I am trying to check oil clearances on the main bearings. What kind of wrench do you use for this square headed bolt? Mine measures 9/16 inch across the flats. Thanks for the help!
Eight point socket 9/16 as I recall about 4.00 at NAPA
A 12-point socket (not a hexagonal one) works well if you have the right size. Try 11/16AF or 17mm
Michael ; I use this home made socket.
Use a square head socket. They exist. I have a set, quite old, that would qualify as a family heirloom.
As Gary said they're out there I saw one or two at Bakersfield last year. I inherited a square Plomb socket from my dad... well used but still functions.
9/16 square or 8 point socket type works.
Thanks for all the replies! I took one of the bolts and went to NAPA, bought 3 different 12 point sockets that seemed to fit, came home and it works great.
Doubt that NAPA would carry square sockets as there's no call for them on auto's today but they are made and they are available.
Proto & Sears carry them.
Never needed any more than a open ended spanner on the main bolts to maintain alignment. The dot on top gives the position for the bolt to stay for the cotter pin, they shouldn't be tightened by the bolt head, only the nut.
I use an old square head bolt wrench
It took one day for a Portland shipment to the coast for there eight point Napa socket. I use one with my impact and one on my torque wrench. Doing Babbitt you might be removing and resetting main caps several times so I like it easy. Using a larger 12 point will generally round off the corners on a square cap bolt after some time! Been there done that.
Take notice of the little teat on the head of the bolt as this will allow you to align so that the cotter pin will be easily installed. KGB
I use a main bolt wrench:
Maybe this would help.