Topic: 1959 Evinrude 18HP has power, moves water but…. – Page 2

This topic has 22 replies, 9 voices, and was last updated 7 years, 11 months ago by harpua.

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May 2, 2017 at 2:18 pm #56994
harpua
Participant
quote Chinewalker:

Well THERE’S your problem! You need a long shaft extension kit for your 18. You’re ventilating the prop once the water breaks from the transom. Ventilation is NOT the same as cavitation. I’m pretty sure I have the extension housing and possibly some of the other bits, too.

thanks. what does extending it entail?
May 2, 2017 at 2:21 pm #56995
chinewalker
Participant
US Member
You would need:
Outer 5-inch extension housing.
5-inch longer driveshaft.
5-inch water tube extension (or a 5-inch longer water tube).
5-inch shift rod extension (or a 5-inch longer shift rod – requires gear case disassembly).
Four more 1/4"-20 bolts and one 5-inch longer rear bolt.
May 2, 2017 at 2:27 pm #56996
harpua
Participant
quote Chinewalker:

You would need:
Outer 5-inch extension housing.
5-inch longer driveshaft.
5-inch water tube extension (or a 5-inch longer water tube).
5-inch shift rod extension (or a 5-inch longer shift rod – requires gear case disassembly).
Four more 1/4″-20 bolts and one 5-inch longer rear bolt.

thanks.. too much work for me this year. I will probably end up selling her. no need to mess up a good thing. someone else can use her now that I redid the fuel lines, cleaned carb and found a very good gas tank for her.

I am going to put her in a can and make sure the prop isnt slipping also. thanks for the information.
May 2, 2017 at 2:32 pm #56999
chinewalker
Participant
US Member
Won’t take but an hour, or less if you have the parts. The driveshaft just pulls right out. Good chance to replace the waterpump impeller, too if you haven’t already.
May 2, 2017 at 3:28 pm #57000
fisherman6
Participant
US Member
Chinewalker is correct about your problem being VENTILATION rather than CAVITATION. My bad on the improper terminology. 😳

He’s also right about it being a pretty quick job if you have the parts. You can sell the motor if you like, but it’s not really that much work to convert it. With what you have already done to it, most of your work is already complete.
-Ben

OldJohnnyRude on YouTube
May 2, 2017 at 3:59 pm #57002
harpua
Participant
quote Fisherman6:

Chinewalker is correct about your problem being VENTILATION rather than CAVITATION. My bad on the improper terminology. 😳

He’s also right about it being a pretty quick job if you have the parts. You can sell the motor if you like, but it’s not really that much work to convert it. With what you have already done to it, most of your work is already complete.
-Ben

you are right on most accounts but i have been a tinkerer all my life and understand the number one rule of it. there is always something else. I can imagine that water line being a son of a gun to get out after almost 60 years. I am also a firm believer in if it aint broke, dont fix it. (most times at least 😉

and at this point i have to wonder how much money i can actually spend. I already am farther in than i wish to be honestly. I need a faster engine this summer and wasnt looking for a project. quick edit: this engine was serviced 3 years ago. new gear oil, carb kit. it didnt even looked like it was run at all after service. there was just a little bit of ether build up from the guys kid trying to start it with just starter fluid and a gas rag…lol

She is a swell motor, really dont want to sell her. but i need a bigger engine if the family is tagging along.
May 7, 2017 at 6:48 pm #57256
harpua
Participant
quote Chinewalker:

Won’t take but an hour, or less if you have the parts. The driveshaft just pulls right out. Good chance to replace the waterpump impeller, too if you haven’t already.

the more i look around at engines, jack plates…..sawing the transom…lol this seems like the easiest and most viable option. Why didnt you guys say something? 😆

i am worried and heard some horror stories about the water tubes being hard to get out after so long, but you say there is an extension? do you have all the parts? and if so maybe PM me a price or give a roundabout here? thanks

i had her in a can and went WOT and didnt get the "slip" but i would really like to put her on a lower transom boat to rule out prop hub before i rip her open. I know she was serviced 3 years ago, but it wouldnt hurt to put a new pump, impeller and see whats going on in there.

i bet the 1960’s models were some of the best made. this engine is so simple and has such potential mechanically. its pretty simple and solid. easy to work on..
May 8, 2017 at 3:01 am #57273
garry-in-michigan
Participant
Lifetime Member
You don’t have to take out the water tube. just put in the 5" extention. I had a tool to hammer into a copper tube to expand it so it would slip over the water tube to make the 5" extension. The factory uses an "O" ring to seal the extension, I used solder. The only water tube extension I can come up with is for the Evinrude Big Twin. I believe the 18 is a smaller diameter. . . 🙄
May 8, 2017 at 12:03 pm #57282
crosbyman
Participant
Canada Member
would one of those flip down (bolt on) motor mounts help any ?

you could just lower the engine down when needed and flip it up when done .

I see them often on Kijiji -craiglist
https://i.ebayimg.com/00/s/NjAwWDgwMA== … F/$_35.JPG

Joining AOMCI has priviledges 🙂
May 8, 2017 at 12:29 pm #57284
harpua
Participant
quote crosbyman:

would one of those flip down (bolt on) motor mounts help any ?

you could just lower the engine down when needed and flip it up when done .

I see them often on Kijiji -craiglist
https://i.ebayimg.com/00/s/NjAwWDgwMA== … F/$_35.JPG

thanks, i thought of this too. i think they are called jack plates. i havent found them for less than $175, though i would be interested to know if they are called something else or are cheaper
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