Engine room ventilation / oil leaks
Printed From: myHanse.com
Category: Hints & Tips
Forum Name: 341 / 342
Forum Description: 341 / 342 Hints and Tims
URL: https://www.myhanse.com/forum_posts.asp?TID=3871
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Topic: Engine room ventilation / oil leaks
Posted By: archipelago
Subject: Engine room ventilation / oil leaks
Date Posted: 12 April 2010 at 11:07
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I have a Volvo Penta 2020 on my Hanse. It has been leaking a little oil through several gaskets. The service guy says it could be due to high running temprature and deficient cooling system. We have used the engine up tp 3000 rpm, sometimes even 3200 rpm. The service guy suggests we make a ventilation pipe and a fan to the engine room. I wonder if this will help. The engine is supposed to be cooled by sea water. Do you have any better explanations for the leaks or better repairs for the cooling system. I have never seen any warning lights for the cooling system, nor are there any smells. The engine is ofcourse warm after use, but I am not convinced it is too warm. |
Replies:
Posted By: echoofwight
Date Posted: 12 April 2010 at 15:48
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I also have the VP 2020, 1300 engine hours so far and no problems with running hot. I don't have any oil leaks. Do you have a good flow of water from the exhaust when the engine is running? As you say the engine is sea water cooled and ventilating the engine compartment should make little difference Where is the oil leaking from?
Steve ------------- Steve. Hanse 341 Echo of Wight, . Deep draft and rudder, white hull, Single aft cabin. Raymarine instruments. Raymarine radar. Garmin AIS. Wheel Steering, Portsmouth. |
Posted By: archipelago
Date Posted: 13 April 2010 at 20:52
| There are two leaks, one in the rear end where the gear is joined with the engine and one in the front end so that the leak is visible as soon as I open the engine room box. They are both really small, like two drops a week. But it would be nice to have an explanation. The Gaskets will be changed this year because of the s-drive gasket renewal. |
Posted By: archipelago
Date Posted: 13 April 2010 at 20:55
| Yes and the water flow from the exhaust is not huge, it is spitting rather than pumping or cascading. That will have to be checked. I have not had any alarm lights for hot temperature so far, assuming that there is one. |
Posted By: Don Newport
Date Posted: 16 April 2010 at 23:16
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Have just spotted the title of this thread which has prompted a different thought in my mind. I am running a Yanmar 2GM20FC on our 341 - given that the engine air intake is within the engine bay, how can I be sure that there is adequate ventilation to the engine bay to ensure full engine efficiency? I am not aware that the engine bay is vented for this purpose, indeed it is very well insulated for noise etc; or is there some ducting which I have failed to spot?
------------- Don Newport ENIGMA, Hanse 341 (2003) berthed Hamble. 3 cabin, wheel steering, 1.75m draft, Yanmar 3YM30, Kiwi prop. |
Posted By: Gordon Harrison
Date Posted: 17 April 2010 at 12:08
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Just a thought could this be engine crankcase breathing problem ------------- Gordon |
Posted By: Andrew
Date Posted: 19 April 2010 at 13:36
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Volvo or Yanmar must be able to supply the volume of air displaced at max RPM, if not multiply 3200 rpm by engine size and divide by 2 for a rough estimate. The engine room air intake must be that, plus cooling air flow possibly 30% more. The cooling air is not as important as the water cooling flow, but still necessary and isolated hot spots could occur particularly at the back of the engine. If the raw water output is not pumping around a bucket of water per minuet then it is possible the impeller has a broken blade. This could result in localized over heating and quite possibly oil leaks but more likely blow-by gas is pressurizing the oil at the engine speed you mentioned. Andrew |
Posted By: Don Newport
Date Posted: 20 April 2010 at 00:13
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According to Yanmarhelp.com the 2GM20 requires two ventilation ducts (one inlet, one outlet) each 39 sq cm to provide adequate air supply for the engine. My question really is whether/where such ventilation exists on the 341?
------------- Don Newport ENIGMA, Hanse 341 (2003) berthed Hamble. 3 cabin, wheel steering, 1.75m draft, Yanmar 3YM30, Kiwi prop. |
Posted By: Windsurfer
Date Posted: 07 June 2010 at 08:21
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The same question for the 2008 hanse 320....there's only one duct with a blower which is not working from new...praise the yard!!! but anyways... From my experience working for 5 years as a boat mechanic I haven't seen too many smaller boats with 2 ducts...to be honest this is unnecessary for such small engines - their air consumption is really low...so no worries...the engine will breathe the way it should even if there's no ducts at all...it will simply consume air from the saloon...it will steal your air....so open up at least one hatch or you will eventually suffer from hypoxia....  The blowers are obligatory in gasoline engine compartments and where the engines are big with huge air consumption... As for the oil leakage - it definitely has nothing to do with the ventilation problem... ------------- Hanse 320 #079 White hull, tiller, short keel and rudder, standard North sails, Sparcraft rig |