Problems with crankshaft pulley and head gasket - weird sounds

[must0ne]

you need to use an impact wrench with the bolt on the crankshaft bolt. Make sure when you put it back on you use at least about 40 ft pounds

Thank you for advise. I've already tried with an impact wrench, but I'll guess that it's too weak to do the job. Buying a more powerful would cost quite much and I'm afraid of damaging the bolt.

I've found a tip from the internet (must be clever..) to put in a rope from a spark plug hole and then try.

Do you have any experience or opinion on this?

Thanks!