Piston, Piston Pin, and Connecting Rod Assemble. Cadillac Concours 1997

For 1990-2009 cars

#### Tools Required

J 38637 Piston Pin Retaining Ring Installer

#### Piston Rings

1. Using a piston ring expander, install the oil control ring assembly using the following procedure:

1.1. | Install the expander ring (1).

1.2. | Install the two oil scraper rings (2). Expand the rings only enough to clear the piston diameter. Overexpanding the piston rings will distort or crack the rings.

2. Install the second (3) and top piston (4) rings using the piston ring expander. Make sure you do not overexpand the rings.
3. Once the rings are installed, set the ring gaps at least 30 degrees apart from each other.

#### Piston Installation

1. Properly orient the piston on the connecting rod as follows:

• | The locating mark (4) cast into the underside of the piston should point towards the front of the engine.

• | The locating notch (3) on the connecting rod cap should be pointing towards the rear of the engine on odd-numbered cylinders and towards the front of the engine on even-numbered cylinders.

2. Align the piston pin bore with the connecting rod pin bore.
3. Slide the piston pin into the piston and the connecting rod.
4. Install the piston pin retainers using the J 38637 .
5. Repeat these procedures for the remaining pistons.