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A detailed and illustrated guide to changing the cam belt and water pump on a 156, 147 and GT JTDm

This is a guide to replacing a cam belt (or timing belt) and water pump on a 156, 147 and GT. This 'How to' is based on the GT.

If your belt has broken please use the appropriate guide for that operation

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Undo 10mm bolts circled in red and pull off engine cover, it has a push fitting on the far right hand side.

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Under the cover you fill find quite a complicated engine, don't let this daunt you.

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Remove the engine ECU from the cam belt end of the engine, dont disconect it, and place it on the inner wing.

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Undo the bolt that secures the coolant bleed pipe.

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Remove the top engine mounting.

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Remove engine mounting support bracket.

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Remove upper cam belt cover and the lower cam belt cover fasteners that you can reach from above.

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Jack car up and make sure it is safe and secure, then remove road wheel.

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Remove inner wheel arch liner and under tray.

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Using a spanner on the bolt in the middle of the auxiliary belt tensioner move the tensioner anti clockwise then slip the belt of the pulley

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Remove the crank shaft pulley, note that is only goes on in one position.

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Remove the auxiliary belt idler.

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Move the crank shaft round until the cam belt timing marks line up

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This is the crankshaft timing mark.

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and this is the camshaft timing mark.

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Remove cam belt tensioner.

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Remove cam belt idler.

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Remove water pump and replace with a new one, the water pump seizing up is the most common cause of cam belt failures.

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Line the marks on the cam belt (or timing belt)up with the marks on the camshaft and crankshaft pulleys. Please note there are two belts that fit this engine, 198 teeth on early cars and 199 on later vehicles.

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Tension the belt correctly and reassemble using the reverse of the above procedure. When you have finished reassembly, remember to top up the engine coolant and bleed the radiator using the bleed screw in the top left hand corner.

Related Links: For parts for this job or other service parts follow this link

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