shorty
New Member
During winterising last year, opened and then removed lower drain cock. No water came out, even after pricking with wire. Removed head and pricked again from above. Some black powder could be removed from the drain hole. Seems that lower waterways around the cylinder are blocked with solidified black sludge, which is almost impossible to remove by pricking or flushing with clean water. Engine approximately 25 years old, otherwise runs well (with good water flow out)and does not appear to overheat (temperature alarm never triggered). Anyone with any ideas how to resolve this problem, without further dismantling of the engine?
