Peugeot 407 Pistons

Single Peugeot pistons at Kyalami Motorsport run R2,049-R2,175. AfricaBoyz, Boss Auto and Race Parts carry alternatives. A full set of four plus rings and bearings typically lands at R9,000-R15,000 before labour.

Blue start-up smoke, a metallic knock that fades once warm, and oil use climbing past 1L per service are the three main signs. A compression test showing one or more low cylinders seals the diagnosis.

A full rebuild including pistons, rings, bearings, gaskets and machine work lands at R35,000-R70,000 through an SA specialist. A replacement used engine through Pro Peugeot Spares often costs less and carries a 3-month warranty.

A cold knock that disappears warm usually points at worn piston skirts. A hot knock that gets louder with revs is more likely rod bearings. Either needs the sump off at minimum. Ignoring it turns a rebuild into a scrap engine.

In theory yes, but you still need the head off, sump down and cylinders honed. Skilled builders do a part rebuild, but most SA indies bundle it with bearings and gaskets since the labour is already there. Price the rebuild against a used engine.