EXHAUST MANIFOLD STUD

Muckyay · Post by **Muckyay** » Fri Apr 29, 16 8:08 pm

Having gone to replace what i thought was a leaking manifold gasket i have found that the back manifold stud on the drivers side is in a bad way, its buggered and the thread in the block is too. Im thinking i need to re-tap the hole in the block and use a slightly larger stud? Obviously this stud goes into a water jacket so needs to be done properly. Any ideas??

challenger · Post by **challenger** » Fri Apr 29, 16 8:33 pm

its a fairly simple job assuming you have room to get a 90 deg drill down there aswell as a tap, drain cooling system first drill out to larger size but remember to make sure exhaust manifold is large enough to accomodate the larger stud, remember to seal the thread with rtv. obv if there aint room for the drill its head off time

Muckyay · Post by **Muckyay** » Fri Apr 29, 16 8:38 pm

Will be a squeeze to get a drill down there but will see how we go! Theres not much room there on the old Valiant!

drewcrane · Post by **drewcrane** » Fri Apr 29, 16 10:55 pm

I had the same problem, and used a 90 degree drill,I had no luck,ended up building a new engine,

but if you pull the head, it will be much easier, I know not a good option, but if you booger it up on the car ,it will have to be pulled anyway,I KNOW very frustrating ,good luck

MilesnMiles · Post by **MilesnMiles** » Sat Apr 30, 16 9:10 am

An alternative suggestion. I have thick TTI gaskets on my car and have used similar in the past. You might find that just 5 bolts will seal up with a good gasket, not the tinny thin crap that comes as standard. As you need gaskets anyway, why not get some and try that? Could save a real pain of a job for not much outlay.

http://www.ttiexhaust.com/Category-Misc ... langes.htm

Hughes engines can supply them.

Dart Vader · Post by **Dart Vader** » Sat Apr 30, 16 10:36 am

took my heads off, got them done locally by an engineer. re tapped and new stud, no drips now, great peace of mind and cheap to do. think it was 30 quid to have both done

Dave999 · Post by **Dave999** » Tue May 03, 16 2:42 pm

if you can get the stud out

heli-coil or uni-thread

http://www.uni-thread.com/

this obviously involves drilling it out to a bigger size

but avoids the larger stud.

if done well is just as strong as it was originally

access might be an issue

but I guess if you are willing to cut up the installation tool it too can be fitted into the chuck on a 90 degree drill attachment and be turned by hand

Dave