Check for carbon adherent to ports and clean them. Check for scaling and corrosion in water jacket part. Conduct hydraulic test fro 7 bar or die penetration test. In valves check for sulphuric acid corrosion and bent valve seats. Check for high temperature corrosion on valve seats. check for adhered carbon and blow by. replace worn or bent valves. check for corrosion or crack in springs.
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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