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Discussion Starter #1 (Edited)
The subject of installation represents an area commonly overlooked when selecting an oil seal for an application. Studies have shown this area to be one of the major causes of premature seal failure.

To assist the installation, the seal should be prelubricated with grease or oil to reduce sliding friction of contact surfaces. This will also help protect the seal lips during initial run-in. An installation tool should always be used when installing an oil seal. The use of a tool improves ease of installation and reduces the possibility of seal cocking (non-perpendicular to shaft). A hydraulic or pneumatic press is advised to supply necessary force to install the seal.

Following are examples of both recommended and improper installation methods.

Proper Installation



 

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Discussion Starter #2 (Edited)
IMPROPER PROCEDURE







In each preferred method, installation load is absorbed by either housing or bottom plate to prevent seal damage and to assist in locating the seal properly within the bore.
 

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Discussion Starter #3 (Edited)
SHAFT INSTALLATION



The advisable sequence of installation is to install the seal over the shaft and then into the housing bore. Care should be exercised not to damage or deform the seal lip. The proper chamfer angle will minimize this problem. When installing over a keyway or spine, a sleeve or bullet should be employed to protect the seal lip from cuts.

Where the shaft must be installed through the seal, centering guides for the shaft will prevent lip deformation and dislodging of the spring. When possible, the shaft should be rotated as it passes through the seal to reduce sliding friction.







 

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Discussion Starter #4
Though most DIY'ers will not have access to an installation tool, you can use a larger socket, block of wood, or almost anything with an even flat surface to assist in installation. DO NOT use a screwdriver. You will damage the seal.

Please ensure you tap the seal gently and evenly.
 

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Discussion Starter #5 (Edited)
Bearing installation practices

Associated hardware, such as shafts and housings, must be designed with proper consideration for bearing mounting surface geometry and fits.

Associated hardware and assembly tooling must be clean, free of burrs, and demagnetized before contacting bearings.

Tooling should be designed to mount the bearings squarely onto the shaft and into the housing. Misalignment during installation can severely distort a bearing.

Apply force only to the ring being press-fitted. Shock or impact techniques should never be used to seat a bearing.

Tooling must be designed and used in a manner that will satisfy the basic assembly Do's and Don't's illustrated below.


 

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Discussion Starter #6
O-ring Installation hints & tips

Seal Surface Inspection


Prior to installing O-ring seal inspect all seal surfaces for cleanliness, proper finish and absence of defects. Surfaces and edges must be free of all contaminants, dirt, nicks, scratches, gouges, marks and burrs. Minor burs can be removed by ?touching? them with 400 grit emery paper, provided that the surface coating is not compromised.

Do not install O-rings on components that are not free of burrs or other imperfections.

Clean sealing surfaces and all surfaces that the O-ring may come in contact with during installation.

Prepare Seal Surfaces

Mask any sharp edges over which the O-ring must pass during installation (threads, holes,..etc). Do not mask the seal groove edge. Apply seal lubricant as a uniform thin film over entire seal groove and mating seal surface. For long life applications or for added anti-corrosion protection put sufficient lubricant in the groove that the groove will be full after the O-ring is installed.

Seal Inspection

No defects are allowable.

Again, any O-ring seals discarded for any reason should be cut completely through with a pair of scissors to prevent accidental re-use.


Seal Preparation

Apply a thin continuous film of seal lubricant over the entire O-ring seal surface. While applying the lubricant, pass the entire seal through your fingers several times to insure complete coverage and simultaneously inspect for defects and debris which might have become trapped in the lubricant. Lubricate the seal with the product you are sealing. DO NOT use brake fluid or brake cleaner under any circumstances.

Installation

Do not use metal tools to install or remove O-rings from their grooves. Install the O-ring seal in it?s groove without excessive twisting or stretching. Preferably O-rings should not be stretched more than 50% of their initial ID. Push the seal down to the bottom of it?s groove and all the way to the back, if it is a piston seal. Back is defined as the side that the O-ring will be pushed against during assembly. Inspect that the seal is evenly distributed and the same height around the groove. Remove excess lubricant or add lubricant, if desired, to fill the groove.

After the above installation steps are completed and prior to the next assembly it is recommended that an independent inspection operation be performed. The goal of this inspection is to provide a redundant check that all O-rings are installed and fitted up in their grooves correctly prior to closing the seal.
 
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