Cylinder head bolts

Post by **Syncro G** » 20 Sep 2007, 12:38

Got some new bolts for my JX head, they are the tripple square type head.

I have a quality T55 (halfords pro, 1/2dr) bit that fits them well, question is will it be reliable as it only has splines for every other spline on the bolt head.

As the book says I have to torque them up to 55lb ft (in 3 stages), then do another 180Ã‚Â° cold, folowed by another 90Ã‚Â° after the engines been run up to temp, and then another 90Ã‚Â° after 1000 miles - That sounds pritty dam tight so I want to make sure my tool will be able to handle that torque reliably.

If the T55 is not accepterble where can I get something that is? Can't find a "tripple square" bit anywhere so maybe i'm looking for the wrong name?

Post by **coilspring** » 20 Sep 2007, 14:04

I may be mistaken, but by 'Triple Square' do you mean 'bi-hex' ?

If thats the case, don't worry, the standard Hex (6 sided) socket is a better bet anyway as this grips the wall of the bolt better than the Bi-hex type as is more suitable for higher torque applications. (less chance of rounding)

Can someone correct me if if I have the wrong end of the stick on this?

Post by **coilspring** » 20 Sep 2007, 14:50

ah, just re-read the post again and it would appear I have been a bit of a muppet. Ignore the above.

Post by **coilspring** » 20 Sep 2007, 14:56

Had a quick look on the interweb and I think 'Torx' sockets (female) or bits (male) are what you mean. Something like the link below?

http://cgi.ebay.co.uk/14PC-QUALITY-SET- ... dZViewItem

Hopr this post helps. Sorry about the first one again. D'OH

Post by **ELVIS** » 20 Sep 2007, 16:57

is 3 x 4 the same as 2 x 6 ?