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Home > Help Needed / General Tech Chat > 11 stud head fixing - thread size issue!

Strap-on

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Milton Keynes

6th Sep, 2008 at 04:30:12pm


Just had my block back form RobWalkerEngineering and one of jobs was two holes drilled and tapped for an 11 stud head fixing....

problem is...

the hole/thread (water pump end) is smaller in diameter than the other that was drilled and the other previous 9! The hole has also been drilled far enough down to enter the water jacket.

What's up with that?!?

Anyone seen this before?

Can you get smaller diameter studs?


Tom Fenton
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Rotherham South Yorkshire

6th Sep, 2008 at 04:44:05pm

Yes you can get smaller diameter studs.

As for going into the water jacket this is not a big problem just use some hydraulic sealer on the threads to stop any water being forced through.

I have to say though, really these questions should have been directed to Rob Walker engineering, as it could be construed as painting them in a bad light posting the questions on here.

Edited by Tom Fenton on 6th Sep, 2008.


On 29th Nov, 2016 madmk1 said:

On 28th Nov, 2016 Rob Gavin said:
 I refuse to pay for anything else


Like fuel 😂😂

Turbo Shed

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Epsom, Surrey

6th Sep, 2008 at 04:58:37pm

sounds like perfectly normal engineering but he should have told you about the smaller stud required

Strap-on

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Milton Keynes

6th Sep, 2008 at 05:21:52pm

cheers for the speedy response.

Tom - i have had NO problems with the work done by RobWalker - more than happy and the guy is a legend - just his machine shop is shut Saturday afternoons and I am putting together my short motor.

just foxed me is all.


retroracer1380

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Worcester

6th Sep, 2008 at 08:52:42pm

Its what the standard cooper S had Chris cos they used 10 studs and a bolt in the thermostat side 11th stud, got some kicking about if you need one if you havnt bought ARPs m8,
Oli

Strap-on

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Milton Keynes

6th Sep, 2008 at 09:44:44pm

cool Oli - i'll be in touch. just got a concern with oil pump mounting area to sort...

Sam

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Oxford

6th Sep, 2008 at 09:56:35pm

normall thing for the drillings to break through into the water jacket when going to 11 studs.

just crack some thread sealer on the bolt before you put it in.

On 19th Feb, 2011 Miniwilliams said:
OMG Robert that's a big one


Bat

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Bermingum

6th Sep, 2008 at 10:28:44pm

Hi,
Check it clears the water pump impeller *wink*
Cheers,
Gavin :)

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joeybaby83

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Isle of Man

7th Sep, 2008 at 02:02:21am

remember the bolt in the water pump end is only torqued to 20lb/ft not 50, like the rest of them

"Turbo's make torque, and torque makes fun"

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