Obsolete Jabsco water pump

[Bodach na mara]

The seawater pump on the engine is a Jabsco model 9900 pump, which is desvribed as obsolete on their web site. Unfortunately mine has problems with the seals and shaft (which I suspect is corroded at the point where it passes through the seal.) The replacement is a model 29470-2231C but the mounting flange has no holes in it to accept the studs on the engine block, also the flange does not seem to be wide enough to accept holes being drilled in it. Has anyone replaced a 9900 with the new model?

 

[pvb]

Spares seem to be available; why not repair it?

 

[Bodach na mara]

I did consider repairing it but I have done it before and found that the spares are costly. At the time (about 10 years ago) the shaft alone was about 1/3 of the price of a new pump and Jabsco have none in stock now.

The 9900 model has an impeller that is hard to fit. To do so you need to remove the pump from the engine and then draw the shaft as the impeller is held by a screw right through the shaft. Replacing the shaft usually damages the water seal and remounting the pump is a real pain. The new version has a slot in the shaft so that the impeller can be pulled out from the front.

 

[duncanmack]

Hi Ken, am I correct in thinking there is only one bolt holding the pump on? (Google images would suggest that)
If so, phone Mack Engineering in Hillington (who appear to be the least expensive supplier) and see if they have a 29470-2231C in stock. If they do then go compare. You may very well find that the hold-on bolt hole is well outside the flange on the new pump - if it is then it's a simple matter to secure the pump using a longer bolt and a "bridge". Used to be SOP on distributors and injectors. On the other hand......

 

[Bodach na mara]

Thanks Duncan, but the existing pump has two studs through the flange, one above the shaft and one below, which gets dripped on and rusts. The flange is sort of oval, to allow space for the holes for the studs. The replacement pump has a round flange in the illustrations.

I was in Hillington today and looked for Mack, but I had neglected to make a note of their address. I did find GaelForce however so it was not a wasted journey!

 

[pvb]

... the existing pump has two studs through the flange, one above the shaft and one below, which gets dripped on and rusts. The flange is sort of oval, to allow space for the holes for the studs. The replacement pump has a round flange in the illustrations.

The replacement pump is a Johnson 10-35098-2, which presumably is the same as the Jabsco 29470-2231C you mentioned. To fit the replacement, you need 2 little clamps, Johnson part number 01-43238, which fit on the studs and hold the pump in place. They look like this...

They're out of stock at ASAP Supplies, but available elsewhere. Here's just one supplier - http://www.pumpvendor.com/Johnson_01-43238.html

 

[Bodach na mara]

Thanks Duncan and pvb. Those clamps look like the way forward IF I get a new pump. Maybe Mack Engineering will know of a source, or I can probably make two from odd bits of metal.

I am reconsidering repairing the old one, if the shaft is not pitted in the area where the seals press against it.

 

[pvb]

I am reconsidering repairing the old one, if the shaft is not pitted in the area where the seals press against it.

New shafts are available.

 

[DaiB]

"SPEEDI-SLEEVE

SKF SPEEDI-SLEEVES offer a cost-effective sealing solution when machine shaft surfaces have been damaged or worn in operation. SKF SPEEDI-SLEEVES eliminate the typical need to replace or rework damaged shafts caused by abrasion due to environmental contaminants, high pressures, speeds or inadequate lubrication.

Shafts can be up and running within minutes, at a fraction of the cost of traditional reworking. The standard SPEEDI-SLEEVES size range covers shaft diameters from 11.91 to 203.33mm (0.472 to 8 in)
Each SPEEDI-SLEEVE, metric or imperial, is designed to fit a specific shaft range, usually above and below the nominal shaft diameter. This permits some flexibility to accommodate variations in the actual shaft size
SPEEDI-SLEEVES are made of stainless steel and their extremely thin walls (0.28mm/.011 in.) allow users to retain the original seal size. All SPEEDI-SLEEVES feature a removable installation flange for easy mounting using a tool supplied with each sleeve
The flange can be retained or removed (if necessary) for clearance purposes - a pre-cut tear-groove is provided""


I have used these before and will work in some cases, depends how the pump is built up.

 

[Bodach na mara]

Thanks Dai, I remember reading about these in PBO in connection with repair of a gearbox or something.

 

[scottie]

Get a new shaft made to sample but replace simple hole with a slot or even ask mack if there is an alternative shaft