A/C Clutch -N25- (Sanden), Servicing

A/C Clutch -N25- (Sanden), Servicing







Special tools and equipment required
- Torque wrench (5 - 50 Nm)

NOTE:
- The compressor bracket and related components can be removed and installed without discharging the refrigerant circuit.
- Compressor can only be serviced or replaced after discharging refrigerant system. Use Kent Moore ACR4 or equivalent.
- Remove ribbed belt.
- On Diesel engines, remove charge air cooler.
- A/C clutch, removing and installing.

1. Nut
- Self-locking
- Always replace
- 40 Nm
- Loosening and tightening
2. Clutch plate
3. Shims
- To adjust gap between clutch plate and pulley
- Gap: 0.4...0.8 mm
- Gap, checking
4. Circlip
- Always replace
- Flat side faces compressor
- Ensure proper seating in groove
5. Clutch pulley
6. Circlip
- Always replace
- Flat side must face compressor
- Must be seated correctly in groove
7. Clutch coil

NOTE: A thermo-fuse integrated into the clutch coil protects the A/C clutch in the event of overheating (e.g.: due to a binding compressor) The clutch coil circuit is interrupted.

8. Retainer
- With screw
9. Retainer
10. Retainer
11. Bolt
12. Compressor
- Manufacturer: Sanden
13. Threaded bushing

A/C clutch -N25- (Sanden), removing and installing

Special tools, testers, measuring instruments and auxiliary items required







- 3212 Spanner wrench (or equivalent two-hole pin wrench)
- Two arm puller
- Three arm puller
- Depth gauge
- Torque wrench (5 - 50 Nm)

NOTE:
- It is not necessary to discharge the refrigerant circuit to remove and install the A/C clutch.
- Remove ribbed belt.
- On Diesel engines, remove charge air cooler.

Hex nut, removing and installing







- Tightening torque: 25 Nm (18 ft lb)
- Remove hex nut while counter holding with two-hole pin wrench 3212 (or equivalent with 4 mm pins).

Clutch plate, removing







- Carefully pry off clutch plate using two large screwdrivers -A-.

Use locally available two or three arm puller if plate is securely seated (difficult to remove).

Clutch pulley, removing







- Remove circlip.
- Attach commercially available 2 arm puller -A- on shoulder -B- and pull off pulley.

Clutch coil, installing







- Install coil on compressor.
- Locate locking pin on coil coil -A- into recess -C-.

Clutch plate gap, checking







- Gap: 0.4...0.6 mm (0.015...0.023 in)

Determining "Dimension 1"
- Using depth gauge -1-, measure gap between top of clutch plate -3- and pulley -2- at three equally spaced locations (measurement must not deviate). Note result.

Determining "Dimension 2"
- If compressor is installed in vehicle, disconnect electrical connector -4- from vehicle wiring harness.
- Using a jumper wire, energize the clutch coil by applying 12 V (B+) to connector -4-. If compressor is removed from vehicle, compressor must be grounded.
- With clutch energized, measure gap between belt pulley -2- and clutch plate -3- with depth gauge -1-. Note result.

The allowable gap (0.4...0.8 mm) is the difference between "Dimension 1" and "Dimension 2".

NOTE:
- Gap must be within tolerance around entire circumference.
- If the gap is outside the permitted tolerance range, remove clutch plate and adjust gap by adding or removing shims.