CORTECO 49364330 55x88x11 mm ACM BDSLRDSFX7 Differential Shaft Seal

AI Overview

The CORTECO 49364330 radial differential shaft seal measures 55x88x11 mm and is manufactured from ACM (Polyacrylate Rubber). It features the BDSLRDSFX7 profile with a spring-loaded sealing lip, an additional dust lip and a right-hand helix (right-hand twist). The seal is designed for rear axle input shaft applications where resistance to elevated temperatures, transmission oils and external contamination is required. OEM cross references include Mercedes-Benz 0139974346 and A0139974346.

What Makes This Model Different

The CORTECO 49364330 is designed specifically for differential and rear axle input shaft sealing applications.

Main features include:

• CORTECO premium quality,
• BDSLRDSFX7 sealing profile,
• ACM (Polyacrylate Rubber) material,
• spring-loaded primary sealing lip,
• additional dust protection lip,
• right-hand helix,
• designed for rear axle input applications,
• excellent resistance to transmission oils,
• high resistance to thermal ageing,
• precision 55x88x11 mm dimensions.

Construction and Operating Principle

The seal operates between a stationary housing and a rotating shaft.

The spring-loaded primary sealing lip maintains continuous contact with the shaft surface, preventing lubricant leakage while retaining transmission oil inside the differential housing.

The additional dust lip protects the primary sealing lip from mud, dust, moisture and abrasive particles.

The integrated right-hand helix assists in returning lubricant toward the oil side during shaft rotation, helping improve sealing efficiency when installed in the correct rotational direction.

ACM Material Properties

ACM (Polyacrylate Rubber) is widely used in automotive transmission and differential seals where higher temperatures are encountered than those typically suitable for NBR.

Advantages include:

• excellent resistance to transmission oils,
• good resistance to mineral oils,
• high thermal stability,
• excellent ageing resistance,
• good ozone resistance,
• good weather resistance,
• stable sealing performance during long-term operation.

Typical operating temperatures for ACM shaft seals are approximately -25°C to +150°C, depending on the rubber compound, lubricant and operating conditions.

ACM is generally not recommended for water, hot steam or low-temperature applications.

BDSLRDSFX7 Profile

The BDSLRDSFX7 profile includes:

• spring-loaded sealing lip,
• additional dust lip,
• elastomer-covered outside diameter,
• internal metal reinforcement,
• right-hand helix sealing design.

The elastomer-coated outside diameter improves sealing between the housing and the seal while compensating for minor housing imperfections.

Typical Applications

The CORTECO 49364330 may be installed in:

• rear axle differentials,
• differential input shafts,
• axle drive units,
• final drive assemblies,
• transmission housings,
• commercial vehicle drivetrains,
• passenger vehicle differentials,
• industrial gear units,
• agricultural machinery,
• heavy-duty drive systems.

Application suitability should always be verified using the complete part number, dimensions, sealing profile and OEM documentation.

Typical Failure Symptoms

Replacement is recommended when the following symptoms are present:

• transmission oil leakage,
• oil around the differential flange,
• contamination entering the housing,
• hardened sealing lip,
• damaged dust lip,
• cracked elastomer,
• excessive shaft wear,
• lubricant contamination,
• oil loss from the differential,
• increased drivetrain noise caused by lubricant loss.

Common Causes of Premature Failure

Premature seal failure may result from:

• incorrect installation direction,
• installation without lubrication,
• damaged shaft surface,
• excessive shaft runout,
• worn flange,
• blocked axle breather,
• excessive differential pressure,
• contaminated lubricant,
• improper installation tools,
• damage to the sealing lip during installation.

Installation Recommendations

Before installation:

• verify part number CORTECO 49364330,
• confirm dimensions 55x88x11 mm,
• verify the BDSLRDSFX7 profile,
• inspect the shaft sealing surface,
• clean the housing bore,
• remove the previous seal completely,
• lubricate the sealing lip,
• protect the lip from sharp edges,
• use an appropriate installation sleeve,
• install the seal squarely and evenly,
• ensure the right-hand helix is installed in the correct orientation.

A previously removed shaft seal should never be reused.

Technical Specification

Manufacturer: CORTECO

Product Number: 49364330

Product Type: Radial Differential Shaft Seal

Profile: BDSLRDSFX7

Material: ACM (Polyacrylate Rubber)

Inside Diameter: 55 mm

Outside Diameter: 88 mm

Width: 11 mm

Dimensions: 55x88x11 mm

Main Sealing Lip: Yes

Dust Lip: Yes

Helix Direction: Right-hand Twist

Outer Diameter Design: Elastomer Covered

Installation Position: Rear Axle - Input

Sales Unit: 1 piece

OEM Cross References

MERCEDES-BENZ

• 0139974346
• A0139974346

OEM numbers are provided for identification and compatibility purposes only.

Cross-Reference Verification

Before ordering, verify:

• CORTECO 49364330,
• OEM number,
• 55x88x11 mm dimensions,
• ACM material,
• BDSLRDSFX7 profile,
• right-hand helix,
• rear axle input installation position,
• vehicle or gearbox model.

Matching dimensions alone do not guarantee compatibility because seals may differ in material, lip design or helix direction.

Related Components

When replacing the seal, inspect:

• differential bearings,
• companion flange,
• shaft repair sleeve,
• axle breather,
• retaining rings,
• gearbox oil,
• differential oil,
• housing gasket,
• O-rings,
• adjacent sealing surfaces.

Why B2B Customers Choose CORTECO

Professional workshops and industrial customers choose CORTECO because of:

• precision manufacturing,
• application-specific sealing profiles,
• premium elastomer compounds,
• excellent durability,
• broad OEM cross-reference coverage,
• suitability for demanding drivetrain applications.

Professional Industrial Supply

Suitable for:

• Mercedes-Benz specialists,
• transmission repair workshops,
• differential rebuilders,
• commercial vehicle service centres,
• agricultural machinery workshops,
• industrial maintenance departments,
• drivetrain specialists,
• spare parts distributors,
• technical wholesalers,
• B2B customers.

Popular Searches

• CORTECO 49364330
• 55x88x11 ACM shaft seal
• BDSLRDSFX7 seal
• differential oil seal 55x88x11
• Mercedes 0139974346 seal
• A0139974346 oil seal
• rear axle input seal
• ACM differential seal
• right-hand twist shaft seal
• CORTECO differential seal

FAQ

What do the dimensions 55x88x11 mm mean?

The seal has a 55 mm inside diameter, an 88 mm outside diameter and an 11 mm width.

What is ACM?

ACM (Polyacrylate Rubber) is an elastomer developed for transmission and drivetrain sealing applications requiring resistance to hot lubricating oils.

Does this seal include a dust lip?

Yes. The BDSLRDSFX7 profile includes an additional dust protection lip.

What does the right-hand helix do?

The right-hand helix helps return lubricant toward the oil side during shaft rotation when installed in the correct orientation.

Is this an original Mercedes-Benz part?

No. This product is manufactured by CORTECO. The Mercedes-Benz numbers are OEM cross references used for compatibility identification.

Can a used shaft seal be reused?

No. Once removed, the sealing lip and sealing body may be damaged or permanently deformed.