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 Topic: Carver Cascade 2GE Tie Rod Failure
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15/6/2013 at 3:15pm
Location: Rushden Northants
Outfit: Mercedes 614D Conversion
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It's a fairly well-known occurrence, but I hadn't expected mine to fail!
The water heater tie-rod holds the main water reservoir onto the heat exchanger, and normally I'd not have given it much of a thought, but I had to take the tank off mine today to get at something right by the wall, and the tie-rod just snapped off at the point where it screws into the heat exchanger.
The rod is aluminium, painted but unprotected where the water takes most effect, at the joint into the heat exchanger. Hard water is at its most corrosive where there is heat, and the pictures show what it does.
I think that the long-term answer is a bit of 316 or 304 stainless steel in there, but for now I've ordered a new anodised rod from fleabay, from which I shall take dimensions to have a batch of stainless ones made up.
The remains of the old one will need to be carefully drilled out, if the corrosion is really bad it may need a Helicoil inserted.
Might also try a sacrificial anode in there.
Peter
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