GUARD AS 1110423 - Caterpillar

Illustration 1.Use the following procedure to make sure the oil passages in the crankshaft and cylinder block are free of debris:
1. Remove all plugs. Allen head plugs may have to be drilled and removed with a 6.35 mm (.25") Easy Out Remover. Most lightening hole core plugs are held in position with snap rings. These snap rings can be removed with two screwdrivers or can be cut in half with a cold chisel. Cylinder block plugs and similar plugs in older crankshafts can also be removed with a cold chisel.2. Install one of the brushes from the chart in a variable speed drill. Use a brush that has a diameter that is just larger than the diameter of the oil passage to be cleaned.
Do not operate the drill unless the end of the brush is in the oil passage. This is especially important to prevent damage to the crankshaft journal by the metal end of the brush. Operate the drill at approximately 300 rpm.
3. Use a petroleum solvent and one of the brushes from the chart to loosen any debris or carbon (deposits) in all the oil passages in the crankshaft and cylinder block. See Illustration 2. Make sure the end of the brush goes to the end of each oil passage. Each oil passage must be cleaned from every possible direction. When the main oil passage in the cylinder block is cleaned, it will be necessary to weld a 3.18 mm (.125") mild steel rod to the end of the brush handle. Make sure the rod is long enough to let the brush go all the way through the cylinder block. See Illustration 3.
Illustration 2.
Illustration 3.4. Use the brush and a solution of detergent and water to "float" the debris out of the oil passages. Use water to wash the rest of the detergent and water solution out of the oil passages and then use an air hose to dry the cylinder block or crankshaft.
Clean oil must be put on the crankshaft as soon as it is dry to prevent rust damage.
5. If the crankshaft and cylinder block are not going to be used immediately, put a rust inhibitor on the crankshaft and cylinder block to prevent damage.6. Make sure the rust inhibitor is removed before the crankshaft is installed in the cylinder block.7. Install all the plugs in the crankshaft and cylinder block. See the Specifications section of the Service Manual for the correct torques and procedures for the installation of the plugs in the crankshaft and cylinder block.