Inspection of Rear Engine Mounts on 3500 Family of Engines {1152, 1154} Caterpillar

Caterpillar Products

All 3500 Engines

All G3500 Engines

Introduction

© 2019 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 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 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 technical questions when using this document, work with your Dealer Technical Communicator (TC).

To report suspected errors, inaccuracies, or suggestions regarding the document, submit a form for feedback in the Service Information System (SIS Web) interface.

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

Illustration 1	g02139237

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 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 recommended by Caterpillar is used, ensure that it is safe for you and for other people to use. 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.

Safety precautions and warnings are provided in this manual and on the product. If these hazard warnings are not heeded, bodily injury or death could occur to you or to other persons.

The hazards are identified by the safety alert symbol which is followed by a signal word such as danger, warning, or caution. The "WARNING" safety alert symbol is shown below.

Illustration 2	g00008666

This safety alert symbol means:

Pay attention!

Become alert!

Your safety is involved.

The message that appears under the safety alert symbol explains the hazard.

Operations that may cause product damage are identified by "NOTICE" labels on the product and in this publication.

Caterpillar cannot anticipate every possible circumstance that might involve a potential hazard. The safety information in this document and the safety information on the machine are not all inclusive. Determine that the tools, procedures, work methods, and operating techniques are safe. Determine that the operation, lubrication, maintenance, and repair procedures will not damage the machine. Also, you must determine that the operation, lubrication, maintenance, and repair procedures will not make the machine unsafe.

The information, the specifications, and the illustrations that exist in this guideline are based on information which was available at the time of publication. The specifications, torques, pressures, measurements, adjustments, illustrations, and other items can change at any time. These changes can affect the service that is given to the product. Obtain the complete, most current information before you start any job. Caterpillar dealers can supply the most current information.

Summary

This guideline covers visual inspection of used rear engine mounts to determine reusability. A used engine mount must be inspected for rubber cracking and deterioration. Current "generalized" recommendations say that rear engine mounts should be replaced at the third major overhaul. Often rear engine mounts can be used again, even after the third overhaul. At each rebuild, several recommendations can be followed to determine the specifications for "Use again" or "Do not use again". If these specifications are met, the rear engine mounts can be used again.

Mounts that meet the specifications found in this guideline can be expected to give normal performance until the next overhaul, when used again in the same application. Never use a rear engine mount that this guideline indicates should not be used again. Before installing a used reconditioned part, correct any condition that may have caused the original damage.

Service Letters and Technical Information Bulletins

Replacement Parts

Consult the applicable Parts Identification manual for your engine.

Visual Inspection

Once the rear engine mount has been removed, visually inspect the mount. The following illustrations show examples of rear engine mounts that can and cannot be used again.

Inspect rubber in the mount assembly for deterioration. Also check bonding of rubber between inner bracket and outer shell. If rear engine mount is to be used again, the rubber must be pliable. If rubber is hard and dry with severe cracks, the mount should not be used again. The following photographs will help determine if a rear engine mount can be used again. If mounts are used again, switch the mounts from side to side.

Illustration 3	g06382215
Typical example of minor chunking of rubber (4) and slight oil damage (3) to rubber surface. Neither condition is detrimental to performance of mount. (1) Inner bracket (2) Outer shell

Use again

Illustration 4	g06382217
Typical example of rubber that has shifted to cover mounting bolt holes.

Use again

If rubber is pliable and after removing rubber, indicated by arrows, from bolt hole openings.

Illustration 5	g06382218
Rubber is dry, hard, and has pulled away from the inner bracket. Severe rubber chunking is also present.

Do not use again