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Top End

Camshaft Replacement

Intake valves are key engine components that let the air/fuel mixture into the engine’s combustion chamber, while exhaust valves enable exhaust gases to leave the cylinder and pass into the exhaust system.

 

The camshaft uses lobes (called cams) that push against these valves to open them as the camshaft rotates; springs on the valves return them to their closed position. This is a critical job, and can have a great impact on an engine's performance at different speeds. Ensuring the correct maintenance of valves, cams and camshafts is therefore vital to ensure a smooth running and efficient engine.

When do we have to change the camshaft?

It is necessary to replace the camshaft when any of the following symptoms become apparent:

  1. Cams or supports show signs of marks or wear

 

  1. Camshaft has bent more than 0.05mm

 

  1. Axial displacement bigger than 0.15mm

 

  1. When changing the cylinder head

 

Recommendations when replacing the camshaft

When replacing the camshaft, BGA gives the following recommendations:

1. When cleaning the cylinder head / block surfaces do not obstruct the oil holes

2. When fitting the camshaft and timing belt / chain follow the instructions given by the engine maker.

3. Follow the torques specified to the camshaft bearing cap and camshaft drive pulley.

4. Adjust the tension of the timing belt / chain to the value specified by the engine maker.

5. Do not use reconditioned camshafts.

6. Fit the camshaft bearing caps in the same position.

7. Check the correct camshaft rotation.

8. Grease the cams.

 

Following the above replacement advice and recommendations when changing the camshaft will help to ensure a trouble-free replacement and ensure optimum performance of the engine that you are working on.

For further help and advice on camshaft replacement contact BGA on:

Telephone: 01793 491777

E-mail: technical@bgautomotive.co.uk

 

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