Abstract: Provided is a ferrule polishing material suitable for polishing a ferrule. A ferrule polishing material of the present invention solving the above object includes a binder formed from a resin material and abrasive grains dispersed in the binder. The resin material is formed from an epoxy resin. The abrasive grains are contained in an amount of not less than 80% and not greater than 91% with respect to the sum of masses of the abrasive grains and the binder, include small-diameter particles being particles having a particle diameter of not greater than 100 nm, the small-diameter particles being present in an amount of not less than 62.5% and not greater than 80% with respect to the mass of the abrasive grains, and are formed from silica.

Abstract: To provide a multi-core ferrule polishing material suitable for polishing a multi-core ferrule. A multi-core ferrule polishing material of the present invention addressing the above problem includes a binder formed from a resin material, and abrasive grains dispersed in the binder. The abrasive grains are contained in an amount of not less than 88.5% with respect to a sum of masses of the abrasive grains and the binder, include particles having a particle diameter of not greater than 100 nm, the particles being present in an amount of not less than 70% and less than 100% with respect to the mass of the abrasive grains, and are formed from silica.

Abstract: A gas cooler includes a pair of seal plates and a pair of first support ribs. The individual seal plate has a stepped surface which extends in a direction that a cooling portion is inserted into a casing. The individual first support rib supports the stepped surface. With the configuration where the stepped surface is supported by the first support rib, the inside of the casing is partitioned into an upstream-side space communicated with an introducing port and a downstream-side space communicated with a discharging port.

Abstract: A gas cooler includes a pair of seal plates and a pair of first support ribs. The individual seal plate has a stepped surface which extends in a direction that a cooling portion is inserted into a casing. The individual first support rib supports the stepped surface. With the configuration where the stepped surface is supported by the first support rib, the inside of the casing is partitioned into an upstream-side space communicated with an introducing port and a downstream-side space communicated with a discharging port.

Abstract: While enlargement of cover members attached to an engine body is avoided, the flexibility of the shapes of the cover members is increased and it is made possible to lead to a predetermined position drainage discharged from a cooling water pump attached to the external surface of a lateral wall of the engine body. A drainage discharge hole for discharging drainage is provided in a lower portion of a pump case. An engine side rib leads downward drainage discharged from the drainage discharge hole is integrally provided on an engine body forming part of the engine body so as to project from an external surface of a lateral surface thereof.

Abstract: While enlargement of cover members attached to an engine body is avoided, the flexibility of the shapes of the cover members is increased and it is made possible to lead to a predetermined position drainage discharged from a cooling water pump attached to the external surface of a lateral wall of the engine body. A drainage discharge hole for discharging drainage is provided in a lower portion of a pump case. An engine side rib leads downward drainage discharged from the drainage discharge hole is integrally provided on an engine body forming part of the engine body so as to project from an external surface of a lateral surface thereof.