Removing bolts from an exhaust to manifold

[essexpete]

What is my best method? 3 bolts through a silencer flange into the manifold on a Perkins 6.354 (old JCB 814s). The bolts really do not feel as though they will move before shearing. If they had be studs it might have been less tricky.
Thanks

 

[livestock 1]

What is my best method? 3 bolts through a silencer flange into the manifold on a Perkins 6.354 (old JCB 814s). The bolts really do not feel as though they will move before shearing. If they had be studs it might have been less tricky.
Thanks

Often used to heat them up red then cool them with cold water, breaks the rust. The other option is to loosen them red but more likely to twist off.

 

[TripleSix]

What does it matter if they're just bolts?
Shear/snap, undo/cut and replace

 

[tomlad]

Bolting into the head or thru bolts on manifold so both sides accessible?

 

[Two Tone]

If the bolt snaps, I’ve seen it done by welding a nut on the end of what is left. The heat from the welder will loosen the stud/bolt and it will unwind out. But it may take a few attempts of welding the nuts on again before it works.

Cooling it with water can help because it causes the heat to run or chase it further down the thread to loosen them.

 

[livestock 1]

Local engineering fellas who are mostly gone now showed me as a youngster how to weld a nut on with chrome rods to get them out.

 

[roscoe erf]

I use the heat method or the weld on nut method but it depends on what the access is like have had them shear just drill out and through and replace with a bolt

 

[ACEngineering]

What is my best method? 3 bolts through a silencer flange into the manifold on a Perkins 6.354 (old JCB 814s). The bolts really do not feel as though they will move before shearing. If they had be studs it might have been less tricky.
Thanks

dont know about the 6cylinder older perkins but the 4cylinder 1000series most of the time you might as well just buy a new manifold cause there not that expensive really!

Brazing torch and heat the area around manifold were stud is then undo or like said heat the bolt then cool, some of them 3 bolt perkins flanges you can just drill them out and use a nut and bolt!

 

[Hardy_Spicer]

I'd try them off with a wrench instead of a socket and rachet (greater chance of them being sheared) then if you get them opened its a case of little by little back and forth opening then turning the bolt back a little then continuing to open

 

[thesilentone]

Give the bolts a tap with a punch smaller than the bolt head so as not to damage it, but big enough to have some impact.

It will help break the rust seal.

 

[davedb]

When I did my 814 silencer I cut the silencer box off out the way and got a socket and impact gun straight on them and steadily rattled them untill they came out

 

[essexpete]

When I did my 814 silencer I cut the silencer box off out the way and got a socket and impact gun straight on them and steadily rattled them untill they came out

That sounds like plan.

 

[Flatlander]

Seen a you tube video once of a man with solid truck wheel nuts. 4 ft bar wouldn’t move them. He heated the nut with a plumbing/soldering propane torch and melted candle wax into the thread. Didn’t get it too hot and the capillary action sucked the melted wax in. Once cooled they came undone pretty easy. Never tried it myself I welded an air hammer tool shaft to the back of a 1/2 inch Tbar for rusted bolts. The vibration shakes the sh!t out while you control the turning. Takes a bit of holding in some places but usually works

 

[Richy12]

Seen a you tube video once of a man with solid truck wheel nuts. 4 ft bar wouldn’t move them. He heated the nut with a plumbing/soldering propane torch and melted candle wax into the thread. Didn’t get it too hot and the capillary action sucked the melted wax in. Once cooled they came undone pretty easy. Never tried it myself I welded an air hammer tool shaft to the back of a 1/2 inch Tbar for rusted bolts. The vibration shakes the sh!t out while you control the turning. Takes a bit of holding in some places but usually works

I've used your method with the T bar when a friend lost the lock nut remover for his car, Worked fantastic there

 

[tomlad]

On trailer nut a mate would put 8ft bar on ,try to stand on that while wack t bar with 14lb hammer
Good to watch from afar

 

[Dry Rot]

I bought an old Jotul 118 log burner. I've been after one for years. Fantastic stoves, simple design -- that works. What I didn't notice was that all the 6mm studs holding the panels together were either completely rusted or seized. By chance, a local engineer is something of a specialist at this job and replaced them all for £6 each. The bill came to about £100 so you can work out how many! Sorry, don't know how he did it but I had planned on drilling them out and re-tapping the hole. I tried one and gave up!

 

[tomlad]

I had a symular job on a franco belge i bought of back of a scrappies tipper, monford i think
Renewed a few bolts , painted....
Absolutely best stove I've ever used