Hi, Happy New Year to every one!
Last year I bought a Mainship 2005 trawler
with twin Yanmar
4LHA_STP engines which only recorded 300 hours. I have been driving it for 150 hours since May 2019. The engines run perfectly and temperature range at 75 degrees below 3000 RPM
and at 84 degree at 3400 PRM, and also I checked the impellers in good condition and the water
flow very normal. One of my experienced marine mechanic
reminds me that the engines need to do sea water service
since the record
shows the impeller pump
hasn’t been serviced since Feb-2011. But according to the manual, it only needs to check or replace the impeller at 1000 hours or 4 years and clear and check the sea water passage
at every 2000 hours. So my question is –do I need to check and clean raw water pump
, inter cooler, oil
cooler , after cooler and all the sea water passage
now? I used to have Yanmar
6LAPA, its manual says the sea water passage needs to be checked 1250 hours or every 5 years. Thus my other question is why 4LHA-STP only need to clear the sea water passage at 2000 hours but the 5 years? Does this mean 4LHA is a better built machine?The last question is what exactly mean in the manual “to clear and check sea water passage?” Does it mean I have to dissemble all the coolers and heat exchanges to check and clean them ? Thank you very much!