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Porsche // 993 (911) (1994-1998) // 993 (911) TURBO S 1994-97
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- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
Larger than standard. 15% larger than the original for better cooling.
Fits:
Porsche 986 Boxster 1997-04 Tiptronic
Porsche 987 Boxster 2005-07 Tiptronic
Porsche 987C Cayman 2007-08 Tiptronic
Porsche 996 C2 / C4 >>2001 Tiptronic
Diagram ref no 1.
The installation of a larger gearbox oil cooler for the Porsche 996, specifically for the Automatic Transmission Fluid (ATF), offers several significant benefits:
Enhanced Cooling Efficiency: A larger oil cooler increases the cooling capacity, allowing the ATF to dissipate heat more effectively. As a result, the transmission can operate at lower temperatures, preventing overheating and reducing the risk of fluid breakdown and premature wear on transmission components.
Extended Transmission Life: Lower operating temperatures due to improved cooling help prolong the lifespan of the transmission. Cooler ATF ensures that the internal components experience less stress and thermal degradation, contributing to a longer-lasting and more reliable gearbox.
Improved Performance: Optimal transmission temperature is essential for consistent and smooth gear shifts. With a larger oil cooler, the ATF maintains its viscosity and performance characteristics, promoting seamless gear changes and overall improved transmission performance.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99630701701
The product you are viewing cross references to these numbers
- Porsche 911 1984-1986 3.2L
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
O-Ring Seal 18 x 2.5mm
Sold each
On Porsche 911 models from 1984–1986, it is used in the
gearbox oil cooler assembly. On Porsche 964 and 993 models, it is used for the
heater box water drain pipe.
Fits:
- Porsche 911 1984-1986 3.2L
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
Diagram Ref No 6 or 19
What Does It Do?
The O-ring creates a seal between adjoining components, helping prevent unwanted leakage.
In the gearbox oil cooler application, it helps maintain an oil-tight connection. In the heater box drain assembly, it helps seal the relevant drain pipe connection.
Why Does It Fail?
Common causes include:
- Rubber hardening with age
- Exposure to heat and temperature changes
- Compression and loss of elasticity
- Cracking or splitting
- Damage during removal or installation
When Should It Be Replaced?
Replace if the O-ring is brittle, flattened, cracked or damaged.
Replacement is recommended when dismantling the gearbox oil cooler connection or heater box water drain pipe, particularly where the original seal has deteriorated.
Checks & Installation
Inspect the sealing groove and mating surfaces for dirt, corrosion or damage.
Ensure the replacement O-ring is correctly seated without twisting or pinching. Check the connection for leaks after reassembly.
Key Features
- Replacement O-ring seal
- Dimensions: 18 x 2.5mm
- Fits Porsche 911 (1984–1986) gearbox oil cooler applications
- Fits Porsche 964 / 993 heater box water drain pipe applications
- Helps maintain leak-resistant connections
- Suitable for servicing and restoration
Porsche 911 / 964 / 993 Gearbox Oil Cooler & Heater Box Seals
The Porsche 911, 964 and 993 use rubber O-ring seals in various mechanical and drainage connections to maintain correct sealing and prevent unwanted leakage.
This 18 x 2.5mm O-ring is specifically used in the 1984–1986 Porsche 911 gearbox oil cooler and the heater box water drain pipe on Porsche 964 and 993 models.
Replacing deteriorated seals helps maintain reliable operation and prevent leaks during servicing or restoration.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99970714340
The product you are viewing cross references to these numbers