Marine Diesel Engine Surveys & Inspections
Know the Condition Before You Buy, Sell or Commit to Major Repairs.
All Tech Diesel provides professional marine diesel engine surveys, generator inspections and mechanical condition assessments for yachts and diesel-powered vessels throughout Naples, Marco Island and Southwest Florida.
From pre-purchase engine inspections and computer diagnostics to sea trials, fluid analysis, compression testing and borescope inspections, our goal is to give you a clearer understanding of the vessel’s mechanical condition before important decisions are made.
Mobile Dockside Service
We come directly to your vessel, dock or marina throughout Southwest Florida.
Advanced Diagnostics
Professional troubleshooting using advanced diagnostic tools and systematic testing.
Marine Diesel Specialists
Focused on marine diesel engines, generators and supporting mechanical systems.
Southwest Florida Service
Serving yacht and boat owners throughout Naples, Marco Island and Southwest Florida.
Marine Diesel Engine Surveys & Pre-Purchase Inspections in Southwest Florida
A yacht or boat can look excellent cosmetically while still having expensive mechanical problems hidden inside its engines, generators, transmissions or supporting systems.
A professional marine diesel engine survey and mechanical inspection can help identify developing problems before purchasing a vessel, planning major repairs or committing to a long-distance trip.
All Tech Diesel provides marine diesel engine surveys, pre-purchase inspections, generator assessments and mechanical condition inspections throughout Naples, Marco Island and Southwest Florida.
Our inspections can evaluate engine condition, operating performance, fault history, cooling systems, fuel systems, transmission condition and generator operation.
Depending on the vessel and level of inspection requested, additional testing may include compression testing, borescope inspection, blow-by testing, engine oil analysis, coolant analysis, transmission fluid analysis and generator load testing.
A sea trial is another important part of evaluating marine diesel engines because many problems only appear when the propulsion system is placed under operating load.
Overheating, loss of power, abnormal RPM, smoke, vibration and engine alarms may not be visible while the vessel is tied to the dock.
Electronically controlled engines may also contain stored fault codes and historical operating information that can provide valuable insight into previous problems.
Whether you are considering purchasing a yacht, evaluating a vessel before sale or simply want a better understanding of your current engine and generator condition, All Tech Diesel can provide a focused mechanical inspection and clear service recommendations.
What Can Be Evaluated?
The exact scope depends on the vessel and inspection requested, but a mechanical survey may evaluate several major systems.
Additional Inspection & Testing Options
Why a Sea Trial Matters
Many diesel engine and drivetrain problems only appear when the vessel is operating under load. A sea trial can help reveal overheating, loss of power, abnormal RPM, smoke, vibration, alarms and other performance conditions that may not be visible while the vessel is tied to the dock.
Need a Marine Engine or Mechanical Inspection?
Tell us about the vessel, engines, generators and the type of inspection you need. All Tech Diesel can help determine the appropriate inspection and testing scope.
What a Marine Diesel Survey Can Help Identify
Hidden Engine Problems
A vessel may appear to operate normally at the dock while still having cooling, fuel, compression or performance problems that become apparent under load.
Unknown Maintenance History
Incomplete service records can make it difficult to determine which major maintenance items have been completed and what may be overdue.
Engine Fault History
Stored fault codes and electronic engine information may reveal previous alarms or operating conditions that are not obvious during a visual inspection.
Overheating Concerns
Cooling-system restrictions, weak raw-water flow and heat exchanger problems can sometimes become apparent during inspection or sea-trial testing.
Loss of Power or RPM
An engine that cannot achieve expected performance under load may have fuel, air, turbocharger, exhaust, mechanical or vessel-load problems.
Excessive Blow-By
Abnormal crankcase pressure can indicate internal engine wear and may justify further compression or borescope testing.
Low or Uneven Compression
Compression differences between cylinders can indicate valve, piston, ring or cylinder-related wear.
Fluid Contamination
Oil, coolant and transmission fluid condition can reveal signs of water intrusion, overheating, internal wear or other mechanical concerns.
Generator Problems
A generator may start and run but still have cooling, voltage, frequency or load-related problems that should be identified before purchase.
Transmission Concerns
Fluid condition, leaks, engagement behavior, vibration and operating performance can provide valuable information about the drivetrain.
Excessive Smoke
Black, blue or white smoke during startup or under load can indicate fuel, combustion, air-flow, oil-consumption or cooling-related issues.
Deferred Maintenance
Worn belts, hoses, leaking components, old filters, deteriorated impellers and other neglected items can help reveal the overall maintenance condition of the vessel.
Considering Buying a Yacht or Boat?
A professional engine, generator and mechanical inspection can help you better understand the condition of the vessel before you make a major investment.
Our Marine Diesel Diagnostic & Repair Process
Initial Assessment
We review your concerns, engine history and the conditions under which the problem occurs.
Visual & Mechanical Inspection
We inspect critical engine components, fluids, belts, hoses, wiring and related systems.
Advanced Diagnostics
When appropriate, we use computer diagnostics, fault codes and professional testing equipment.
Root Cause Analysis
We determine what is actually causing the problem rather than simply treating the symptoms.
Repair Plan
We explain our findings and recommend the appropriate repair, testing or next step.
Professional Repair
Approved repairs are completed using the appropriate parts, procedures and service methods.
Testing & Sea Trial
We test engine operation and, when needed, verify performance under real operating load.
Final Verification
We confirm the original problem has been addressed and provide any additional recommendations.
Complete Marine Diesel Engine Survey & Inspection Services
Pre-Purchase Diesel Engine Inspection
Evaluate propulsion engines before purchasing a yacht or boat. Inspection may include visual condition, fluids, leaks, belts, hoses, cooling systems, fuel systems, mounts, electronic diagnostics and operational testing. Additional testing may be recommended when concerns are identified.
Marine Diesel Engine Survey
Perform a focused mechanical assessment of propulsion engines including leaks, corrosion, cooling, fuel systems, belts, hoses, mounts, exhaust components and engine performance. Electronic diagnostic information may also be reviewed when compatible access is available.
Engine & Generator Condition Inspection
Evaluate the vessel's major diesel-powered systems together. Engines and generators can be inspected for leaks, corrosion, cooling-system condition, fuel-system concerns, belts, hoses, fluid condition and abnormal operating behavior.
Marine Generator Survey
Evaluate generator starting behavior, fluids, leaks, cooling systems, raw-water flow, fuel delivery, belts, hoses, electrical output and controller condition. Generator operation may also be evaluated under electrical load when appropriate.
Engine Health Assessment
Review operating behavior, visible engine condition, electronic diagnostics, blow-by observations, fluid condition and service history. Compression testing, borescope inspection or oil analysis may be added when deeper condition information is required.
Sea Trial Assistance
Observe engine temperature, RPM, acceleration, smoke, vibration, engine alarms and other mechanical behavior under actual vessel operating conditions. On twin-engine vessels, differences between port and starboard performance may also provide useful information.
Sea Trial Engine Diagnostics
Investigate conditions that may only appear under load, including overheating, inability to reach rated RPM, turbocharger concerns, loss of power and intermittent alarms. Sea-trial data can help determine whether additional testing or repairs should be recommended.
Computer Diagnostic Scan
Review active fault codes, stored events and other available diagnostic information on electronically controlled marine diesel engines. Electronic information is considered alongside physical inspection and operational testing rather than used by itself.
Engine Fault History Review
Review stored engine history for previous overheating events, oil-pressure warnings, sensor faults, electrical issues and other abnormal operating conditions that may not be active during the inspection.
Fluid Analysis
Laboratory fluid analysis can provide additional information about engine, transmission and cooling-system condition. Samples may include engine oil, transmission fluid or coolant depending on inspection needs.
Engine Oil Analysis
Analyze engine oil for wear metals, fuel dilution, coolant contamination, soot and other substances that may indicate internal wear, combustion problems or contamination requiring further investigation.
Transmission Fluid Analysis
Evaluate transmission fluid for wear metals, water contamination and other conditions that may indicate abnormal gearbox wear or developing mechanical problems, especially on high-hour or poorly documented vessels.
Coolant Analysis
Evaluate coolant condition, corrosion protection and contamination. Abnormal coolant may indicate neglected maintenance, internal contamination or developing cooling-system problems that require further inspection.
Compression Testing
Measure how effectively each diesel cylinder seals during compression. Low or uneven readings may indicate worn piston rings, cylinder wear, valve problems, cylinder-head concerns or other internal mechanical conditions.
Borescope Inspection
Visually inspect accessible internal engine areas without complete disassembly. Depending on engine design, this may reveal cylinder-wall condition, piston surfaces, deposits, corrosion or other internal concerns.
Blow-By Testing
Evaluate crankcase pressure when internal engine wear is a concern. Excessive blow-by may indicate piston-ring or cylinder wear and should be considered together with engine hours, compression, oil consumption and other diagnostic information.
Engine Performance Testing
Evaluate starting, idle quality, acceleration, temperature, oil pressure, RPM, throttle response, smoke and overall smoothness. Testing under load during a sea trial often provides the most meaningful performance assessment.
Generator Load Testing
Evaluate how the marine generator performs while supplying realistic electrical demand. Load testing may reveal voltage, frequency, cooling or engine-speed problems that do not appear while the generator runs unloaded.
Cooling System Inspection
Inspect raw-water pumps, impellers, hoses, heat exchangers, coolant condition, strainers and other accessible cooling components for evidence of leaks, corrosion, restrictions or deferred maintenance.
Fuel System Inspection
Inspect accessible filters, separators, hoses, fittings and fuel-related components for leaks, contamination and maintenance concerns. Water or debris in filters may indicate contamination inside the vessel's fuel tanks.
Engine Hours Verification
Review displayed engine hours together with available electronic operating data, physical engine condition and service history. Hour information can help determine which major maintenance intervals should already have been completed.
Pre-Purchase Mechanical Report
Document relevant findings from the engine, generator and mechanical inspection so prospective buyers have a clearer understanding of observed issues, maintenance concerns and recommendations for additional diagnostics or service before closing on the vessel.
The Inspection Scope Can Be Tailored to the Vessel
A pre-purchase yacht inspection may require a broader mechanical condition assessment than a targeted engine inspection requested by an existing owner. All Tech Diesel can adjust the inspection scope based on vessel configuration, engine hours, service history and the information you need to make an informed decision.
Need a Marine Diesel Engine or Pre-Purchase Inspection?
Tell us about the vessel, engines, generators and the type of inspection you need. All Tech Diesel can help determine the appropriate survey, testing and reporting scope.
Marine Diesel Engine Survey & Inspection FAQs
1 What is a marine diesel engine survey?
A marine diesel engine survey is a focused mechanical inspection of the vessel's propulsion engines and related systems.
It may include visual inspection, operational testing, fluid condition, electronic diagnostics, cooling and fuel-system inspection and sea-trial evaluation.
Additional testing can be added when deeper engine-condition information is required.
2 Is an engine survey different from a general marine survey?
Yes. A general marine survey typically evaluates the overall vessel, structure, safety equipment and many onboard systems.
A marine diesel engine survey focuses more specifically on the engines, generators, transmissions and related mechanical systems.
For a pre-purchase inspection, the two services can complement each other.
3 Should I have the engines inspected before buying a yacht?
Yes. Engines, generators and transmissions can represent a substantial portion of the vessel's future repair cost.
A professional mechanical inspection can help identify existing problems, deferred maintenance and areas that may require additional testing before completing the purchase.
4 What should be included in a pre-purchase diesel engine inspection?
The scope can vary, but it may include visual inspection, fluid condition, leaks, belts, hoses, cooling systems, fuel systems, electronic diagnostics, engine operation and a sea trial.
Compression testing, borescope inspection and fluid analysis can also be performed when appropriate.
5 Is a sea trial necessary for a marine engine inspection?
A sea trial is strongly recommended for a thorough pre-purchase engine evaluation.
Many problems—including overheating, loss of power, inability to reach RPM and certain alarms—may only occur when the engine is placed under operating load.
6 Can you inspect both the engines and generator?
Yes. All Tech Diesel can inspect propulsion engines and marine generators as part of the same mechanical condition assessment.
Generator testing can also include electrical-output or load testing when appropriate.
7 What does engine oil analysis tell me?
Oil analysis can identify wear metals, fuel dilution, coolant contamination and other substances within the engine oil.
It can provide useful clues about internal engine condition, particularly on high-hour engines.
Results should be interpreted along with the engine's operating condition and service history.
8 What does compression testing tell me?
Compression testing helps evaluate cylinder sealing and internal engine condition.
Low or uneven compression can indicate worn rings, cylinder wear, valve problems or other mechanical concerns.
It is typically recommended when other inspection findings raise questions about internal engine health.
9 What is a borescope inspection?
A borescope is a small camera used to visually inspect certain internal engine areas through available access points.
It may reveal cylinder-wall condition, piston surfaces, deposits or corrosion without requiring complete engine disassembly.
10 What is marine diesel blow-by?
Blow-by is combustion gas that passes the piston rings and enters the crankcase.
Some blow-by is normal, particularly on higher-hour engines, but excessive blow-by may indicate internal wear.
It should be evaluated together with compression, oil consumption and other engine-condition information.
11 Can you check the engine's fault history?
On compatible electronically controlled engines, diagnostic equipment may provide access to stored fault codes and engine events.
This information can reveal previous alarms or conditions that may not be active during the inspection.
12 Can you verify the engine hours?
Where compatible electronic information is available, diagnostic data may help provide additional context about engine operating hours.
Displayed hour meters, electronic information and maintenance records should be reviewed together whenever possible.
13 Can a generator be load tested during a pre-purchase inspection?
Yes. Generator load testing can help determine whether the unit maintains stable voltage, frequency, temperature and engine performance under realistic electrical demand.
This provides more useful information than simply confirming that the generator starts.
14 Can the inspection tell me exactly how long the engines will last?
No mechanical inspection can accurately predict the exact remaining life of an engine.
The purpose is to evaluate current condition, identify visible or measurable concerns and provide information that helps you make a more informed decision.
15 Do you provide marine diesel inspections in Naples and Marco Island?
Yes. All Tech Diesel provides marine diesel engine surveys, generator inspections, sea-trial assistance and mechanical condition assessments throughout Naples, Marco Island and surrounding Southwest Florida boating communities.
Travel may also be available for selected inspections outside the immediate service area.
Considering Buying a Yacht or Boat?
A professional engine, generator and mechanical inspection can help you better understand the vessel's condition before making a major investment. Tell us about the vessel and the inspection scope you need.
REQUEST A PRE-PURCHASE INSPECTIONwhy choose us
Why Choose All Tech Diesel?
Expert marine diesel service. Advanced diagnostics. Reliable performance—wherever you are on the water.
Marine Diesel Specialists
Focused on marine diesel engines, generators and the mechanical systems that keep your vessel running reliably.
Mobile & Dockside Service
We come directly to your vessel, dock or marina throughout Southwest Florida.
Diagnostic-First Approach
We focus on identifying the actual cause of the problem before recommending unnecessary parts or repairs.
Advanced Service Capabilities
From diagnostics and preventative maintenance to major repairs, rebuilds, repowers and generator service.
Clear Communication
We explain what we find, what we recommend and why, so you can make informed decisions about your vessel.
BRANDS WE SERVICE
Working on the Best. Servicing the Best.
REQUEST SERVICE
Keep Your Vessel Ready. Get Expert Marine Diesel Service.
Whether you need diagnostics, repairs, scheduled maintenance, generator service or major engine work, All Tech Diesel is ready to help.
Tell us about your vessel and what you need, and our team will help determine the right next step. Mobile service is available throughout Marco Island, Naples and Southwest Florida.
Call (239) 537-6125 or complete the contact form to get started.
- Mobile & Dockside Service
- Marine Diesel Engine & Generator Specialists
- Diagnostics, Repairs & Preventative Maintenance
- Major Engine Repair & Repower Support
- Serving Southwest Florida
SERVICE AREA
Mobile Marine Diesel Service Throughout Southwest Florida
All Tech Diesel provides mobile marine diesel engine, generator, diagnostic, maintenance and mechanical services throughout Southwest Florida. Our technicians travel directly to your vessel, dock or marina, making it easier to get professional service without moving your boat unnecessarily.
Whether you need routine maintenance, advanced diagnostics, emergency repairs, engine or generator service, inspections, rebuilds or repower support, our mobile team is available throughout the region.
In-state and out-of-state travel may also be available for select major repairs, repowers, inspections and specialized projects.
- Marco Island
- Naples
- Bonita Springs
- Estero
- Fort Myers
- Cape Coral
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Ready to Get Started?
Need marine diesel engine, generator, maintenance, repair or diagnostic service? Tell us about your vessel and what you need, and the All Tech Diesel team will help determine the right next step.