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  • Users: jeromero
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  1. jeromero

    Mechanical seal vs. packing in oil pumps

    I do not know if there is a code or regulation to select between packing system and mechanical seals in oil pumps. I think the selection has to depend on pressure, viscosity and temperature. Or is it obligatory to use mechanical seals in oil applications? I have consulted API 610, 685, 682 and...
  2. jeromero

    Turbine blades shape

    In some turbochargers the turbine blades have a kind of "groove" in the external edge. It is designed for making a gas turbulence or for another function. I am curious because this "grove" does not appear in other kind of turbochargers. Thanks, jeromero
  3. jeromero

    Low compression pressure in diesel engines

    Thank you for your answers guys. You canf find complete information in another forum submitted in Engine & fuel engineering section.
  4. jeromero

    Cylinder liner fracture

    You can see more information in other forum about the same topic that I began in Engine & fuel engineering.
  5. jeromero

    Cylinder liner fracture

    Chris-marine also recommended us to install an L-ring in the block and machine it to the original dimensions. Another question, in the upper zone of the bore according to the manufacturer specifications we have a clearance between 7 and 12 mils in diameter. Making a calculation of thermal...
  6. jeromero

    Cylinder liner fracture

    This engines have around 70000 hours of accumulative work. To sleeve the bore area is a good idea, although we repaired a similar block with welding. We have to check alternatives.
  7. jeromero

    Cylinder liner fracture

    Actually we have there are defects in the upper area of the bore for the liner in the block caused by freeting, we want to repair that areas, it could be a cause of fracture.
  8. jeromero

    Low compression pressure in diesel engines

    How did you measure the con rod bending?. I guess you change both con rods, after that the problem disappear?
  9. jeromero

    Cylinder liner fracture

    Yes this is the same cylinder. Somebody can think that the leaks were through the cylinder liner cracks, but even with new liner we had low compression pressure. We are investigating if both phenomena are related. Actually we have the same thermodynamic condition in other cylinders and in other...
  10. jeromero

    Low compression pressure in diesel engines

    willeng, could you explain more the procedure, I do not understand completely
  11. jeromero

    Cylinder liner fracture

    The engine is Allen Type 8S37G-HBA, there are not problems with piston or rings. The failure is always in the same zone, the bearings do not show signs of abnormal wear. The engine is operating always between 1.8 and 2.0 MWH of load.
  12. jeromero

    Low compression pressure in diesel engines

    About con rod bent. Actually we thought about that but we have no tools for measuring it. Even we are not sure of the con rod length. Metalguy, how did you detect the bent? We think in some reasons of changin volume in the chamber: Because of the age of the con rods they may well are deforming...
  13. jeromero

    Low compression pressure in diesel engines

    Thank you for your soon answers guys. We checked there are no leaks in combustion chamber nor problems with time in valves, they (intake and exhaust) are closing properly. We are using computer aided reciprocating machinery analysis: pressure, vibration and ultrasound signals taken in the...
  14. jeromero

    Low compression pressure in diesel engines

    Sorry, there are NO leaks in combustion chamber (typing mistake). We check rings and valves many times and everithing is OK, the same with the injection.
  15. jeromero

    Cylinder liner fracture

    Thank you for your soon answer. The application is continuous electrical power generation (2 MWH), the failures have hapenned in normal operation. We have cooling water temperature monitoring and and in the failures we don't see big changes in temperature. Only once (a years ago) we had a...
  16. jeromero

    Low compression pressure in diesel engines

    In 3200HP diesel engine we have a particular thermodynamic behavior in a particular cylinder, monitored buy a pressure sensor that relates pressure with crankshaft position and comparing with other cylinders: there are low compression pressure, low peak pressure and a big delay in peak angle. If...
  17. jeromero

    Low compression pressure in diesel engines

    In 3200HP diesel engine we have a particular thermodynamic behavior in a particular cylinder, monitored buy a pressure sensor that relates pressure with crankshaft position and comparing with other cylinders: there are low compression pressure, low peak pressure and a big delay in peak angle. If...
  18. jeromero

    Cylinder liner fracture

    In 3200HP diesel engine we have recurrent failure of cylinder liners. They fracture in the angle between the body and the settlement zone. We think the failure is related with deformations in the settlement zone in the engine block so we will grind this surface and also the upper part of the...
  19. jeromero

    Cylinder liner fracture

    In a 3200 HP diesel engine we have recurrent cylinder liner failures, they fracture in the angle between the body and the settlement zone in the block. We think the failure is related with deformations in the settlement zone in the engine block. Does anybody have known this kind of failures...

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