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Exhaust Valve Guide 1st Oversize. Porsche 993 1994-97 - 99310432172
99310432172/2
Vehicle Group
- 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
Information
Exhaust Valve Guide 1st Oversize.
Diagram Ref No 2
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310432172
The product you are viewing cross references to these numbers
The TRW 1st Oversize Exhaust Valve Guide is a precision replacement component designed for the cylinder head of Porsche 911 (993) models. The guide supports the exhaust valve stem and keeps the valve accurately aligned as it opens and closes, helping the valve seat correctly and maintain an effective combustion-chamber seal.
x6 Per Engine.
Price Is For Each.
- 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
Diagram Ref No 2
This 1st oversize version is intended for cylinder-head rebuilding where the original valve-guide bore has become worn or has been machined and a standard-size guide can no longer achieve the correct interference fit. Reference specifications list the guide as 8 x 13.26 mm. It is supplied individually, with six exhaust guides required for a complete engine.
- Supports and accurately guides the exhaust valve stem.
- Keeps the valve correctly aligned with its valve seat.
- Reduces excessive sideways movement and valve-stem wobble.
- Helps maintain effective cylinder sealing and compression.
- Assists with transferring heat from the exhaust valve stem into the cylinder head.
- Reduces abnormal loading and wear on the valve stem and valve seat.
- Provides an oversize external fit for cylinder heads requiring a 1st oversize guide.
- Helps restore correct valvetrain operation during a cylinder-head rebuild.
Correct valve guidance is particularly important on the exhaust side because exhaust valves and guides operate under very high thermal loads. Excessive clearance can prevent the valve from locating consistently against its seat and accelerate wear elsewhere in the cylinder head.
Symptoms Of Wear Or Failure:
A worn exhaust valve guide may cause:
- Blue or blue-grey exhaust smoke caused by oil entering the combustion chamber.
- Increased engine oil consumption.
- Excessive valve-stem play when inspected.
- Ticking or tapping noises from the cylinder head.
- Rough or uneven idle.
- Reduced engine performance or power.
- Poor or inconsistent compression.
- Engine misfires.
- Poor valve seating.
- Accelerated exhaust valve or valve-seat wear.
- Failed compression or leak-down test results.
As valve guides wear, their ability to accurately locate the valve against its seat decreases, which can compromise sealing and engine performance.
Why Replacement Matters:
- Exhaust valve guides are continually exposed to heat, friction and rapid valve movement. Over time, wear can increase the clearance between the valve stem and guide, allowing the valve to move laterally rather than travelling accurately along its intended path.
- Excessive valve movement can lead to poor valve seating, reduced compression, increased oil consumption and accelerated wear of the valve stem and valve seat. If left unresolved, the resulting wear can contribute to more extensive and expensive cylinder-head damage.
- Replacing worn guides restores controlled valve movement, supports consistent valve seating and helps protect the valve, valve seat and cylinder head. A correctly fitted guide also contributes to reliable compression, efficient exhaust-gas flow and long-term engine durability.
- The 1st oversize specification is especially important during cylinder-head refurbishment where the original guide bore has worn or been machined beyond standard dimensions. Using the correctly sized oversize guide allows the required secure fit to be restored.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310432172
99310432171
99310432172
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Price: €61.64
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Information
Oil stem seal. 24 per engine. Price is for each.
Fits:
Porsche 986 Boxster(24 per car)
Porsche 987.1 Boxster(24 per car)
Porsche 987.2 Boxster(24 per car)
Porsche 981 Boxster (24 per car)
Porsche 982 Boxster 2.0L / 2.5L (16 per car)
Porsche 987C.1 Cayman(24 per car)
Porsche 987C.2 Cayman(24 per car)
Porsche 981C Cayman (24 per car)
Porsche 982C Cayman 2.0L / 2.5L (16 per car)
Porsche 996 1998-05
Porsche 997.1 2005-08
Porsche 997.2 2009-12
Porsche 991.1 2012-16 (24 per car)
Porsche 991.2 2017-19 (24 per car)
Porsche 992.1 2019>> (24 per car)
Porsche Cayenne 955 2003-06 3.2L V6 (24 per car)
Porsche Cayenne 955 2003-06 4.5L V8 (32 per car)
Porsche Cayenne 957 2007-10 3.6L V6 (24 per car)
Porsche Cayenne 957 2007-10 4.8L V8 (32 per car)
Porsche Cayenne 92A 2011-18 3.6L V6 (24 per car)
Porsche Cayenne 92A Turbo / Turbo S 2011-18 4.8L V8 (32 per car)
Porsche Cayenne 9YA 2018>> 2.9l / 3.0L V6 (12 per car)
Porsche Cayenne 92A Turbo / Turbo S 2011-18 4.8L V8 (32 per car)
Porsche Macan MKI 2.0L V4 (16 per car)
Porsche Macan MKI S 3.0L V6 (24 per car)
Porsche Macan MKI Turbo 3.6L V6 (24 per car)
Porsche Macan MKII 2.0L V4 (16 per car)
Porsche Macan MKII 2.9L / 3.0L V6 (12 per car)
Porsche Panamera 970 3.0L V6 Diesel (24 per car)
Porsche Panamera 970 3.6L V6 (24 per car)
Porsche Panamera 970 4.8L V8 (32 per car)
Porsche Panamera 971 2.9L / 3.0L V6 (12 per car)
Porsche Panamera 971 4.0L V8 Diesel (32 per car)
Porsche Carrera GT V10 (40 per car)
Click 'Zoom in' for large parts diagram.
Diagram ref no 10
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95510567500
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Porsche 991.2 2017-19 (24 per car)
Porsche 992.1 2019>> (24 per car)
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Porsche Cayenne 955 2003-06 4.5L V8 (32 per car)
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Porsche Cayenne 957 2007-10 4.8L V8 (32 per car)
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Porsche Macan MKI 2.0L V4 (16 per car)
Porsche Macan MKI S 3.0L V6 (24 per car)
Porsche Macan MKI Turbo 3.6L V6 (24 per car)
Porsche Macan MKII 2.0L V4 (16 per car)
Porsche Macan MKII 2.9L / 3.0L V6 (12 per car)
Porsche Panamera 970 3.0L V6 Diesel (24 per car)
Porsche Panamera 970 3.6L V6 (24 per car)
Porsche Panamera 970 4.8L V8 (32 per car)
Porsche Panamera 971 2.9L / 3.0L V6 (12 per car)
Porsche Panamera 971 4.0L V8 Diesel (32 per car)
Porsche Carrera GT V10 (40 per car)
Click 'Zoom in' for large parts diagram.
Diagram ref no 10
Related reference numbers
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1111352900
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Price: €36.52
In stock
Vehicle Group
- Porsche Boxster 986 2.5L 1997-99
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
Information
Valve spring.
Fits:
Porsche 986 Boxster 2.5L
Porsche 996 3.4L
Click 'Zoom in' for large parts diagram.
Diagram ref no 12.
Related reference numbers
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Fits:
Porsche 986 Boxster 2.5L
Porsche 996 3.4L
Click 'Zoom in' for large parts diagram.
Diagram ref no 12.
Related reference numbers
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Vehicle Group
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster 987 2.7L 2005-08/08
Information
Engine Cylinder Head Inlet Valve.
The OE Match Engine Cylinder Head Inlet Valve is a high-quality replacement valvetrain component designed to regulate the flow of air and fuel into the engine's combustion chamber. Manufactured to OE specifications for fit, precision and durability, this inlet valve is essential for maintaining efficient engine breathing, combustion performance and long-term engine reliability.
Sold Each.
X12 Required Per Car.
Fits:
Diagram Ref No 8
Produced from premium-grade, heat-resistant materials, the inlet valve is engineered to withstand the constant mechanical loads and high operating temperatures associated with modern engine operation. Working in conjunction with the camshaft, valve springs, valve guides and cylinder head assembly, it ensures precise control of intake airflow, helping the engine deliver optimal power, fuel efficiency and responsiveness.
What This Product Does:
Symptoms Of Wear Or Failure:
Why Replacement Matters:
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The OE Match Engine Cylinder Head Inlet Valve is a high-quality replacement valvetrain component designed to regulate the flow of air and fuel into the engine's combustion chamber. Manufactured to OE specifications for fit, precision and durability, this inlet valve is essential for maintaining efficient engine breathing, combustion performance and long-term engine reliability.
Sold Each.
X12 Required Per Car.
Fits:
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster 987 2.7L 2005-08/08
Diagram Ref No 8
Produced from premium-grade, heat-resistant materials, the inlet valve is engineered to withstand the constant mechanical loads and high operating temperatures associated with modern engine operation. Working in conjunction with the camshaft, valve springs, valve guides and cylinder head assembly, it ensures precise control of intake airflow, helping the engine deliver optimal power, fuel efficiency and responsiveness.
What This Product Does:
- Controls the intake of air and fuel into the combustion chamber.
- Opens and closes in precise timing with engine operation.
- Maintains an effective seal during compression and combustion cycles.
- Supports efficient airflow and engine breathing.
- Helps maximise engine performance and throttle response.
- Contributes to fuel efficiency and emissions control.
- Forms a critical part of the engine valvetrain system.
Symptoms Of Wear Or Failure:
- Loss of engine power and performance.
- Rough idle or uneven engine running.
- Engine misfires.
- Poor throttle response and acceleration.
- Increased fuel consumption.
- Low compression in the affected cylinder.
- Difficulty starting the engine.
- Ticking or tapping noises from the cylinder head.
- Engine management warning lights or fault codes.
- Failed compression or leak-down test results.
Why Replacement Matters:
- Inlet valves are subjected to continuous opening and closing cycles while being exposed to heat, combustion by-products and airflow turbulence. Over time, valves can become worn, bent, burnt, carbon-contaminated or develop sealing issues that negatively affect engine efficiency and performance.
- A damaged inlet valve can restrict airflow into the combustion chamber, resulting in poor combustion, reduced power output and increased fuel consumption. If left unresolved, valve-related problems can contribute to compression loss and may cause additional wear to valve seats, cylinder heads and other internal engine components.
- Replacing a worn or damaged inlet valve restores proper airflow, improves combustion efficiency and helps maintain optimal engine performance. An OE Match replacement provides factory-style fitment, precision manufacturing and long-term durability, ensuring reliable operation and helping protect your Porsche engine from premature wear and costly repairs.
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