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Post by jca on May 22, 2006 10:29:00 GMT
I have an 84 sunkiss 45 based in marmaris, ever since I brought it last october it has had a fuel fume problem when I run the engine, I have looked at the engine when its running but can not see any leaking fuel anywhere, there seem to be a 4" flexy hose much like a tumble dryer one coming from the back of the engine conpartment to the back of the boat but when I hold my hand over it no heat comes out of it, either side of the entrance hatch there are two black vents and I have to cover these up due the fumes that come out of them, the engine is not smoking and sounds good. will putting an fan in to vent the engine room be the way to go as it gets very hot in there
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Post by notorious7004 on May 22, 2006 13:11:45 GMT
That "flexi hose" should lead to a water muffler that leads to the outside of the hull. Is there water coming out of the exhaust? Are you sure you´re getting FUEL (Diesel) fumes or exhaust fumes? Your engine room should not be hot if the cooling systems is working good and there should not be fumes of any kind inside the boat if your exhaust is in good order. First determine whether your getting fuel fumes or exhaust fumes and then troubleshoot from there! What kind of engine does your boat have?
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Robin
New Member
Posts: 7
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Post by Robin on May 22, 2006 13:32:29 GMT
The 4" hose you can see almost certainly runs to the transom and is to supply fresh air to the engine, it doesn't need a fan. The black vents either side of the bridgedeck will be the vents to let hot air from the engine out, this air will be replaced by cool fresh air drawn from the 4" hose you saw. As to smell, there shouldn't be anything drastic except for a sort of hot paint smell wafting out of the black vents. If you can really smell diesel then there may be a fuel leak somewhere, a little disel makes a lot of smell.
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Post by jca on May 24, 2006 6:59:18 GMT
thanks for you replies, the engine is a 4108 perkins, the fumes are diesel, the exhaust is working, the engine room is very hot, fumes only come out of one of the black vents and having looked at the engine I can see no diesel leaks and none on the floor under the engine
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Post by toneill on May 24, 2006 10:59:49 GMT
I have a '87 Sun Legende with a Perkins; there were 3 - 3" hoses coming from the transom to the back of the engine. I replaced them this year (2 were partially crushed in the bilge area) and while in doing so only one was still hooked up to the vents in the transom. I must confess I thought the vents in the companionway were intake for the engine and the 3" hoses were for exhaust. You might want to see how many vents are mounted in the transom, and check their integrity. The Sun Legende has 4, three for the engine 1 for the galley exhaust.
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Post by notorious7004 on May 24, 2006 13:30:10 GMT
There seems to be 2 different problems with your engine; it should not be that hot in the engine compartment and there should not be diesel fumes. As for the temperature issue I can only suggest checking that all the vents are properly connected to the appropiate hoses and that your cooling system is working properly. As for the fumes, as Robin states, " a little diesel makes a lot of smell". Start your engine and check the injectors, and the lines leading to them. MAybe the leak occurs only when diesel is being pressure fed to the injectors. Tighten all fittings, check the lift pump and your Racor and secondary fuel filters and the lines that connect them all. If none of the above leak, then I can´t think of any other suggestions to give you. The 4-108 is a wonderful engine and simple to work on; good luck.
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rob
Junior Member
Posts: 24
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Post by rob on May 24, 2006 14:22:47 GMT
Another suggestion for the fumes might be the cold start device, it is near the air vent (the small metal dome on top of the starboard side of the engine), a small diesel leak there might go undetected and cause the smell. However, a too hot engine compartment would be my first concern, if engine operating temperature is correct and ventilation ok I can hardly see where it might come from..
Do you have a fan fitted near the alternator ? Not the small winglets commonly fitted to any alternator, but the biggish turbine-like fan almost as big as the alternator ? Air coming out of it is rather hot, so I wonder if you do not have one the alternator might be the culprit; I have two perkins engines in two different boats, one with fan and the other without, and their temperature is quite different..
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Post by jca on May 26, 2006 8:24:25 GMT
again, thanks for the info, am back in the uk now so will have another go at it next month and let you know the out come
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Post by jca on Sept 21, 2006 17:24:12 GMT
I still had the problem of a very hot engine and the the overheating light came on, I had a look around and found that the sea water intake filter was blocked so hopefully next time I take it out the engine will be cooler and all the other problems sorted out, I will let you know
rgds jca
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Post by jca on Nov 11, 2006 18:15:16 GMT
this time I found out that it was the raw water cooling pump that was worn out, I found out because it stoped pumping altogether the last time I was there, every time I go to the boat I learn more, mind you it costs to learn, thanks for all you help
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Post by notorious7004 on Nov 13, 2006 19:36:29 GMT
Probably the clogged water intake filter caused your impeller to run dry and that caused it to malfunction. Good idea to always carry a spare impeller. Those Perkins are great engines, just need a little TLC once in a while. While you´re at it get spare belts for the alternator and A/C compressor if you run engine driven refrigeration. Fair Winds!
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