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Author Topic: Sheared bolts  (Read 3235 times)

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toller

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Sheared bolts
« on: 10 April 2007, 20:25:20 »
There's me thinking everything was going to be sorted ready for my MOT retest tomorrow.  Got myself a new coolant temp sensor but to get the old one off i had to remove the coolant bridge.

When putting it all back on this evening i have managed to shear one of the big bolts holding the brisge in place, the hollow ones with the 4 holes along it's length, i actually thought i'd stripped the thread in the engine block at first so it was a relief to find out it had only snapped.

By the looks of it the metal around one of the four holes in the bolt must have already been cracked as it's already corroded rather than being bright metal as you'd expect from a fresh break.

What i want to know is do these bolts have a torque vaule applied to them, and if so what is it?

Hopefully i'll be able to make a new bolt at work in the morning as the scrappy where i got the sensor from is a fair distance away, depends on if i can find the correct size bolt to start with :)

Bit of a bummer as i'd hoped to have everything back up and running today.  I do hope i can get my retest re-scheduled though, don't fancy spening another £50 :(
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Markjay

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Re: Sheared bolts
« Reply #1 on: 10 April 2007, 20:41:40 »
30NM, see 'Coolant bridge to cylinder head' in Marks DTM guide:

http://www.omegaowners.com/forum/YaBB.pl?num=1156365122/
« Last Edit: 10 April 2007, 20:42:31 by markjay »
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TheBoy

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Re: Sheared bolts
« Reply #2 on: 10 April 2007, 21:25:31 »
Sometimes banjo type bolts do shear on reuse, esp if they where tight to remove...
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toller

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Re: Sheared bolts
« Reply #3 on: 10 April 2007, 21:41:32 »
They were quite tight to remove, from the looks of the corrosion it lokos like the one that broke had already previously cracked anyway.  Just my rotten luck I suppose :)
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TheBoy

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Re: Sheared bolts
« Reply #4 on: 10 April 2007, 21:46:11 »
Quote
They were quite tight to remove, from the looks of the corrosion it lokos like the one that broke had already previously cracked anyway.  Just my rotten luck I suppose :)
Yes, I think they get damaged undoing them.  It happens to all of us :(
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JamesV6CDX

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Re: Sheared bolts
« Reply #5 on: 10 April 2007, 22:04:25 »
Are the remaining bolts out of the heads...
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tunnie

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Re: Sheared bolts
« Reply #6 on: 10 April 2007, 22:16:29 »
i know the feeling, i did the exact same thing on TheBoys first project car!

I got it out by putting a small socket extension across the sheared nut and rotating... came out surprisingly easily.

I sourced a replacement bolt from a scrappy, can't remember the values we torqued them too, not very much!
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TheBoy

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Re: Sheared bolts
« Reply #7 on: 10 April 2007, 22:19:12 »
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can't remember the values we torqued them too, not very much!
Thats because I didn't let you do it again ;D
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tunnie

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Re: Sheared bolts
« Reply #8 on: 10 April 2007, 22:33:23 »
Quote
Quote
can't remember the values we torqued them too, not very much!
Thats because I didn't let you do it again ;D

 :-[
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toller

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Re: Sheared bolts
« Reply #9 on: 11 April 2007, 06:22:20 »
Well I was hoping to make some new ones but having just checked them they're a silly sized thread.  Looks like i'll have to make a return trip to the breakers :(

Worst thing is i put the bolts to one side at the scrappy's thinking i wouldn't need them.  Bugger!!!
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Marks DTM Calib

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Re: Sheared bolts
« Reply #10 on: 11 April 2007, 08:32:54 »
My tip with removing aprts from a donor car is.......keep every bolt, nut, bracket etc you remove.....every one, they often come in very handy...
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TheBoy

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Re: Sheared bolts
« Reply #11 on: 11 April 2007, 08:35:20 »
Quote
My tip with removing aprts from a donor car is.......keep every bolt, nut, bracket etc you remove.....every one, they often come in very handy...
Top advice :y
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Markjay

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Re: Sheared bolts
« Reply #12 on: 11 April 2007, 09:23:57 »
Quote
Quote
My tip with removing aprts from a donor car is.......keep every bolt, nut, bracket etc you remove.....every one, they often come in very handy...
Top advice :y

This is my instinct as well, but some of us have both limited storage space and wives...  ;D

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hotel21

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Re: Sheared bolts
« Reply #13 on: 11 April 2007, 10:38:18 »
Quote
Quote
Quote
My tip with removing aprts from a donor car is.......keep every bolt, nut, bracket etc you remove.....every one, they often come in very handy...
Top advice :y

This is my instinct as well, but some of us have both limited storage space and wives...  ;D


You limited to just the one wife then?  Trade her in for girlfriend II - much more flexible!!   ;D
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Kevin Wood

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Re: Sheared bolts
« Reply #14 on: 11 April 2007, 11:39:06 »
If the bolts are prone to getting damaged during removal I'd buy a new pair rather than get them from a scrapper and risk another one break. Can't believe they'd be that expensive from VX?

(but ready to be proved wrong!)

Kevin
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