What is the size of the bolt on the water pump just above the pulley? It looks like an allen wrench or torx bit.

 

all the bolts on the water pump are regular bolts and if your talking on the pulley it will either be regular bolts or pressed on

 

The bolt is on the water pump and just above the pulley. the pulley partially hides the head of the bolt making getting a socket on it difficult. It does have an area to insert an allen wrench but not sure what size. I have already changed out the water pump but was still wondering what the size was. It would have been easier not to have used a socket and I couldnt get a torque wrench on the bolt after reinstalling.

 

I used a torx head bit either a t-45 or t-50 with a 1/4" drive ratchet and a 5/16 socket to hold the torx bit

 

You would be better off with an open end wrench. 9/16 or 15mm.