Tensioner Pulley Bolt

I bought an EFI 'serpentine' accessory setup but it didn't have the tensioner or tensioner bolt. I ordered both on rockauto but the bolt is the wrong size.

Does anyone here have one? What size is it? Is there anything special about it or will a regular grade 8 in the same size work as a replacement?

Thanks

SLord82 wrote:I bought an EFI 'serpentine' accessory setup but it didn't have the tensioner or tensioner bolt. I ordered both on rockauto but the bolt is the wrong size.

Does anyone here have one? What size is it? Is there anything special about it or will a regular grade 8 in the same size work as a replacement?

Thanks

The latest 460 truck F.I. engines don't have spring tensioners that I am aware of ... they do offer a static pulley to delete the air conditioner.
A Ford truck F.I. 460 engine uses two belts for accessory drive, not one serpentine belt.

The EFI 'serpentine' setups do have a spring tensioner in between the AC and the WP. I just need the bolt that holds it on.

I can't help with the bolt size but here is a picture of a 460 setup.

OK ... I have not seen that set-up ... the two ribbed belt set-up, (no air conditioning), on our 78 parts truck with a transplanted engine uses the power steering pump on a different bracket, where that pump distance is adjustable for that belt tension; like the alternator does on the other side.

From the looks of it that center bolt might be left handed thread.

Does anyone know what size bolt that is?

Are you asking about the bolt in my setup (the one pointed to in my attached picture)?
If that is what you need to know, I will go out and remove and measure the bolt for you.

EDIT: Well I can't attach a picture. Not sure why (says "max file size 0 KB").
Is it the bolt in the center of the (silver colored) tensioner your asking about? That bolt threads into the aluminum bracket that the tensioner mount to. I'll be happy to measure if for you - if you have the setup that I have.

Yeah that's what I was looking for but I ended taking the bracket off and going to the store. Found a 1/2"-13 grade 8 bolt at 3.5 inches long that worked.

Thanks though