Austin Ten Drivers Club

If the crank isn't broken then there cannot be any change in how far the pistons move up and down. That is fixed by the throws on the crank. If the crankshaft was broken then, depending on where the break is, some pistons will move the correct amount but others may not move at all. All the pistons o...

The timing chain connects to the camshaft and operates the valves. If the timing chain has broken the crankshaft would still turn with the pistons going up and down as usual. Turn the engine over with the starting handle to try and feel what is happening. You say the pistons are only moving about an...