There was a hairline crack on the manifold of my tractor. Got all bolts loosed except for one which cracked. I drilled a small hole and put in a screw extractor from a set (see below link). 7mms wrench is too small to turn it and it spins on the 8mms. What else could I grip the square screw extractor with?. Sockets won't catch it. I'm afraid the grips would only round screw extractor.
Cracked manifold bolt.
- Thread starter sh40
- Start date
- Location
- Devon
Could you sacrifice an 8mm spanner, blob of weld maybe?
TripleSix
Member
- Location
- Helmsley, North Yorkshire
Weld a nut to it.
Undo it whilst it's still hot.
Undo it whilst it's still hot.
I can only do a 180 degree turn as it will catch off the engine so the wrench would have to come off.
Can't as it didn't leave enough tread sticking out to weld a nut.
- Location
- East Sussex
As above. I’d think twice about giving an extractor too much.
TripleSix
Member
- Location
- Helmsley, North Yorkshire
Weld a washer to it first then weld a nut to it.
Yes I'm thinking that will be the next thing to crack?
There's is very will left to weld to now as I have drilled a 5mms hole through the middle to get the extractor in.
TripleSix
Member
- Location
- Helmsley, North Yorkshire
Drill it out and retap it then.
I hope your first hole was central
I hope your first hole was central
spanners and hammers
Member
- Location
- cambridgeshire
if you already a lot out drill again with a left handed drill bit it will either drill most of the stud out and then clean retap or sometimes they spin the last of the stud out
Done that many times,even if the bolt is broken below the surface pulse the welder until it is high enough to weld to the washer and then weld a nut on and gently rock backwards and forwards to release the bolt,be careful with stud extractors as they expand the remaining stud and make it tighter in the hole,you could try tapping a torx bit into the hole in the stud,there is no golden rule it's whatever works,also when stud is hot from welding put a candle on it as it penetrates the threads but won't evaporate like wd40
- Location
- Ardrossan Ayrshire
A 12 point socket will grip a square head.
Spotty Dog
Member
- Location
- Northumberland
The handle from a tap and die set.
No because the sides coming out of the tap wrench either get caught on alternator, engine or manifold.
Use an extension bar from a 1/4" socket set to extend the stud extractor.
Then swear slot when the stud extractor shears off, then weld a nut on.
Swear some more when the nut shears off, try a left hand drill bit, find out that it isn't centred properly, then it breaks and you consider setting fire to the damn thing and claiming on the insurance if only you hadn't posted on the internet that the stud had broken off...
- Location
- East Sussex
bravheart
Member
- Location
- scottish borders
This might get it
pretty handy if you’ve got the room.
(No because the sides coming out of the tap wrench either get caught on alternator, engine or manifold.)
Remove alternator to make room for tap wrench, not that big a job on the whole scheme of things.
or an “all drive” socket on the stud extractor, think that’s what they are called.
or as said keep drilling.
pretty handy if you’ve got the room.
(No because the sides coming out of the tap wrench either get caught on alternator, engine or manifold.)
Remove alternator to make room for tap wrench, not that big a job on the whole scheme of things.
or an “all drive” socket on the stud extractor, think that’s what they are called.
or as said keep drilling.
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