Topic: 1957 Evinrude Fleetwin 7.5 HP (Update)Impeller Question)

This topic has 20 replies, 9 voices, and was last updated 5 years, 11 months ago by cesarp35.

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March 28, 2018 at 5:36 am #9510
cesarp35
Participant
Hey guys, this is the little brother to the 1957 Evinrude Fastwin 18hp that i just got going, this 7.5hp came with my 1966 Alumacraft boat that i just purchased about 3 months ago, i don’t really know the history on this motor only that it ran a few years back, anyway she seems to run really good my only concern is that after idling for about 10 minutes in the bucket i touch the lower exhaust unit and it feels like it’s on the hot side not warm, does it look like the impeller is pumping enough water through the spout? or maybe the impeller is getting tired and needs replacement? your input is appreciated. Thanks
https://youtu.be/vXzTtZ4o7gQ
March 28, 2018 at 10:02 am #73148
1957evinrude
Participant
US Member
If it was my engine I would replace it.You don’t want to risk burning up your motor. Its a nice one.
March 28, 2018 at 10:12 am #73150
jerry-ahrens
Participant
US Member
Looks a little feeble on the output to me. I would also replace it, to be safe. Boy, you sure did score a couple nice motors there! Those are nice ones. I have the 35 hp in that line up.. it’s a really clean original like yours. To bad we can’t get them together for a reunion!
BTW, the fuel oil mix on your 7 1/2 Fleet Twin is 16/1. It needs more oil than your 35.
March 28, 2018 at 10:47 am #73151
vintin
Participant
An old impeller can become brittle and lose parts that end up plugging up the cooling system.
March 28, 2018 at 10:55 am #73153
fleetwin
Participant
US Member - 2 Years
Ditto, see my youtube comments also….Don
March 28, 2018 at 12:34 pm #73156
fisherman6
Participant
US Member - 2 Years
Very nice Fleetwin! See my YouTube comments as well. I’m addition to the water pump service you may want to pressure test (or vacuum) the gearcase. While the powerhead is off and the lower unit is removed is perfect time to reseal it if that is required. The shift rod O-ring is notorious for leaking on these motors after all those years. On motors with low hours often the shaft seals are OK but that O-ring will let water in. Unfortunately the gearcase has to be disassembled to replace that O-ring, but while all the other work is being done and it is already apart is the time to replace it.
-Ben

OldJohnnyRude on YouTube
March 28, 2018 at 4:21 pm #73162
cesarp35
Participant
I’ll be ordering the impeller and lower unit seal kit just to be on the safe side, i’d rather be safe than sorry later. Thanks for the advise and suggestion guys i appreciate it!!!!
March 29, 2018 at 3:44 am #73185
crosbyman
Participant
Canada Member - 2 Years
https://www.youtube.com/watch?v=SVOedhzPP7M

somewhat ..easy job

https://www.youtube.com/watch?v=tA0u62hciwY

https://www.youtube.com/watch?v=pX1u6rtUE1M

Joining AOMCI has priviledges 🙂
March 29, 2018 at 12:30 pm #73194
1957evinrude
Participant
US Member
quote crosbyman:

https://www.youtube.com/watch?v=SVOedhzPP7M

somewhat ..easy job

https://www.youtube.com/watch?v=tA0u62hciwY

https://www.youtube.com/watch?v=pX1u6rtUE1M

I have watched his videos several times. I’m not much of a mechanic but trust me its not a bad job at all to take apart the l/u and pull the powerhead. Just be sure and replace the o ring and seal under the power head and the base gasket
March 29, 2018 at 7:46 pm #73208
cesarp35
Participant
quote crosbyman:

https://www.youtube.com/watch?v=SVOedhzPP7M

somewhat ..easy job

https://www.youtube.com/watch?v=tA0u62hciwY

https://www.youtube.com/watch?v=pX1u6rtUE1M

Thanks for the info Crosbyman!
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