3AC-00012-0 Tohatsu PISTON RING 2ND

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.
Interval for Engine Oil and Filter Change
The interval for changing the engine oil and filters depends on the power rating of the engine. Refer to this Operation and Maintenance Manual, "Engine Rating Definitions" to determine the rating of the engine.
Table 1
Engine Oil and Filter Change Intervals (Deep sump)
Engine Rating Service Hours
A Every 1000 SH
Auxiliary Engine
B Every 750 SH
C Every 500 SH Note: The following table is applicable to engines with shallow oil pans.
Table 2
Engine Oil and Filter Change Intervals (Shallow sump)
Engine Rating Service Hours
A Every 500 SH
Auxiliary Engine
B Every 375 SH
C Every 250 SH Drain the Engine Oil
Do not drain the oil when the engine is cold. As the oil cools, suspended waste particles settle on the bottom of the oil pan. The waste particles are not removed with the draining cold oil. Drain the crankcase with the engine stopped. Drain the crankcase with the oil warm. This draining method allows the waste particles that are suspended in the oil to be drained properly.Failure to follow this recommended procedure will cause the waste particles to be recirculated through the engine lubrication system with the new oil.After the engine has been run at the normal operating temperature, stop the engine. Use one of the following methods to drain the engine crankcase oil:
If the engine is equipped with a drain valve, turn the drain valve knob counterclockwise to drain the oil. After the oil has drained, turn the drain valve knob clockwise to close the drain valve.
If the engine is not equipped with a drain valve, remove the oil drain plug to allow the oil to drain. If the engine is equipped with a shallow sump, remove the bottom oil drain plugs from both ends of the oil pan.After the oil has drained, the oil drain plugs should be cleaned and installed.Replace the Oil Filter With the Engine Stopped (Standard Oil Filters)
Caterpillar oil filters are built to Caterpillar specifications. Use of an oil filter not recommended by Caterpillar could result in severe engine damage to the engine bearings, crankshaft, etc., as a result of the larger waste particles from unfiltered oil entering the engine lubricating system. Only use oil filters recommended by Caterpillar.
Remove the oil filter with a 1U-8760 Chain Wrench.
Cut the oil filter open with a 175-7546 Oil Filter Cutter Gp. Break apart the pleats and inspect the oil filter for metal debris. An excessive amount of metal debris in the oil filter may indicate early wear or a pending failure.Use a magnet to differentiate between the ferrous metals and the nonferrous metals that are found in the oil filter element. Ferrous metals may indicate wear on the steel and cast iron parts of the engine.Nonferrous metals may indicate wear on the aluminum parts, brass parts, or bronze parts of the engine. Parts that may be affected include the following items: main bearings, rod bearings, turbocharger bearings, and cylinder heads.Due to normal wear and friction, small amounts of debris may be found in the oil filter. Consult your Cat dealer to arrange for a further analysis if an excessive amount of debris is found in the oil filter.
Illustration 1 g00103713
Typical filter mounting base and filter gasket
Clean the sealing surface of the filter mounting base. Ensure that all the old oil filter gasket is removed.
Apply clean engine oil to the new oil filter gasket.
Do not fill the oil filters with oil before installing them. This oil would not be filtered and could be contaminated. Contaminated oil can cause accelerated wear to engine components or engine damage.
Install the oil filter. Tighten the oil filter until the oil filter gasket contacts the base. Tighten the oil filter by hand according to the instructions that are shown on the oil filter. Do not overtighten the oil filter.Replacing the Engine Oil Filters During Engine Operation (Duplex Oil Filters)
This filter contains hot, pressurized oil that can cause burns and fire hazards, which may result in bodily injury or death. Follow the instructions given in this Operation and Maintenance Manual and stop the engine if rapid air movement exists to blow the oil.
Illustration 2 g06201854If the engine is equipped with duplex oil filters, the engine oil filter elements can be changed while the engine is in operation.