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[Andy B]

I`ve heard some outrageous fun can be had unbolting the crank pulley bolt 
The torque setting is huge me thinks 

In the past, on my Senator, I've just used a well placed clout of a lump hammer ..... it's all in the wrist action  however Marks suggests that 'isn't wise' on an Omega 
Or ..... block up a suitable spanner against the floor or inner wing & kick the starter. The last time I tried that (on a FWD car) I managed to wrap the ABS sensor wire around the spanner 

[raywilb]

having done three in the past two years I stand by locking the crank. if the crank locking pin is inserted correctly so all is showing is the knurled end of pin you will not have even a thou play on the pulley. so no chance of damaging any thing. i admit it still needs brute strength but a good socket, breaker bar & i use a jack handle slipped over the bar. when i have done mine i have heard it crack then i have had to re-position the socket & bar then on the second attempt it made the cracking sound again . after that i can remove the bolt with a 1/2" ratchet. use a new bolt.

[Marks DTM Calib]

having done three in the past two years I stand by locking the crank. if the crank locking pin is inserted correctly so all is showing is the knurled end of pin you will not have even a thou play on the pulley. so no chance of damaging any thing. i admit it still needs brute strength but a good socket, breaker bar & i use a jack handle slipped over the bar. when i have done mine i have heard it crack then i have had to re-position the socket & bar then on the second attempt it made the cracking sound again . after that i can remove the bolt with a 1/2" ratchet. use a new bolt.

Very different on the V6, it tends to destroy the key on the sintered cambelt drive sprocket