Switching lower unit's between a 20" and 25"

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eppisar

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I have a sweet running Johnson 140 with 20" shaft. Problem is my boat has a 25" Transom. I recently bought a 140 with a blown power head, but it has the 25" shaft, and is the same year as mine. (1980) Is this a fairly simple swap? Does anyone have any experience with this? Thanks
 
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wilde1j

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Re: Switching lower unit's between a 20" and 25"

Should be easy. If you've ever changed a water pump, not much more to it. The water tube and exhaust housing need to be moved. Take a look here to see the specific parts involved:
http://shop2.evinrude.com
 
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eppisar

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Re: Switching lower unit's between a 20" and 25"

Thanks Jim

That's what I'm being told, just wanted to make sure. What do you mean about moving the water tube and exhaust housing?
 
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wilde1j

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Re: Switching lower unit's between a 20" and 25"

You will need the longer water tube from the 25" motor. The tube connects the water pump outlet to the powerhead. If you look at the parts list, it will be obvious. See parts # 15 and # 68 on the parts list for the exhaust housing, inner and outer.
 
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eppisar

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Re: Switching lower unit's between a 20" and 25"

I see what you mean. This diagram also shows a different part # for the steering arm assembly for the 20 and 25 in version ?
 
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Chris1956

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Re: Switching lower unit's between a 20" and 25"

Isn't is easier to swap power heads?
 
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eppisar

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Re: Switching lower unit's between a 20" and 25"

I guess that's the question, although it does seem fairly simple to change the exhaust housing(s) and the water tube, and since I'll be servicing the lower anyway........? I'm assuming I'll need to change the shaft seal as well. I believe its just a couple of O-rings, right?
 
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