MD21B Fresh water pump

[Ariadne]

Anybody know where I can find a rebuild kit for the fresh water (circulation) pump? I believe the part No. is 875372, but it seems this is no longer available or 90% of the bits to rebuild it!
The pump has just started to leak coolant, so engine running time is very, very short and if it can't be fixed then it seems I will need to replace my engine!!!!!!!!!!

Anybody want to comment on what might happen if went to a totally salt water cooling system on the engine? I really can't afford a new or reconditioned engine in the next 12 months.

Will it work, and how would I best go about it?

Cheers all

 

[scottie]

Do a search answers for this are here from a couple of months ago

There is place in the midlands that will help if you can sort out logistics.


Salt water is a NONO! Too much alloy in heads etc ,

 

[VicS]

The complete pump is available from Keypart ... I'll not tell you the price although its probably less than a new engine!

MarineParts Europe do list some of the pump parts but is not clear from the parts diagrams quite what forms the seal. Listed as part of the impeller I think but NLA

 

[Ariadne]

Cheers for the answers, getting the stuff out to the Caribb' could be a problem.

 

[Ariadne]

Still not sure why you can't run on a full salt water system? Most marine diesels are raw water cooled these days.

In any case should I need to go down this route then it means I can't replace the pump so I'd be replacing the engine in any case. If I got another 3-5 years out of it then it's fine by me as I'll time to save up for a newer one.

 

[scottie]

The salt water will rot the alloy in a short space of time

 

[daveyw]

I'm getting deja vu. Didn't you have this same problem about 4 years ago? Didn't you replace the engine? You didn't put another MD21B in did you?!

 

[Jcorstorphine]

Really stupid idea……….but it might just work.

Get a bog standard 240 volt central heating circulator / pump.

Get a 12 volt to 240 volt inverter suitable for the above pump

Cobble a blank flange with a connection piece to replace the existing water pump

Connect in the central heating circulator

Make sure all 240 volt connections are splash/water proof.

Connect Inverter to output of Alternator

Fill with water and go sailing (well hopefully)

 

[Jcorstorphine]

504 pumps on Ebay

Found this on Ebay

UK

http://www.ebay.ie/sch/i.html?_nkw=...w=MD21B&_osacat=0&_trksid=p3286.c0.m270.l1313

US

http://www.ebay.com/sch/i.html?_trksid=p5197.m570.l1313&_nkw=Peugeot+504+water+pump&_sacat=0

Not sure that the car water pump will fit as had a look at the parts list for the Volvo MD21B circulating pump and it seems a Volvo special as it has fewer tubes and is quite a bit smaller.

 

[Tranona]

Still not sure why you can't run on a full salt water system? Most marine diesels are raw water cooled these days.

Exactly the opposite. Raw water cooled engines are a rarity these days. Think the only one in production is the Yanmar 9hp 1GM. Otherwise engines are fresh water cooled with a heat exchanger. Many reasons - able to run hotter, easier to control temperature, longer life because no salt water in waterways and able to use lighter materials.

 

[EuanMcKenzie]

I think you have teh wrong part number. I have posted against your other thread also. Keypart quote this number as teh fresh water recirculation pump and have one in stock.

Keypart.com

Circulation Pump Assembly

Part Ref: 826870
Ex. VAT: £500.00
Inc. VAT: £600.00

http://www.keypart.com/volvo-penta/diesel-engine/md21b/19791981

its still a lot cheaper than a new engine and the rebuild seems not worthwhile at that price if you then find a part like a shaft is knackered anyway. Better to be sailing.


Sorry - realise someone below has already said so... silly me!

 

[Bilge Rat]

For information DB Marine offer a remanufacturing option, using your pump. This costs £174 plus an optional upgrade to a ceramic seal which is then guaranteed for the life of the pump.

With shipping costs from and to the Caribbean you are probably looking at circa £250 which is considerably cheaper than the Keypart option of £500

Good luck

 

[Ariadne]

Cheers for all the answers, I'm working on it from a few different angles and seem to be moving forward.

Yes, I did have this problem in 2008, and a very kind forum member sold me his spare pump. This pump after spending time in the Med' and up various rivers has done 1,530 hours!!! I think its a bit tired now.

I would not replace this engine with another MD21 as you can't get the bits for them - a nice new Perkins would be far better!