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I need to change the cam belt on my wife's sirion, getting the crank pulley off is my first problem. How does one lock the engine to undo the crank bolt and are there any other special precautions I need to take?

Andrew

PS

It's simple enough, access hole through inner wing to loosen crankshaft nut with 19mm impact socket. Remove auxiliary belts. Remove top bolts from cambelt cover, Bring engine to TDC on 1 cylinder using mark on crankshaft pulley and timing belt cover..

Prise top of cambelt cover back gently and observe dimple in tooth of cam sprocket is adjacent to timing mark at top of cam cover.head. If not you are at TDC of cylinder 4 so rotate crank 360.

Remove crankshaft pulley and 4 bolts on water pump pulley. Undo remaining timing belt cover bolts and remove it.

Get someone to hold the camshaft pulley centre bolt with a spanner.

Slacken cambelt tensioner and remove, remove old belt. Replace with new belt and tensioner making sure dot on pulley remains pointing to mark at top. There is a similar mark at about 4 o'clock on the crank pulley.

Reassemble in reverse order. Gently rotate engine 360 to make sure everything is correct