The most important tip for buying a used Perkins diesel engine is, if at all possible, to view the engine in person before making a purchase. This allows the buyer to make sure vital components such as the cylinders, pistons and crankshaft are in good working order.
Buyers who do not personally have much knowledge of diesel engines should bring a diesel mechanic with them when viewing the engine. While some parts of a diesel engine, such as the fuel injectors and glow plugs, are easy and relatively cheap to replace, other repairs are very costly. Even if the mechanic requires a fee for this service, paying a mechanic for one afternoon is far cheaper than paying to replace dented cylinders or cracked crankshafts.