Cooling System Volvo Penta

The cooling system of a Volvo Penta marine engine, whether it is a marine diesel or a petrol engine, is one of the most crucial subsystems, which can lead to serious mechanical failures if left neglected. Generally, the engines can be raw-water cooled or fresh-water cooled. A raw water cooling system is a direct cooling system, where the water of the sea/river/lake is pumped into the engine in order to cool it. On the other hand, a freshwater cooling system cools indirectly a cooling fluid or the engine oil, using radiators. 

A raw-water cooling system is much simpler and lower cost to maintain in the short term; however, the more modern engines run better in the long term using more advanced cooling systems. A typical layout of a raw-water cooling system found on an old Volvo Penta marine diesel is made out of the following components: A raw water pump, a thermostat, and an exhaust elbow. Their main disadvantage is the corrosion and scale buildup.

A freshwater cooling system, known also as a closed loop system, is made of the same components as a raw water system, plus a circulation pump and radiators. The radiators are usually counterflow tubular systems; on one circuit, raw water passes, and on the other side, at a counterflow direction, oil or cooling fluid is being cooled through indirect contact. That way, the corrosion is limited within that closed system. If protected anodically, the corrosion is minimized.

Considering the above, in a cooling system, you expect to find raw water pumps and circulation pumps, hoses for the interconnection of them, heat exchangers, thermostats, expansion tanks, and mixing elbows. Poseidon Marine has offered steady raw water pump and circulation pump parts since our foundation. Our principle has always been to offer the highest possible materials in order to ensure your repair lasts over time. For that reason, we supply premium bearing brands, like SKF, INA, KOYO, NACHI, and other members of the World Bearing Association. Our water pump seals are always marine-grade, and our impellers are of the highest quality. Lately, we have developed our own line of water pump shafts, offering you the chance to overhaul your water pumps, using reliable parts, at an affordable price. If Poseidon Marine has to pick a few products for which we can boast about innovation, these would be:

PoseidonMarine® Circulation pump repair kit Volvo Penta AQ165 AQ170 831742 831720

This is a very popular item that has saved at least 200 Volvo Penta AQ165 and AQ170. This repair kit includes a shaft and bearing assembly, a mechanical seal kit, and a circulation pump seal kit.

PoseidonMarine® Circulation pump repair kit for Volvo Penta D4 D6 3582673 3588474

Considering the fact that the Volvo Penta D4 and D6 are already more than 20-year-old engines, by the year 2025, more and more boat owners will be looking for a quality replacement repair kit. Poseidon Marine offers either a seal kit or a complete pump bearing and shaft kit. This repair kit will successfully rebuild pumps: 3803854, 3801650, 22577750. 

Besides these innovative circulation pump repair kits, Poseidon Marine offers the following popular seawater pump repair kits:

• Water pump repair kit for Volvo Penta 860629 3583115 similar to 877373 3841697
• PoseidonMarine® Water pump kit Volvo Penta MD2010 MD2020 MD2030 MD2040 D1-13 D1-20 3593659
• PoseidonMarine® Sea Water Pump Repair kit Volvo Penta D2-55 D2-75 3583089 21951346
• PoseidonMarine® Water pump shaft kit Volvo Penta AQ165 AQ170 MD21 875383 875575
• Crom® Water pump kit Volvo Penta D1A MD1B AQD2B MD2 MD2B MD6A 807368 833415
• Sea Water Pump Shaft Repair Volvo Penta MD2030 MD2040 D1-30 D2-40 Pump 3593655
• Crom® Water pump kit Volvo Penta AQ115 AQ130 MD3B MD17 825916 Jabsco 9900
• Sea water pump repair kit for Volvo Penta D4 pump 3584062 with 3583609 3588475
• SLP® Sea water pump shaft kit for Volvo Penta D6 pump 3589907 21380890
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Poseidon Marine has been offering these parts to every corner of the world. From Auckland, New Zealand, to Togiak and Anchorage in Alaska, we manage to deliver the highest quality water pump parts at the right price. Apart from our own line of kits, we proudly offer Crom Marine and SLP from Sweden, as well as Recmar parts. 

Among the cooling system components, radiators occupy a very significant part of our range. Our main partners for this line of parts are SLP and Crom Marine, both exhibiting supreme Swedish quality. On top of that, SLP offers a 3-year warranty, a very serious element to consider when investing in such parts. Crom Marine offers some retrofit modifications, like the Martec coolers, that would convert your old Volvo Penta MD11 from raw-water cooling to freshwater cooling. SLP offers a great range of heat exchanger units, oil coolers, intercoolers, and rubber parts, like hoses. This premium line of products enriches our inventory with reliable and quality products. 

One of the most basic components of every cooling system is the thermostat. Poseidon Marine offers a wide range of thermostats for various petrol and diesel Volvo Penta engines. These thermostats are made mostly by Recmar and Crom Marine. A good-quality thermostat is not only made to last long but also to operate under the proper operating temperature; opening too early will keep the engine cold, while delaying will make the engine overheat.

Here are some popular thermostats that you will find at Poseidon Marine:

• Recmar® Thermostat kit 60° Volvo Penta AQ115 AQ130 MD2 MD3 MD11 876097 876080
• Crom® Thermostat kit Volvo Penta D31 AD41 KAD42 KAD43 KAD300 3831424 82°C
• Crom® Thermostat kit Volvo Penta fresh water cooled 2002 2003 2003T 875795 71°C
• Crom® Thermostat kit Volvo Penta fresh water cooled MD11 MD17 877349 74°C
• Recmar® thermostat kit 60° Volvo Penta 2001 2002 2003 RO 877355 875779 raw water

Undoubtedly, the impeller is the heart of the cooling system. With very few exceptions, most Volvo Penta engines rely on the impeller. Poseidon Marine keeps in stock a comprehensive range of impellers for all Volvo Penta engines. Our inventory is mostly made of Italian impellers made by CEF, Recmar impellers, and some Poseidon Marine-branded ones. Here are our most popular impellers for Volvo Penta marine:

• Impeller kit for Volvo Penta 18-3077 3841697 21951356 127610-42200 09-1028B
• Water pump impeller for Volvo Penta OMC Cobra 3862281 21213660 21951346 09-1027B
• Impeller kit for Volvo Penta 21951342 3586496 875583 MD5 MD6 MD7 MD11 09-808B
• Impeller for Volvo Penta 3586494 09-806B 09979K 4528-0001 132-0859
• Water pump impeller for Volvo Penta 3593659 22222936 673-0001 09-1026B

Last but not least, in our store, you will find custom-made seal kits, designed to make the maintenance of cooling systems easier. Water pipe seal kits, circulation pump seal kits, and heat exchanger seal kits are some of them. It is the ideal solution in order to make sure you have all the necessary gaskets, seals, O-rings, and other small rubber parts in one comprehensive kit. Here are some  of the most popular seal kits for the cooling system:

• Cooling Pipe gaskets for Volvo Penta 230A 230B AQ131 AQ151 AQ171 Water Pipe 18-3889 22037
• Crom® Cooling pipe gaskets for Volvo Penta 2002 2003 with fresh water cooler
• Crom® Cooling pipe gaskets for Volvo Penta 2001 2002 2003 non-turbo 876224
• Crom® Cooling pipe gaskets Volvo Penta AQ165 AQ170 BB165 BB170 18-0163
• Crom® Cooling pipe gaskets for Volvo Penta MD11 MD17 fresh water cooled