Piston Oil Cooler Jet Explanation

PISTON OIL COOLER JET DESCRIPTION
The Piston Oil Cooler Jet (Fig 1) #1 is used to aid in the cooling of the pistons and the cylinder walls. There are three Piston Oil Cooler Jets used. Each jet is supplied oil by the main oil gallery. The oil is sprayed upwards onto the bottom of the pistons and sides of the cylinder walls. A Piston Oil Cooler Jet is mounted to the engine block under each pair of opposing cylinders.Each jet has a check valve that closes below 241 kPa (35 psi) to maintain ample oil pressure at idle. All three oil jets are identical and seal to the engine block using an O-ring and fastener.

PISTON OIL COOLER JET REMOVAL
NOTE: Piston oil cooler jet for cylinders one/two shown in illustration. Piston oil cooler jets for cylinders three/four and five/six are similar.
1. Remove the crankshaft. Refer to CRANKSHAFT, REMOVAL.
2. Remove the bolt (Fig 2) #1 and the piston oil cooler jet(s) (Fig 2) #2 from the engine block.
3. Remove and discard the O-ring seal (Fig 3) #1 from the piston oil cooler jet(s).

PISTON OIL COOLER JET INSTALLATION
1. Lubricate a new O-ring seal (Fig 3) #1 with engine oil and install on the piston oil cooler jet(s).
NOTE: Piston oil cooler jet for cylinders one/two shown in illustration. Piston oil cooler jets for cylinders three/four and five/six are similar.
2. Install the piston oil cooler jet(s) (Fig 2) #2 into the engine block and tighten the retaining bolt (Fig 2) #1 to the proper specification. Refer to TORQUE SPECIFICATIONS
3. Install the crankshaft. Refer to CRANKSHAFT, INSTALLATION
4. If removed, install the oil filter and fill the engine crankcase with the proper oil to the correct level. Refer to STANDARD PROCEDURE
5. Fill the cooling system. Refer to STANDARD PROCEDURE
6. Connect the negative battery cable and tighten the nut to the proper specification. Refer to
SPECIFICATIONS
7. Run the engine until it reaches normal operating temperature. Check cooling system for correct fluid level. Refer to STANDARD PROCEDURE