COUPLING 7Y1461 - Caterpillar

Personal injury can result from hot coolant, steam and alkali.At operating temperature, engine coolant is hot and under pressure. The heat exchanger and all lines to heaters or the engine contain hot coolant or steam. Any contact can cause severe burns.Remove the filler cap slowly to relieve pressure only when the engine is stopped and the filler cap for the heat exchanger is cool enough to touch with your bare hand.Cooling System Conditioner contains alkali. Avoid contact with skin and eyes.
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Cat Dealer Service Tool Catalog" or refer to Special Publication, PECJ0003, "Cat Shop Supplies and Tools Catalog" for tools and supplies suitable to collect and contain fluids on Cat products.Dispose of all fluids according to local regulations and mandates.
The interval for the maintenance of the plate type heat exchanger depends on the operating environment of the vessel and on the operating time. The sea water that is circulated through the heat exchanger and the amount of operating time of the vessel affects the following items:
Cleanliness of the heat exchanger plates
Effectiveness of the heat exchanger systemOperating in water that contains the following will adversely affect the heat exchanger system: silt, sediment, salt and algae. In addition, intermittent use of the vessel will adversely affect the heat exchanger system.The following items indicate that the heat exchanger may require cleaning:
Increased coolant temperature
Engine overheating
Excessive pressure drop between the water inlet and the water outletAn operator that is familiar with the normal operating temperature of the coolant can determine when the coolant temperature is out of the normal range. Inspection of the heat exchanger and maintenance of the heat exchanger are required if the engine is overheating. Your Caterpillar dealer has the equipment and the personnel in order to measure the pressure drop across the heat exchanger.Cleaning Procedure
Removal and Disassembly of the Heat Exchanger
Drain the heat exchanger. Refer to the Disassembly and Assembly Manual, "Heat Exchanger - Remove" for the removal procedure.Refer to the Disassembly and Assembly Manual, "Heat Exchanger - Disassemble" for the disassembly procedure. Keep the plates in order..Cleaning the Heat Exchanger
Refer to "Choosing the Correct Cleaning Fluid" for the correct cleaning fluid for your heat exchanger. Clean the plates with a cleaning solution and a soft brush. Pressurized water may also be used. Do not use steel wool or a wire brush, which may scratch the plate. Any iron scratches on the plates can lead to corrosion of the plates. Rinse the plates with water.Choosing the Correct Cleaning Fluid
Refer to 1 for the correct cleaning fluid for the heat exchanger.
Table 1
Problem Source Cleaners(1)(2)(3)(4)
Scaling Calcium carbonate
Calcium sulfate
Silicates Nitric acid
Sulfamic acid
Citric acid
Phosphoric acid
Complexing agents
Sodium polyphosphates
Sediment(5) Corrosion products
Metal oxides
Silt
Diatomic organisms
Gross fouling Seaweed
Chips of wood and