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- 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 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- 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 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche 955 Cayenne S 4.5L V8 2003-06
- Porsche 955 Cayenne Turbo 4.5L 2003-06
Fits:
Porsche 987 MKI Boxster 2005-08
Porsche 987C MKI Cayman 2006-08
Porsche 996 Carrera 1998-05
Porsche 996 Turbo 2001-05
Porsche 997 MKI Carrera 2005-08
Porsche 955 Cayenne S / Turbo 4.5L 2003-06
Click 'Zoom in' for large parts diagram.
Diagram Ref No 5.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610504172
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- 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
Hydraulic Tappet
Sold each - 12 required per car
Restore smooth and quiet valve train operation with this OE
Match Hydraulic Tappet, designed for the Porsche
993. Manufactured to original equipment specifications, this replacement
hydraulic tappet helps maintain correct valve clearance automatically, reducing
valve train noise and supporting consistent engine performance.
Fits:
- 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 25
Hydraulic tappets are an important part of the Porsche 993 valve train, helping the engine run smoothly without the need for regular manual valve clearance adjustment.
What Does the Hydraulic Tappet Do?
The hydraulic tappet, also known as a hydraulic valve lifter, sits within the valve train and uses engine oil pressure to maintain the correct clearance between moving valve components.
Its main functions include:
- Maintaining correct valve clearance automatically.
- Reducing valve train noise.
- Supporting smooth valve operation.
- Helping maintain efficient engine performance.
- Reducing wear on camshaft and valve train components.
- Compensating for thermal expansion as the engine warms up.
A correctly functioning hydraulic tappet helps ensure quiet, reliable and efficient engine operation.
Why Do Hydraulic Tappets Fail?
Hydraulic tappets operate under constant load and rely on
clean engine oil to function correctly. Common causes of failure include:
- Oil contamination or sludge build-up.
- Low oil pressure.
- Internal wear after high mileage.
- Blocked oil passages.
- Poor maintenance or extended oil change intervals.
- Engine overheating.
- Wear to internal check valves or plungers.
When a tappet can no longer maintain oil pressure correctly, it may collapse or become noisy, causing tapping sounds from the valve train.
When Should the Hydraulic Tappet Be Replaced?
Replacement is recommended if you notice:
- Persistent tappet ticking or tapping noise.
- Noisy valve train after warm-up.
- Rough running caused by poor valve operation.
- Loss of performance linked to valve train wear.
- Wear found during engine inspection.
- During cylinder head overhaul or engine rebuild.
Many Porsche specialists recommend replacing worn hydraulic tappets during major engine work to restore smooth operation and protect surrounding valve train components.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310514107
The product you are viewing cross references to these numbers
- 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
6 per engine. Sold each.
Fits:
Porsche 993 1994-98
Diagram ref no 22.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310508500
The product you are viewing cross references to these numbers
- 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
6 per engine. Sold each.
Fits:
Porsche 993 1994-98
Diagram ref no 23.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99310508600
The product you are viewing cross references to these numbers