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I've yet to find the bottle of Kroil or P'Blaster spray can.
1990 'lil red' Volvo 240 DL Wagon needs a new exhaust and new exhaust manifolds to had gasket (& studs & nickel anti-seize).
Stupidly, six years ago what was a used 240 cat back became one solid fully welded pipe at the Spokane Valley, WA Discount Muffler from header pipe to tail pipe. Ah, well.
So the used cat back is now very used. Before it falls off, I scoped 550$ of exhaust from new (no spin flange) header down pipe to the tail pipe with new cat there in.
Rust at the exhaust manifold studs and nuts. Rust has welded where the flange nut meet the manifold. Rust at the manifold to header pipe. And one hanger.
Recent research suggests the user of either muriatic acid (a dilution of hydrochloric acid to <9) or white vinegar. Eye dropper or toothbrush. Rather vinegar as it is far less reactive.
I understand with Kroil or Zep, as these have a rust dissolving action, it can take days, week, months. Cycle the heat by running the engine.
Have you folks use acid to free them rusty nuts and bolts like in the exhaust?
I understand Art won't perform exhaust repair anymore. I totally understand. Yet in an Uncle Old Duke-ism, an exhaust repair shop may be all shysters.
All flaky inside the rear muffler.
Thanks.
Dud-McDuffed
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Beh.
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