Hi,

I know this is a car forum but figured you all have been so helpful in 
the past you may be able to help me with a problem I have on my bike..

My bike has a heat shield on the exhaust that mounts using M6 cap screws 
with about 6-8mm of thread..

The problem is that after reassembling the exhaust this weekend and 
going for a short 15-20 mile ride 2 of the 4 machine screws had fallen out..

When I assembled it I didn't use any thread locker so it is my fault..

I have now been looking at the thread lockers out there, specifically 
loctite and none seem to handle high temperatures that would be found on 
a bike exhaust, I would imagine a bike exhaust would get up to about 
300+ degrees C and the high temperature loctite only goes to 175 DegC 
and at that temperature it is only at about 25% of its full strength..

So what thread locker would you all suggest for this?
...and
Where can I order it online?

Thanks

put the thread locker on when the bike is cold
and also put on some of them locking washers to stop it from coming loose 
with the vibration
if the thread lock stuff is ok inside the engine I'm sure it'll be ok near 
the exhaust

"WipeOut"  wrote in message 
news:42d18dc2$0$29878$db0fefd9@news.zen.co.uk...

> Hi,
>
> I know this is a car forum but figured you all have been so helpful in the 
> past you may be able to help me with a problem I have on my bike..
>
> My bike has a heat shield on the exhaust that mounts using M6 cap screws 
> with about 6-8mm of thread..
>
> The problem is that after reassembling the exhaust this weekend and going 
> for a short 15-20 mile ride 2 of the 4 machine screws had fallen out..
>
> When I assembled it I didn't use any thread locker so it is my fault..
>
> I have now been looking at the thread lockers out there, specifically 
> loctite and none seem to handle high temperatures that would be found on a 
> bike exhaust, I would imagine a bike exhaust would get up to about 300+ 
> degrees C and the high temperature loctite only goes to 175 DegC and at 
> that temperature it is only at about 25% of its full strength..
>
> So what thread locker would you all suggest for this?
> ..and
> Where can I order it online?
>
> Thanks 

"WipeOut"  wrote in message
news:42d18dc2$0$29878$db0fefd9@news.zen.co.uk...

> Hi,
>
> I know this is a car forum but figured you all have been so helpful in
> the past you may be able to help me with a problem I have on my bike..
>
> My bike has a heat shield on the exhaust that mounts using M6 cap screws
> with about 6-8mm of thread..
>
> The problem is that after reassembling the exhaust this weekend and
> going for a short 15-20 mile ride 2 of the 4 machine screws had fallen
out..
>
> When I assembled it I didn't use any thread locker so it is my fault..
>
> I have now been looking at the thread lockers out there, specifically
> loctite and none seem to handle high temperatures that would be found on
> a bike exhaust, I would imagine a bike exhaust would get up to about
> 300+ degrees C and the high temperature loctite only goes to 175 DegC
> and at that temperature it is only at about 25% of its full strength..
>
> So what thread locker would you all suggest for this?


I use Loctite products regularly. AFAIK none of their screw, or retaining
compounds can withstand temperatures much above 200 C, and I don't know of
any similar product that does.
Fitting some decent star washers, might retain them better than conventional
spring washers, if that is what they have at present, but a sure way to
prevent them coming unscrewed, is to cross drill the heads of the cap screws
and wire them.
Mike.

The message <42d1c231$0$6297$ed2619ec@ptn-nntp-reader03.plus.net>
from "Mike G"  contains these words:


> cross drill the heads of the cap screws and wire them.


Which has the advantage of historical precedent and looks really clever, too.

-- 
Skipweasel.
Ivor Cutler - "Never knowingly understood."

On Mon, 11 Jul 2005 01:49:47 +0100, Mike G  wrote:


>
> "WipeOut"  wrote in message
> news:42d18dc2$0$29878$db0fefd9@news.zen.co.uk...
>> Hi,
>>
>> I know this is a car forum but figured you all have been so helpful in
>> the past you may be able to help me with a problem I have on my bike..
>>
>> My bike has a heat shield on the exhaust that mounts using M6 cap screws
>> with about 6-8mm of thread..
>>
>> The problem is that after reassembling the exhaust this weekend and
>> going for a short 15-20 mile ride 2 of the 4 machine screws had fallen
> out..
>>
>> When I assembled it I didn't use any thread locker so it is my fault..
>>
>> I have now been looking at the thread lockers out there, specifically
>> loctite and none seem to handle high temperatures that would be found on
>> a bike exhaust, I would imagine a bike exhaust would get up to about
>> 300+ degrees C and the high temperature loctite only goes to 175 DegC
>> and at that temperature it is only at about 25% of its full strength..
>>
>> So what thread locker would you all suggest for this?
>
> I use Loctite products regularly. AFAIK none of their screw, or retaining
> compounds can withstand temperatures much above 200 C, and I don't know  
> of
> any similar product that does.
> Fitting some decent star washers, might retain them better than  
> conventional
> spring washers, if that is what they have at present, but a sure way to
> prevent them coming unscrewed, is to cross drill the heads of the cap  
> screws
> and wire them.
> Mike.
>



For locking the threads on Lantern internals, the only solution we've  
found that works is concentrated saline . But you need a new nut bolt  
every time.

WipeOut wrote:


> Hi,
> 
> I know this is a car forum but figured you all have been so helpful in 
> the past you may be able to help me with a problem I have on my bike..
> 
> My bike has a heat shield on the exhaust that mounts using M6 cap screws 
> with about 6-8mm of thread..
> 
> The problem is that after reassembling the exhaust this weekend and 
> going for a short 15-20 mile ride 2 of the 4 machine screws had fallen 
> out..
> 
> When I assembled it I didn't use any thread locker so it is my fault..
> 
> I have now been looking at the thread lockers out there, specifically 
> loctite and none seem to handle high temperatures that would be found on 
> a bike exhaust, I would imagine a bike exhaust would get up to about 
> 300+ degrees C and the high temperature loctite only goes to 175 DegC 
> and at that temperature it is only at about 25% of its full strength..
> 
> So what thread locker would you all suggest for this?
> ..and
> Where can I order it online?
> 
> Thanks



Hermetite exhaust assembly paste will do the job. I have used it for a 
number of high temp applications including sealing in a loose exhaust 
valve seat on my lawnmower. Hasn't let me down yet. Available from all 
good motor factors and some bad ones.


Regards, Jim

"Guy King"  wrote in message
news:313030303432373942D22C1A48@zetnet.co.uk...

> The message <42d1c231$0$6297$ed2619ec@ptn-nntp-reader03.plus.net>
> from "Mike G"  contains these words:
>
> > cross drill the heads of the cap screws and wire them.
>
> Which has the advantage of historical precedent and looks really clever,

too.

Providing the wire is threaded in the right direction for each screw.:-)
I have seen some efforts where the direction of unscrewing has not been
taken into account.
Mike.