This CAT 3412 Marine Engine Assembly is delivered as a fully built, run-tested CAT Marine Engine power unit rated 550 kW (738 hp) at 1800 rpm. The 3412 is a 27.0 L V-12 turbocharged and aftercooled diesel platform, and every unit we supply is assembled with matched internal components, aligned and pressure checked before export packing. Buyers sourcing marine engine parts for repower, overhaul or fleet maintenance can take the complete assembly, or combine it with the individual diesel engine parts listed below — cylinder head and valve train, valve seat insert, piston and liner kit, bearings, gaskets, injectors, turbocharger, water pump and oil pump — from one single supplier.

Product Highlights

• Complete CAT 3412 Engine Assembly rated 550 kW at 1800 rpm for marine propulsion, auxiliary generator sets and excavator power packs.
• Valve train supplied with correctly seated valve seat insert, ground valves and lapped sealing faces for stable compression and low oil consumption.
• Full marine engine parts scope: cylinder head, valve seat insert, liner kit, piston ring set, bearings, gasket kit, injector, turbocharger, water pump and oil pump.
• OEM-equivalent diesel engine parts cross-referenced against original CAT Marine Engine part numbers for straightforward, error-free procurement.
• Every 3412 assembly is tested for compression, oil pressure, cooling circulation and fuel delivery before dispatch.
• Fast technical matching: send your engine serial number or CAT part number and we confirm the correct 3412 component for your vessel.

Technical Specification

Valve Seat Insert and Valve Train Service

Valve seat insert condition decides how well a 3412 marine engine holds compression, so every assembly we build uses a correctly specified valve seat insert in both intake and exhaust positions, matched to the valve face angle and pressed to the correct interference fit. The head is then vacuum leak tested, the valve lash is set to CAT specification and the injector seat is re-cut so the fuel nozzle sits perfectly in the head.

For customers running scheduled overhauls, the valve seat insert and valve guide are also available as separate marine engine parts, which keeps your 3412 service cost low without replacing the complete cylinder head. Tell us your engine arrangement number and we will confirm the matching valve seat insert, valve, guide and head gasket set in one quotation.

Reference CAT part numbers are listed in both of the two written forms used on original documentation, with and without the hyphen, so the assembly, valve seat insert and marine engine parts can be cross-checked quickly. Please confirm the exact number against your engine serial number before ordering.

What Is Included in the 3412 Engine Assembly

• V-12 cylinder block with crankshaft, camshaft and main bearings installed and torque checked.
• Two cylinder heads with valve seat insert, valves, springs, guides and covers fitted.
• Piston, liner and piston ring set for all twelve cylinders, matched by weight and clearance.
• Fuel system: injectors, injection pump and fuel transfer pump, calibrated on the test bench.
• Turbocharger, aftercooler core, water pump, oil pump, oil cooler and thermostat housing.
• Complete gasket and seal kit, front and rear crankshaft seals, flywheel housing and lifting eyes.

Application and Marine Engine Parts Range

The CAT 3412 marine engine assembly and the matching marine engine parts suit tugboats, fishing vessels, workboats, crew boats, cargo and passenger vessels, dredgers, barges and marine generator sets. Because the same 3412 platform is also used in heavy earthmoving equipment, many customers buy this assembly as an excavator engine replacement and take advantage of our shared stock of diesel engine parts. Whether you need a complete 550 kW power unit, a cylinder head with a new valve seat insert, or a full overhaul kit, we plan the parts list around your engine arrangement number.

Global B2B Supply

Guangzhou Pinxin Engine Co., Ltd. supplies CAT Marine Engine assemblies and diesel engine parts to importers, distributors, repair workshops, shipyards and fleet operators worldwide. We regularly ship 3412 engine assembly units and 3412 marine engine parts to buyers in Australia, Canada, Chile, Zambia, Congo, Nigeria, Ghana, Tanzania, Indonesia, Thailand, Malaysia, Zimbabwe, Brazil, South Africa, Saudi Arabia, Mozambique, Peru, Argentina, Vietnam and Kenya. Mixed containers, consolidated parts orders and repeat overhaul programmes are all supported, with export documentation prepared for each destination.

Why Buy From Guangzhou Pinxin Engine Co., Ltd.

• One-stop sourcing for 3412 engine assembly, valve seat insert and all matching marine engine parts.
• Experienced technical team confirming fitment by CAT part number and engine serial number.
• Stable monthly capacity to support fleet overhaul programmes and distributor stock.
• Export-grade packing with anti-rust protection and reinforced cases for long distance transport.
• Fast quotation turnaround for B2B enquiries, including mixed and sample orders.