In one aspect, the present invention provides an engine assembly, which includes at least one cylinder head including a first surface, and at least one camshaft cover including a second surface, the first and second surfaces together defining a passageway positioned next to a seal for reducing oil leakage. The passageway may be defined by a recess on at least one of the first and second surfaces.

A cylinder of an internal combustion engine, in which cylinder liner an oscillating piston is guided on a running surface wherein the cylinder line is fixed vertically by means of a collar between a cylinder housing and a cylinder head. The wet cylinder includes an outer side which deviates from a circular shape and/or a rotationally asymmetrical outer contour of the collar. The cylinder liner is fitted in a positionally oriented manner in a corresponding receptable of the cylinder housing.

A preformed article for a cylinder head, includes: a first portion where a first through hole is to be formed from an upper wall portion to a central portion which is a portion, of a bottom wall portion, forming a combustion chamber of an internal combustion engine; and a second portion where a second through hole is to be formed to the central portion from an outer wall portion (for example, the upper wall portion) positioned above an intake port which opens to the central portion. The first portion and the second portion are portions where a cooling water passage is not formed.

The invention relates to a method for producing a thermally sprayed, thin-walled cylinder liner for insertion into a cylinder crankcase and to a cylinder liner produced with said method.

Systems and methods are provided for a cylinder block having one or more bulkheads. The bulkheads provide a dual-wall structure that may enhance the stiffness of the cylinder block in bending and torsion. The bulkheads may also provide an oil drain to allow oil to directly drain through a hollow core of the bulkhead. An overflow outlet may be formed in an inner wall of a bulkhead. In some implementations, a cylinder block with bulkheads may increase an oil capacity of an engine.

The masking member comprises a matching surface mask portion to mask the matching surface with the cylinder block, port hole mask portions to mask openings of the intake ports and the exhaust ports, and a between openings mask portion to mask a region which is sandwiched between the openings of two adjacent port holes. The matching surface mask portion is linked directly to the port hole mask portions without any steps, and the between openings mask portion is linked directly to both of the port hole mask portions without a step.

Disclosed are an engine having a cylinder block and a method for manufacturing an engine having a cylinder block. The engine may include cylinder liners each having a cylinder space formed therein, a protruded portion formed on an outside circumference thereof, and a flat surface formed on one side of the protruded portion. The cylinder liners may be arranged such that the flat surfaces of adjacent cylinder liners are in close contact with one another. The engine may also include a liner covering unit formed to surround an outside of the cylinder liners, and an outer block which forms a cooling water chamber with an outside surface of the liner covering unit.

A stator for a progressive cavity pump or motor includes a stator housing having a longitudinal axis. In addition, the stator includes a stator insert of a material moulded within the housing. The stator housing includes an outer tube having an inner surface. The stator housing also includes a plurality of framework elements disposed on the inner surface of the outer tube. Further, the stator housing includes at least one recess in the inner surface of the outer tube. The conjunction of the framework elements and the at least one recess define a plurality of chambers receiving insert material therein whereby the insert material is mechanically fixed axially, radially and torsionally within the outer tube.

A method of remanufacturing an engine block includes providing an engine block having at least one cylinder bore with a bore interior surface having a thermal spray coating deposited thereon, determining at least a portion of the thermal spray coating is out of specification, performing a laser texture ablation (LTA) process on the thermal spray coating to remove at least a portion of the thermal spray coating and leave a textured surface, and performing a thermal spray coating operation by spraying an additional thermal spray coating on the textured surface, to thereby prevent scrapping of the engine block with the out of specification thermal spray coating.