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Suspension bolts & the MoT?

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Ted
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PostPosted: 11:31 - 14 Nov 2017    Post subject: Suspension bolts & the MoT? Reply with quote

Probably a bit of a can of worms here.

Would an 8.8 rated bolt on a mono shock unit be an MoT pass/fail?

This is more of an academic question than anything else, as I'm intending to buy a new (correct) bolt, but I'm just intreged...
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Monkeywrenche...
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PostPosted: 11:41 - 14 Nov 2017    Post subject: Reply with quote

https://www.mot-testing.service.gov.uk/documents/manuals/m1s02000401.htm
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ColinK98
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PostPosted: 12:24 - 14 Nov 2017    Post subject: Reply with quote

that looks very similar to the back of my CBF.
That should be a CAP head bolt which sits in the recess on the left.

as a normal bolt is smaller in diameter than the recess, how are you stopping it from having excessive movement ?

id suggest the MOT bloke is going to have a look and might refer to this part of the rules

deliberate modification which significantly reduces the original strength, excessive corrosion, severe distortion, a fracture or an inadequate repair of a load bearing member or its supporting structure


its most probably not that use of that bolt but rather the bolt not fitting correctly.
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arry
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PostPosted: 12:25 - 14 Nov 2017    Post subject: Reply with quote

Would seem it's a bit grey and I'd expect it to get an advisory only, subject to it actually being secure.
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ColinK98
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PostPosted: 12:26 - 14 Nov 2017    Post subject: Reply with quote

Also if it is the read end of a CBF the correct CAP bolts cant be found at Screw fix/Tool station.

you have to get them off the inter webs.

im 99% sure when i replaced my one, i ordered a spare.
happy to dig it out and post it if it helps.
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Polarbear
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PostPosted: 12:27 - 14 Nov 2017    Post subject: Reply with quote

I would suspect if there is no play in it you would probably get away with it as the tester won't be specifically looking at the bolt.

If he detects play and then has a good look I would expect that to be a fail.

This is purely guess work though, going on how my tester checks the suspension.
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stinkwheel
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PostPosted: 12:37 - 14 Nov 2017    Post subject: Reply with quote

8,8 should be strong enough in terms of tensile strength. You're using a locknut so there are no worries regarding security.

Therefore it's all down to fit. Of there is no play and it's not fouling anything, I see no reason it shouldn't pass. If there is play, it should fail.

You could probably argue that there shouldn't be a threaded section inside the shock bushing too but the MOT tester can't see that.
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piazza
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PostPosted: 12:52 - 14 Nov 2017    Post subject: Reply with quote

It looks like the bolt is already bending to my eye. I'd be changing it regardless of MOT decision. It's probably less than a fiver for the right one fom Amazon.
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Ted
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PostPosted: 13:21 - 14 Nov 2017    Post subject: Reply with quote

It is a CBF, and yes the original bolt head sits in a recess. I had to make a spacer out of the original bolt head (photo attached).

As I fitted a second hand shock I needed to test it, so couldn't just fit the bolt without a way of holding it firmly.
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Ted
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PostPosted: 13:24 - 14 Nov 2017    Post subject: Reply with quote

piazza wrote:
It looks like the bolt is already bending to my eye. I'd be changing it regardless of MOT decision. It's probably less than a fiver for the right one fom Amazon.


That's just my photography skills. Sad
Lol
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Paddy.
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PostPosted: 13:46 - 14 Nov 2017    Post subject: Reply with quote

I'd be amazed if anyone gave a toss. Chuck a bit of black paint or dirt on it and thats that done.
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Courier265
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PostPosted: 14:14 - 14 Nov 2017    Post subject: Reply with quote

Paddy. wrote:
I'd be amazed if anyone gave a toss. Chuck a bit of black paint or dirt on it and thats that done.


Ah the tight fisted approach....
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GT200Fan79
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PostPosted: 14:41 - 14 Nov 2017    Post subject: Reply with quote

I’m boring the centre out of all my suspension bolts anyway. For speed add lightness.
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Paddy.
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PostPosted: 16:25 - 14 Nov 2017    Post subject: Reply with quote

Courier265 wrote:
Paddy. wrote:
I'd be amazed if anyone gave a toss. Chuck a bit of black paint or dirt on it and thats that done.


Ah the tight fisted approach....


Not really, like you I couldn't reach the top shelf with the proper nuts and bolts.
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arry
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PostPosted: 17:58 - 14 Nov 2017    Post subject: Reply with quote

There's a back story here, I'm sure of it. I'm just not in the picture.
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Paddy.
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PostPosted: 18:12 - 14 Nov 2017    Post subject: Reply with quote

arry wrote:
There's a back story here, I'm sure of it. I'm just not in the picture.


Neither is he. Tripod too high.
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Paddy.
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PostPosted: 19:49 - 14 Nov 2017    Post subject: Reply with quote

arry wrote:
There's a back story here, I'm sure of it. I'm just not in the picture.


Courier for 901639164 years, can't ride bikes because they are too tall, has issues with a monkey bike by the sounds of it.
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Courier265
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PostPosted: 21:30 - 14 Nov 2017    Post subject: Reply with quote

arry wrote:
There's a back story here, I'm sure of it. I'm just not in the picture.


Bottom line is modern motorcycles have higher seats than older bikes which means I can't get BOTH feet on the ground at standstill which makes my choice of the next bike very hard.

My CBF500 is perfect, however the latest model CB500 has a higher seat and can't get the feet on the ground.

Sadly some smart arses on this forum are taking this as ever so funny.
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Nobby the Bastard
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PostPosted: 21:37 - 14 Nov 2017    Post subject: Reply with quote

Courier265 wrote:
arry wrote:
There's a back story here, I'm sure of it. I'm just not in the picture.


Bottom line is modern motorcycles have higher seats than older bikes which means I can't get BOTH feet on the ground at standstill which makes my choice of the next bike very hard.

My CBF500 is perfect, however the latest model CB500 has a higher seat and can't get the feet on the ground.

Sadly some smart arses on this forum are taking this as ever so funny.


Jebus, just how short are you? I'm short....
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Paddy.
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PostPosted: 22:14 - 14 Nov 2017    Post subject: Reply with quote

I can't put both feet down when I rode my TTR600, didn't die. Did ride. Just incompetent rider too short for this world.
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Ted
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PostPosted: 22:43 - 14 Nov 2017    Post subject: Reply with quote

My CBF is too low for me really, and I keep catching my feet on the road on roundabouts and tight corners. Sad
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Islander
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PostPosted: 23:02 - 14 Nov 2017    Post subject: Reply with quote

Nobby the Bastard wrote:
Courier265 wrote:


Bottom line is modern motorcycles have higher seats than older bikes which means I can't get BOTH feet on the ground at standstill which makes my choice of the next bike very hard.

My CBF500 is perfect, however the latest model CB500 has a higher seat and can't get the feet on the ground.

Sadly some smart arses on this forum are taking this as ever so funny.


Jebus, just how short are you? I'm short....


Apparently he's a lawn ornament. Laughing
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Pete.
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PostPosted: 06:59 - 15 Nov 2017    Post subject: Reply with quote

Doubtful that MOT would notice but what you've put in is a long way from being adequate IMO. It's already visibly bending in the photo.

You've removed a M12 fine thread shouldered cap screw for a hardware- store M12 coarse bolt. Just losing the shoulder and measuring down to the thread's minor diameter loses you 71% of cross-section. Now the bolt (screw, actually) that's fitted is probably 8.8 grade but socket cap heads are 10.9 or 12.9 - each 125% and 146% stronger respectively - that's if the new fastener even reaches 8.8 spec.

A 71% reduction in cross-section and possible 65% reduction in strength makes your replacement bolt as poor as 46% the capacity of the one you've replace.

Time to re-evaluate what you have there IMO.
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Ted
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PostPosted: 07:48 - 15 Nov 2017    Post subject: Reply with quote

Pete. wrote:
It's already visibly bending in the photo.




It's not bending at all, as previously said that's poor photography, also the double nut I think plays tricks on the eye. Considering that in that photo the only weight on the bolt was the swingarm and wheel, and it had only just been fitted, I'd be very concerned if it had bent!

Everything else I'm in agreement with.
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arry
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PostPosted: 08:02 - 15 Nov 2017    Post subject: Reply with quote

Paddy. wrote:

Courier for 901639164 years, can't ride bikes because they are too tall, has issues with a monkey bike by the sounds of it.


Ah, I see. Did this all happen in a previous incarnation or is this an actual new user with actual issues?
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