BCBC M155 Engine Oil Pump

Engine Oil Pump Overview

The Melling M155 is a standard replacement engine oil pump built for applications that require a 3/4-inch screen inlet and stock-style operation. It is made in the USA and engineered for dependable oil pressure control in a wide range of Chevrolet, GMC, and related GM vehicles.

Key Features

• Standard replacement oil pump with gear-type construction
• Steel gears and cast iron housing for durable operation
• Spur gear design with standard pressure and standard volume output
• Precision-machined gears and ground end plates for efficient pump action
• Individually tested for pressure and flow under operating conditions
• 3/4-inch inlet and stock application fitment

Detailed Description

The M155 oil pump is engineered for stock replacement use where consistent oil delivery is critical. Melling uses close-tolerance machining, precision-ground end plates, and modern gear and gerotor technology to support proper engine pressure and efficient pumping. The cast iron housing and cover, steel gears, and rust-preventative finish add durability for long-term service. This part cross-references Sealed Power (e.g., 224-43469) and DNJ (e.g., OP3104) for the same application. Fits 1996-2014 Chevrolet Express 1500, N/A; Fits 1999-2013 Chevrolet Silverado 1500, N/A; Fits 1993-1999 Chevrolet C1500, N/A; Fits 1993-1997 Chevrolet Camaro, N/A; Fits 1993-2000 GMC Yukon, N/A.

What It Helps Address

• Low or unstable engine oil pressure
• Worn or inefficient stock oil pump operation
• Oil delivery issues caused by internal pump wear
• Restoration work requiring a standard replacement oil pump
• Service needs on GM V8 and truck applications with a 3/4-inch screen inlet

Installation Notes and Tips

Verify the 3/4-inch screen inlet requirement and stock application details before installation. Confirm the pump drive arrangement, mounting hole pattern, and pickup tube dimensions against the original part. This pump does not include a gasket or seal, drive shaft, or pickup screen.

Quality Assurance

Melling manufactures this oil pump in the USA and tests each unit for pressure and flow to verify operation under conditions that duplicate actual engine use. The M155 is built to Melling's production standards for standard replacement service.