Gearbox Casing / Casing Parts

Main shaft seal, 23 x 40 x 10

Fits:
Porsche 911 1972-73 (TYP 915) upto:
G >> 733 7374
G >> 723 0507
G >> 783 0830
Porsche 911 Carrera 1974-86

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Diagram ref no 13

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99911318241

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Main shaft seal, 23 x 40 x 10.

Fits:
Porsche 911 1972-73 (TYP 915) upto:
G >> 733 7374
G >> 723 0507
G >> 783 0830
Porsche 911 Carrera 1974-86

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Diagram ref no 13

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99911318241

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Main shaft seal

Fits:
Porsche 911 1972-73 (TYP 915) from:
G 733 7575 >>
G 723 0507 >>
G 783 0838 >>
Porsche 911 Carrera 1973-86

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Diagram ref no 13

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99911332740

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Main shaft seal,  23 x 35 x 8/11.
A rubber shaft oil seal (radial seal) for the main/input shaft of a 901/915-series gearbox. It fits around the rotating shaft and seals the interface between the rotating shaft and the gearbox housing to prevent gearbox oil leaks.
Dimensions: 23 mm (shaft diameter) × 35 mm (outer diameter) × 8/11 mm thickness (seal housing/dual-lip design).

Fits:
Porsche 911 1972 - 1973 (TYP 915) from:
G 733 7575 >>
G 723 0507 >>
G 783 0838 >>
Porsche 911 Carrera 1973 - 1986

Diagram ref no 11

This seal prevents gearbox oil from escaping around the input or main shaft, ensuring the transmission remains properly lubricated. It also blocks dirt, water, and other contaminants from entering the gearbox, helping preserve internal components and maintain correct operating pressure. By replacing a worn, hardened, or cracked original seal, it restores a clean, leak-tight barrier for reliable long-term gearbox performance.

Original gearbox seals degrade over time: rubber lips harden or crack, springs lose tension, and sealing surfaces wear. A failing main-shaft seal typically leads to:
• Gearbox oil leaks
• Loss of gearbox oil over time (low oil level)
• Contamination ingress (dirt, water), leading to accelerated gearbox wear or internal damage
• Messy drip underneath the car and gearbox housing

Replacing the seal with a correct-spec new unit restores proper sealing, preserves gearbox oil integrity, and helps prevent costly internal damage or gearbox failure.

You should replace this seal if:
• Gearbox oil leaks are visible around the input shaft or bellhousing area
• There is seepage, oil dripping, or a film of oil on the underside of gearbox or clutch area
• The old seal appears cracked, hardened, or visibly damaged
• You are doing a gearbox rebuild, overhaul or maintenance
• You notice loss of gearbox oil or suspect contamination ingress

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99911332740

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Gear Selector Shaft Oil Seal

OE Match gear selector shaft oil seal for classic Porsche 911 and 912 manual gearboxes. Designed to replace a worn or leaking original seal, this component helps prevent transmission oil from escaping around the gear selector shaft where it passes through the gearbox housing.

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 1975-1977 3.0L Turbo (930)
Porsche 911 1978-1989 3.3L Turbo (930)
Porsche 912E 4CYL 1976

Diagram ref no 8

The seal provides a barrier between the moving selector shaft and gearbox casing, helping retain the correct transmission oil level and protecting the surrounding components from oil contamination.

What Does the Gear Selector Shaft Oil Seal Do?

The gear selector shaft transfers movement from the gear lever linkage into the gearbox, allowing the driver to select different gears.

The oil seal fits around this shaft and prevents gearbox oil from escaping while allowing the shaft to move during gear changes. A properly functioning seal helps maintain the transmission oil level and keeps the gearbox exterior clean and dry.

Why Does It Fail?

Over time, the sealing material can harden, shrink or lose flexibility due to age, heat and prolonged contact with transmission oil.

Common causes of failure include:

• Age-related deterioration of the sealing lip
• Hardened or cracked rubber
• Wear from repeated selector shaft movement
• Corrosion or damage to the shaft sealing surface
• Incorrect installation or previous gearbox repairs
• Excessive shaft movement or wear

As the seal deteriorates, transmission oil may begin to seep around the selector shaft.

When Should It Be Replaced?

A replacement may be required if you notice:

• Gearbox oil leaking around the selector shaft
• Oil collecting on the underside of the transmission
• Drips beneath the gearbox
• A persistent oily residue around the selector linkage
• A damaged or hardened seal during gearbox servicing

The seal should also be inspected whenever the gearbox selector mechanism is dismantled or the transmission is removed for restoration.

Checks During Replacement

Before fitting a new oil seal, inspect the selector shaft for corrosion, scoring or excessive movement. Check the gearbox breather and surrounding seals to ensure the leak has been correctly identified.

The new seal should be installed squarely and to the correct depth, without damaging the sealing lip or shaft surface.

Porsche 911 / 912 Gearbox Oil Seals & Transmission Components

Gearbox oil seals are essential for maintaining the correct lubrication of classic Porsche manual transmissions. The gear selector shaft oil seal prevents transmission oil from leaking where the selector shaft enters the gearbox housing.

On older Porsche 911 and 912 models, ageing seals can become brittle or worn, allowing gearbox oil to escape. Replacing a leaking seal helps protect the transmission against lubricant loss and prevents oil contamination around the gear linkage and gearbox casing.

OE Match seal is a 15 × 24 × 7 mm replacement selector shaft oil seal for selected Porsche 911, 912 and 930 Turbo manual gearboxes. It is particularly suitable for maintenance and restoration of classic Porsche transmissions. 

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99911318541

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Radial shaft seal. 45 x 68 x 10 mm.

Fits:
Porsche 911 1972-86
Porsche 930 Turbo 1975-89
Porsche 914-6 1970-76
Porsche 924 Carrera GT 1981
Porsche 924 Turbo 1979-84

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Diagram ref no 16

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PCG113183A

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Radial shaft seal. 45 x 68 x 10 mm.

Fits:
Porsche 911 1972-86
Porsche 930 Turbo 1975-89
Porsche 914-6 1970-76
Porsche 924 Carrera GT 1981
Porsche 924 Turbo 1979-84

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Diagram ref no 16

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PCG113183A

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Throttle bell crank support rod.

Fits:
Porsche 356B / 356C 1960-65
Porsche 911 1965-89
Porsche 914-6 / 914-6:SPM 1970-76

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91430130701

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Throttle bell crank support rod.

Fits:
Porsche 356B / 356C 1960-65
Porsche 911 1965-89
Porsche 914-6 / 914-6:SPM 1970-76

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Diagram ref no 13

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91430130701

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Transmission Casing Pipe / Tube. 

The Genuine Porsche Transmission Casing Pipe / Tube (Part Number: 91530113303) is an original equipment transmission component associated with the gearbox casing and internal oil system of selected classic Porsche 911 and 930 models.

Fits:

• 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 1975-1977 3.0L Turbo (930)
• Porsche 911 1978-1989 3.3L Turbo (930)  

Diagram Ref No 10

Also referred to as a gearbox oil tube, transmission casing pipe or internal transmission oil pipe, this component forms part of the transmission housing assembly.

The Porsche 915 manual gearbox uses transmission oil to lubricate its gears, bearings, shafts and other moving components. Maintaining the intended oil distribution within the transmission is essential for reliable operation and long-term mechanical protection.

The transmission casing pipe forms part of the original internal gearbox arrangement and is intended to provide an oil passage at its designated location.

Manufactured to Porsche's original equipment specification, the pipe is designed to match the corresponding transmission casing configuration.

The component is associated with classic Porsche manual transmissions, particularly the 915 gearbox family, and is listed by specialist suppliers for selected 915 and 930 gearbox applications.

During normal operation, a manual transmission experiences continuous rotational movement, changes in torque and considerable mechanical loading.

Transmission oil provides lubrication between contacting components, reducing friction and helping manage heat generated during operation.

A correctly installed oil tube helps preserve the original gearbox oil-routing arrangement.

Although this is a relatively small and durable component, it may become damaged through corrosion, contamination, mechanical stress, incorrect installation or improper handling during gearbox rebuilding.

A bent, cracked, obstructed or incorrectly positioned tube may interfere with the internal oil passage it is intended to provide.

Replacing a damaged transmission casing pipe with a Genuine Porsche component helps restore the specified gearbox assembly configuration and supports reliable transmission lubrication.

Ideal for Porsche 915 gearbox rebuilding, transmission casing repairs and classic Porsche restoration, this Genuine Porsche Transmission Casing Pipe provides an original equipment replacement for compatible applications.

What This Product Does:
The transmission casing pipe is a component associated with the gearbox's internal oil system.

Its primary function is to maintain the intended oil passage within the corresponding gearbox casing assembly.

The Porsche 915 transmission relies on the correct quantity and specification of gearbox oil to lubricate the internal moving components.

As the transmission operates, its gears and shafts rotate under load, generating friction and heat.

Oil is distributed within the gearbox through the transmission's designed lubrication arrangement.

The casing pipe forms part of that arrangement at its specified location.

Its functions include:

• Providing an internal oil passage: Forms part of the designated gearbox oil-routing arrangement.
• Supporting transmission lubrication: Helps maintain the original configuration used for gearbox oil distribution.
• Maintaining correct oil flow routing: Provides the intended passage within the compatible transmission casing.
• Supporting gearbox reliability: Helps preserve the lubrication arrangements required by the transmission.
• Maintaining original transmission construction: Restores the specified Porsche casing component.
• Supporting gearbox refurbishment: Provides a replacement tube during transmission repairs or rebuilding.
• Maintaining correct component positioning: Fits within its designated location in the gearbox casing.
• Reducing the risk of obstruction: Replaces a damaged or blocked tube that may interfere with the intended oil passage.
• Supporting long-term gearbox operation: Helps maintain the specified internal transmission arrangement.
• Preserving factory specification: Provides the original Porsche component reference for applicable transmissions.

Symptoms Of Wear Or Failure:
The transmission casing pipe does not contain moving parts and is generally not a routine service item.

Damage is more likely to be identified during gearbox dismantling, internal inspection or transmission rebuilding.

Common signs of a defective transmission casing pipe include:

• Visible cracking: A fracture may compromise the tube's condition.
• Bent or distorted tube: Mechanical damage may affect the intended oil passage or installation position.
• Blocked internal passage: Debris or contamination may restrict the tube.
• Corrosion: Surface deterioration may weaken the component.
• Damaged pipe ends: Incorrect removal or installation may deform the openings.
• Loose fitment: A damaged mounting or connection arrangement may prevent the tube from being correctly secured.
• Incorrect positioning: Improper installation may prevent the tube from occupying its intended location.
• Impact damage: Contact with tools or gearbox components during dismantling may damage the pipe.
• Wear marks: Unintended contact with surrounding components may cause abrasion.
• Contaminated oil passage: Metal particles or other debris may become trapped inside the tube.
• Missing tube: A previously rebuilt gearbox may lack the specified component.
• Incorrect replacement part: A tube of the wrong dimensions may not fit or function as intended.
• Signs of inadequate lubrication: Abnormal internal wear may justify inspection of the gearbox's complete lubrication arrangement.
• Abnormal gearbox noise: Internal lubrication problems can contribute to noise, although this is not a specific symptom of pipe failure.
• Premature gearbox component wear: Restricted lubrication may contribute to deterioration if the affected components do not receive the intended oil supply.

Why Replacement Matters:
Replacing a damaged transmission casing pipe helps maintain the original construction and oil-routing arrangement of the gearbox.

A bent, fractured or obstructed tube may no longer provide its intended internal passage.

If the gearbox's lubrication arrangement is compromised, surrounding mechanical components may be exposed to additional friction or wear.

Because the transmission operates under continuous rotational and torsional loading, maintaining its intended lubrication system is important for long-term reliability.

Installing a Genuine Porsche replacement Transmission Casing Pipe helps to:

• Restore the original oil passage: Replace a damaged or obstructed component.
• Maintain factory gearbox construction: Preserve the specified internal transmission arrangement.
• Support reliable lubrication: Maintain the intended oil-routing configuration.
• Replace damaged components: Renew cracked, bent or corroded tubing.
• Prevent incorrect assembly: Fit the specified component during gearbox rebuilding.
• Support transmission refurbishment: Complete repairs involving the gearbox casing.
• Reduce the risk of further deterioration: Address a known defect before returning the gearbox to service.
• Maintain correct component positioning: Restore the intended fit within the transmission casing.
• Preserve classic Porsche originality: Use the corresponding factory replacement component.
• Support long-term gearbox reliability: Maintain the transmission's designed internal arrangement.
• Avoid unsuitable substitutes: Replace the component with the correct Porsche reference rather than unverified tubing.
• Support professional gearbox repairs: Provide the appropriate part for a transmission rebuild.

Replacement is recommended when the tube is bent, cracked, blocked, severely corroded, missing or damaged during dismantling.

If internal transmission wear has already occurred, replacing the pipe alone will not repair the affected gears, bearings or other components.

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Transmission cover, front.

Fits:
Porsche 911 G / Carrera / Turbo 1974-1986
with electronic tachometer and without oil pump

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Diagram ref no 22

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Transmission drain plug for gear housing.
Hexagon socket head bolt.

Fits:
Porsche 911 1978-1986
Porsche 928 1978-1986

Diagram ref no 11

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Transmission drain plug for gear housing.
Hexagon socket head bolt.

Fits:
Porsche 911 1978-1986
Porsche 928 1978-1986

Diagram ref no 11

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