Engine oil pump. Porsche 911 1977-89  ❭  91110700805

Oil Pump 

The Porsche 911 & 911 turbo Oil Pump is one of the most critical components within the engine's dry-sump lubrication system. Responsible for circulating oil throughout the engine, the oil pump ensures that vital moving components receive a continuous supply of lubricating oil, helping to minimise friction, control temperatures, and protect against premature engine wear.

Fits:

• Porsche 911 1974-1977 2.7L
• Porsche 911 1976-77 3.0 Carrera*
• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50
• Porsche 911 1975-1977 3.0L Turbo (930)*

*Requires extra part No. 93010190200 Lid

Diagram Ref No 1

Unlike conventional wet-sump systems, Porsche's legendary dry-sump design relies heavily on the oil pump to both supply pressurised oil to the engine and scavenge oil back to the external oil tank. This constant circulation is essential for maintaining stable oil pressure under all driving conditions, particularly in high-performance and turbocharged applications.

Whether you're rebuilding an engine, restoring a classic Porsche, or replacing worn internal components, the 91110700805 oil pump plays a crucial role in maintaining engine reliability and long-term performance.

What Does the Oil Pump Do?

The oil pump is the heart of the Porsche lubrication system. It draws oil from the oil tank and distributes it under pressure to critical engine components including:

• Crankshaft bearings
• Connecting rod bearings
• Camshafts and valve train components
• Pistons and cylinders
• Timing chains and associated components
• Turbocharger lubrication systems (where applicable)

The pump also scavenges used oil from the engine and returns it to the oil tank, ensuring continuous circulation throughout the dry-sump system.

A correctly functioning oil pump helps:

• Maintain stable oil pressure
• Reduce internal engine wear
• Support effective engine cooling
• Ensure reliable lubrication under high-performance driving
• Protect expensive engine components from damage

Why Does an Oil Pump Fail?

Although Porsche oil pumps are engineered for durability, wear can occur over time, especially in high-mileage engines or engines that have experienced poor maintenance.

Common causes of oil pump failure include:

• Internal gear wear
• Contamination from debris or metal particles
• Oil starvation events
• Poor maintenance history
• Engine overheating
• Excessive bearing material circulating through the oil system
• Damage following engine failure
• Wear to internal clearances reducing oil pressure

As oil pumps age, efficiency can decline, leading to reduced oil pressure and compromised lubrication performance.

When Should You Replace It?

Replacement should be considered whenever there are signs of oil pressure issues, excessive internal wear, or during major engine rebuild work.

Typical replacement scenarios include:

• Full engine rebuilds
• Low oil pressure diagnosis
• Internal engine failure repairs
• High-mileage engine restorations
•  Excessive wear found during engine inspection
• Metal contamination within the lubrication system
• Preventative replacement during performance engine builds

Because oil pump failure can lead to catastrophic engine damage, replacing a worn unit during rebuild work is often considered inexpensive insurance compared to the cost of a complete engine failure.