CarlM Posted Monday at 07:29 Report Share Posted Monday at 07:29 Hello starting to do a decoke on Herald and was feeling pleased that I had managed to release the three nuts on the exhaust manifold, with threads and studs intact. But I can’t drop the exhaust down pipe, it seems ‘mated for life’ and gentle persuasion not working. Any tips for work around or a more aggressive approach. Link to comment Share on other sites More sharing options...
Colin Lindsay Posted Monday at 07:58 Report Share Posted Monday at 07:58 Make sure all the bolts are removed; three on the Herald cast manifold, and it's not supported anywhere else below. Let it hang on its' own weight. Tap it gently with a hammer all the way round the flange, keep tapping and set up a good rhythm of fast regular taps. Eventually this will split the years of heat- and rust-related bonding and it will drop off. Be careful not to fracture the manifold; they're common until you need one. Link to comment Share on other sites More sharing options...
johny Posted Monday at 07:59 Report Share Posted Monday at 07:59 Well as a future recommendation flood difficult work areas repeatedly with penetrating oil WELL before starting the job. People put it on 10 mins before starting to undo whereas 10 days before is more like it😁 Now heat is your next option in the form of a gas burner but dont set anything alight! Link to comment Share on other sites More sharing options...
Pete Lewis Posted Monday at 08:07 Report Share Posted Monday at 08:07 38 minutes ago, CarlM said: But I can’t drop the exhaust down pipe but why if the flange has parted just remove the manifolds leave the pipe to dangle or lift the head complete with manifolds if you eat plenty of spinach does the down pipe really need removing ????? Pete Link to comment Share on other sites More sharing options...
CarlM Posted Monday at 08:46 Author Report Share Posted Monday at 08:46 Pete the flange hasn’t parted, despite smacking it (piece of wood and hammer method). Link to comment Share on other sites More sharing options...
Pete Lewis Posted Monday at 11:49 Report Share Posted Monday at 11:49 (edited) ok so the gasket and probably some historic sealer has removed the need for any bolts Ha! i can only suggest a gentle pry and a good wiggle the flanges are in need of a bit of care as said they break off when you dont want them too. good luck let us know how you get it off Pete Edited Tuesday at 11:42 by Pete Lewis Link to comment Share on other sites More sharing options...
CarlM Posted Monday at 16:58 Author Report Share Posted Monday at 16:58 Some good advice here, followed the Colin method, and in 24 hr the flange has parted by 1/8 th of an inch, under its own weight and with copious amounts of bulldog bdx. Good progress considering yesterday was tight. Just applied more bulldog and taps with hammer and will await further parting of the ways tomorrow. something about patience being a virtue…. Link to comment Share on other sites More sharing options...
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