Guest Posted June 14, 2009 Share Posted June 14, 2009 We have found a little "issue" with our new boat, I suspect we have identified the fault but could do with some fresh thoughts. The engine is a Volvo Penta D3 deisel coupled to a pents S1 leg, both were fitted brand new in 2004 and have done 235 hours in total, we cannot find any record of it being serviced so we assume it has not been and is booked in for a service this week. The engine starts first time, runs very smoothly and quietly and seem quite happy pottering along just above tickover, the temperature guage is steadt but only reaches around 50 degrees c, this is confirmed by the water temperature within the calorifier which is about the same, she is pumping plenty of raw water and an inspection by removing the oil filler cap shows plenty of oil circulating. We have found that at normal river speeds she appears to be operating normally, however on opening the throttle after a few seconds the inspect engine light comes on and the alarm sounds, we of course shut off for fear of damaging a Â£11K engine. The alarm still sounds after the ignition is turned off and then turned back on, the computer does its engine checks and still sounds the alarm annd the warning light flashes even before the engine is even started! The oil level is fine but is thin and dirty for the engine and power steering, water level is fine on the sealed system and as I said earlier its pumping plenty of raw water and the engine temperature has not altered in any way. After some gratefully received assistance from the guys at Loke Marine Services who just happened to be passing we limped back at tickover speed back to our moorings again no smoke, overheating or unusual noises other than the darn alarm. I cannot thank you enough for all your help and assistance and hope to get the opportunity to buy you guys a pint sometime after discussing with a friend of mine over the phone this is his theory, feel free to add your own input, he suggested that it could be the oil pressure bypass valve, either faulty or operating due to a blocked filter, when demanding more power the oil pressure increases if the filter cannot cope with the increased pressure the valve will open allowing the oil to circulate unfiltered protecting the engine but the pressure switch would show reduced pressure as it is the filter that provides the back pressure, sounding the alarm, until the oil has thickened a little by cooling the valve is staying stuck open, he suggested, letting the engine cool a while, which we did, restarting the engine, which we did (alarm still sounding) blipping the throttle a couple of times to increase the oil pressure, which we did, (alarm switched itself off) Now it was allready booked in for a service at Sutton Staithe or I would have asked Loke Marine to do it but I am sure I can find a way of rewarding them for their invaluable assistance but would love to hear the inputs from anyone who can add some ideas / thoughts or who has had a similar occurance with thier boat Quote Link to comment Share on other sites More sharing options...
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