Rover V8 Cylinder Liner Corrosion and Internal Coolant Loss
SeriousEngineAutocar singles out the 4.6 as 'known for dodgy cylinder liners and springing internal coolant leaks', with the steel liners corroding the aluminium block and letting coolant into the combustion chamber where it vapourises - usually from about 90,000 miles onwards and an expensive fix, though the 4.0 is less prone. Hagerty describes the same family from the mechanical side: liners that slip and pressurise the cooling system, a cracked block that then overheats and damages a head gasket, and a blocked top radiator hose finishing the job. A reconditioned block is often the quicker, cheaper route than re-lining.
Coolant level dropping with no puddles under the car, Hard upper hose and bubbling in the expansion tank at idle, Thick sweet-smelling steam on cold starting, Overheating at idle in traffic after a motorway run
- Combustion-gas test on the cooling system before buying
- Records of coolant changes, hose and radiator replacement
- Whether the block or engine has been renewed, by whom and with what warranty
- Check the top radiator hose is clear and watch the gauge over a long warm drive