All UK-market ADO16s have an A-Series engine; 1098cc in 1100 models and 1275cc in 1300s with either one or two SU carburettors. The A-Series engine is tough and will take hard use (and even some neglect), and it can appear healthy – until it goes bang. The engine’s stabiliser mounting bar bushes disintegrate on post-1971 and automatic derivatives so try rocking
the engine back and forth. Worn bushes will be obvious from the excessive play; polyurethane items cost less than £5. The 1275cc engine is prone to worn valve guides and stem seals, so look for blue smoke when starting up, which then clears. Piston ring wear is also common, an issue that’s clearly betrayed by exhaust smoke on the over-run, but the engine will just keep going.