XJS HE 1985 -Air rail rust
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You are not mistaken. The pump DOES supply fresh air to the air injection pipes....but the pipes go into the exhaust ports of the cylinder heads....thus exposure to exhaust gasses. The one-way check valve separates the fresh air side from the exhaust port side. 'Tis the side constantly exposed to exhaust that rusts out. Unless, of course, the check valve fails...which does happen from time to time.
Cheers
DD
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Andrew Fanshawe
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