Preliminary Requirements

Safety Requirements

WARNING

IT IS THE RESPONSIBILITY OF THE OPERATOR TO OBTAIN AND OBSERVE THE MANUFACTURER'S MATERIAL SAFETY DATA SHEETS FOR CONSUMABLE MATERIALS. THESE CONTAIN INFORMATION SUCH AS, HAZARDOUS INGREDIENTS, PHYSICAL/CHEMICAL CHARACTERISTICS, FIRE, EXPLOSION, REACTIVITY, HEALTH HAZARD DATA, PRECAUTIONS FOR SAFE HANDLNG, USE AND CONTROL MEASURES AND ALSO TO TAKE LOCAL REGULATIONS IN TO CONSIDERATION.

CAUTION

DO NOT USE THIS PROCEDURE TO CLEAN THE BALANCE BEARINGS. THIS PROCEDURE WILL DISSOLVE THE ALUMINUM RIVETS THAT ARE USED IN THE BALANCE BEARINGS. CLEAN THE BALANCE BEARINGS BY FLUSHING WITH CoMat 10-061 STODDARD SOLVENT BEFORE INSPECTION.

THE ALKALINE RUST REMOVER, WATER RINSE, DEWATERING OIL, AND PRESERVATION OIL TANKS MUST BE USED ONLY FOR BEARINGS.

DO NOT USE THE SPM TASK 70-11-01-300-503 VAPOR DEGREASING OR THE SPM TASK 70-11-03-300-503 AQUEOUS CLEANING ON ANY BEARING PARTS.

Procedure

1. SUBTASK 70-11-22-300-001 Demagnetize the Bearing

   1. NOTE

      Ball and roller bearings are at all times susceptible to magnetic adherence of small unwanted particles. Strength of the magnetic attraction can prevent removal of such particles during soaking and washing operations.

      Check the bearing for magnetism. Make sure the remaining magnetism in the part is within plus or minus 3 Gauss. Refer the SPM TASK 70-24-01-240-501, SUBTASK 70-24-01-240-009. If magnetism is greater than plus or minus 3 Gauss, demagnetize the bearing as follows:

      1. NOTE

         Demagnetize non-separable bearings as assemblies.

         When you put the bearings through the demagnetizer, slowly turn the inner and outer races in opposite directions.

      2. NOTE

         The components of the disassembled bearing must be kept together.

         Demagnetize, one at a time, the components of separable bearings.

   2. Remove the bearing from the demagnetizer.

   3. Stop the demagnetizer.

   4. Remaining magnetism must be within minus 3 Gauss to plus 3 Gauss (Refer to demagnetization procedure in the SPM TASK 70-24-01-240-501 SUBTASK 70-24-01-240-009).

2. SUBTASK 70-11-22-300-002 Clean the Bearings in Alkaline Rust Remover Solutions

   1. 
      CAUTION
      THE REMAINING STEPS IN THIS PROCEDURE MUST BE DONE WITHOUT ANY INTERRUPTION TO AVOID ANY CORROSION THAT COULD FORM ON THE SURFACES OF THE BEARING.
      DEMOUNTABLE BEARINGS MUST BE CLEANED IN DETAIL. DO NOT REMOVE ROLLING ELEMENTS FROM THE CAGE.
      THE DETAIL RING FROM SEMI-DEMOUNTABLE BEARINGS MUST BE CLEANED SEPARATELY. (A SEMI-DEMOUNTABLE BEARING HAS ONLY ONE RING THAT CAN BE REMOVED FROM THE BEARING ASSEMBLY).
      DO NOT PLACE THE BASKET ON THE BOTTOM OF THE TANK.
      DO NOT STACK BEARINGS ON TOP OF ONE ANOTHER.

      NOTE

      If ultrasonic agitation is used, do not exceed 170 deg F (77 deg C) because the higher temperature reduces the effect of the ultrasonic agitation.

      Put the bearing in one of these types of baskets:

      1. A stainless steel basket with liner sheets of polypropylene or polytetrafluoroethylene (PTFE) on the inner bottom and side surfaces of the basket.

         1. The liner sheets must be of sufficient size to make sure that engine parts in the basket do not touch metal surfaces of the basket.

         2. The liner sheets must have holes of sufficient number and size to let solutions flow freely through the bottom and sides of the basket, but engine parts in the basket must not touch metal surfaces of the basket through the holes.

      2. A coated basket. Use Halar (R) ECTFE fluoropolymer for the coating layer on the basket.

         1. As an alternative to the Halar (R) ECTFE fluoropolymer, it is permitted to use other coating materials that are chemically resistant to petroleum products and hot alkali solutions.

   2. Soak for five minutes in one of these alkaline rust remover solutions:

      1. Solution Code 20 at 180 to 195 deg F (82 to 91 deg C).

      2. Solution Code 78 at 180 to 195 deg F (82 to 91 deg C).

      3. Solution Code 79 at 165 to 175 deg F (74 to 79 deg C).

      4. Solution Code 112 at 180 to 195 deg F (82 to 91 deg C).

      5. Solution Code 120 at 165 to 180 deg F (74 to 82 deg C).

   3. 
      CAUTION
      DO NOT USE THE AIR AGITATION.

      Agitate the solution by one of the methods that follow:

      1. Mechanical method (preferred).

         1. Agitate the solution by up and down movement of the basket, or by a circulating solution pump, or by a mixer.

      2. 

         CAUTION

         IF ULTRASONIC AGITATION IS USED AS AN OPTION, THE MAXIMUM ULTRASONIC TIME MUST NOT BE MORE THAN FIVE MINUTES. IT HAS BEEN DETERMINED THAT CAVITATION AND/OR MECHANICAL DAMAGE WILL RESULT TO THE ROLLING ELEMENTS OF THE BEARING IF THE TOTAL TIME IS EXCEEDED. THIS CAN RESULT IN FAILURE OF THE BEARING.

         POWER MUST BE OFF DURING IMMERSION AND WITHDRAWAL OF THE BEARING.

         DO NOT USE ULTRASONIC AGITATION ON NON-DEMOUNTABLE BEARINGS OR SEMI-DEMOUNTABLE MAIN SHAFT BEARINGS; ULTRASONIC AGITATION CAN BE USED ON SEMI-DEMOUNTABLE ACCESSORY BEARINGS.

         

         CAUTION

         THE ULTRASONIC UNIT MUST HAVE A TIMER THAT AUTOMATICALLY SHUTS OFF THE MACHINE.

         NOTE

         Ultrasonic power intensity can be rated in several ways, as follows:

         1. Watts/Square Inch of Tank Cross-Section:

            To calculate the watts/square inch of tank cross-section area in square inches into the average power of the ultrasonic generator. The result is the average power intensity (in watts/square inch) in an ultrasonic cleaning tank in which all areas are to be used for cleaning.

            This is the important rating in standard bottom transducer ultrasonic tanks. It permits you to determine if there is sufficient power to do the cleaning that is necessary on the amount of parts that are to be cleaned at one time.

         2. Watts/Gallon or Liter of Solution:

            To calculate the watts/gallon or liter of solution, divide the average power of the ultrasonic generator by the solution volume of the cleaning tank. The watts/gallon or liter will give a comparative idea of how fast the tank will heat up and help in the selection of correct heating or cooling elements to keep the solution temperature at the most efficient level.

      3. Ultrasonic method (optional).

         1. A 20 KHz - 40 KHz frequency ultrasonic unit is recommended with an intensity of 6 watts/square in. to 11 watts/square in. (0.93 watts/square cm - 1.71 watts/square cm) of the tank cross section or 79 watts/gallon to 81 watts/gallon (20.86 watts/liter - 21.38 watts/liter). Do not exceed either one of the maximum limits.

         2. Do an inspection of all functional surfaces of semi-demountable accessory bearings for ultrasonic damage (scratches and scuffing). Refer to the SPM TASK 70-29-01-290-501.

   4. 
      CAUTION
      DO NOT USE A HIGH PRESSURE WATER SPRAY (POWER SPRAY WASHER). IT IS PERMITTED TO USE AN AIR-ASSISTED WATER SPRAY GUN.

      Flush the bearings in cold water.

      1. Cold water spray rinse (flush) the bearings fully in the basket over the top of the alkaline rust remover solution tank.

      2. A soft brush can be used to remove all unwanted material remaining on the bearing.

      3. It is not necessary to remove stains.

      4. NOTE

         The ultrasonic method must not be done one more time.

         If the bearing is still not clean do steps A. and B. one more time.

      5. Make up new alkaline rust remover solution if the cleaning is not within the parameters of step A. and a recycle step is regularly necessary.

3. SUBTASK 70-11-22-300-003 Immerse the Bearings

   1. 

      CAUTION

      THESE IMMERSION/RINSE STEPS MUST BE DONE IMMEDIATELY TO PREVENT THE BEARING FROM DRYING AND FLASH RUSTING.

      NOTE

      Mechanical agitation of the water is a preferred option.

      Put the bearing fully immediately into the cold rinse water tank for a maximum of one minute. Counter-rotate non-demountable and semi-demountable bearings to make sure the bearings are fully flushed.

   2. Remove the bearing from the water and put it immediately into CoMat 10-089 DEWATERING OIL or CoMat 10-090 DEWATERING OIL or CoMat 10-091 DEWATERING OIL or CoMat 10-143 DEWATERING OIL or CoMat 10-144 DEWATERING OIL at room temperature for five minutes.

   3. NOTE

      Periodically remove the water from the bottom of the tank of water-displacing oils that are at room temperature.

      Lightly agitate the bearing to make sure all the remaining water is removed. Counter-rotate non-demountable and semi-demountable bearings to make sure that they are fully flushed.

   4. Remove the bearing from the dewatering oil and let it drain.

   5. NOTE

      1. For bearings that go directly to inspection, oil must stay on the bearing. Just before inspection, excess oil that can interfere with inspection can be wiped off with a clean, lint-free cloth. After inspection, preserve and prepare the bearing for storage. Refer to the SPM TASK 70-53-01-620-501, SUBTASK 70-53-01-620-002.

      2. CoMat 10-125 LUBRICATING AND PRESERVATION OIL is a long-term preservation oil that is compatible with synthetic engine oil, so it is not necessary to remove it before the installation of bearings into the engine.

         CoMat 10-125 LUBRICATING AND PRESERVATION OIL is thin unlike some of the thick preservation oils of the past.

         The removal of oils other thanCoMat 10-125 LUBRICATING AND PRESERVATION OIL is necessary to prevent foam and black oil and this removal is a longer procedure.

      Put the bearing fully in clean CoMat 10-125 LUBRICATING AND PRESERVATION OIL.

   6. Prepare the bearing for inspection or storage. Refer to the SPM TASK 70-53-01-620-501, SUBTASK 70-53-01-620-002.