About

805 Marine Diesel Mechanic is a veteran-owned mobile marine diesel service business built on more than 30 years of hands-on engine room experience, from U.S. Navy Detroit Diesel training to commercial crab boats in Alaska and inboard diesel diagnostics throughout Ventura, Oxnard, Santa Barbara, and Channel Islands Harbor.

Schedule Mobile Marine Diesel Service Master Marine Diesel Troubleshooting Guide

805 Marine Diesel Mechanic is a family-owned and veteran-owned marine diesel service company specializing in inboard diesel engines, engine-room diagnostics, fuel systems, cooling systems, electrical troubleshooting, turbocharger problems, propulsion systems, and marine engine surveys throughout Ventura, Oxnard, Santa Barbara, and Channel Islands Harbor.

Many diesel problems appear complicated at first, but the root cause is often found by approaching the engine as a complete system. Before replacing expensive components, owners often begin with the Master Marine Diesel Troubleshooting Guide to determine whether the issue is related to fuel delivery, air restriction, turbocharger performance, exhaust backpressure, electrical faults, cooling-system restriction, or drivetrain load.

More Than 30 Years of Real Marine Diesel Experience

At 17 years old, Jeff joined the U.S. Navy and trained at Engine-Man A-School working around Detroit Diesel platforms including the 6-71, 12V71, and 8V92 series. That early training built the foundation for decades of hands-on marine diesel engine-room work under real operating conditions.

After leaving the Navy in 1985, Jeff traveled north to Dutch Harbor, Alaska, where he began working aboard commercial crab fishing vessels as engineer. Maintaining commercial diesel engines offshore in the Bering Sea requires practical diagnostic thinking because fuel contamination, cooling-system restriction, turbocharger failure, electrical problems, and drivetrain overload can all become critical safety issues when operating far offshore.

Commercial Crab Boat Engine Room Experience

Over the next 19 years, Jeff worked aboard multiple commercial crab boats maintaining engines, generators, hydraulic systems, cooling systems, propulsion systems, and shipboard electrical equipment. Those years created experience across many diesel platforms including Cummins, Volvo Penta, Caterpillar, MAN, Yanmar, Lugger, Ford Lehman, MTU, Detroit Diesel, Perkins, Scania Marine, Nanni, Vetus, and other commercial-duty marine engines.

Commercial fishing vessels demand reliability because small issues quickly become major failures offshore. A simple cooling restriction may lead to overheating under load. A dirty Racor can create loss of power under load. A turbocharger restriction may cause black smoke and slow spool-up.

Why 805 Marine Diesel Mechanic Was Created

After years in commercial fishing and raising a family, the focus shifted toward helping yacht owners, sportfisher owners, sailboat owners, and commercial operators throughout Southern California maintain reliable inboard diesel systems.

The goal of 805 Marine Diesel Mechanic is simple: diagnose the actual root cause instead of guessing at parts. Marine diesel problems rarely exist in isolation. A hard-starting engine may actually have fuel-system air intrusion. Excess smoke may be related to exhaust restriction. RPM loss may involve propeller overload, turbocharger lag, cooling-system restriction, or drivetrain drag.

Marine Diesel Diagnostic Services

805 Marine Diesel Mechanic specializes in system-based marine diesel troubleshooting and repair for inboard diesel vessels throughout Ventura, Oxnard, Channel Islands Harbor, and Santa Barbara.

Fuel System Experience

Fuel contamination remains one of the most common causes of offshore breakdowns. Warm harbor conditions allow water accumulation, sludge, algae growth, and filter restriction to develop inside diesel tanks.

Fuel-system diagnosis may include:
diesel algae contamination,
Racor troubleshooting,
fuel-system priming,
fuel contamination diagnosis,
fuel restriction vs air restriction,
and no-start after fuel filter changes.

Many engines blamed for injector or turbocharger problems are actually suffering from contaminated fuel, weak lift-pump delivery, clogged pickup tubes, or air intrusion.

Cooling-System and Raw-Water Diagnostics

Cooling-system problems are another major focus area. Southern California saltwater environments create scale buildup, impeller damage, zinc debris, heat-exchanger fouling, and raw-water flow restriction over time.

Cooling diagnostics may include:
raw-water flow diagnosis,
heat-exchanger restriction diagnosis,
seawater pump and impeller diagnosis,
aftercooler servicing,
fresh-water flushing systems,
and idle-vs-cruise overheating diagnosis.

Electrical and Propulsion Experience

Modern marine diesel systems depend heavily on reliable electrical systems, control systems, and propulsion components. Corrosion, voltage drop, sensor failure, or poor grounds can create intermittent faults that mimic major engine problems.

Additional areas of service include:
Glendinning electronic propulsion systems,
high exhaust temperature diagnosis,
boost-pressure testing,
excessive vibration diagnosis,
and turbo lag troubleshooting.

Serving Ventura, Oxnard, Santa Barbara & Channel Islands Harbor

805 Marine Diesel Mechanic provides mobile marine diesel diagnostics, maintenance, troubleshooting, inspections, and repair planning throughout Ventura Harbor, Oxnard, Channel Islands Harbor, Santa Barbara Harbor, and surrounding Southern California coastal areas.

Whether working on a trawler, sailboat auxiliary diesel, sportfisher, commercial vessel, cruising yacht, or generator platform, the approach remains the same:
identify the symptom,
test the systems,
verify the root cause,
and repair the actual failure instead of replacing random parts.

External Authority Resources

Caterpillar Marine Engines |
Cummins Marine Engines

Schedule Mobile Marine Diesel Service

805 Marine Diesel Mechanic FAQ

1. What areas does 805 Marine Diesel Mechanic serve?

805 Marine Diesel Mechanic provides mobile marine diesel service throughout Ventura, Oxnard, Channel Islands Harbor, Santa Barbara, and surrounding Southern California harbors. Service includes diagnostics, troubleshooting, maintenance, surveys, and repair planning for inboard diesel vessels.

2. What types of marine engines do you work on?

The company works on many inboard marine diesel brands including Cummins, Caterpillar, Volvo Penta, Yanmar, MAN, Lugger, Perkins, MTU, Detroit Diesel, Ford Lehman, Vetus, and other marine diesel platforms. Both mechanical and electronically controlled engines are serviced.

3. Do you specialize in inboard diesel engines?

Yes, the business focuses primarily on inboard marine diesel systems. Services include fuel systems, cooling systems, turbochargers, electrical systems, propulsion systems, engine diagnostics, and surveys.

4. What makes your diagnostic process different?

The focus is on system-based diagnostics instead of guessing at parts. Fuel, air, cooling, exhaust, electrical, turbocharger, and drivetrain systems are evaluated together to identify the real root cause.

5. Do you provide marine engine surveys?

Yes, marine engine surveys are available for buyers, sellers, and owners evaluating overall engine condition. Surveys may include diagnostics, sea-trial observations, smoke evaluation, cooling performance, and fuel-system inspection.

6. Can you diagnose hard-starting diesel engines?

Yes, hard-starting diagnosis is one of the most common service requests. Causes may include fuel restriction, air intrusion, weak batteries, injector problems, preheat faults, or low cranking speed.

7. Do you work on turbocharger problems?

Yes, turbocharger and boost-system diagnostics are part of the troubleshooting process. Slow spool-up, smoke, oil leakage, low boost, and restricted aftercoolers are common issues.

8. Can contaminated fuel damage marine diesel engines?

Yes, contaminated fuel can clog filters, damage injectors, reduce power, and cause offshore shutdowns. Fuel contamination and algae growth are common in boats that sit unused for long periods.

9. Do you troubleshoot overheating problems?

Yes, cooling-system diagnosis includes seawater pumps, impellers, heat exchangers, aftercoolers, raw-water flow, zinc debris, and saltwater restriction diagnosis.

10. Can you diagnose electrical problems?

Yes, electrical troubleshooting includes batteries, charging systems, starter circuits, voltage drop, grounds, sensors, shutdown systems, and propulsion controls.

11. Do you provide mobile service?

Yes, mobile marine diesel service is provided throughout local harbors and marinas. This allows troubleshooting and inspections directly at the vessel location.

12. Can you help with low power and RPM loss?

Yes, low-power complaints are diagnosed through fuel, air, cooling, turbocharger, exhaust, and drivetrain testing. Sea-trial behavior is often important during diagnosis.

13. What causes marine diesel smoke?

Smoke can result from fuel restriction, turbocharger issues, injector problems, cooling faults, exhaust restriction, or internal engine wear. Smoke color and operating conditions help narrow the diagnosis.

14. Do you work on older diesel engines?

Yes, many older mechanical diesel platforms are serviced including Detroit Diesel, Ford Lehman, Perkins, and early Cummins and Caterpillar engines.

15. Do you work on generators?

Yes, marine diesel generator systems including Northern Lights, Westerbeke, Kohler, Onan, Phasor, and other platforms are serviced and diagnosed.

16. Can you diagnose vibration problems?

Yes, excessive vibration may involve engine mounts, propellers, shafts, alignment, couplers, or drivetrain load problems. Diagnosis focuses on identifying the actual vibration source.

17. Do you offer emergency service?

Emergency and urgent diagnostic support may be available depending on location and scheduling. Rapid troubleshooting helps minimize downtime and prevent additional damage.

18. Can you help decide between rebuild or repower?

Yes, rebuild-vs-repower evaluation includes overall engine condition, operating history, cooling condition, parts support, and long-term ownership goals.

19. Why is system-based troubleshooting important?

Marine diesel problems often involve multiple connected systems. Treating only one symptom without identifying the underlying cause can waste money and create repeated failures.

20. What is the first step if my marine diesel has a problem?

The first step is identifying the operating symptom clearly: no-start, smoke, overheating, power loss, vibration, shutdown, or RPM restriction. From there, the systems connected to that symptom can be tested logically.