Socket size for a 20mm nut (crank nut)?

[markmac]

Need the correct size socket for the crank nut which I believe is 20mm.  Research says 30mm or 1-3/16".  Don't want to buy the wrong size here.  Tx

[otisdog]

My stock 74 tii is a 30mm, and it needs to be a thin wall to fit inside of my pulley. But i realize you're dealing with a different beast.'

[Son of Marty]

30 mm it is.

[PaulTWinterton]

1/2" drive, 30mm.  Impact gun recommended to remove the nut.

[Guest_anonymous]

30mm

 https://youtube.com/shorts/Gsj2fS2rrtQ?feature=share

[markmac]

Thank, the guy at Tooland is starting to look at me funny - was in there twice yesterday.  I hate having to return stuff.  Not needing to remove it, just need to get a wrench on it to turn the motor over.  Motor hasn't been turned in a while, its all sealed up and in the car but should be turned.  Plugs are out so hopefully not to tough to turn.

[PaulTWinterton]

45 minutes ago, markmac said:

Plugs are out so hopefully not to tough to turn.

Should be easy.  Still purchase the 1/2" drive version.  1/2" drive tools are stronger than the 3/8" ones.

[jibarnes]

I have a socket marked BMW 3025, 1/2" drive deep 30mm thin wall, I believe besides crank it is also what you need for five speed output, and diff pinion nut.

[irdave]

If you're just turning it by hand, the chrome, short, 12 point socket works fine.  Doesn't need to be anything silly- unlike the one for the back of the tranny.

[markmac]

Arghhhh.  Like just about everything with this car, nothing is normal or easy.  Bought a 30mm socket, it might fit the nut but doesn't fit through the hole/bottom pulley.  The opening is 33mm.  Whatever tool my engine builder was using fit the nut and fit through the opening on the pulley.  I am afraid to go back to my tool guy.  Any ideas??

[Lorin]

I would turn the OD of the socket down on a lathe. 

[2002iii]

That tool in your pictures looks custom made, don't see any markings on it. I would ask the engine builder about it, he probably can get or make you one.

 

A hazet 30mm might work if it's long enough, the one I have works on the transmission output nut.

 

Another option if you just want to turn the engine over, is to make an adapter plate that mounts to the four pulley bolts.

[markmac]

For now it is probably easier to take the pulley apart and go from there.  I was hoping not to have to do that.  Once I have that done then maybe I get something made or take an existing tool and have it modified.  Once I get the damn thing running, easy enough to turn it over with the starter.  It's been sitting a while so time to turn it over.

[Son of Marty]

If you just want to turn the engine over why not just put it in gear and push it?

[irdave]

6 hours ago, markmac said:

Arghhhh.  Like just about everything with this car, nothing is normal or easy.  Bought a 30mm socket, it might fit the nut but doesn't fit through the hole/bottom pulley.  The opening is 33mm.  Whatever tool my engine builder was using fit the nut and fit through the opening on the pulley.  I am afraid to go back to my tool guy.  Any ideas??

 

Dude.  Want me to pick up a cheap socket, turn it down and drop it in the mail?  How deep does it need to be less than 33mm?