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Home > Help Needed / General Tech Chat > 7/16ths head gearbox bolts

Joe C

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Carlos Fandango

Burnham-on-Crouch, Essex

17th Apr, 2008 at 09:46:52pm

This has some useful stuff.

http://www.speedflow.co.uk/tech/index.html

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

https://joe1977.imgbb.com/



Nic

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First mini turbo to get in the 12's & site perv

Herefordshire

17th Apr, 2008 at 11:29:00pm

Cheers punk

Richie

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a LIL fishing village on the coast - Newcastle Upon Tyne

18th Apr, 2008 at 11:48:59am

Nic why not drill em all through and go with the nut and bolt approach, its a bit old school but the rallyx lads used to do this as it was considered stronger (even though the standard items were strong enough)



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MikeRace, Mini13

On 17th Aug, 2009 Jay#2 said:
I doubt I'll be dipping into the 13's like you did though!

Mirage

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Staffordshire or Northamptonshire

20th Apr, 2008 at 11:49:25am

7/16 across flats (AF) is a 1/4 thread. UNF or UNC.

iain
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Sold the turbo and seeing what the C20XE can do!

Near Lincoln

20th Apr, 2008 at 01:49:44pm

just get cap head screws in there. no need to fook about changing thread sizes, just increase the tensile strength!

Rod S

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Formally Retired

Rural Suffolk

21st Apr, 2008 at 12:21:30pm


On 20th Apr, 2008 Mirage said:
7/16 across flats (AF) is a 1/4 thread. UNF or UNC.

As earlier in the thread, yes, standard UNC/UNF would be 7/16"AF on a 1/4" bolt.
But on the later boxes they used strange UNC bolts (often replacing where studs/nuts had been used previously) with a shouldered head bolt, one size down from standard on the head.

I can only guess (from the fact it was a shouldered head) that it was to aid automated assembly. But it does mean all the 5/16" UNC bolts of this design had a 7/16"AF head. And the majority of the box is 5/16"UNC, the only 1/4" thread I can think of is the one holding the speedo drive in.

Schrödinger's cat - so which one am I ???

Alex

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Woolavington, Zummerzet

21st Apr, 2008 at 05:40:42pm

The shouldered bolts don't tend to have washers, so Rover were saving money !!

It is also a LOT easier to do the block-to-'box ¼" bolts with the wonky heads, as a spanner fits in there better.

Metric is for people who can't do fractions.
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