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Porsche > 993 (911) (1994-1998) > 993 (911) C2 1994-97 > Engine Rebuild Parts > Rocker Arms & Tappets >

Rocker arm shaft seal. Porsche 911 / 930 / 964 / 914-6  ❭  91109910352

Rocker arm shaft seal. Porsche 911 / 930 / 964 / 914-6 - 91109910352 - 1611550100, URO-013109
2
Check vehicle fitment
91109910352/1
Product Information
Product Information
Rocker arm shaft seal
The rocker arm shaft seal helps prevent engine oil leakage around the rocker arm shaft bore. A good seal supports correct valve train lubrication retention, reduces oil seepage from the camshaft housing area, and helps keep the engine clean and properly sealed.
Sold individually, 24 required per vehicle

Fits:
Porsche 911 1965 - 1989
Porsche 930 Turbo 1974 - 1989
Porsche 914-6 1970-72
Porsche 964 C2 / C4 1989-1994
Porsche 964 Carrera RS 3.6L 1992
Porsche 964 Turbo 3.6L 1993-94

Fits to number 25 on diagram.

This OE Match rocker arm shaft seal is designed to match the original-style fitment and help seal the rocker arm shaft area within the valve train assembly.

Functions
•  Replaces the rocker arm shaft seal
•  Helps seal the rocker arm shaft area
•  Helps prevent oil leaks from the camshaft housing / rocker area
•  Supports correct valve train oil control
•  Suitable for rocker arm shaft removal, refitting, or engine resealing
•  Replaces hardened, flattened, split, missing, or leaking original seals
•   OE Match replacement for classic Porsche engine repair and restoration.

Why Replace This Part?
Rocker arm shaft seals can harden, flatten, crack, split, or lose sealing ability due to heat, oil exposure, age, and repeated engine service. A worn or missing seal can allow oil to seep from the rocker shaft area, causing oil staining, drips, burning oil smells, or contamination around the camshaft housing. Replacing the seal helps restore a clean and reliable engine oil seal.

When to Replace This Part
•   Oil leaks are visible around the rocker arm shaft area
•   The rocker arm shafts have been removed or adjusted
•   Camshaft housing or valve train service is being carried out
•   The original seal is hard, split, flattened, or missing
•   Engine oil seepage is present after previous repairs
•   The engine is being rebuilt, resealed, or restored
•   Preventative replacement is being carried out during top-end service.

Where it fits on the car
This seal fits at the rocker arm shaft / camshaft housing area on Porsche 911, 930, 964, and 914-6 engines. It forms part of the upper engine valve train sealing system.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

91109910352
91109910352

The product you are viewing cross references to these numbers
Related products
Hydraulic valve tappet. Porsche 993 Carrera / 993 Carrera RS - 99310514105, 99310514107 - 420005210, 18709, 21701, 21699
2
Hydraulic valve tappet. Porsche 993 Carrera / 993 Carrera RS
99310514107/1
Product Information
Product Information

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
99310514105
99310514107

The product you are viewing cross references to these numbers
Rocker arm shaft. Porsche 993 - 99310534206
3
Rocker arm shaft. Porsche 993
Special Order item
99310534206
Product Information
Product Information
Rocker arm shaft.

porsche

Fits:
Porsche 993 1994-98

Click 'Zoom in' for large parts diagram.
Diagram ref no 24

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99310534206
99310534206

The product you are viewing cross references to these numbers
Rocker arm inlet. Porsche 993 1994-98 - 313096880322, 313 09 688 03 22, 99310508500, 99310508526
3
Rocker arm inlet. Porsche 993 1994-98
99310508500/1
Product Information
Product Information
Rocker arm INLET.
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
313096880322
313 09 688 03 22
99310508500
99310508526

The product you are viewing cross references to these numbers