Engine oil leak

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captrick	Engine oil leak		Lead	[-]
Posts: 195 05/08/08 16:29:02	Tags : None Not sure how much general interest on this. For a long time my Yanmar's oil consumption seemed unusually high. After 12 hours round trip motoring at 3300RPM it was down a quart-a lot. There was oil on the block near the filter, dripping into the bilge. I thought it was the oil pressure switch but sfter cleaning it off and checking carefully it turned out to be a small hex plug in a spare hole in the mount for the switch that was loose. I can't see how it loosened from vibration so I think it was never tightened. Local Yanmar rep said he had never seen that before. It remains to be seen if this solves my oil consumption problem. Rick 704-3
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pwinterfeld	Oil Consumption	#1	[url]	[-]
Posts: 108 05/09/08 05:03:01	If your RPM gauge is calibrated correctly - then I would consider 3,300 RPM is somewhat excessive and you should not be surprised on the high oil consumption - I would never run the diesel at more than 80% of max RPM ( roughly 2,700 RPM) I have motored for almost 150 hrs at 2,600 RPM and used one quart of oil. That said - I do check the engine over carefully in the middle of every season for oil leaks - as of to date I have not found any. Peter C'est la Vie Hull #746
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captrick		#2	[url]	[-]
Posts: 195 05/09/08 12:34:05	Peter, I'm guessing you may have the new 4JHB4 engine. My 4JHB3E is rated for 4000 max/3750 continuous and likes to run fast or it builds carbon as I've learned. I'll be happy if it burns only 1 quart in 150 hrs. Rick 704-3
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kenfischer	Engine	#3	[url]	[-]
Posts: 172 05/10/08 06:40:58 Moderator	I think the the change to the 4JH4 was closer to 900. I have hull 906 with the new engine. Ken Fischer 2005 C42 #906 "Solaria" 3 Cabin Pullman, Fin Keel, Mast Furling Main, 155% Genoa
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pwinterfeld	Owners manual	#4	[url]	[-]
Posts: 108 05/11/08 05:49:01	I may have been misguided - I looked at my ownwers manual and may have a different engine - the max rpm is 3,400 and the horsepower is 50. Everyone is talking 56 hp and higher rpm. The mystery deepens. So................. I will continue to consider 2,700rpm my max - also I get a SOG of 6.8 at that engine speed. I have not measured the Speed through the water because my impeller got munched by hoisting sling. Peter C'est la Vie Hull #746
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ajchan		#5	[url]	[-]
Posts: 153 05/11/08 16:53:37	Peter I have the same model of engine as you do, 4JH2 and I normally cruise at 2750 RPM. At that engine speed, I cruise at 7.5 knots on a 3 bladed 18" vari-prop. When I had the 3 blade stock prop, I was cruising at ~ 7.2. I just increased the prop pitch slightly to see if I can get the cruise up to ~8 knots, without straining the engine. Addison Threepenny Opera 1999 C-42 MK II, 2CP Wing #640 http://the-voyages-of-threepenny-opera.blogspot.com/
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tinolanza	Engine HP	#6	[url]	[-]
Posts: 212 05/15/08 12:35:04	Peter, We have hull #739 and it has the 56 HP Yanmar engine. The 50 HP was used in much earlier models, unless you got a left over engine. I would double check the model and capacity. It must appear somewhere on the engine. We normally cruise around 2900 RPM, but have also cruised at 3200 with increased fuel consumption but nowhere near the limit of the engine. I'd be curious to hear what you uncover with regards to engine specs. Tino Lanza, Dancing Dolphin (#739/3 cabin pullman, Westlake Village, CA)
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rbetzing	4JH3BE spec	#7	[url]	[-]
Posts: 60 05/16/08 06:01:52	The spec I have for the 4JH3BE Yanmar is: Continous rating output at crankshaft - 50 HP @ 3650 RPM Maximum output at crankshaft - 56 HP @ 3800 RPM The fuel consumption curve shows 1 gal/hr @ 2600 RPM and 2 gal/hr @ 3300 RPM Ron Desperado 2000 C42/2 cabin #708 San Diego, CA
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captrick		#8	[url]	[-]
Posts: 195 05/16/08 08:37:57	I motor more than half the time, due to a tight schedule or impatience or coming a long way upwind like back from Mexico, so I've tried to get good results from my engine and prop. The boat was delivered with a Martec feathering prop that was way overpitched and I didn't know enough at the time to adjust it. I think many skippers overpitch to keep the RPMs, fuel consumption and noise down at the expense of engine stress. The first clues were a lot of soot on the transom and that the top RPM was only about 2900. I'm told the 3E engine was a design tweak with new injectors to meet Euro emission standards. It was beefed up for higher top-end to squeeze out another 6 HP. Eventually I learned to flatten the pitch to get near max RPM, about 3600, about 8 kts in flat conditions, no sails. It was tough because fuel and noise got worse but the soot disappeared. Yanmar recommended running at hi RPM for many hours to clean out the carbon from having run overloaded. The realities one has to accept are that the feathering prop is not as efficient as a fixed one and the pitch is only optimum at max RPM, unless you have a real-time adjustable like AutoProp. At lower RPM my prop is underpitched, the engine is underloaded and boat speed less than it could be. I'm not happy with the fuel consumption since my idea of cruising is 1 gal/hr at 7 kts. It looks like most diesels get best economy around 2500-2800 and I can cruise there but push the throttle up every few hours to clean out the engine. The new H4 engine is a major redesign for lower RPM and better efficiency and I'm curious to hear how skippers like it and what prop they have. Oil consumption is another issue. Yanmar says I'm within acceptable range at 1 qt/50 hrs but other skippers get much lower. My problem may be a combination of never breaking in the engine properly because of the overpitched prop, carbon on the rings and leakage. Yeah I know consumption goes up with RPM but it still seems way too high. An engine job should not be due for many years. Rick 704-3
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nickwigen	Prop Pitch	#9	[url]	[-]
Posts: 216 05/16/08 09:16:31	Hi Rick, We have the same prop but with a 4JH(T) vintage 1995. The T means turbo. The normally aspirated engines of that time were 40 hp. Ours is 50 hp continuous, 55 hp for 1 hour. The boat is 1990 but some notes on the engine manual indicate it was new in 1995. There is no mention of an engine replacement but the installation is non-standard with regards to the muffler, etc. due to the turbo. We put the Martec on after we bought the boat in 1999. I agree with your comments about the feathering prop not being as efficient as the fixed 3-blade but only when motoring. ;o) From your description you certainly were way over-pitched at the start. The original recommendation from Martec also had us over-pitched so I got out the scuba gear and spent an afternoon making trial and error adjustments. I adjusted it to the point I could barely achieve 3600 rpm at full throttle in smooth water. The engine tended to smoke quite a bit so I backed it off until most of the smoke went away and the engine didn't sound quite so labored. We normally motor at 2700 to 2800 to get 6.8 knots in smooth water. Based on my early years of driving diesel tractors the engine sounds "happy" at this speed and loading. If we need more power then we can run up to 3600 at the expense of a dirty transom. My idea is that we can now get maximum power from the engine in an emergency. So far the only time I've run at that speed is for tests. For fuel efficiency I think the Autoprop is probably the best. We took a trip from the Columbia River to Vancouver Island in 2005 with Bob and Rick Teeter on Camelot. Our boats are identical except theirs is the standard 40 hp and they have the Autoprop. I would expect maybe a very slight advantage in specific fuel consumption with the turbo but probably no enough to measure. On the 36 hour run from Illwaco to Ucluelet under almost no wind Camelot with the Autoprop consumed about 15-20% less fuel than we did. Nick Wigen Ursa Minor #178 FK, 3-Cabin Portland, Oregon
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nickwigen	Further on Oil Consumption	#10	[url]	[-]
Posts: 216 05/16/08 09:23:42	I change the oil in the spring and fall. The longest interval was about 85 engine hours. The level was down about 1/3 liter after the 85 hours. Nick Wigen Ursa Minor #178 FK, 3-Cabin Portland, Oregon
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