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Old 09-19-2017, 08:13 AM   #1
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FL 120 raw water pump replacement - need advice

I recently bought the Johnson pump to replace the original Jabsco on my FL 120. The Jabsco was leaking at the beginning of the season and although I managed to replace the seals (and it's been running fine since then), I figured I would replace the pump as soon as I got the time to avoid the predictable failure of the Jabsco pump somewhere down the line.

So now I have a few questions before I tackle the job!

First, which is the in and the out port? It says on the pump that it depends of the rotation of the gear it connects to. How do I find that out? I'm assuming I have to install the pump with the ports pointing up and down since the engine block would be in the way of one of the ports if they were horizontal? There is also some king of notch on the flange (on the left side of my picture). Does this need to go at a specific location on the engine flange?

Second question. It says I need to block an oil passage with a supplied plug. I'm assuming the old pump need to be lubricated by the engine oil and the new one does not. Do I need to put grease on the gear then before installing the new one?

Finally, the pump came with two paper gaskets. Do I need to install both of them? Or is the second one a spare?

Oh, one more question. Does this pump use the same impeller as the Jabsco pump? I have a few spares but if they don't fit I will get new ones.

Thanks!
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Old 09-19-2017, 09:08 AM   #2
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I'm not sure about the oil passage issue because my mechanic installed this:
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Old 09-19-2017, 09:18 AM   #3
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Thanks. That helps answering the water flow direction question!
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Old 09-19-2017, 10:58 AM   #4
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Second question. It says I need to block an oil passage with a supplied plug. I'm assuming the old pump need to be lubricated by the engine oil and the new one does not. Do I need to put grease on the gear then before installing the new one?


Your correct the new pump does not require the same oil requirement as the old longer set up and it's bearings inside , the new gear and bearing right behind the gear is all lubricated by the oil splashing around in the front gear casing, No need to put grease but some engine oil on the gear wont hurt!

Cheers Steve
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Old 09-19-2017, 12:58 PM   #5
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The impeller for the Johnson pump is NOT the same as the Jabsco. The Jabsco impeller is about 1mm taller than the Johnson, and will be too tight causing wear on the end plates in the pump. I found that even with the Johnson impeller, I was replacing the cover plate due to wear every couple of years.
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Old 09-19-2017, 03:19 PM   #6
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I rotated mine from vertical as shown in the above picture because I could not access the drain plug on the injection pump.
A few degrees made a huge difference in accessibility.
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Old 09-21-2017, 10:42 AM   #7
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Quick question Jay. Can you rotate it the way your want? Don't you have to align the bolts holes in the pump's flange with the ones on the engine?
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Old 09-21-2017, 12:54 PM   #8
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If you look at your picture the part that bolts to the engine has a split clamp. You can loosen, rotate into the position you want, then tighten the clamp bolt.
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Old 09-22-2017, 07:50 AM   #9
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Great! What about the 2 gaskets that I have in the box. Should I use them both?
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Old 09-22-2017, 08:39 AM   #10
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Should not require two gaskets, one is the norm however a little gasket shellac and or similar sealant on both steel faces would be a prudent move,

Just be sure both faces are nice and clean

Cheers Steve
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Old 09-22-2017, 10:11 AM   #11
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I don't use any sealer, just the one gasket.
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Old 09-22-2017, 10:17 AM   #12
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Yep some are lucky others not! , Dont for get inside that gear housing is hot oil flying around (nope no pressure-just a lot of hot thin oil) but that oil will find any tiny imperfection on one face and it will leak for sure,

As I first line :You feeling lucky !!
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Old 09-22-2017, 01:41 PM   #13
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I was referring to the impeller housing gasket. If I misinterpreted the question, my bad.
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