Abstract: An adapter system for use with an internal combustion engine flushing apparatus which permits connection to the crank case and the oil filter of internal combustion engines. A first adapter enables a conduit hose of a flushing apparatus to be connected with the drain plug port of an oil pan of the engine. In one form this first adapter fits within the drain plug port of internal combustion engines and a connector and upwardly directed hose are attached to the adapter. This adapter is intended to be permanently in place. In another form of the drain port adapter, the construction is relatively slim in overall depth thereby to facilitate location in awkward positions. An oil filter adapter includes adapter cap with an elongated threaded post which fits at the oil filter port leading to the oil filter adapter of the internal combustion engine. The cap for the adapter is connected to the post. The post is surrounded by a cylindrical ring which is part of the oil filter construction of the engine.

Abstract: Engine cleaning is affected at different times while the engine is running. Apparatus for cleaning internal combustion engines cyclically draws cleaning fluid from a reservoir by a pump, flushes the fluid through the block of the internal combustion engine, and returns the fluid to the reservoir. Tank selection valves alternately couple one of a pair of reservoir tanks to the pump, to the exclusion of another tank. One tank can be dedicated for use to clean gasoline powered internal combustion engines to preserve the characteristic color of the cleaning fluid, while the other tank can be utilized to clean diesel powered internal combustion engines. The system is operated through first flushing and soaking periods and through second flushing and soaking periods. A first tank in a pair is used to initially pump and recover cleaning fluid during the first flushing and soaking periods.

Abstract: An adapter system for use with an internal combustion engine flushing apparatus which permits universal connection to the crank case and the lubrication system of a large number of different sizes and types of internal combustion engines. The adapter system comprises a first adapter referred to as a crank case adapter enabling a hose of a flushing apparatus to be connected within the drain plug port of an oil path of the engine. This first adapter is provided with a mechanism to enable the adapter to fit within the drain plug port of substantially all automotive vehicle internal combustion engines without being threadably secured within the drain plug hole. A second adapter set or so called lubrication system adapter set is comprised of a plurality of different lubrication system adapter pieces which individually or in combination fit at the oil filter port leading to the lubrication system of the internal combustion engine.