Seal ring Genuine Porsche part 91160210201

Rotor Arm for Marelli Distributor



Fits:
Porsche911 2.4L 1965-73

The "rotor" head is attached to the top of the distributor shaft which is driven by a gear on the engine's camshaft and thus synchronized to it. This rotor is pressed against a carbon brush on the center terminal of the distributor cap which connects to the ignition coil either through the top and wired directly to the coil in HEI systems, or via the center terminal in points ignition systems and remotely connected to the coil.

The rotor is constructed such that the center tab is electrically connected to its outer edge so that voltage coming in to the center post travels through the carbon point to the outer edge of the rotor. As the camshaft rotates, the rotor spins and its outer edge passes each of the internal plug terminals to fire each spark plug.

Related reference numbers
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91160210400

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Distributor o-ring.



Fits:
Porsche 911 1970-89
Porsche 911 (930) Turbo 1975-89
Porsche 964 1989-94 all models
Porsche 993 1995-98 all models

Click 'Zoom in' for large parts diagram.
Diagram ref no 4

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91160210201

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This kit is to build 911 distributors in the 169 range, this kit builds a 911E.



Fits:
Porsche 911 E 1971 - 1973

To confirm there is a Bosch number stamped on to your distributor.
0231 169 003
0231 169 004
0231 169 005
0231 169 008
0231 169 009
0231 169 010

This is a kit containing a new sliding plate, weight washers, various size shims to get the up and down play to .01 to .05 of a mm, a brass top shim, new advance primary and secondary spring with a new shaft pin and O-ring. Fresh hardware, cap, 6500 RPM rotor, Points and wicking felt.
This kit is meant for the professional with skill and understanding of the distributor function, having a distributor machine to run up the distributor before installation is a must.

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91160216998E

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This kit is to build 911 distributors in the 169 range, this kit builds a 911S



Fits:
Porsche 911 S

To confirm there is a Bosch number stamped on to your distributor.
0231 169 003
0231 169 004
0231 169 005
0231 169 008
0231 169 009
0231 169 010

This is a kit containing a new sliding plate, weight washers, various size shims to get the up and down play to .01 to .05 of a mm, a brass top shim, new advance primary and secondary spring with a new shaft pin and O-ring. Fresh hardware, cap, 6500 RPM rotor, Points and wicking felt.
This kit is meant for the professional with skill and understanding of the distributor function, having a distributor machine to run up the distributor before installation is a must.

Related reference numbers
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91160216998S

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This kit is to build 911 distributors in the 169 range, this kit builds a 911 T



Fitment:
Porsche 911 T 1971-73

To confirm there is a Bosch number stamped on to your distributor.
0231 169 003
0231 169 004
0231 169 005
0231 169 008
0231 169 009
0231 169 010

This is a kit containing a new sliding plate, weight washers, various size shims to get the up and down play to .01 to .05 of a mm, a brass top shim, new advance primary and secondary spring with a new shaft pin and O-ring. Fresh hardware, cap, 6500 RPM rotor, Points and wicking felt.
This kit is meant for the professional with skill and understanding of the distributor function, having a distributor machine to run up the distributor before installation is a must.

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

91160216998T

The product you are viewing cross references to these numbers

Distributor o-ring.



Fits:
Porsche 911 1970-89
Porsche 911 (930) Turbo 1975-89
Porsche 964 1989-94 all models
Porsche 993 1995-98 all models

Click 'Zoom in' for large parts diagram.
Diagram ref no 4

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91160210201

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Distributor Block-Off & Conversion Kits for Classic Porsche 911
The Distributor Plug Kit for classic Porsche 911 covers the precise scenario where the engine’s original distributor hole is no longer used—often when converting to coil-on-plug ignition or eliminating the mechanical distributor altogether.

Fits:

• 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 911 1978-1989 3.3L Turbo (930)

Blanks off distributor hole in crankcase, highlighted in green

This high-quality kit is CNC-machined from aluminium, anodised silver, and features dual O-ring seals to ensure a secure, leak-free block-off of the distributor housing. It also incorporates a threaded pulling hole so the plug can be removed easily if future service is required. The result: a clean, visually refined engine bay appearance and a reliable closure of the distributor port, preserving oil-tight integrity and engine performance.

What the product is:
A plug kit designed specifically for the distributor bore in classic Porsche 911 engines. CNC-machined aluminium block-off plug, enhanced sealing (double O-rings), and serviceable pull-thread.

What it does:

• Seals the distributor aperture when the mechanical distributor has been removed or bypassed.
• Maintains crankcase oil integrity, prevents leaks and contamination ingress.
• Enhances engine bay aesthetics by replacing the open distributor hole with a tailored, polished plug.

Why the original part or configuration fails / needs attention:
When a distributor is removed (for example during coil-on-plug conversion), the hole becomes an unsealed opening—risking oil leakage, contamination ingress (dirt, moisture), crankcase pressure loss, or aesthetic degradation. Older distributor seals and housings may become warped, cracked or worn with age, causing leaks or reduced reliability.

Why this plug kit should be installed / replaced:

• Prevents oil leaks and contamination by securely sealing the engine block in the absence of a distributor.
• Improves engine bay appearance and presents a quality finish.
• Provides a service-friendly solution (threaded pull hole) versus a crude blanking plate or crude cap.
• If you’re converting away from a distributor or refurbishing the engine, installing this kit is a simple, low-cost upgrade to protect longevity and maintain engine integrity.
  

For enthusiasts of the classic Porsche 911 who are performing engine conversions, refurbishments, or upgrades, the Distributor Plug & Block-Off Kit category is essential. These kits are designed for scenarios where the factory mechanical distributor is removed—commonly in coil-on-plug conversions, performance builds, or restoration projects.

What these components do:

• Securely blank off the distributor aperture to maintain crankcase integrity.
• Prevent oil and vacuum/pressure leakage from the engine block.
• Ensure that modifications (such as eliminating the distributor) do not compromise engine performance or reliability.
• Provide a finished, professional engine bay look—no open holes, no unsealed ports, and no risk of contamination.

Why you should replace or install proper kits now:

• Restores or maintains crankcase seal integrity, protecting engine internals from oil and debris.
• Helps maintain correct engine pressure and lubrication environment for optimal performance.
• Minimises risk of leaks, contamination, and subsequent engine damage—especially critical on high-value classic Porsche engines.
• Enhances presentation and value of the engine bay for restoration, show or performance builds.
• Using a quality kit from Design911 ensures you’re installing parts that meet or exceed the factory fit and finish—and are tailored for your classic Porsche 911.

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AMS9050165

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