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Porsche // 911 & 912 (1965-1989) // 911 1974-1977 2.7L / 1976-77 3.0 Carrera
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- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
This OE match tandem oil pump is a direct replacement for the original Porsche component fitted to selected 987 Boxster, 987 Cayman, and 997.1 Carrera models equipped with M96/M97 flat-six engines. The tandem oil pump circulates engine oil through the lubrication system while also supporting vacuum functions within the engine. It helps maintain proper oil pressure, lubrication, and engine reliability under all operating conditions.
Fits:
Porsche 987 Boxster / Boxster S 2005 - 2008
Porsche 987C Cayman / Cayman S 2006 - 2008
Porsche 997.1 C2 / C4 / C2S 2005 - 2008 Cabrio/Coupe
Diagram ref no 35.
Supersedes / cross references: 99710702201, 99710702202, 99710702203, 99710702204,
Installed within the engine lubrication system, the tandem pump combines oil scavenging and vacuum pump functions into a compact assembly. It helps circulate engine oil through critical lubrication passages while also supporting crankcase ventilation and vacuum-related engine systems. The pump is particularly important for maintaining oil pressure and preventing oil starvation during spirited driving or high engine loads.
Function
• Circulates engine oil through lubrication system
• Maintains correct engine oil pressure
• Supports oil scavenging and crankcase vacuum functions
• Protects internal engine components from oil starvation
• Ensures reliable lubrication under high engine loads
A worn or failing tandem oil pump can lead to low oil pressure, inadequate lubrication, engine noise, or severe engine damage caused by oil starvation. Internal wear or pressure loss may also affect vacuum system operation and overall engine efficiency. Replacing the pump restores correct oil circulation and helps protect critical engine components from premature wear.
When to replace
• Low or fluctuating oil pressure
• Oil pressure warning light illuminated
• Unusual engine noise or ticking
• During engine rebuild or lubrication system service
• Evidence of internal oil pump wear or contamination
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710702205
The product you are viewing cross references to these numbers
- Porsche 911 1974-1977 2.7L / 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)
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.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91110700805
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 914 (1970-1976)
Fits:
Porsche 911 1965-73
Porsche 911 2.7L S 1974-75
Porsche 911 2.7L 911/83 Engine 1976
Porsche 914-6 1970-76
Click picture for large parts diagram.
Diagram Ref No 1.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90110700206
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 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)
- Porsche 914 (1970-1976)
Fits:
Porsche 911 1965-89
Porsche 930 3.0L Turbo 1975-77
Porsche 914-6 1970-76
Click 'Zoom in' for large parts diagram.
Diagram ref no 6
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90110712100
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1975-1977 3.0L Turbo (930)
Oil pump tab washer designed to secure and lock the oil pump fastener on classic Porsche engines. Although small, this locking washer plays a critical role in preventing oil pump hardware from loosening due to engine vibration and repeated heat cycles.
Fits:
Porsche 911 1965 - 1986
Porsche 911 Turbo 1975 - 1977
Porsche 914 1970 - 1976
Diagram ref no 4
By acting as a mechanical locking device, it helps keep the oil pump firmly in position, supporting stable oil pressure and reliable engine lubrication. Proper retention of the oil pump is essential for long-term engine protection and performance.
Tab washers are intended to be bent into place once. Reusing a previously bent washer can cause metal fatigue and reduced holding strength, increasing the risk of fasteners backing out. Replacing the washer during service is a simple, low-cost way to safeguard engine reliability and prevent premature wear.
When to replace:
• During oil pump removal, refit, or engine rebuild
• If the washer tab has been previously bent or straightened
• When cracking, distortion, or fatigue is visible
• Any time oil pump fasteners are loosened during maintenance
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99903900100
The product you are viewing cross references to these numbers