New 1000 Serie » How to maintain the engine open and closed breather system

Caution: The material used for the cover, fitted to the engine breathers has been changed to a harder plastic.

As a result, the maintenance procedure and the maintenance period have changed. Also the part number has changed from 4133J005 to 4133J008. The part number is marked on the top of the cover of the latest oil separator. Do not try to remove the cover of the oil separator as it will break. The whole oil separator should be renewed at every engine overhaul or 8000 hours.

Some engines are fitted with an open breather which has a steel gauze (A2) to separate the oil from the crankcase gases before they leave the engine.

Note: It is not necessary to remove the body of the breather from the rocker cover to obtain access to the gauze.

1. Release the hose clip from the breather cover (A1).
2. Use a suitable lever between the outlet nozzle and the rocker cover to remove the breather cover from the body of the breather (A4). Ensure that the breather cover and the rocker cover are not damaged.
3. Use a cloth made damp with a proprietary cleaning fluid to clean the body of the breather.
4. Renew the "O" ring seal (A3).
5. Check that the inside of the breather pipe is clean. If the pipe is not clean, release the setscrews and remove the pipe. Wash the pipe with kerosene and dry it with low-pressure air.
6. Wash the steel gauze (A2) with kerosene and dry it with low-pressure air.
7. Fit the cover to the breather body, ensure that it is securely fitted.
8. Fit the breather pipe and tighten the hose clips.

How to maintain the engine closed circuit breather system

Caution: It is very important that closed circuit breather systems are fitted correctly to the engine. Incorrect installation can cause extreme damage to the engine.

Below is a series of safety precautions that must be applied at all times.

• Do not operate the engine if any of the breather valve or the induction hoses are loose or disconnected as this could allow dirt into the engine and damage to the engine could occur.
• Do not operate the engine if any of the breather valve or the induction hoses are bent such as to cause a restriction to the gases that flow through them. This can cause lubricating oil to enter the cylinders through the breather valve.
• Do not alter the design or any settings for the closed breather system.
• Ensure that the vent hole (A1) is not restricted during service.

The closed circuit breather used on the New 1000 Series engine comprises a body (A4) and a valve assembly (A5). The whole assembly must be renewed every complete overhaul of the engine or 8000 hours.

To renew the engine breather assembly

1. Release the three hose clips (A2) and remove the hoses.
2. Release the two setscrews (A3) and remove the breather assembly.
3. Clean the inside of the pipes with a proprietary cleaning fluid and dry them.
4. Fit a new breather assembly. Fit and tighten the two setscrews. Fit the three hoses in their correct positions on the breather and tighten the three hose clips.