Jabsco Raw Water Pump Improvements

[Salish Nomad]

The photos are of my spare raw water pump. My engine is a Perkins 6-354 Range 4. I have replaced all my slotted brass cover plate screws with SS allen screws, and made an allen driver with the correct length for my pump mounting position. I have also made an impeller removal tool that works well for my pump location.

 

[Max Simmons]

Dave, is there any issue with mixing metals?

 

[HopCar]

Very nice. Don't know why Jabsco doesn't use Allen screws.

 

[LaBomba]

Good for you. I replaced mine with hex screws and use a nut driver. Saves a lot of time and frustration.

 

[Salish Nomad]

Dave, is there any issue with mixing metals?

The original screws were brass, threaded into a bronze pump body, so I think stainless is actually an improvement.
I made a crude video for YouTube titled perkins marine engine raw water pump improvements.

 

[Simi 60]

Be worth using duralac, tefgel or similar on those dissimilar metal threads IMHO.

 

[RT Firefly]

Greetings,
Mr. HM. Kudos on the removal "tool". I like it!

 

[rwidman]

Very nice. Don't know why Jabsco doesn't use Allen screws.

You can always find a flat screwdriver. Not so an Allen wrench.

Slotted screws have not been an issue for me on my pump but I suppose if access was more difficult, Allen screws might make it easier to remove and replace the screws.

 

[CaptTom]

You can always find a flat screwdriver. Not so an Allen wrench.

Slotted screws have not been an issue for me on my pump but I suppose if access was more difficult, Allen screws might make it easier to remove and replace the screws.

Exactly. I also switched to SS Allen bolts. There just wasn't room to get a flat screwdriver in there, never mind a screwdriver and a hand to turn it. An Allen driver on a ratchet works great.

As it turned out, my impeller puller fit, just barely, so no tool mod was required. But I like the idea.

This changes an impeller swap job from a day-long affair involving turning my knuckles into hamburger, into a merely unpleasant job involving an uncomfortable position outboard of one engine.

 

[psneeld]

Also the knurled cap screws make it easy to start and snug by hand.

 

[Pack Mule]

Nice job. I like the removal tool also. Am I reading the Jabsco model number right 9990-1?
I need to get a back up pump for my old Obedorfer pump that's obsolete.

 

[Salish Nomad]

Nice job. I like the removal tool also. Am I reading the Jabsco model number right 9990-1?
I need to get a back up pump for my old Obedorfer pump that's obsolete.

Jabsco 9990-41, sorry it didn't show up very well in the photo.

 

[FlyWright]

Great job! I did the same to my Jabsco pumps years ago and it's been a great improvement. Another trick with the back plates is to reverse a worn one to get more life out of the one you have.

I also had one pump that was difficult to get primed after an impeller change. I called Jabsco and they explained that there is a replaceable wear plate on the back side of the impeller. A very fine pick was needed to grab an edge to remove it. Jabsco sent me a new one gratis and it solved the problem.

Here's my impeller removal tool...

 

[Pack Mule]

Jabsco 9990-41, sorry it didn't show up very well in the photo.

Thank You.Ouch that's a pricey one.

 

[Simi 60]

Thank You.Ouch that's a pricey one.

Wish I could have one as cheap as that, only $500 here.
Try a 7420-1001, here they are more like $1200

 

[DC36Monk]

Speedseal - http://www.speedseal.com/SpeedsealLife/Lifehowitworks.htm

 

[DC36Monk]

And if you bump the starter with the cover off the impeller will start moving out of the case and is then easy to grab.

 

[FF]

The allen head screws can be removed or installed blind.

A huge advantage with some pump locations.

Very little torque is required (the stock slotted screws were brass) to have a watertight seal, so a std allen wrench is all thats needed.

 

[Salish Nomad]

Dave, is there any issue with mixing metals?

Nope, not in my engine room. Everything is nice and dry. The photos are from my 34DeFever with the Perkins 6-354.
My new boat has a Sherwood raw water pump