A reconditioned exchange engine is the most practical solution for an MGB with a tired, worn, or damaged power unit. Rather than undertaking a full engine rebuild in situ, with all the associated time, tooling, and specialist machining that entails, a reconditioned engine arrives ready to install, with all the internal work already completed to a professional standard.
Exchange Process
Reconditioned engines are supplied on an exchange basis, with the customer's old engine returned as the core unit. Each engine is stripped, inspected, and rebuilt with new or reconditioned internal components as required, including bearings, pistons, rings, gaskets, and oil seals, and is fitted with an unleaded-tolerant cylinder head to ensure compatibility with modern pump fuel.
Identifying the Correct Engine
The correct engine specification depends on the car's engine prefix and production period. The MGB used many different engine series across its eighteen-year production run, each tailored to the car's market, gearbox type, and emissions requirements. The engine prefix is stamped on a plate on the right-hand side of the block, just below the cylinder head, and should be confirmed before ordering. Five standard reconditioned engine specifications cover the full production run, three main bearing 18G/GA engines from 1962 to 1964, five main bearing 18GB from 1965 to 1967, five main bearing 18GD/GG from 1968 to 1971, five main bearing 18V chrome bumper from 1971 to 1974, and five main bearing 18V rubber bumper from 1975 to 1980.
Reconditioning Levels
Two levels of reconditioning are available, a standard scheme and a premium scheme incorporating an increased number of new parts over and above the standard specification. The premium option provides additional reassurance for owners who want the highest standard of rebuild, or where the old engine's condition suggests that more extensive renewal is appropriate.
Installation
When fitting a reconditioned engine, all ancillary components should be inspected and renewed where necessary, engine mountings, cooling hoses, fan belt, oil cooler hoses, and clutch components are all items that should be addressed at the same time rather than disturbed again shortly after installation. The carburettors, ignition timing, and cooling system should be checked and set up correctly once the engine is in the car and running.