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Old 12-29-2018, 03:30 PM   #1
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Johnson Raw Water Pump Cover Screws

Okay, I give up. Searched this forum and Googled far and wide but could not find the size of the cover screws. I want to replace the slotted brass screws with allen head cap screws or thumb screws, anything other than slotted head screws. This would be for the pump on a Lehman 120.
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Old 12-29-2018, 03:53 PM   #2
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I would pull a screw and take it a hardware store and match the thred. Most hardware stores have a gauge.
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Old 12-29-2018, 03:54 PM   #3
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Like this.....?
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Old 12-30-2018, 04:17 AM   #4
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I replaced mine with cap screws from Ace Hardware. I purchased spares in case I dropped one I wouldnt have to fish around to get back up and running.
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Old 01-03-2019, 12:05 PM   #5
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Originally Posted by catalinajack View Post
Okay, I give up. Searched this forum and Googled far and wide but could not find the size of the cover screws. I want to replace the slotted brass screws with allen head cap screws or thumb screws, anything other than slotted head screws. This would be for the pump on a Lehman 120.
What did you end up with? The size in the picture above are M5. The screws in my Johnson pump are M4 from my measurement.
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Old 01-03-2019, 12:14 PM   #6
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Aren't the screws socket fit as well as screw head? I've never had a problem removing them with a little socket wrench. Plus the new impellers come with gasket or O ring and spare screws.
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Old 01-03-2019, 12:19 PM   #7
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I took one of mine to Ace Hardware and bought a set of knurled head phillips head screws for my Jabsco RW pump and my Jabsco head. Both are now a piece of cake to service.

EDIT: I meant to say Allen wrench head, not phillips. The pic is right.

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Old 01-03-2019, 01:15 PM   #8
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I took one of mine to Ace Hardware and bought a set of knurled head phillips head screws for my Jabsco RW pump and my Jabsco head. Both are now a piece of cake to service.

Looks like Ace is the place although I think the Johnsons will be metric. So we shall see
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Old 01-03-2019, 01:18 PM   #9
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Aren't the screws socket fit as well as screw head? I've never had a problem removing them with a little socket wrench. Plus the new impellers come with gasket or O ring and spare screws.
Round with regular screwdriver.

I just bought an impeller and it did came with gaskets and o ring. Is it both or either / or?
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Old 01-03-2019, 04:19 PM   #10
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The hardware store said that they were 8 x32. Only available in stainless with a hex head. See what happens when I get to the boat. Being a European pump you would think metric...but.
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Old 01-03-2019, 06:05 PM   #11
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Being the pump was made for an English engine, they might have spec'd SAE fasteners.

Take an 8-32 nut out of the hdw store bin and fit it on your screw. And you can absolutely get 8-32 in socket head capscrew SS.
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Old 01-03-2019, 06:13 PM   #12
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Being the pump was made for an English engine, they might have spec'd SAE fasteners.

Take an 8-32 nut out of the hdw store bin and fit it on your screw. And you can absolutely get 8-32 in socket head capscrew SS.
Exactly what I did. I got stainless hex head which is what I wanted. Surprised that they were SAE.
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Old 01-03-2019, 06:16 PM   #13
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I forgot to mention they were SS. Right next to bronze on the metals chart so corrosion shouldn't be a problem should they get wet.
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Old 01-03-2019, 07:59 PM   #14
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Screws are cheap.
Buy 6 of each of 8/32, 4m, 5m, 6m and any other size they might possibly be. SS cap screws if you can, or hex. toss the slot heads even if they come off OK. Keep the wrong size spares, they will eventually come in handy.
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Old 01-04-2019, 06:53 AM   #15
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What did you end up with? The size in the picture above are M5. The screws in my Johnson pump are M4 from my measurement.
Yeah, I saw that also and bought the metric size at a hardware having forgot to take along a sample. Wrong. They are 8-32's with a half-inch reach. I bought 14 socket-head cap screws. No more fumbling with those oft-disappearing slotted screws.
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Old 01-04-2019, 11:17 AM   #16
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The hardware store said that they were 8 x32. Only available in stainless with a hex head. See what happens when I get to the boat. Being a European pump you would think metric...but.

Try Mcmaster.com
I got some nice shouldered, knurled stainless ones for my pump. I can change an impellor in 5 minutes now..
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Old 01-04-2019, 01:26 PM   #17
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Finally found the pic of my rebuilt pump with the new hex screws...

Jabsco Raw Water Pump Improvements
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Old 01-11-2019, 02:17 PM   #18
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I checked with the manufacturer first to see if I could use stainless screws and they said no problem. Then I took the brass screws to a local stainless screw provider and used those. Much better. No problems after two years. You can also chose the type of head you want.
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Old 01-11-2019, 07:51 PM   #19
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It is a real shame that Speedseal stopped supplying their product - it was a genuine superior solution to this problem, as well as improved impeller life.
I believe you can get this size of machine screw with a large knurled head, in bronze, but I can't remember the supplier.
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Old 01-11-2019, 08:51 PM   #20
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Finally found the pic of my rebuilt pump with the new hex screws...

Jabsco Raw Water Pump Improvements
Very nice, Al (even if it is the wrong color paint).
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