Ball Bearing size Penta 3593655 seawater pump

[Username25]

What is Penta 3593655 seawater pump ball bearing 181717 size?

Lip seal 833996 size is 12x24x7mm. Are these SKF seals good for replacement? Should I get Viton or Nitrile Rubber?

https://www.ebay.co.uk/itm/12x24x7mm...-/162932233113
https://www.ebay.co.uk/itm/401503030...496&rmvSB=true

On a side note, is it common to carry back-up and ready to swap pump? This post makes me think again...

My nearly new Volvo Penta D1-30F engine waterpump (only 50 hours running), failed at sea last week due to the cam breaking free and revolving. The tiny locator screw (?copper colored at the break) appears to ha ve sheared with the broken ends looking very "pink". Any ideas what has gone wrong?Is there anything I could have done to prevent this? Could I have done a repair at sea? (I had to be rescued by the coast guard) I am very surprised that my life could depend on such a small copper alloy screw.

[Lepke]

A bearing supply can measure and match your bearing. Your cam screw failed because of electrolysis. Is there a zinc in the pump plumbing and is it bonded to the pump, either by metal plumbing or a bonding wire?
The screw was probably a different alloy (least noble metal) in the pump. The shaft is usually stainless, the housing and cam bronze, and the screw could have been brass. 50 hours is fast, so the screw was very different alloy. A zinc anode in the pump plumbing will stop the problem. If the pump is bonded to the thru hull and the thru hull protected by a zinc, then you don't need an inline anode and you just had a cheap screw.

[Wotname]

Originally Posted by Username25

What is Penta 3593655 seawater pump ball bearing 181717 size?

Lip seal 833996 size is 12x24x7mm. Are these SKF seals good for replacement? Should I get Viton or Nitrile Rubber?

https://www.ebay.co.uk/itm/12x24x7mm...-/162932233113
https://www.ebay.co.uk/itm/401503030...496&rmvSB=true

.......

Both Vitron and Nitrile rubber are suitable but in this instance, the Vitron has a stainless steel garter spring which is essential for use in a sea water application. The other one doesn't mention what the garter spring is so one should assume it is carbon steel (which is normal for oil seals).

However a carbon steel garter spring can be removed and replaced with a suitably sized O ring. This is common modification for using an oil seal for sea water.

[Username25]

Originally Posted by Lepke

A bearing supply can measure and match your bearing. Your cam screw failed because of electrolysis. Is there a zinc in the pump plumbing and is it bonded to the pump, either by metal plumbing or a bonding wire?
The screw was probably a different alloy (least noble metal) in the pump. The shaft is usually stainless, the housing and cam bronze, and the screw could have been brass. 50 hours is fast, so the screw was very different alloy. A zinc anode in the pump plumbing will stop the problem. If the pump is bonded to the thru hull and the thru hull protected by a zinc, then you don't need an inline anode and you just had a cheap screw.

This was not my case. My pump is fine, so I can't measure bearing size. I'm ordering seals from online bearing shop and would like to get spare bearings in case need to re-build in a future.

[Username25]

Originally Posted by Wotname

Both Vitron and Nitrile rubber are suitable but in this instance, the Vitron has a stainless steel garter spring which is essential for use in a sea water application. The other one doesn't mention what the garter spring is so one should assume it is carbon steel (which is normal for oil seals).

However a carbon steel garter spring can be removed and replaced with a suitably sized O ring. This is common modification for using an oil seal for sea water.

Thanks. O-rings should be something like 1.5mm cross section x 12mm inside diameter?

https://www.lancashireseals.co.uk/o-...o-rings-1.html

[nigel1]

Have a look at the Jabsco shop, the price of bearings and seals for raw water pumps are usually less than those quoted by bearing suppliers.


https://www.jabscoshop.com/jabscosho...-10-flange.htm

[Wotname]

You can measure usually the ID and OD of the bearing without pulling the pump completely apart. The height will be a common size for the ID and OD numbers.

[Username25]

Originally Posted by nigel1

Have a look at the Jabsco shop, the price of bearings and seals for raw water pumps are usually less than those quoted by bearing suppliers.

https://www.jabscoshop.com/jabscosho...-10-flange.htm

Less? Not in my universe

Bearing Jabsco Shop £8.10 (incl. VAT) vs bearing supplier £3.31/£4.30 (not claiming size 12x32x10mm is a good one)

6201 SKF Deep Groove Ball Bearing 12x32x10 - WychBearings.co.uk
6201-2RSH SKF Deep Groove Ball Bearing 12x32x10 - WychBearings.co.uk

Seal Jabsco Shop £15.68 (incl. VAT) vs bearing supplier £5.00

https://www.lancashireseals.co.uk/12...el-spring.html

[jimbunyard]

According to your p/n, 3593655, and this webpage, your pump is a Johnson 10-24752-01.

Volvo Penta Replacement Seawater Pump, JMP # JPR-VP0010DB - 3593655 - JMP Marine USA

Bearing is 6001 ST, 12 x 28 x 8
Seal is, as you state, 12 x 24 x 7

If you have confirmed that your 3593655 pump is indeed the Johnson 10-24752-10, then you can be fairly confident that the numbers and dimensions are correct. To be absolutely sure you must verify physically; there is no guarantee that there are not undocumented intramodel changes unspecified in catalogs, especially with manufacturer-outsourced 'auxillary' parts.

For instance, I have 2 MD2020's (not sure about the possible letter designation differences between the two) but they have r/w pumps from different manufacturers on them, and none of the parts are interchangeable...

Regarding the bronze screw, replace them all with stainless and neversieze them. That's what I do anyway.

The flange in the pump shown below does not agree with what I'm familiar with for the MD 20 (Perkins 100) series, which is rectangular and offset...however, that doesn't mean that the rest of the pump (i.e. bearings, seals, impeller, etc. isn't the same).

[Username25]

Thanks. I will check my pump physically.

One more question should I go with sealed or opened bearings?

6001-2RSH SKF Deep Groove Ball Bearing 12x28x8 - WychBearings.co.uk
6001 SKF Deep Groove Ball Bearing 12x28x8 - WychBearings.co.uk

[jimbunyard]

If you have the rectangular, offset flange, the bearings are lubricated by engine oil from inside the front gear cover. Sealed probably won't hurt anything, but ideally I'd use a 6001 (unsealed/unshielded) on the inner position and a 6001Z (single seal) on the outer position, with the sealed side facing the lip oil seal.

It's easiest just to get two unsealed bearings, though it's simple enough to just pry the bearing's seals out if need be...

[Username25]

Great! Thank you very much.

[thunderhoof]

I have a bearing Source to suggest:
Boca Bearings, Boynton Beach Florida.
I have used them several times and they seem to have a very comprehensive inventory, including ceramic ball bearings for corrosive applications.