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Here are a few steps to follow while replacing the belt.

- Firstly make sure the engine is cool, thus avoiding you from getting burnt

- Disengage the battery and chock the wheels so that the car cannot roll.

- Remove all obstructions to the timing belt cover which include:

a) Remove the air intake assembly.

b) Loosen the pulley that powers the water pump.

c) Remove any other accessories that interfere with access to the timing belt.

- Remove the timing belt cover bolts and pull the cover off.

- Check the tensioner bearings. Replace them if they are loose or noisy. I usually order genuine parts from lexuspartsdirect.

- Check the camshaft and crankshaft seals. If they leak, it could cause premature failure of the new timing belt. Replace them if necessary.

- Make sure that all timing marks are properly aligned, then loosen the timing belt tensioner and remove the timing belt.

- Put the new belt in place. Adjust the tension, if necessary. Make sure that it sits well over the teeth of the timing sprockets.

- Apply a new gasket to the timing belt cover and replace it.

- Reinstall all of the accessory pumps that you took off earlier, including the water pump.

- Check that all timing marks are still properly aligned.

- Reinstall the air intake assembly.

- Reconnect the battery.

- Start the engine and listen carefully to how it runs. You shouldn't hear any loud knocks if the timing is still

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Q: Replace the timing belt on a Lexus 400 SC?
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