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Old 10-19-2017, 07:51 PM   #1
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Jabsco Raw Water Pump Improvements

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.
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Old 10-19-2017, 08:01 PM   #2
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Dave, is there any issue with mixing metals?
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Old 10-19-2017, 08:08 PM   #3
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Very nice. Don't know why Jabsco doesn't use Allen screws.
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Old 10-19-2017, 08:20 PM   #4
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Good for you. I replaced mine with hex screws and use a nut driver. Saves a lot of time and frustration.
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Old 10-19-2017, 08:44 PM   #5
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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.
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Old 10-19-2017, 10:30 PM   #6
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Be worth using duralac, tefgel or similar on those dissimilar metal threads IMHO.
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Old 10-20-2017, 07:42 AM   #7
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Greetings,
Mr. HM. Kudos on the removal "tool". I like it!
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Old 10-20-2017, 08:17 AM   #8
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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.
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Old 10-20-2017, 09:24 AM   #9
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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.
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Old 10-20-2017, 09:37 AM   #10
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Also the knurled cap screws make it easy to start and snug by hand.
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Old 10-20-2017, 11:24 AM   #11
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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.
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Old 10-20-2017, 01:23 PM   #12
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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.
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Old 10-20-2017, 02:04 PM   #13
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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...

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Old 10-20-2017, 03:05 PM   #14
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Jabsco 9990-41, sorry it didn't show up very well in the photo.
Thank You.Ouch that's a pricey one.
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Old 10-20-2017, 04:13 PM   #15
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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
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Old 10-21-2017, 03:48 AM   #16
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Speedseal - http://www.speedseal.com/SpeedsealLi...howitworks.htm
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Old 10-21-2017, 03:50 AM   #17
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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.
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Old 10-21-2017, 06:24 AM   #18
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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.
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