75 evinrude leaking oil - The HuntingPA.com Outdoor Community
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post #1 of 12 (permalink) Old 09-23-2011, 12:47 AM Thread Starter
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75 evinrude leaking oil

Hi i have a 75 6hp evinrude when i fill it up with gear oil it leaks out from behind the prop i removed the prop to find fishing line wrapped all around the shaft. my question is what parts do i need to fix it and do u think i can do it myself or should i take it to the shop any help would be greatly appreciated thanks
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post #2 of 12 (permalink) Old 09-23-2011, 12:16 PM
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Re: 75 evinrude leaking oil

Sounds like the line got in and ground up the prop shaft seal. taking the lower unit apart can be 'interesting'. If you have never done complex outboard service you would be better with a dealer. Parts should be available, but easier for the dealer to get than you, 1975 is 35 years old.

Other seals and gaskets could also cause this, but I'm relating it to the fishing line.

Usually this is caused by a lower seal leaking and letting water into the casting. Then over the winter the water freezes and expands to crack the lower unit housing casting. but if this just happened, hot weather. But still check the lower hoousing casting closely.

As long as the lower prop housing is being taken apart, on a motor this old, I'd change all the shaft seals and the gaskets.

I'd also suggest a professional as the shaft can have shims to keep it aligned properly and if not in alignment it will vibrate and ruin the two lower prop shaft bearings.
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post #3 of 12 (permalink) Old 09-23-2011, 07:04 PM Thread Starter
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Re: 75 evinrude leaking oil

thanks for the advice actually i dont know when it happened i bought the motor for 50 bucks off craigslist so your prolly right the case may be cracked.
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post #4 of 12 (permalink) Old 09-24-2011, 11:13 PM
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Re: 75 evinrude leaking oil

these things are fixable. that '75 6 horsepower is a great motor and will run forever. parts are available (props are a little pricey). And they are worth fixing.

I bought my younger brother one about 5 years ago and rebuilt it: carb, lower unit seals and bearings, impeller, propeller, points and condensers. It really is a straight forward design. Now that motor runs better than any new 6 horsepower. Great trolling motors as they can be adjusted down to low prop speed (so you can see it turn) great for trolling for walleyes.
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post #5 of 12 (permalink) Old 09-26-2011, 05:46 PM Thread Starter
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Re: 75 evinrude leaking oil

ive been told by alot of people the same thing about these motors they run great im just a little nervous about the cost id like to have it ready for duck season if u wouldnt mind could u tell me about how much it ran u to fix up the u gave to your brother
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post #6 of 12 (permalink) Old 09-27-2011, 09:43 PM
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Re: 75 evinrude leaking oil

I had about $70 in parts, plus the new prop which IIRC was about $90. Maybe your prop is OK the one I fixed had one blad broken completely off. Props can also be repaired reasonably.
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post #7 of 12 (permalink) Old 09-27-2011, 09:43 PM
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Re: 75 evinrude leaking oil

plus my time
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post #8 of 12 (permalink) Old 09-28-2011, 12:59 AM
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Re: 75 evinrude leaking oil

If you bought for 50 bucks you probably got a decent deal. I used to have a 71 Johnson 6 hp, and never had proplems getting parts. Only ever had to replace the points, and it ran perfect. Just didn't have enough power to get me boat on plane when I got a wider boat.
These motors are very easy to work on. Just got to go order the parts. If you can change th oil in your car you should be able to replace a seal in the lower unit. If you can't tell the difference between a slotted and phillips head screw driver get someone else to do it.

Venison - The other fast food
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post #9 of 12 (permalink) Old 09-28-2011, 04:07 PM Thread Starter
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Re: 75 evinrude leaking oil

yes my prop and everything else is fine this is my only problem and yes i can tell the difference between screwdrivers thank u all for your help
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post #10 of 12 (permalink) Old 09-28-2011, 04:28 PM
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Re: 75 evinrude leaking oil

try it Quackslacker.
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