Place the dowel pin at the back of the compressor clutch field coil into the hole up front of the compressor and secure the field coil in place so that its wire lead isn't squeezed. Secure the compressor clutch field coil with a new snap ring so that the bevel is outside the motor and the eyelets either point toward the right or left side, depending on the position of the dowel pin. Secure the field coil with a snap ring and make sure the ring is seated using pliers for model 9764 or related tools. During pacemaker installation, make certain the friction surfaces are fine and use a snap ring that works with the bevel side outwards. Put a Snap Ring Pliers 9764 or equivalent and insert the snap ring that holds the pulley and bearing assembly securely. Should you reuse the clutch plate and pulley and bearing assembly, fit the original shims on the compressor shaft and if installing new parts, begin with a 2.54 mm stack of shims. Place the clutch plate in the front of the A/C compressor and hold it in place with the compressor shaft bolt, tightened to 19 Nm. Once tightened, examine the air gap at several points and give the pulley a spin before making sure it is correct. For recessed clutch plates, get the air gap measurement with a 90° wire gauge; for others, a blade gauge and 0.35 - 0.60 mm air gap are what you need. Adjust shims so the correct air gap is reached. Run the compressor clutch field coil wire behind the connector bracket, secure the connector onto the bracket and join the engine wire harness. After that, attach the front skid plate, lower the car, fit the accessory drive belt and link the negative battery wire back into the system.