I recently purchased a 92 Ford Tempo. The owner is a mechanic and says the camshaft bearing are worn. He said when the car gets warm and the oil starts to get thin the engine will knock.

How do I fix this?
Is it inexpensive?

It is expensive. The engine must be removed to replace the bearings. Try a thicker weight of oil that won't thin out so much when the engine is hot. If you are now using SAE 5-30 or SAE 10-30 oil change over to SAE 10-40 or SAE 20-50.

It is expensive. The engine must be removed to replace the bearings. Try a thicker weight of oil that won't thin out so much when the engine is hot. If you are now using SAE 5-30 or SAE 10-30 oil change over to SAE 10-40 or SAE 20-50.

Is there a source where I can find step by step instrucions on how to replace it?

Go to http://www.ebay.com/ Buy a used Ford service manual for your vehicle.

Go to http://www.ebay.com/ Buy a used Ford service manual for your vehicle.

Thanks for your help.