ENGINE BLOCK DURABILITY TEST

摘要

The method is for the preparation of a test piece for use in a durability test of an engine block (100) which contains hollow cylindrical formations (105) separated from each other by intermediate walls (115). Each wall contains a bolt hole (110). The method involves the removal of a test piece which contains a bolt hole. The test piece contains first and second ends and is removed so that the bolt hole has its aperture in the first end and so that the bolt hole extends axially into the test piece. A further end of the test piece is formed so that it can engage with an axial hydraulic exhaustion test rig. The central part of the test piece is lathed or cut to a circular cross-section so that the part containing the bolt hole is coaxial with the lathed or cut cylindrical part. The circular cross-section of the test piece is lathed or cut to a diameter preferably of 32 mm. In a further stage, the test piece is formed to a length preferably of 180 mm. A dummy test assembly is brought into engagement with the bolt hole of the test piece for testing purposes. A dummy component with a through hole axially and a bolt with a head at one end are used and the bolt is pushed through the hole to a position where it is stopped by its head. The dummy assembly is engaged with the bolt hole in t he test piece and the bolt extending from the hole in the dummy component is engaged in the bolt hole in the test piece, so that another end of the dummy component locates against the surface of the first end of the test piece. The bolt engages in the bolt hole of the test piece by being screwed with a torque from 50 Newton meters plus 90 degrees displacement to 200 Newton meters plus 90 degrees displacement. The test assembly is then used to effect a pulsating exhaustion test.