Why does the engine shut off in the heat?

Canal Boat - - Back Cabin: Experts -

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?

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