Belt Pulley With A/C Clutch (N25) Overview
Belt Pulley with A/C Clutch (N25) Overview
• If overload protection of pulley triggers, check the A/C compressor for ease of motion before replacing the pulley. If the A/C compressor creates friction, replace it completely.
• Depending on the engine type, it may be necessary to loosen the lock carrier from the vehicle and to pull it slightly forward (to make space).
• Different versions of the belt pulley (with different diameters) may be installed, depending on A/C compressor construction type and engine version. Refer to Electronic Parts Catalog (ETKA).
• The replacement belt pulley with A/C clutch has a single part number. The belt pulley and the drive plate are held together with one bolt (when the bolt is no longer needed, dispose of it). When the bolt was manufactured, a predetermined amount of a specific grease was applied to the threads in the drive plate; this amount is sufficient for bolting the drive plate to the compressor one time (a drive plate, which has been removed, cannot be reused). Refer to Electronic Parts Catalog (ETKA).
1 Sealing Cap
• Not always present
2 Clutch Plate
• Tightening specification 30 Nm
• Replace
• Attached to the A/C compressor input shaft
- Clean the contact surfaces on the clutch plate and belt pulley before installing.
- Clean the thread on the A/C compressor shaft before installing the clutch plate.
- Check the gap dimension between the belt and clutch plates and correct it if necessary before tightening. Refer to => [ A/C Compressor Clutch Plate ] A/C Compressor Clutch Plate.
• The thread of the new clutch plate has already been greased with a specific amount of a grease by the manufacturer.
• Different versions. Refer to Electronic Parts Catalog (ETKA).
• The overload protection takes over when the torque is excessive (for example, if the A/C compressor runs with resistance) and the belt pulley runs freely without driving the A/C compressor (N25).
Removing and installing
- Hold the compressor shaft - C - tight and turn the clutch plate counter-clockwise in direction of arrow with a suitable tool to remove as described for the drive plate on an A/C compressor without an A/C clutch. Refer to => [ A/C Compressor Clutch Plate ] A/C Compressor Clutch Plate.
3 Washer
4 Spacer
• For adjusting the gap dimension between the clutch and belt pulley.
• Checking clearance, refer to => [ A/C Compressor Belt Pulley and Clutch Plate Gap, Checking ] Testing and Inspection.
5 Circlip
• Replace
• Install on correct side (the flat side faces the A/C compressor)
• Be careful not to bend the locking ring more than necessary when installing it.
- Insert circlip on correct side, the side with beveled insertion edge - C - faces away from A/C compressor (install the flat side facing the A/C compressor).
6 Belt Pulley
• The belt pulley is sensitive to impact. Be very careful when handling it.
• Clean the flange on the A/C compressor flange before installing the belt pulley.
• There are different versions (depending, for example, on the type of engine). Refer to the Parts Catalog.
• If it is not possible to remove the belt pulley from the flange on the A/C compressor by hand, then refer to => [ Belt Pulley with A/C Clutch ] Belt Pulley With A/C Clutch.
7 Circlip
• Replace
• Install on correct side (the flat side faces the A/C compressor)
• Be careful not to bend the locking ring more than necessary when installing it.
- Insert circlip on correct side, the side with beveled insertion edge - C - faces away from A/C compressor (install the flat side facing the A/C compressor).
8 Magnetic Coil
• Make sure the bracket for the cable - B - is installed correctly.
• The connector - D - may be attached to the A/C compressor with a bracket, depending on the version.
9 A/C Compressor
• There are different versions depending on engine installed and the market. Refer to the Parts Catalog.
• Clean the A/C compressor flange before installing the pulley.
• Clean the compressor shaft thread and then coat the thread lightly with grease.