Withdrawal
1. Remove the plugs, unscrew the fastening nuts and remove the top cover from the engine. The vacuum pump is installed in the rear left side of the cylinder block.
2. Loosen the clamp and disconnect the vacuum hose from the pump.
3. Turn away a bolt of fastening then accurately remove a forked clip of fastening of the vacuum pump to the block.
4. Remove the vacuum pump from the block of cylinders and remove a sealing ring. Discard the ring - a new one is required for installation.
Installation
5. Install a new seal on the pump, apply a light coat of engine oil to ease installation.
6. Install the pump in its place, making sure that the slot in the drive gear is aligned with the protrusion on the drive shaft (pic. 20.6).
7. Install the fork clamp and securely tighten the clamp bolt.
8. Attach a vacuum hose to the pump and secure it with a clamp.
9. Install the top cover on the engine and securely tighten the top cover nuts.
10. Make sure the mating surfaces are clean and dry and install a new head gasket.
11. Install the pump on the head, aligning the new drive key with the slot on the camshaft, wrap the pump mounting bolts and tighten them securely.
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