BCBC M178 Engine Oil Pump

Engine Oil Pump Overview

The Melling M178 engine oil pump is a standard replacement pump built for dependable oil pressure and efficient circulation. It uses rotary pump design, precision-machined gears, and individually tested flow and pressure performance for consistent operation.

Key Features

• Standard replacement engine oil pump for service applications
• Rotary design with gear and gerotor technology
• Aluminum housing and cover with rust-preventative finish
• Powdered metal rotor construction for wear resistance
• Includes gasket, seal, O-ring, and pump cover
• Crankshaft-driven design with standard pressure and standard volume output

Detailed Description

Built under the Melling Stock line, the M178 is engineered for consistent oil delivery in engines that require a standard replacement pump. Close-tolerance machining helps maintain proper pressure, while precision-ground end plates support efficient pump operation and wear resistance. The aluminum housing and cover, combined with a rust-preventative finish, add durability in demanding engine environments. This part cross-references DNJ OP290 and EM-178 for the same application. Fits 1988-1995 Honda Civic, N/A. Fits 1993-1995 Honda Civic del Sol, N/A. Fits 1988-1991 Honda CRX, N/A. The M178 is a fitment-based replacement for Honda Civic, Honda Civic del Sol, and Honda CRX applications that call for this oil pump configuration.

What It Is Used For

• Restoring proper engine oil pressure
• Replacing a worn or failing oil pump
• Supporting consistent oil circulation through the engine
• Addressing pressure loss caused by internal pump wear
• Replacing a pump with standard pressure and standard volume requirements

Installation Notes and Tips

Verify engine application and pump configuration before installation. Confirm gasket, seal, and O-ring placement during assembly, and inspect the mounting surface for cleanliness and flatness. The pump uses a crankshaft drive and four mounting holes, so alignment should be checked carefully during service.

Quality Assurance

Melling tests each oil pump for pressure and flow under conditions that simulate actual engine operation. The M178 is assembled to production standards using high-quality materials for consistent service performance.