MD2020 saltwater pump

Thanks Richard,

If I find it a positive solution I'll report back. If I don't find it a positive solution - that might be just me, no reflection on advise given :)

Jonathan
 
They are elastomeric lip seals, although some manufacturers use slightly different nomenclature, e.g. SKF call them radial shaft seals, which seems to me to cover various other options. Wiki calls them radial shaft seals also. James Walker, a company I knew very well, calls them lip seals https://www.jameswalker.biz/en/product_ranges/69-metal-cased-lip-seals

Mechanical seals are the type used in PSS shaft seals, where a carbon or similar disc runs against a counterface, sealing on the radial face. Most refineries will have thousands of them, almost every pump and these days many centrifugal compressors are also fitted with them. Some run at hundreds of bar pressure, which makes a PSS look like it is having an easy time!
 
Just about to do this job on a Johnston pump on a Nanni engine. New shaft is £87 and I got SKF bearings and seals with stainless garter springs for £10.57 from Simply Bearings online. 2 bearings and 2 seals - very good service and I'll get them by the weekend. The groove is where the water seal goes, the oil lubricated one ok so may try the suggested method of moving the water seal so sits on a different part of the shaft, which will save the cost of the new shaft.
Incidently I found a short length of 15mm copper pipe is just the correct internal diameter to slip over the shaft and drive off the old bearings.
 
vyv_cox said:
The cause of permanent leaks, even with a new seal, is that a groove has been worn in the shaft, increasing the clearance between it and the seal lip. A way of improving the situation is simply to not press the seal fully home, allowing the lips to sit on a new part of the shaft. A simple shim made up of thin plastic or even cardboard, placed into the housing before the seal is pressed home, will hold the seal in the new position.
Click to expand...

Don;t forget you can get double lip seals. In the standard sizes.

e.g.
http://simplybearings.co.uk/shop/Seals-Viton+Rubber/c19_4462/p70211/10x30x7mm+TC+/+R23+Double+Lip+Viton+Rubber+Metric+Rotary+Shaft+Oil+Seal+with+Garter+Spring/product_info.html
 
I had a reply from the local Jabsco office here in Sydney. They offer a new shaft at A$220 (the exchange rate is about 2:1). If I buy I'll be buying from the UK - postage for that sort of weight is about stg20 and takes 7-10 days.

Edit The fact that Jabsco stock suggests they are s standard item and might be available from other jabsco outlets, something else to look at. close Edit.

The downside of living at the other end of the world, minimal competition and long distances.

I'll be searching for seals today, once I have defined what the new one is that is on the boat.

Jonathan

edit The Jabsco pump number appears to be:

29350-1101

and it has a service kit, content not defined:

SK23 - 0101

close edit
 
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I think its the same pump as on the 2010 B, C and D and on the 2020 C and D, maybe B. I have a rather scruffy exploded parts drawing that implies its the same as also on the 2030C/D and 2040C/D, but this latter might not be correct.

The seal has GACO DPSM 12247 embossed in it and the number 19. The Volvo part number is 833996. GACO is/was George Angus and Co now Orinoco and can be found at:

gacoseals.co.uk

My original Volvo box says 'made In Sweden' - which does not seem quite right given its made by GACO.

If you google GACO DPSM 12247 you will find a number of forum threads on the topic. One of which suggests the size is:

12mm:24mm:7mm

I have an enquiry at GACO for price on the original part and on parts 8mm and 9mm (instead of 7mm).

Jonathan

edit: confusingly it is suggested that Volvo fitted Jabsco pumps to some MD2010 and 2020 but Johnson pumps to others. Apparently the pumps are replaceable with each other - but not the parts. close edit
 
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Ok So how do I start

Pictures show the water pump as I took it off, in one pic you will see the impellor blade that must have been stuck in the outlet spigot for several years. I no longer turn off and forget to turn on the seacock.
With the pump are the contents of the Volvo kit I bought, only one seal, is that right
Anyway, so how do I start the disassembly? I would welcome knowledge from those who know before I attack and do damage.
 

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Re: Ok So how do I start

johnphilip said:
Pictures show the water pump as I took it off, in one pic you will see the impellor blade that must have been stuck in the outlet spigot for several years. I no longer turn off and forget to turn on the seacock.
With the pump are the contents of the Volvo kit I bought, only one seal, is that right
Anyway, so how do I start the disassembly? I would welcome knowledge from those who know before I attack and do damage.
Click to expand...

does this help?
http://www.marinepartseurope.com/uk/en/volvo-penta-explodedview-7740690-26-4153.aspx

If you bought your shaft kit from Keyparts it probably only has one seal in it.

It looks like the second seal you need is sold in their wear kit

http://www.keypart.com/stock/21951370

Unlike the marine parts Europe site!

You need two seals give Keyparts a call and they will probably put one in the post to you if you are nice to them!

You need to undo the nut on the inboard end of the pump and remove the gear wheel possibly with a borrowed mechanics three legged puller off the end of the shaft. (try a local garage?)Then remove the circlip and dismantle take note of the position and orientation of the various components and replace as you find them but incorporating the new seals and bearings.

Let us know how you get on....
 
Re: Ok So how do I start

While so many of you knowledgeable types are looking at this thread......

I have just taken my 2030 pump off today. There seems to be a slight weep of seawater coming from the holes between the impeller housing and engine. I have dug out the lipseal behind the impellor and will replace.

My impeller shaft size is 1/2in not the usual 12.5mm. If you look at the johnphillip photos, his new shaft slight necks down from the part that the impeller goes on - mine is the same. Is this the 0.2mm difference between 1/2 in and 12.5mm? Or does it mean I need a different seal size? I don't want to have to disassemble further to measure the shaft size at the seal.

a P. S.

I have just looked again at the seal I have just dug out. It had the spring outermost ie the side facing the impeller. Is that right - I would have guessed it should be on the other side - away from the water.
 
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Re: Ok So how do I start

johnphilip said:
Pictures show the water pump as I took it off, in one pic you will see the impellor blade that must have been stuck in the outlet spigot for several years. I no longer turn off and forget to turn on the seacock.
With the pump are the contents of the Volvo kit I bought, only one seal, is that right
Anyway, so how do I start the disassembly? I would welcome knowledge from those who know before I attack and do damage.
Click to expand...

I am sure you should hav e two seals. There are two in there, one to keep the oil in the crankcase and one to keep the water in the pump with a spacer between them

Check before you start ! No sense in rebuilding with an old seal! Note which way they are both fitted ( back to back with lips facing oil and water respectively)

remove cover and impeller
remove retaining nut and pull off gear ( Its on a taper ITYWF )

Remove large circlip

Knock /drift apart noting position and orientation of all parts.

Rebuild with new parts.

Parts diags pretty much explain ( sod all in the workshop manual) how its all put together.


26751.jpg
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26644.jpg
 
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Re: Ok So how do I start

I did not have a gear puller, I do now, I laid the shaft between 2 pieces of wood, face plates on a vice, and tapped the shaft gently with a wooden mallet (having taken off the securement nut). The shaft slipped out easily. You need to get ready to catch the shaft, it disassembles much more easily and quickly than I had thought!

Its a very simple piece of servicing, just follow the instructions given above and the exploded diagram. Its also quite satisfying when its all back together and not leaking.

Jonathan
 
Re: Ok So how do I start

I have just looked at the exploded diagram I have of the water pump, dated 21 Nov 2005, and its the same as the one above - except.

My diagram has both water and oil seal with the same part number (#3) but the Volvo diagram above has them numbered as Parts 10 and 15. Both my diagram and the one above show the seals the same way round, spring (or lips) toward the water and spring toward the outside (not toward the oil). Or, both diagrams are the same with the lip of one seal toward the water and the flat of the seal toward the oil.

I also note that though we are cajoled into double clipping water hoses (ISAF rules) Volvo do not bother :(
 
Re: Ok So how do I start

Jonathan is right.

Vic's diagram in post #31 does seem to show oil seal 15 with the spring facing away from the oil. I noticed it last night but thought I must be mistaken as that seems wrong to me. However, after Jonathan's post I'm thinking that my eyesight is not that bad after all.

Can anyone clarify whether or not the factory assembles the seal in the order shown in post #31?

Richard
 
Re: Ok So how do I start

Neeves said:
I have just looked at the exploded diagram I have of the water pump, dated 21 Nov 2005, and its the same as the one above - except.

My diagram has both water and oil seal with the same part number (#3) but the Volvo diagram above has them numbered as Parts 10 and 15. Both my diagram and the one above show the seals the same way round, spring (or lips) toward the water and spring toward the outside (not toward the oil). Or, both diagrams are the same with the lip of one seal toward the water and the flat of the seal toward the oil.

I also note that though we are cajoled into double clipping water hoses (ISAF rules) Volvo do not bother :(
Click to expand...

RichardS said:
Jonathan is right.

Vic's diagram in post #31 does seem to show oil seal 15 with the spring facing away from the oil. I noticed it last night but thought I must be mistaken as that seems wrong to me. However, after Jonathan's post I'm thinking that my eyesight is not that bad after all.

Can anyone clarify whether or not the factory assembles the seal in the order shown in post #31?

Richard
Click to expand...

The two seals may have different identifying numbers on the diagrams but if you look at the parts catalog you will find that they are infact both the same part number : 833996

Regarding the correct "way round" here is a diagram of a similar pump from a VP 'shop manual that shows without question which wy round they go

VP%20seawater%20pump.jpg
 
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Re: Ok So how do I start

TSB240 said:
does this help?
http://www.marinepartseurope.com/uk/en/volvo-penta-explodedview-7740690-26-4153.aspx

If you bought your shaft kit from Keyparts it probably only has one seal in it.

It looks like the second seal you need is sold in their wear kit

http://www.keypart.com/stock/21951370

Unlike the marine parts Europe site!

You need two seals give Keyparts a call and they will probably put one in the post to you if you are nice to them!



Let us know how you get on....
Click to expand...
The situation on Marine Parts Europe site is the same as Keyparts. You cannot buy a new shaft except as part of kit21951416 as this is a Volvo kit from either supplier it comes without the second seal, although I can buy the additional seal separately, I don't have to buy the second "Wear parts" kit in full. Keyparts are selling me one.
Who else but Vulva would make up a shaft kit without one of the two seals?
 
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