Unlike gasoline engines, diesel engines have little vacuum available to power brake booster systems. The diesel is thus equipped with a vacuum pump, which is driven by a single belt off of the alternator. This pump is located on the top right side of the engine on the 2.2L and on the bottom left side of the engine on the 2.3L diesel engine.
REMOVAL & INSTALLATION
See Figures 1 and 2
- Loosen the vacuum pump adjustment bolt and the pivot bolt. Slide the pump downward and remove the drive belt from the pulley.
If the vacuum pump drive belt is to be replaced, the alternator drive belt must be removed.
- Remove the hose clamp and disconnect the pump from the hose on the manifold vacuum outlet fitting.
- Remove the pivot and adjustment bolts and the bolts retaining the pump to the adjustment plate. Remove the vacuum pump and adjustment plate.
The vacuum pump is not to be disassembled. It is only serviced as a unit.To install:
- Install the bolts attaching the pump to the adjustment plate and tighten the bolts to 15-20 ft. lbs. Position the pump and plate on the vacuum pump bracket and loosely install the pivot and adjustment bolts.
- Connect the hose from the manifold vacuum outlet fitting to the pump and install the hose clamp.
- Install the drive belt on the pulley. Place a 3 / 8 in. drive breaker bar or ratchet into the slot on the vacuum pump adjustment plate. Lift up on the assembly until the specified belt tension is obtained. Tighten the pivot and adjustment bolts to 15-20 ft. lbs.
The alternator belt tension must be adjusted prior to adjusting the vacuum pump belt tension.
- Start the engine and verify proper operation of the brake system.
The BRAKE light will glow until vacuum builds up to the normal level.