new engine in S.O.36.2

[coen]

In my 1997 S.O 36.2 we have the MD2030 engine.
The engine should give enough power, but in our ship it overheats often and seems to give less speed then we expect form it, so I want to replace it for a 40hp engine.
Does anyone have experience with this?

Thanks for all the information, I solved the problem at last, in march 2006 we replaced the engine by a new Volvo D2-40 engine. Now we have 40 hp and no heating problems.

[lars]

My boat (36.2 -97) has an Yanmar 27 hp and its no problem to go 6,5 knots in calm water and a bit lower in opposit wind or waves. This is on 2 400 rpm of 3 400. Never had a overheating! You should check the colingwatersystem, if You got the right rpm on top (maybee the propeller is too big).

From my point of view the only reason to have a bigger engine is better speed in opposite wind and waves.

Best regards
Lars

[MalcolmP]

Hi Coen

Before re-engining I would suggest 2 things:

First check the water intake skin fitting. Typically these are bronze scoops with a grill to stop odd things being sucked into the engine. Jeanneau along with most French yards fit these backwards on sailing boats and forwards (correctly) on motor boats. Their reason is that when sailing if the seacock is left open it is possible for the engine to be flooded due to the water pressure.

Reversing the scoop eliminates the risk of flooded engines, but then many sailing yachts will suffer water starvation which manifests itself firstly with regularly broken impeller blades and engine overheating.

If this is the case turning the skin fitting around will completely solve this, on the condition that you MUST close it when sailing !

If you do have good water flow from the fitting it is possible the heat exchanger needs cleaning, these get a build up of grot on both the seawater side and surprisingly the freshwater side, often because of the use of automotive antifreezes being used that contain silicone products which should NEVER be used. Only glycol without additives should be used in marine engines

Regarding engine power look at a self pitching props such at the Autoprop - you may well be able to deliver a further 10-20% of engine power to the water

The above is based on my knowledge of a Nanni 21Hp on a SO34.2 and an aftermarket fit of a 2 blade Autoprop

Fair winds

Malcolm

s/Y Serendib

[peters]

Coen
Has the engine overheated since new? How many hours are on the engine? If hours high, has the cam plate in the salt water pump been replaced? The cam plate wears thinner as the pump runs. After many hours of use the cam wears so thin that it does not bend the rubber blades enough to pump enough water to cool the engine. Is the water comming out the exaust very hot? If yes check the pumps and other water flow problems. If it is nor very hot check thermostat, heat exchanger, Fresh water hoses and fresh water pump.Have you changed the prop?

Mark

[haffiman37]

Check the folowing: Volvo is famous for "arteritis" in the exhaust bend, take it off and clean the water inn and outlet. Dismantle (for test) the waterstrainer and take water straight from the bottom valve, change impeller to Jabsco 12 wing! If you need more "power", I changed to a 3 blade Flex-O-fold prop and have sailed 20.000N Miles in 14 Months, from Norway to Malaysia! Exelent fuelconsumption (Yanmar 28) end more than enough power.

[coen]

All, thanks for all the information, I replaced my MD 2030 by a D2-40 volvo Penta Engine and there are no overheating problems. I did however discover a manufacturing failure on the engine, the D2-40 engine has a cooling fluid reservoir which is allocated on top of the V belt. The bolt and nut connection is very weak, and after a while the whole construction collapses, the reservoir falls on the V belt and the result speaks for itself.
I also have a leaking waterpump on this new engine and Volvo is a terrible company when it comes to guarantee issues, after almost a year, they still try to avoid repairing this.