hours vs. Engine Condition
Hours don’t tell the whole story. A 3,000-hour diesel with proper maintenance may be healthier than a 700-hour engine with neglect. Focus on:
Oil sample results
Cooling system condition
Injector and pump health
Compression
Maintenance history
Signs of Prior Overheating
Buyers should check for:
Burn marks on hoses
Discolored paint
Exhaust elbow corrosion
Coolant staining
Warped gaskets
Overheating is one of the leading causes of engine replacement.
Compression and Combustion Health
Cold starts, long crank times, white smoke, or rough idling indicate combustion issues. Compression tests or borescope inspections reveal internal wear.
Fuel System Condition
Inspect:
Filters
Injectors
Tanks for water or sludge
Signs of microbial growth
Lift pump function
Fuel system repair often costs $2,000 or more in Seattle.
Cooling System Health
Inspect:
Heat exchanger
Raw water pump
Impeller
Coolant quality
Zinc anodes
Neglecting the cooling system leads to overheating and rapid engine damage.
Exhaust System Condition
Exhaust elbows commonly fail in Seattle due to internal corrosion from saltwater. Replacement costs can range from $400 to $1,000.
Why a Diesel Mechanic Inspection is Essential
General surveyors do not specialize in diesel engines. A professional engine inspection includes diagnostics, photos, oil samples, smoke analysis, and component evaluation.
Before buying a used boat in Seattle, schedule a full pre-purchase diesel inspection with Nautix Marine for an accurate, professional engine evaluation. Call or text us to schedule an inspection.
