Electronic Fluid Temperature Control (ESTAT) Salvage Guideline {0374, 0599, 0700, 0701, 0708, 135V} Caterpillar

Caterpillar Products

All C175 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 not 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 document covers the disassembly, inspection, and reassembly procedures for the Electronic Fluid Temperature Control (EFTC) common on C175 Gensets and Locomotive engines. The EFTC must be inspected at every engine overhaul. The EFTC is known informally as the Electronic Thermostat (ESTAT). The EFTC uses a 6 inch flange to control the temperature of the engine coolant pump outlet temperature. The EFTC is a three-way valve that controls coolant flow from the engine block to either the radiator or back to the jacket water pump.

Service Letters and Technical Information Bulletins

References

Tooling and Equipment

Replacement Parts

Consult the applicable Parts Identification manual for your engine.

Standardized Parts Marking Procedure

Reference: SEBF8187 Reuse and Salvage Guidelines, "Standardized Parts Marking Procedures".

The code is a Cat standard and is used to record the history of a component. The code will identify the number of rebuilds and hours at the time of each rebuild. This information is important and should be considered for any decision to reuse a component.

Ensure that the mark is not covered by a mating part. Use a metal marking pen to mark the code onto the component.

Illustration 3	g06124077
DO NOT use numbering stamp punches to mark internal components.

The procedure for marking components is a Cat standard. This code is helpful when the machine is sold into a different territory after the first rebuild. During an overhaul, the previous code of a part should never be removed.

Example 1

Illustration 4	g03856853
Typical Example

Illustration 4 shows code (1-15). The first number (1) indicates that the gear had been rebuilt once. The second number (15) indicates that there were 15,000 hours on the gear at the time of rebuild.

Example 2

Illustration 5	g03856857
Typical Example

Illustration 5 shows code (1-12) and code (2-10). Code (2-10) represents the information from the second rebuild. The first number (2) indicates that the gear had been rebuilt twice. The second number (10) indicates that 10,000 hours accumulated on the gear between the first and second rebuild.

Note: Add the first and second rebuild hours to obtain the total number of hours for the gear in Illustration 5. In this example, the gear has a total of 22,000 hours.

Measurement Requirements

Cleaning Recommendations

Show/hide table

Personal injury can result when using cleaner solvents. To help prevent personal injury, follow the instructions and warnings on the cleaner solvent container before using.

• Before you inspect a part, clean the part thoroughly to remove all debris, paint, and oil.

• Use a proper lifting device to prevent damage to the part. Also, use a proper lifting device to provide safety to the operator when you lift the part.

• During cleaning, do not damage machined surfaces.

• Use pressurized air to dry parts.

Components

The EFTC consists of four main components: the fluid valve, the temperature control module, the stepper motor, and the engine coolant pump outlet temperature sensor. These main components and some sub components must be inspected for reuse at overhaul.

Illustration 6	g06382310
(1) TUBE-HEAT SHRINK (39.9-MM DIA) (6-CM) (2) HARNESS AS-WIRING (3) TUBE-HEAT SHRINK (4-CM) (4) GASKET-HOUSING (5) HOUSING-MOTOR (6) MOTOR GP-ELECTRIC (7) COVER AS-MOTOR HOUSING (8) ADAPTER AS (9) SEAL-O-RING (10) PISTON AS (11) DOWEL-REACTION (12) HOUSING-VALVE (13) MODULE GP-CONTROL (14) SEAL-O-RING (15) MOUNT AS-MOTOR

Disassembly

1. Remove the Adapter Assembly (8) from the housing valve.

2. Remove the Motor Cover (7). Using a socket and driver, manually unscrew the Piston (10) from the threaded rod. The piston assembly must be replaced at overhaul. Set aside the Dowel (11).

3. The harness can be left intact by removing the Module (13), Motor (6), and Motor Cover (7) as one unit.

   If there are signs of harness deterioration or evidence of loose connections, then proceed to Step 3a. If the harness appears fine, then proceed to Step 4

   1. Using appropriate safety precautions, cut through and remove Heat Shrinks (1) and (2). Take care not to cut into the harness.

   2. Disconnect the harness from the module and motor. Inspect the connections on the harness, module, and motor cover for pin or socket fretting.

   3. If fretting is found, then replace the harness and the mating piece (either the motor or the module). If fretting or deterioration is not found, then the harness can be reused. If reusing the harness, then the heat shrink must be replaced with new and installed properly to prevent water from entering the connection.

4. Remove and set aside Motor Housing (5).

5. Remove the Mount Assembly (15). The mount assembly must be replaced at overhaul.
   Show/hide table

   Illustration 7	g03685630
   Piston sealing surface.

6. Inspect the interior of the Valve Housing (12) for excessive rust or corrosion. If the corrosion is excessive, cleaning can be performed with a wire wheel, ball hone, or media cabinet. Inspect the piston seating surface to ensure that an adequate seal can be made.

Reassembly

Reassemble the EFTC with new o-ring seals, gaskets, piston assembly, mount assembly and electrical connections (if needed). After reassembly is complete, mark the EFTC housing according to the instructions in Reuse And Salvage Guidelines, SEBF8187. For reinstalling the EFTC onto the engine refer to the Special Instruction, REHS7950, "Installing the 387-8211 Thermostatic Valve Gp and the 387-8214 Thermostatic Valve Gp onto C175 Engines" for installation instructions.