Transmission Casing Pipe / Tube. Porsche 911 › 91530113303

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)  

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.

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.

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.