G'day everyone and thanks again for all the help, I took all advise and tips onboard when I did this today, great news is the nut is off and the thread on the shaft is ok!
Now for the nitty gritty on what I went through to get that bugger off! lol
First I tried soaking in WD-40. I used a block of wood wedged against the blade carrier and the deck, worked really well blade carrier wasn't going to turn anywhere.
I then tried a spanner, nope the nut end is rusted and not really enough to grip to. I then tried a socket on it with a breaker bar and extension. Nope that damn bugger woundn't budge. Also the socket was slipping off the nut because the nut was buggered, can't get a good grip on it like a new one.
Then I resorted to vice grips, you know when you get to this point you are running out of options...lol Damn I had the vice grips on that nut and I was hitting the vice grips with a peice of wood and a brick. The vice grips were just turning and stripping the metal off the nut and it never budged. Now I had a nut that was nearly rounded and seized on.
At this point in time i'm thinking I will have to resort to what NormK said and end up cutting the bugger off with an angle grinder. But I thought I won't do that until I at least try a rattle gun, as I knew I had one somewhere in the shed.
I have an air type rattle gun that I bought from Super Cheap Auto about 10 years ago now. I quickly checked the box and it's says it's a twin hammer type and about 560nm of torque.
I used a tube socket from a cheap set that I have as I knew it may get damaged trying to remove this nut. I hammered the best fitting socket onto the nut with a brick to get the best grip possible, because the nut hasn't got much left on it.
Then I hoped for the best and started the rattle gun, you little ripper! As soon as I hit that smashed on socket with the rattle gun the nut started turning and was off in about 5 seconds!
The thread on the shaft is also fine. It's great as I can keep working on this mower now. Awesome!
Just another question about putting a new nut back on, I have heard that it's not a good idea to put these nuts back on with a rattle gun as it's got too much torque and it might get threaded?
Any tips on putting these nuts back on a powertorque engine?
I have noticed on these powertorque engines, there is large sort of disc that turns near the bottom of the engine next to the steel deck? Maybe something could be put near this at the bottom to stop it turning to put a new blade carrier nut on? I'm not sure. Then i'm thinking I won't be removing the steel boss that sits on the shaft behind the blade carrier, this should also be seized on...haha. Maybe I can get some vice grips onto this from behind the blade carrier to stop the crank from turning while doing up the nut. Either way it's probably not as hard as it was getting the old rusted bugger off! LOL!
Cheers and thanks again everyone for all the help it's great!
