Guidelines for Proper Crankshaft Seal Handling

Engine: 3400 All, 3300 All, 3200 All, 3100 All, 3000 All, and D-series All All 3500 Engines All 3600 Engines All C280 Engines C-10 All C-9 and C9 All C11 All C12 and C-12 All C13 and C-13 All C15 and C-15 All C16 and C-16 All C175 Engines C18 and C-18 All C27 All C32 All C4.4 Engines C6.6 C7 All C7.1



Table 1
Revision Summary of Changes in SEBF9243
05 Added new serial number prefixes.
04 Updated Effectivity
Updated Introduction
Updated Safety Section
01 – 03 Updated Effectivity

© 2014 Caterpillar All Rights Reserved. This guideline is for the use of Cat dealers only. Unauthorized use of this document or the proprietary processes therein without permission may be violation of intellectual property law. Information contained in this document is considered Caterpillar: Confidential Yellow.

This Reuse and Salvage Guideline contains the necessary information in order to allow a dealer to establish a parts reusability program. Reuse and salvage information enables Caterpillar dealers and customers to benefit from cost reductions. Every effort has been made in order to provide the most current information that is known to Caterpillar. Continuing improvement and advancement of product design might have caused changes to your product which are not included in this publication. This Reuse and Salvage Guideline must be used with the latest technical information that is available from Caterpillar.

For questions or additional information concerning this guideline, submit a form for feedback in the Service Information System. In order to address an urgent issue, use the following resources in order to communicate your request to Caterpillar Repair Process Engineering:

  • Caterpillar Dealer Technical Communicator
  • Dealer Solution Network
  • Caterpillar Technical Representative
  • Knowledge Network

Canceled Part Numbers and Replaced Part Numbers

This document may include canceled part numbers and replaced part numbers. Use NPR on SIS for information about canceled part numbers and replaced part numbers. NPR will provide the current part numbers for replaced parts.

Important Safety Information

Work safely. Most accidents that involve product operation, maintenance, and repair are caused by failure to observe basic safety rules or precautions. An accident can often be avoided by recognizing potentially hazardous situations before an accident occurs. A person must be alert to potential hazards. This person should also have the necessary training, skills, and tools in order to perform these functions properly. Safety precautions and warnings are provided in this instruction and on the product. If these hazard warnings are not heeded, bodily injury or death could occur to you or to other persons. Caterpillar cannot anticipate every possible circumstance that might involve a potential hazard. Therefore, the warnings in this publication and the warnings that are on the product are not all inclusive. If a tool, a procedure, a work method or operating technique that is not specifically recommended by Caterpillar is used, you must ensure that it is safe for you and for other people to use. You should ensure that the product will not be damaged or the product will not be made unsafe by the operation, lubrication, maintenance or the repair procedures that are used.


This guideline provides proper handling procedures for new crankshaft seals. Proper use of this guideline will prevent leaks and failures due to contamination and improper handling.

Best Practices


To reduce the risk of leaks and failures, it is important that crankshaft seals are properly installed. Proper operation of a crankshaft seal is dependent on many factors such as:

  • Cleanliness of the seal, tooling, and all other mating components.
  • Appropriate protection and handling of the crankshaft seal.

Mating Component Storage

Crankshafts and housings should be stored in a manner that will reduce contamination and damage to the sealing surfaces. Storage should also conform to the Cat dealer Contamination Control Compliance Guide (PEBJ0002).

Mating Component and Tooling Cleanliness

The housings, crankshafts, and all installation-related items must be free of all contamination. The housing bores and crankshafts must be free of scratches, nicks, dents, or any other feature that will compromise sealing.

Each housing bore and shaft should be wiped clean with a lint-free wipe before installation.

Inventory of subassembled crankshaft seals should be minimized to reduce risk of contamination and damage.

Handling of Crankshaft Seals

Some crankshaft seals arrive with a supplier-applied sealant around the outer diameter of the seal case and/or the inner diameter of the wear sleeve. This coating will typically be red, blue, or green depending on the supplier and seal location. This coating is critical for sealing against the bore and shaft, and must not be scratched or removed from the seal.

Illustration 3 g02860196
Proper crankshaft seal handling.

To avoid contamination, seals should be handled only by touching uncoated metal surfaces whenever possible. To reduce the risk of damage, never touch the seal on the sealing surface. If necessary, seals may be carefully handled on coated metal surfaces. Ensure that the coating does not get scratched nor contaminated.

Illustration 4 g02860461
(1) Wear sleeve

(2) Sealing lip

Some seals are supplied with a plastic sleeve around the interior diameter. The sleeve holds the PTFE (Polytetrafluoroethylene) sealing lips in place and the sleeve protects the seals from damage. Once this plastic sleeve has been removed, the PTFE sealing lips will begin to relax. If the PTFE sealing lips relax, the seals will prevent proper installation. These plastic sleeves must only be removed during or immediately before installation.

Assembly Tooling

Always refer to the appropriate Disassembly and Assembly Manual and/or Special Instruction for the tooling needed to install crankshaft seals for an engine model.

Tooling Inspection

Assembly areas should have procedures for inspection and cleaning of seal installation tooling. Areas of special importance include:

  • Any damage to the installation tooling that could damage the crankshaft seal diameter face.
  • Any malfunction of the hydraulic or pneumatic press supply pressure or pressure regulator.
  • The piloting features of the tool must be square and free from damage. Inspect the ram inside the press for damage or excessive wear.

If any of the above occurs, the seal may be damaged or will not be seated correctly. If damage is observed or noted, then immediately stop using the tool. Notify the appropriate dealer personnel to report the damage.

Tooling Maintenance and Damage Reporting

Routine Maintenance – All seal-specific tooling should be placed on a routine maintenance schedule similar to the torque-tooling schedule.

Reporting Damage – A formal reporting process shall be established at every dealer to report damaged tooling.

Replacement Tooling – Replacement tooling should be in inventory and available for immediate use to reduce the risk of downtime.

Tooling Storage

Tooling storage surfaces will be clean and free from contamination.

Ensure that tooling storage conforms to the Cat dealer Contamination Control compliance Guide (PEBJ0002).

Preassembly Inspection of Critical Components

Complete a brief inspection for seal and mating components for damage and contamination. This inspection is to provide a brief visual review of the part and mating component for damage or debris. This inspection is to help identify part issues before assembling the parts to the components.

Seal Inspection

Complete a visual inspection to verify the presence of the spring in crankshaft lip seals.

Note: Not all crankshaft lip seals will contain springs.

Crankshaft Inspection

Before installation of the crankshaft seal and the wear sleeve, inspect the crankshaft for scratches. Also, inspect the crankshaft for any distortion on the surface that may lead to an out of round condition. Use a polishing cloth to remove any slight imperfections on the crankshaft.


Seal Lubrication

Do not lubricate crankshaft seals. Crankshaft seals are intended for dry installation. Neither the sealing lip or the journal should be lubricated.

Apply Loctite sealant to the seal outside diameter and/or the wear sleeve inside diameter if either surface does not have supplier applied coating.

Refer to “Loctite Maintenance and Solutions Heavy Equipment Guide for Cat Dealers” for a list of sealant part numbers and the application for use. This document can be downloaded at:

Also refer to “Doing it Right Loctite User’s Guide” for the best application of Adhesives and Sealants. This document can be downloaded at:

Assembly Tooling Use

Use the correct seal assembly tool as specified in the proper Disassembly and Assembly Manual. Follow the tooling inspection and care processes during assembly.

All crankshaft seals require either a wear sleeve or installation sleeve for assembly regardless of the shaft. The sleeve prevents the seal lip from relaxing and being folded under during assembly.

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