Tool to fit the bolts on the big end bearings

Technical Area Engine, Transmission, Exhaust etc
1

I am looking for the tool to undo the bolts to access the the big end bearings, does anyone know where I can get one? My MX5 MK3 2009.

2

From memory are they not a 12 sided 12 or 14mm socket?

3

Thanks for reply but I am now thinking this is a Torx bolt, will have to buy appropriate socket.

IMG_5437
IMG_54373024×4032 2.86 MB

4

Yes, external Torx.

5

Yes E12, have now now removed. Found big end No. 4 bearing is the problem looks like it has spun in seating and one on top of the other slightly. May have done damage to crankshaft will know better when I clock it.

6

I was reading a strip down of an engine and twelve point was mentioned I’m sure. Is it possible they changed the fastener overtime? Just a thought.