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Recent content by wr180561

  1. wr180561

    Starting Up a repaird engine

    After extensive pre-lubrication of the engine (liners & bearings), start the engine at low idle for less than one minute then stop it. Using an infra red thermometer, measure the temperature of the main and conrod bearings. Make sure that all bearing's temperature are nearly at the same level (...
  2. wr180561

    Bearing clearance

    Can some tell me what is the formula used to determine the clearances of bearings of diesel engines based on their diameters. The bearings I'm talking about are the main bearings for crankshaft, conrod bigend bearings, piston pin bearings etc... Regards WR
  3. wr180561

    Diesel engine wearing during the start up

    With the pre-lubrication ,oil temperature and jacket water temperature you've mentioned above, I do not see that wearing at start up is an issue specially that the engine is started on no load. For these type of engines running on HFO, wearing is more related to corrosion caused by the chemical...
  4. wr180561

    Stuck up piston

    Thanks all for your tips, however the piston is free now and was pulled off the liner all right (they have managed to jack it down by the cylinder head). The liner as well was pulled out to investigate a water leak from the sealing surface between the liner and the cylinder block. A small hole...
  5. wr180561

    Stuck up piston

    Mike, Would it be better if a special chemical compound is sprayed around the gab between the liner & the rings to assist in dissolving the carbon and thereby moving the piston while the grease is on action? Do you have any idea what the commercial name of this compound could be? Appreciate...
  6. wr180561

    Stuck up piston

    MIke, Thank you very much for your valuable tip. The piston has in fact been projected about 10 mm out of the liner and the question here, would the greasing procedure as described be capable of moving a piston of a medium speed engine with bore & stoke dimensions of 320mm, 450mm ? However...
  7. wr180561

    Stuck up piston

    A friend of mine got the piston stuck up while he was pulling it out during major engine overhaul. He said that the engine was running ok before they started the overhaul. It seems that there was heavy carbon deposition on the liner that was not properly cleaned before they pulled the piston...
  8. wr180561

    Can there be two solutions to steady state cooling

    I think running the engine without thermostat may overheat the engine since in this case it would achieve only partial cooling. I would say, replace the thermostat. However, want to know if this is a phenomenon that appeared sometime down the road of the engine life or it is there from day one...
  9. wr180561

    Emission Control Standards

    Can any one tells me where can I find detailed description/information of Tier 1 thru Tier 4 emission control standards, i.e. limits of greenhouse gases, range of effected diesel engines in terms of hp/kw, application of effected diesel engines; marine/power plant/trucks etc.. Any helpful...
  10. wr180561

    Cylinder liner honing

    Gentlemen, Let me give you some more information about this engine; it used for power generation, it’s output power is 3.85 MW, arranged with 16 V- type cylinders, rotating at 720 rpm and having bore diameter of 280 mm. As mentioned above, all liners are replaceable and therefore, neither...
  11. wr180561

    Cylinder liner honing

    Dear all, Thanks for your responses. Yes, it is a liner that is replaceable in a medium speed diesel engine. The liner is still within the wear limits but new piston rings will be installed, is it necessary to hone the liner in this case using a honing brush ? Regards WR
  12. wr180561

    Cylinder liner honing

    I understand that honing of cylinder liner is not a routine work. Can someone tell me when it is necessary to hone a cylinder liner? And what is the correct procedure for honing a cylinder liner? Regards - wr
  13. wr180561

    Waste Heat Recovery

    j2bprometheus is quiet write. The efficiency of a modern diesel engine can possibly be as much as 43 % but this is when the effect of turbocharging is considered. The 33 % which I previously mentioned, does not however take the effect of turbocharging into consideration. The heat available in...
  14. wr180561

    Waste Heat Recovery

    Note: We are talking here on large diesel engines of over 3000 Kw output. WR
  15. wr180561

    Waste Heat Recovery

    The application would be HVAC. Engine cooling water shall be used to preheat the feed water before an exhaust gas boiler, the generated steam will then be used to fire an absorption or adsorption chiller(s), this certainly would be used all year around. Has anyone tried a similar application ? WR
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