You will need a Haynes or some other comprehensive manual. You will have to be a pretty competent diy mechanic. You do realise that it will not be just timing belt replacement, the head will have to come off and the valves that have undoubtedly been bent will have to be replaced. A special screw in pin for TDC is required for K4M engine. Cam holding bracket is also req. (can be diy made with some angled steel and bolts if you have a drill and grinder).
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James McParland
December 2008