I just finished re-reinstalling new water pump and thermostat housing. somebody (me) forgot to torque and tighten the water pump pulley size. I know because when I started it I heard a rattling sound which turned out to be the shaking pulley. Turned off the car which ran for awhile because I was trying to burp the coolant. Anyways, there were 2 bolts in when I checked so I think I am lucky and missed out totally screwing up. Does anyone know the size of these bolts I know there are 1/2 inch on the head. I need at least 2 more but I can buy them in a sit if I need to. Other 2 are probably in orbit.

 

all four bolts are same, remove one and measure it, or take it to the hardware store with you.

 

Welcome to the forum.

Please include the year, engine size, drivetrain and other relevant info on your XJ to make it easier for use to help you in future requests. You can add them in your profile, your signature or even in the body of the 1st post when you start a new thread.

Meanwhile, feel free to bookmark this page:

https://www.moparpartsgiant.com/

It's the online parts catalog for Chrysler/Dodge/Jeep vehicles (there are others, but this is a good start) . Simply enter your model info, then browse/search through sections for part numbers. Often (but not always) hardware descriptions will include actual sizes.