Why does the engine shut off in the heat?
Q I have been overhauling an air-cooled Lister Petter engine and have changed the pistons, piston rings and cylinder head gasket. After five minutes of running, the engine shuts off due to overheating. We tried spraying water on the cylinders and with that it shuts off in 15 minutes. Can you help?
NAEEM M. ABD EL RAHMAN GOMAA, via email ( Kuwait)
A TONY REPLIES… Does it have all its air ducting (including between the cylinders) correctly orientated and in place? Some models have the cooling air fan cast into the flywheel while others have a separate belt-driven fan assembly. In all cases the ducting between fan, cylinder fins, and air outlet must be in place. If the cooling fan and ducts are correct, questions have to be raised about the ring gap and the big end bearings: were they checked for backing, butting and nip? Finally, are you sure the pump timing is correct?