| The method of lubricating bottom end bearings of having oil cooled pistons is to supply the bottom end bearing with oil down a central hole in the connecting rod from the cross head bearing, the oil is supplied to the cross head bearing either by telescopic pipe or a swinging arm, advantage of telescopic pipe over swinging arm is that it got three glands while telescopic got only one. From cross head oil is supplied to guides, cross-head bearing, piston cooling and big end bearing. |
Since very small needle lift is obtained in the test equipment result in an unequal pressure distribution in the cut off shaft resulting in a hard contact in a small area along with high frequency oscillations, low lubricity of test oil will increase the chance of seizure. Full lift and high lubricity of heavy oil eliminates this risk of seizure during normal operation.( Always open and clean slide type valves before testing as cold sticky heavy oil along with small clearances can cause restriction in the movement of the spindle).
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