CAT 3512 Marine Engine Maintenance Schedule: Complete Service Intervals & Parts Guide
The Caterpillar 3512 is one of the most popular high-speed marine diesel engines in the world, powering everything from offshore supply vessels and tugboats to fast ferries and mega yachts. Available in ratings from 1,000 to 2,250 BHP, the V12 configuration delivers an excellent power-to-weight ratio with proven reliability. Following Caterpillar's recommended maintenance schedule is essential for achieving the engine's designed service life of 20,000+ hours between major overhauls.
CAT 3512 Engine Specifications
| Parameter | Specification |
|-----------|---------------|
| Configuration | V-12, 4-stroke |
| Displacement | 58.6 litres (3,579 cu in) |
| Bore × Stroke | 170 × 215 mm |
| Power range | 746–1,678 kW (1,000–2,250 BHP) |
| Speed range | 1,200–1,800 rpm |
| Aspiration | Turbocharged & aftercooled |
| Fuel system | Electronic unit injection (EUI) |
| Dry weight | 6,537 kg (approx.) |
| Oil capacity | 284 litres |
| Coolant capacity | 121 litres |
Complete Maintenance Schedule
### Every 250 Hours (or monthly)
### Every 500 Hours (or quarterly)
### Every 1,000 Hours (or semi-annually)
### Every 2,000 Hours (or annually)
### Every 4,000 Hours - Top overhaul assessment — compression test all 12 cylinders - Overhaul turbocharger(s) if bearing play exceeds limits - Replace fuel transfer pump - Inspect camshaft lobes and followers - Full oil system flush if changing oil brand or type - Inspect all rubber hoses and replace if deteriorated ### Every 8,000 Hours - In-frame overhaul — replace cylinder liners, pistons, piston rings, and liner seals - Replace cylinder head gaskets - Inspect and recondition cylinder heads (valves, seats, guides) - Replace all gaskets and seals (upper gasket set) - Overhaul fuel injectors or replace with remanufactured units - Inspect connecting rod bearings ### Every 16,000–24,000 Hours - Major overhaul — all in-frame overhaul items plus: - Replace main and connecting rod bearing shells - Inspect and regrind crankshaft if necessary - Replace crankshaft seals (front and rear) - Overhaul oil and water pumps - Replace all drive belts, tensioners, and pulleys - Recondition or replace turbocharger(s) - Full engine alignment check
Essential Spare Parts to Stock
**High-frequency consumables (carry on board):**
**Overhaul parts (order in advance):**
**Emergency spares (recommended on board):**
CAT 3512 Performance Monitoring
Regular performance monitoring catches problems before they become failures:
Caterpillar's electronic engine management system (ADEM) provides diagnostic trouble codes via the CAT ET (Electronic Technician) software. Always read and clear DTCs during each service interval.
How MarineLink Solutions Can Help
We supply the complete range of CAT 3512 marine engine spare parts from routine filters and belts to complete in-frame and major overhaul kits. All parts are genuine Caterpillar or certified Reman (remanufactured) components with full warranty.
Provide your engine serial number and arrangement number to sales@marinelinksolutions.com and we'll quote the exact parts for your specific 3512 configuration — with fast worldwide delivery to any port.
Need Spare Parts?
MarineLink Solutions supplies genuine parts for all major marine engine brands. Contact us for a fast, competitive quote.
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