10MM Bi-Hexagon?

[cpayne5]

Hi -

I'm doing the head gasket in my 4Runner. I've gotten to the point where I need to remove the head bolts. The manual says to use a 10mm "bi-hexagon" wrench to accomplish this.

I did some research and found that this is also referred to as a triple square, and that Napa sells these tools. So, I go to Napa, pick one up and bring it home. It's too small!

So, my question is, am I right in thinking that these head bolts are "triple square" and that Toyota just has a misprint in their repair manual, or does bi-hexagon refer to something else that I need to be looking for?

 

[bdcardinal]

http://matcotools.com/catalog/product/KL40313309/HEAD-BOLT-SOCKET/

http://matcotools.com/catalog/product/BXP142M/14MM-12PT-HEAD-BOLT-SKT-6/

http://matcotools.com/catalog/product/BXP102M/10MM-12PT-HEAD-BOLT-SKT-6/

one of those maybe?

 

[cpayne5]

Thanks for the reply.

The first link you list is similar to what I got...
https://napaonline.com/Catalog/CatalogItemDetail.aspx?R=SER2305_0006403932

It's 10mm like the manual says, but it's way too small. I am going to pick up a 12mm one tomorrow. I am just wondering if Toyota's use of "bi-hexagon" is something other than triple square?

 

[Astro14]

Hexagons have different included angles (120 degrees) than squares (which are 90 degrees), so while both are 12 point...they are definitely not the same...

You need a bi-hexagon 12 point...not triple square...if I remember 7th grade geometry correctly...

 

[bdcardinal]

I just went to their page and searched for "toyota head" and those were what came up. Kind of lame they couldn't use something more common even a torx or allen head type would at least be easier to find.

 

[cpayne5]

Originally Posted By: Astro14
Hexagons have different included angles (120 degrees) than squares (which are 90 degrees), so while both are 12 point...they are definitely not the same...

You need a bi-hexagon 12 point...not triple square...if I remember 7th grade geometry correctly...


You are correct.
Here are two tools that SnapOn sells...
http://buy1.snapon.com/catalog/item.asp?...re&tool=all
http://buy1.snapon.com/catalog/item.asp?...amp;dir=catalog

Here is a PDF about it from SnapOn...
http://image.snapon.com/international/pdf/sadm10e.pdf

Mystery solved.

Thanks, guys.

 

[Astro14]

That's good to know on two counts: 1. I remember it right...and 2. that it applies to fastener specification...

Good luck with the HG...they are a royal PITA on the 3.0 V-6 in my '90 4-Runner...

 

[cpayne5]

Originally Posted By: Astro14
That's good to know on two counts: 1. I remember it right...and 2. that it applies to fastener specification...

Good luck with the HG...they are a royal PITA on the 3.0 V-6 in my '90 4-Runner...


Thanks!

I'm so close. Just 16 head bolts stand in my way at this point. Now I have to wait to get this tool.

 

[ajchien]

Wow. Thanks for teaching me something tonight.

 

[cpayne5]

The UPS man came through today. Heads are off.

Here is the SnapOn tool.