High-output Cat 3512C service, diagnostics, overhauls & emergency support by 805 Marine Mechanic across Ventura, Oxnard, Channel Islands Harbor & Santa Barbara.
The Cat 3512C marine propulsion engine is engineered to make your investment work harder—delivering high power density, dependable torque, and cost-effective performance for workboats and commercial craft operating along the Southern California coast. At 805 Marine Mechanic, we specialize exclusively in inboard marine diesel service and support, helping owners and operators in Ventura, Oxnard, Channel Islands Harbor, and Santa Barbara get maximum uptime from their 3512C powerplants. With single-source support, streamlined diagnostics, and tight adherence to manufacturer-recommended procedures, we focus on lower total cost of ownership and proven reliability offshore.
Cat 3512C Overview
The 3512C drives down lifecycle cost with strong fuel economy, durable components, and straightforward serviceability. With a redesigned piston bowl shape for improved combustion and refined fuel delivery, the engine meets IMO II emissions standards while maintaining the high-output performance tugboats, ferries, offshore support vessels, and large fishing craft require. No aftertreatment is required for the stated ratings, simplifying installation and maintenance, while Caterpillar’s single-source support and parts network further reduces downtime.
Backed by the Caterpillar warranty and an industry-leading one-year parts warranty, the 3512C is a fully integrated marine power solution. Its ACERT™ technology (Advanced Combustion Emissions Reduction Technology) and turbocharged, aftercooled design deliver smooth, consistent power, with nominal rated BSFC that supports lower operating costs.
Standard Equipment
Air Inlet System
- Separate circuit aftercooler core, corrosion-resistant coated (air side)
- Powercore air cleaner
Control System
- Dual Caterpillar A4 Electronic Engine Control with Electronic Unit Injector Fuel System
- Rigid wiring harness (10-amp DC power required to drive Electronic Engine Control Module)
Exhaust System
- 3500C engines:
Fuel System
- Fuel transfer pump
- Electronically Controlled Unit Injectors
Lube System
- Top-mounted crankcase breather groups
- Oil filler and dipstick, LH or RH
- Gear-type oil pump
- 250- or 1000-hour sump oil pan
Power Takeoffs
- Accessory drives: Lower RH, lower LH
- Front housing, two-sided
Protection System
- A4 Electronic Monitoring System provides customer-programmable engine derating strategies to protect against adverse operating conditions
- Emergency stop push button (located in Electronic Instrument Panel)
- Safety shutoff protection
General
- Vibration damper and guard
- Lifting eyes
- NOTE: Engines for heat exchanger cooling do NOT include heat exchanger
Flywheel & Flywheel Housing
- Flywheel, SAE No. 00, 183 teeth
- Flywheel housing, SAE No. 00
Cooling System
- Oil cooler
- Thermostats and housing; full-open temperature 92°C (198°F)
- Jacket water pump, gear driven, centrifugal
- Auxiliary freshwater pump
- Aftercooler system: If using glycol, up to maximum 20% glycol concentration is allowed.
Instrumentation
- Electronic service meter, instrument panel (24V), start/stop switch, emergency stop button, maintenance due light, diagnostic light, warning light, maintenance clear switch, start motor magnetic switch, 15A & 3A breakers — The Cat 3512C marine propulsion engine
- Graphical Unit (Color Marine Power Display) for analog or digital
Cat 3512C Marine Propulsion Engine Services by 805 Marine Mechanic
The Cat 3512C is a high-performance, reliable, and durable engine designed for demanding marine applications. 805 Marine Mechanic provides comprehensive services to maintain peak performance and extend engine life—ranging from routine maintenance and advanced diagnostics to complete overhauls and emergency dockside repairs. Our diesel-only focus ensures deep expertise with V-12, 4-stroke commercial platforms like the 3512C used in tugboats, ferries, cargo vessels, and offshore support vessels.
Key Features of the Cat 3512C
- High Power Output
- Power Range: 1,499–2,682 bhp (1,117–2,000 bkW) at 1600–1800 RPM
- Engine Type: V-12, 4-stroke-cycle diesel
- Advanced Technology
- ACERT™ Technology: Advanced Combustion Emissions Reduction Technology for performance and lower emissions
- Turbocharged & Aftercooled: Efficient power delivery and stable operating temperatures
- Durable Construction
- Robust Design: Built for long service life in harsh marine environments
- Corrosion Resistant: Materials and coatings that stand up to saltwater exposure
- Fuel Efficiency
- Optimized Fuel System: Direct fuel injection supports lower operational costs
- Low Emissions: Meets stringent marine emission standards for cleaner operation
- Reliable Performance
- High Torque: Excellent low-speed torque for heavy-duty marine maneuvering
- Consistent Output: Reliable power in varying sea states and duty cycles
- Ease of Maintenance
- Accessible Components: Simplified service access reduces labor time
- Comprehensive Monitoring: Electronic monitoring enables proactive maintenance
Benefits for California Operators
- Enhanced Performance
- Strong output and torque help meet tight harbor schedules and offshore commitments
- Stable operation under continuous, heavy loads
- Operational Efficiency
- Fuel-efficient tuning reduces consumption on Ventura–Santa Barbara runs
- Durable assemblies minimize downtime and parts churn
- Environmental Compliance
- IMO II compliant — designed to support sustainable operations
- Lower noise and vibration improve crew comfort
- Versatile Applications
- Well-suited to tugboats, ferries, cargo vessels, and OSVs working the Santa Barbara Channel
Services Provided by 805 Marine Mechanic
- Routine Maintenance
- Scheduled Services: Oil & filter changes, coolant checks, inspections of belts/hoses and cooling systems
- Preventive Programs: Customized plans to prevent issues and prolong engine life
- Diagnostics & Repair
- Advanced Diagnostics: Electronic fault tracing, fuel and air system testing
- Component Repair/Replacement: Injectors, pumps, sensors, and harness repairs
- Engine Overhaul
- Full Overhauls: Restores performance and extends operating life
- Reconditioning: Heads and major components returned to spec
- Performance Optimization
- Tuning & Calibration: Optimize fuel and air delivery for your duty cycle
- Upgrades & Mods: Application-driven improvements for reliability and efficiency
- Emergency Services
- On-Site Repairs: Mobile response to minimize downtime
- 24/7 Support: Coverage for critical operations (subject to scheduling)
805 Marine Diesel Mechanic is a mobile marine diesel engine service company in Ventura / Santa Barbara / Channel Islands area.
805 Marine Mechanic
Services Already Aligned with 3512C Needs
- Routine maintenance: oil changes, filter replacements, coolant checks, belts & hoses, cooling system inspections
- Comprehensive diagnostics & repair: troubleshooting complex faults, parts repair/replacement
- Engine overhauls/rebuilds: cylinder head work; reconditioning worn components
- Fuel systems: injector cleaning, pump repairs, line inspections, tank cleaning/polishing
- Propulsion system: shaft/prop alignment, transmission servicing
Schedule Caterpillar 3512C Service
🛠️ Caterpillar 3512C Marine Engine Service Schedule
⚓ Daily / Before Each Run
- Check engine oil level & pressure
- Inspect coolant level & temperature
- Check for leaks (oil, fuel, coolant, seawater)
- Inspect belts, hoses, clamps
- Visual check of exhaust for smoke color (early problem indicator)
⏱ Every 250 Hours (or Quarterly, whichever comes first)
- Change oil & oil filters
- Inspect & clean/replace air filters
- Inspect & clean seawater strainer
- Inspect fuel lines & connections
- Check belts; adjust tension as needed
- Inspect exhaust system for leaks/corrosion
- Verify all gauges and alarms function
📍 805 Marine can perform all of the above as a routine service visit.
⏱ Every 500 Hours (or Semi-Annually)
- Replace fuel filters & water separators
- Inspect/clean crankcase breather
- Inspect turbocharger for free rotation & oil leakage
- Check cooling system hoses, pumps, clamps
- Oil & coolant samples (lab analysis for early detection)
- Inspect zinc anodes in heat exchangers; replace as needed
📍 805 Marine offers fluid analysis and complete cooling system inspections.
⏱ Every 1,000 Hours (or Annually)
- Inspect/clean aftercooler cores
- Test injectors & recalibrate if needed
- Flush & replace coolant if condition requires
- Check alignment of engine/gearbox/shaft
- Inspect & test electronic sensors (pressure, temp, speed)
- Inspect and clean electrical connections
⏱ Every 2,000 Hours
- Remove & service turbochargers
- Overhaul seawater pump (seals, bearings, impeller)
- Overhaul fuel injection pumps (bench test/calibration)
- Inspect valve lash & adjust as required
- Inspect vibration damper
- Inspect cylinder heads (pull if indicated by diagnostics)
⏱ Every 4,000–5,000 Hours (Major Overhaul)
- Full inspection of cylinder heads, valves, guides, injectors
- Replace piston rings, liners, bearings as required
- Inspect camshaft & crankshaft journals
- Replace major seals and gaskets
- Complete cooling system service (heat exchangers, oil coolers, aftercoolers removed & cleaned)
- Rebuild turbos if not already done
Local Service Coverage
Service Areas: Ventura • Oxnard • Channel Islands Harbor • Santa Barbara. Our mobile dockside service reduces downtime and logistics—ideal for commercial schedules and seasonal peaks.
Why Choose 805 Marine Mechanic?
- Certified Technicians: Diesel specialists experienced with Cat 3500-series platforms
- Genuine Parts: We use Caterpillar parts and high-quality fluids to preserve performance
- Customer-First: Clear timelines, thorough reporting, and preventive recommendations
- Mobile Support: On-site maintenance and emergency response (subject to availability)
Frequently Asked Questions
Do you service the Cat 3512C on-site?
Yes. We provide mobile, dockside service in Ventura, Oxnard, Channel Islands Harbor, and Santa Barbara, subject to marina access and scheduling.
Can you help diagnose fuel and air delivery issues?
Absolutely. We use electronic diagnostics and mechanical testing to troubleshoot injectors, pumps, sensors, turbochargers, and aftercooler systems.
What maintenance reduces unplanned downtime the most?
Staying current on oil/filter changes, seawater strainer cleaning, aftercooler service, and lab fluid analysis catches early wear before it becomes major.
Do you handle major overhauls?
Yes. We perform head work, liner/ring/bearing replacement, turbo rebuilds, and complete cooling-system service on 4,000–5,000-hour intervals.