Exhaust bolts

[cagey]

Just had an enjoyable afternoon releasing the 4 bolts holding the exhaust flange on my Beta, can anyone suggest what to put on bolts to prevent or ease this problem.
Thanks K

 

[Easticks28]

Copper grease.

 

[vyv_cox]

You can buy copper plated exhaust manifold nuts but also I agree, Copaslip was originally intended for this purpose.

 

[cagey]

Thanks everyone, I thought it was for brakes. The flange is held with bolts rather than studs and nuts.
Thanks again.
Keith

 

[rogerthebodger]

Brass nuts were generally used on the exhaust manifolds of cars but copper slip seems to have overtaken that now.

 

[Poignard]

Brass nuts were generally used on the exhaust manifolds of cars but copper slip seems to have overtaken that now.

'

My MGB had them and I use brass nuts on the steel exhaust flange studs on my BUKH engine. They are never difficult to remove.

I am not familiar with the OP's engine but if it was mine I would try and fit steel studs and brass nuts.

 

[rogerthebodger]

'

My MGB had them and I use brass nuts on the steel exhaust flange studs on my BUKH engine. They are never difficult to remove.

I am not familiar with the OP's engine but if it was mine I would try and fit steel studs and brass nuts.

All BMC engines used thick brass nuts on the exhaust stud nuts and also on the exhaust manifold to exhaust pipe clamp.

 

[earlybird]

Maybe I'm being over-cautious about copper based products on a Beta light alloy heat-exchanger casting. I'd prefer SS bolts with a smear of silicone grease.

 

[vyv_cox]

Maybe I'm being over-cautious about copper based products on a Beta light alloy heat-exchanger casting. I'd prefer SS bolts with a smear of silicone grease.

You are mixing technologies. Copper in conjunction with aluminium alloy is to be avoided underwater but absolutely no problem in air.

 

[alahol2]

Had the same problem, in fact sheared the head off two of the bolts. Replaced them with high tensile bolts with Copper grease. I now loosen/re-tighten each bolt in turn every winter as part of normal maintenance. I'm not going to go through that pain again.

 

[cagey]

Had the same problem, in fact sheared the head off two of the bolts. Replaced them with high tensile bolts with Copper grease. I now loosen/re-tighten each bolt in turn every winter as part of normal maintenance. I'm not going to go through that pain again.

You’ve hit the nail etc., thanks, this is what I’ll do, I was thinking all the time what a s-fest this will be if anything fails.
Thanks everyone
Keith

 

[alahol2]

I should have mentioned that the bolts where the head sheared off were not siezed into the heat exchanger. Once I had levered the exhaust flange off, they were no more than finger tight really. It was corrosion build up between the alloy of the exhaust flange and the bolt that caused the siexure.