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Might need to adjust tappets on gf's fiesta it's got 1.3 pushrod engine in.
When you look at the 8 rockers with the rocker cover off
Turn the engine over till no 1 rocker is fully compressed then check no 8 tappet clearance 1+8=9 hence rule of 9
Now turn engine over till no 2 fully compressed then check no 7 ok 2+7=9 and so on till you have done all 8 simples
Personally I would use the old rocking method and it's quicker
When you look at the 8 rockers with the rocker cover off
Turn the engine over till no 1 rocker is fully compressed then check no 8 tappet clearance 1+8=9 hence rule of 9
Now turn engine over till no 2 fully compressed then check no 7 ok 2+7=9 and so on till you have done all 8 simples
Personally I would use the old rocking method and it's quicker