MD2020 - coolant change and system flush

The coolant must be changed every 2. year and this year it is again time.
I use the original pre-mixed green Volvo Penta coolant used on engines from 1983-2005.
The coolant have some properties as it prevent the engine from boiling at too low temperature, prevent corrosion, preserves rubber gaskets, prevent the engine from frostbite in the winter.
You can also get the coolant as a do it your self mix but I prefer to buy it pre-mixed wich has a price around 33 USD.
The yellow Volvo VCS coolant is for the newer engines from 2006 and forward.
In this video I try to let out all the coolant the right way and also flush the system with fresh water as it must be done according to the manual

[@0zoomtronic0]

Thanks for your time and all the videos.This is very instructive, I will try this next weekend on my MD2020. I hope this channel will never be deleted 😀

[@hometroon7959]

hi Tino your instruction videos are excellent. We have a 2004 B32- i think the same as yours. REALLY PLEASED WITH IT. This weekend i tackle the exhaust elbow, heat exhanger cleaning and coolant replacement. Would not have thought about doing it without your brilliant videos to follow. many thanks. Nick C

[@janethughes515]

Thank you so much for these engine service videos. I am now able to help my visually impaired husband service the same engine - without our usual frustrated antics!!!!

[@BStrapper]

Excellent, the most educational video on inboard (Volvo) engines that i have i have seen I just bought a bav 34, i feel a lot less stupid now and i am about to watch all your videos!!!

[@PittwaterMowing]

Another great video Tino Thanks for sharing all your Bav tips

[@stewartvelzian1639]

Thanks for all of your videos. Every time I need to do something on my boat I search and one of your videos pops up. Before I start a job now I think 'what would Tino do?' 🙂

[@erikvrolijk3614]

Thx Tino, now i can start by my boat neighbour👍

[@johannesprior5936]

Hallo Tino, wie immer super. Danke

[@charlieabbott3968]

Fantastic video, Thank you very much for posting these

[@bradlefton7796]

thank you, very helpful. It's on my to-do list. I have an MD2030 but without a coolant overflow set up. I think I should install something like that. It makes me nervous not to have anything at all for overflow. I don't know why the engine in 1999 was delivered that way.

[@SailingAurora]

Great video, cheers Tiino

[@bruce065]

Thanks a lot Tino!

[@sebastianmommers4669]

Thanks, very helpful!

[@ChaseCapital2826]

Big Thankyou…

[@4MOTION0]

Thanks 👌🏻

[@TheMagicalArmchair]

Thanks Tino - about to do my Coolant change on my D2-55 (very similar) so this is very helpful. On the drain plug did you grease it with copper slip?

[@twiper]

No I used PTFE grease which means teflon grease

[@albertodepaulaprieto866]

Hi Tino, what size is the square key to open the refrigeration circuit?

[@christophelecaz2143]

Hello Tino! Thanks a lot for your video. Where is the calorstat on the md2020? Is it necessary to change it?

[@alexnordavind5778]

Hi Tino, Thank you! Your videos are really informative. I have a Bavaria with a similar D1-20 engine. I was wondering, how do you change the coolant in the hoses to the water heater? Should I disconnect the hoses at the water heater (which are lower) also?. Or is the remaining amount of old coolant in these hoses so little that i can skip the hassle

[@twiper]

Normal I don't think it is necessary to flush out the water heater hoses, only if the coolant system is very dirty. If your engine gets it's very first coolant change it could maybe be an idea to flush out the water heater hoses to be sure everything is totally clean.

[@brrehalkjelsvik5396]

Is the dimension of the drainplug 3/4’’BSPT?

[@brrehalkjelsvik5396]

Genialt👍

[@bendix998]

This is another great and instructive video - thank’s a lot. Please keep them coming! A question about the socket for the drain plug. I haven’t been able to find a shop that can provide such. And Bato only sells B2B. They suggested Carl F - but I could not find it on their web page. Have you any suggestion where to purchase it?

[@twiper]

Don't know where in the world you are from but the socket is known as a transmission oil plug socket. You can also get it at Biltema in the North countries. www.biltema.dk/varktoj/handvarktoj/trakvarktoj/toppe/top-38-til-10-mm-hesteskobrod-2000016836

[@twiper]

Seems like you can find one on eBay 😊 www.ebay.com/itm/2048-10MM-FEMALE-SQUARE-HEAD-DRAIN-PLUG-SOCKET/202002242862?epid=661635964&hash=item2f08459d2e:g:ygcAAMXQIfJRGKPl

[@bendix998]

Tino, you are my hero! I have trawled the Biltema website WO any success, also I asked in the store in Glostrup - also WO success. I didn’thave any success at the Carf F website either. In the end, I decided to brother you - and thank you for your help! :-) I have a Dofour 33 GibSea with a MD2020. I seems that I have even lesser space around my engine, so I am not able to access the drain plug without my socket wernch with the long extender. Thank you again. I will look forward for you next video!

[@steph-RZ]

Hello Tino, Thank you for all your video, very helpful . Where did you find the socket to unscrew the bolt of the coolant ? Impossible to find it. Thank you very much. Stéphane.

[@twiper]

Try to search for "Drain Plug Socket Set" the one I use in the video is a 3/8" with a 10mm. square hole. If you are from Europe you can find the socket at Biltema.se and it is called "hästskobrodd".

[@steph-RZ]

@@twiper thank you I’m in south France I will have a look at biltema.

[@richardgreenwood7075]

Tino - thanks, as always a really useful video. I'm having real problems getting the plug out on my engine having rounded off the corners of the square head, I've got some Irwin grip nut remover sockets which I think will work. Can I just check that the drain plug is solid not hollow on the inside and it's made from steel not brass ? I don't want to risk breaking it and ending up with a real problem. You've got a little bit more room on your Bavaria than I have on my Jeanneau.

[@twiper]

The drain plug is solid iron

[@richardgreenwood7075]

@@twiper Thanks Tino

[@twiper]

If your drain plug has a damaged top you need a new one. A common thing people do is to turn the wrong way to unscrew, be sure you turn the plug the right way when unscrewing. If it is very stuck you can get a special tool to heat up the plug, it is in a way a big soldering iron made to loosen up bolts. The plug is tight but not crazy tight. If the plug top is totally damaged it is possible to weld on something so you can turn the plug.

[@richardgreenwood7075]

@@twiper Thanks Tino - welding on a nut is probably the next step ! My plan is to fit the VP faucet (one of your other posters very helpfully listed the part number) so I don't have this nightmare again.

[@drdistorzion]

On my MD2020 there is no plastic container on the wall for the coolant, and I see on many pictures of MD2020 that they only have a cap on the top of the heat exchanger. Is the reservoir you have there up on the wall an optional upgrade or do you think it was added to that version? mine is a 2001 model and I assume yours is a couple of years newer.

[@twiper]

The reservoir is a expansion tank to ensure the coolant system doesn't crack due to over pressure, it also prevent air in the system. On your system you have a radiator cap and a hose in the side where coolant will expand through and run out into eg. a bottle. When the engine gets' cold the hose will then suck up the coolant there has been filled into the bottle when it was hot. To prevent the overflow I think it is possible just not to fill the coolant system to the brim so the coolant can expand and retract without running out.

[@twiper]

blog.championcooling.com/2018/06/08/overflow-tank-vs-expansion-tank/

[@drdistorzion]

@@twiper yes there is a hose on the side of the cap. But I really like your setup where it's so easy to check the level of the coolant, so I might install such an expansion container on mine as well.

[@richarddaddario793]

Great Video, I have a MD230 on a 2004 Bavaria 36 with same setup. I am having a hard time removing the coolant cap on the heat exchanger, I can twist and turn the cap to loosen it, but when I lift it only goes up a little feels like it gets stuck.. I don't want pull too hard any thoughts?

[@twiper]

Think you must press it down and turn it a bit more before you pull it up.

[@martyntozer6789]

Gino I have had my heat exchanger out and am not sure which way in it should go as one end is different,can you advise,regards martyn

[@twiper]

If you own a MD2020 each end should be the same. Some exchanger elements is covered with a sleeve and there should be stamped "UP" on one of the sides if the unit must be mounted in a certain way.

[@joimagg]

Thanks a thousand. But you jumped over the part I was most curious about. On my Bavaria 32 2004 model there is no room over the reservoir to pour coolant. How did you do that?

[@twiper]

I used a small can and filled the can half so it was possible to fill the reservoir with that.

[@joimagg]

@@twiper Thanks. I ended up using the little manual pump I use to suck from under the engine. Worked like a charm. Tak for dine videos, som jeg skrev har jeg samme båd og er helt fersk. Tror ikke det finnes så mange gode to clips på nettet for andre båder så rimelig tilfreds med det jeg er endte med. Skal du op en størrelse i nærmeste fremtid?

[@twiper]

@@joimagg Super :) - I actually maybe have a buyer for my boat, so a bigger boat is soon in the harbor.

[@jonahwhale9047]

Great looking boat. I don't know the model but I looks really seaworthy. What are the threads on the drain plug? There must be a better option than having it just pour over your engine & into your bilge, e.g. a tap or 'drain off valve' that could be used with a hose to a waste bottle. Also called a "drain off cock valve".

[@laurencetubbs4052]

11/16 8 point socket will fit the drain plug in standard size ;)

[@twiper]

I have tried other types of sockets and they all slip. The problem is the plug is very tight and the horse shoe mount is the way to go. The plug type is also known as a gearbox drain plug. If you use the wrong socket you will destroy the plug top and round off the corners so it will be near impossible to remove.

[@laurencetubbs4052]

@@twiper An 8 point socket is for removing square drive plugs, I have an md2030 and that size works on the plug.

[@christianm2236]

@@twiper do you have the exact specifications/details for the socket you used?

[@enriquelorenzo5476]

Hi Tino, why don't you clean the coolant expansion tank?

[@twiper]

There is always some dirt in the system so no need for cleaning the expantion tank. If it is very dirty it is possible to remove it and clean it propperly.

[@juliogaitan3146]

What thread is the coolant screw, is it metric 14?

[@twiper]

I don't know if it is metric, but I know the coolant screw is conical so it by design make a seal when it is mounted.

[@juliogaitan3146]

@@twiper thank you, I would like to install a valve to facilitate the change of refrigerant

[@kduborg]

Syntes der er blevet længere mellem dine videoer. 😟. Det er synd! Jeg ser frem til dem hver uge!

[@twiper]

Jeg har fået job så tiden er lidt begrænset, dog er der en ny video klar lørdag kl. 20 hvor jeg atter har fået båden på land :) - med job er planen hovedsageligt at købe ny båd, men der er mange spekulationer da det gerne skulle være det rigtige valg økonomisk og noget der passer til mine fremtidige planer.

[@kduborg]

@@twiper Det kunne være spændende at høre mere om fremtidsplanerne! Ser frem til lørdagsvideo. 👍

[@martyntozer6789]

Also can’t get water to flow properly

[@twiper]

A low waterflow is often due to a blocked saildrive water inlet or a blocked exhaust elbow