Ancestry24 Careers24 Entertainment Fin24 Food24 Health24 Kalahari.net Mobile News24 Property24 Weather24 Wheels24 Women24 Sport24
Answerit

Resolved Question

Can you weld up a crack in the exhaust manifold of a car? is this wiser and cheaper than replacing the manifold?

Can I fit a branch instead? If so, what benefit would i get from it? 59 mths ago

Best Answer

Just fix the old one. Branches are free flow unit. Gets better flow and more noise for your big bucks. If you are young and windgat - get branches. If you are older and wiser - repair.

59 mths ago

Answers -

I would rather have my manifold replaced by a company that you can go back to should you not be happy with your results.

59 mths ago

Yes , Yes and yes.

59 mths ago

Yes, but go to a specialist. Both cast iron and aluminium require special welding techniques.

59 mths ago

yes you can. before you start... grind and clean the area around the crack, widen the crack to about 2/3 of the material thickness, use cast iron welding rods low amps. by using your welding rod as a length measure weld about half the length of the rod, stop, you must ping (tap on the section) of the weld lightly to remove any flux, your first run must be in the centre(the V OF THE CRACK). YOU MUST CLEAN EACH TIME YOU WELD, remove all the flux, take your time and clean properly, the second run must overlap the first weld and the material on the side, the third run must be the same on the other side, the fourth weld must begin in the centre again. but remember after each weld to clean and ping. do not attrmpt to fill he crack with one single run. must be done in stages, after welding, cover weld with asbestos blanket and let it rest and cool down, do not cool down with water, if you do it will crack again, do not use until absolutely cold. this is very time consuming and welding should last if done properly

Source: From Hennie qualified boiler maker/welder

59 mths ago

Hennie is on the right track, but this in not a DIY job ulless your welding is really good. I hear it also helps to get the manifold hot by lying it in the sun before welding. Maybe check prices on a used manifold or branch at a scrapyard.

59 mths ago

replace its cheaper than the welding

59 mths ago

welding cast iron is no joke, I can weld prety well, have built my own monster traylors and would not attempt to weld the cast iron manifold!! branches will be a great idea!! they do improve the efficency of the engine!! more power and better fuel consumption if its done right!! depending on what car could also alter the ans!! some cars second hand manifolds are plenty and cheap!! some you are going to pay a fortune for an original part and branches will be the way to go!!

59 mths ago

Answer more Questions in General - Cars & Transportation

Browse more Questions in General - Cars & Transportation

Vote for more Answers in General - Cars & Transportation