Abstract: An oil filter attaching structure for an engine has a stand hole communicated with a main oil gallery formed in a lower casing of an engine. The stand hole is formed therein with either one of two different length female threads, one length female thread part is for use without an oil cooler and the other length female thread part is for use with an oil cooler. A filter stand is formed having one end with a male thread part for use without an oil cooler, with a length which is longer than that of the one female thread part. The filter stand is formed with a male thread part on the other end for use with an oil cooler, having a length which is longer than that of the other female thread part. The filter stand has one end screwed into the stand hole. The other end of the filter stand has an oil filter attached. The same filter stand can be used on engines with or without an oil cooler. The filter structure allows visible confirmation of proper assembly.

Abstract: In an engine, an oil channel arrangement is formed between an outer periphery of a lower-case setting bolt and inner peripheries of a case-side bolt hole and a block-side bolt hole so as to prevent the flow of foreign matters as contained in lubricating oil flowing from a main gallery toward a crank journal. The oil channel has a cross section that varies between the main gallery and the crank journal so as to decrease the flow velocity of the lubricating oil flowing from the main gallery toward the crank journal. The decreased velocity of oil allows the foreign matter to settle by gravitational force in a collecting space.

Abstract: A cylinder head assembly having a camshaft axially supported by a cylinder head through a camshaft housing having a head oil passageway for guiding lubricating oil to those parts of the cylinder head which require lubrication. The camshaft housing is provided with an oil reserve chamber communicating with the oil head passageway. One end of a through-passageway communicates with an upper part of the oil reserve chamber, and the other end of this through-passageway communicates with a camshaft journal of the camshaft housing.

Abstract: A memory card is used on a card write and/or read apparatus which has a data bus with an arbitrary bit width and writes and/or reads a datum to and/or from the memory card.