HUB 5K8586 - Caterpillar

Start By:a. remove crankshaft On 3304 Engines, the piston cooling orifices are installed in the No. 2 and 4 main bearing bosses in the cylinder block. On 3306 Engines, the No. 2 and 6 main bearing bosses each have two orifices. The No. 3 and 5 main bearing bosses each have one orifice. A replacement is necessary only if they are damaged. Normally it will only be necessary to be sure the orifices are clean. 1. Use a soft punch to remove the orifices from the cylinder block. The following steps are for the installation of the piston cooling orifices.2. Use Tool (A) to install piston cooling orifice (1) (small end first). Install the orifices in main bearing bosses until they are against the counterbore.3. Make sure that the passage is open after the piston cooling orifice is installed.End By:a. install crankshaft