WR1-1078.1 15.9x38x73 mm - Water Pump Shaft Bearing

WR1-1078.1 15.9x38x73 mm - Water Pump Shaft Bearing and Fan Drive Bearing

WR1-1078.1 is a special shaft bearing assembly used in water pump applications and selected cooling fan drive systems. It is commonly identified by the nominal dimensions 15.9x38x73 mm. This bearing type integrates shaft support and rotational guidance into a compact assembly. The WR1-1078.1 designation also appears in technical and commercial listings associated with INA, a brand of the Schaeffler Group.

Technical Specifications - WR1-1078.1

Exact dimensions and construction must be verified against the technical drawing and identification of the supplied bearing.

What Does WR1-1078.1 Mean?

WR1-1078.1 is a designation identifying a special bearing assembly with an integrated shaft.

It is not a standard deep groove ball bearing designation such as those used in the 6000 or 6200 series.

In this type of construction, the shaft forms an integral part of the bearing assembly, with the bearing arrangement designed for the specific equipment.

Correct identification therefore requires more than checking the outside diameter.

Important dimensions include the bearing housing length, individual shaft diameters and the positions of the mounting surfaces.

WR1-1078.1 Dimensions - What Does 47/73 mm Mean?

Two dimensional formats may be encountered in technical catalogs and commercial listings:

• 15.9x38x73 mm - simplified commercial dimensions.

• 15.918/15.961x38.1x47/73 mm - more detailed catalog dimensions.

The values 47 mm and 73 mm describe different lengths within the assembly.

73 mm represents the overall length, while 47 mm refers to the bearing housing length in the referenced replacement catalogs.

The 73 mm dimension should not be interpreted as the width of a conventional bearing outer ring.

When selecting a replacement, the position and length of the projecting shaft sections must also be checked.

Construction and Operating Principle

WR1-1078.1 belongs to a category of special shaft bearing assemblies designed to support a rotating shaft.

Its integrated construction reduces the need for separate shaft and bearing components.

During operation, the assembly supports the rotating shaft and accommodates loads generated by the connected drive components.

These loads depend on the specific machine design and operating conditions.

The precise internal bearing arrangement, rolling element type, load ratings and permissible operating speeds must be confirmed for the particular product version.

Applications of WR1-1078.1

The WR1-1078.1 designation appears in technical catalogs and replacement parts listings associated with:

• Water pump shaft assemblies.

• Selected engine cooling fan drive mechanisms.

• Cooling fan viscous coupling drive arrangements.

• Repair of special integrated shaft bearing assemblies.

Replacement parts listings also associate WR1-1078.1 with cooling fan drive components used in the Land Rover 300Tdi engine.

This reference does not automatically establish compatibility with every vehicle or application using the 300Tdi engine.

Before ordering, compare the original part number, shaft construction and technical documentation for the specific assembly.

Alternative Designations and Reference Numbers

The following designation formats may appear in product listings:

• WR1-1078.1

• WR1 1078.1

• WR1-1078.1 INA

• WR1-1078.1 15.9x38x73

• WR1-1078.1 15.9x38x47/73

Replacement parts listings for Land Rover 300Tdi cooling fan assemblies may also reference:

• ERR7146

• 374056-B

• 1087568

These are catalog references encountered in the replacement parts market.

Their appearance alongside WR1-1078.1 does not establish universal interchangeability for every application.

How to Select the Correct WR1-1078.1 Bearing

Before ordering, verify:

1. Complete designation WR1-1078.1.

2. Required manufacturer or brand.

3. Bearing housing outside diameter.

4. Diameters of the individual shaft sections.

5. Bearing housing length.

6. Overall assembly length.

7. Positions of the mounting surfaces.

8. Design of the mating hub or flange.

9. Required load-carrying arrangement.

10. Equipment manufacturer's installation requirements.

For special shaft bearings, the simplified dimensions 15.9x38x73 mm may not be sufficient to establish interchangeability.

WR1-1078.1 vs Standard Rolling Bearings

Unlike conventional rolling bearings, WR1-1078.1 is identified as a special integrated shaft bearing assembly.

A standard rolling bearing should not be considered a direct replacement for WR1-1078.1 without a complete engineering assessment.

Installation and Operation

Installing an integrated shaft bearing assembly requires suitable tools and careful inspection of the mounting surfaces.

During installation:

• Inspect the bearing housing bore.

• Verify the required interference or clearance fit.

• Apply installation force to the appropriate component.

• Avoid transmitting mounting forces through the rolling elements.

• Do not strike the shaft directly.

• Maintain the required axial position.

• Check that the assembly rotates correctly after installation.

For automotive applications, follow the service procedure specified for the relevant engine and cooling fan drive assembly.

Incorrect installation can damage the bearing or affect the alignment of connected components.

Frequently Asked Questions

What is WR1-1078.1?

WR1-1078.1 is a special integrated shaft bearing assembly referenced in water pump bearing catalogs and selected cooling fan drive applications.

What are the dimensions of WR1-1078.1?

The simplified nominal dimensions are 15.9x38x73 mm. Replacement catalogs also list the more detailed dimensional reference 15.918/15.961x38.1x47/73 mm.

Is WR1-1078.1 an INA bearing?

The WR1-1078.1 designation appears in listings associated with INA. However, the designation alone does not confirm the manufacturer of every individual product offered on the market.

Is WR1-1078.1 suitable for the Land Rover 300Tdi?

The designation appears in replacement parts listings associated with 300Tdi cooling fan drive assemblies. Compatibility must be verified against the specific assembly and original part references.

What do the dimensions 47/73 mm mean?

In the referenced catalog descriptions, 47 mm indicates the bearing housing length, while 73 mm indicates the overall assembly length.

Can WR1-1078.1 be replaced with a standard ball bearing?

Not without a detailed engineering assessment. WR1-1078.1 is a special shaft bearing assembly rather than a conventional bearing identified only by bore, outside diameter and width.

Is 374056-B interchangeable with WR1-1078.1?

Both designations appear together in replacement parts catalogs. However, exact dimensions and construction must be verified before substitution.

Which details are most important when ordering?

The complete designation, overall length, bearing housing length, shaft diameters, housing diameter and compatibility with the specific equipment.

WR1-1078.1 - Quick Technical Answer

WR1-1078.1 is a special integrated shaft bearing assembly used in selected water pump and cooling fan drive applications. Its nominal dimensions are 15.9x38x73 mm, while replacement catalogs also reference 15.918/15.961x38.1x47/73 mm. Correct selection requires verification of the complete designation, shaft geometry, housing dimensions and compatibility with the intended equipment.

Special Bearings at simmering.pl

simmering.pl supplies standard and special bearings, including integrated shaft bearing assemblies used in industrial equipment and mechanical drive systems.

When requesting WR1-1078.1, specify the complete product designation and nominal dimensions of 15.9x38x73 mm.

Our warehouse is located in Lublin, Poland. We ship orders throughout Poland, the European Union and worldwide.