Few Questions

[58 EvinRude]

I have a 58' 7.5hp Evinrude And While Running it Becomes "Burn You Hot" even on shaft and the water pump is working because in Neutral it spits water alot and on the water Yesterday "First Time" it just STOPPED and we couldnt even spin head to start so We take it out of water and went home and it started right up "over heating maybe?" and What kind of Lube should I use to replace lower gearing lube Because it looks white and kinda milky and thats not good and the Knobs for high and low speed is off i was told 3 full spins for high hand 2 1/2 for low is that correct. And one more question its 8 oz. to 1 gallon unleaded right

 

[tashasdaddy]

Re: Few Questions

it is a 24:1 fuel ratio motor, 1 gallon fuel- 5.5 ounces of TC-W3 outboard motor oil. sounds like it is definately over heating, when was the impeller last changed? the motor does not have a thermostat. so you either have a block cooling system, or failed impeller.

 

[58 EvinRude]

Re: Few Questions

Yea I contacted my local marina and he said its a 50:1 for a 58 evinrude and he said same thing about cooling system but The BIGGEST problem is the fact that im dumb when it comes to boats but we all have to start some where and the impellar what does that do and explain the diffaculty of those repairs..and the motor starts back up after seizing the marina guy said its from Something "forgot what he said" is swealing up from the heat thats why after a 10 mins or so of cooling it starts back up...Thanks

 

[tashasdaddy]

Re: Few Questions

the impeller is the rubber finned blade in the water pump, that spins and pumps the water. should be changed every 2 years. your motor is 24:1 not 50:1. changing the impeller is fairly simple. but if you are not mechanically inclined, get someone to do it. it's a 20 minute job. the water pump kit is part # 763758 , it is a Johnson/Evinrude part only, not aftermarket parts. see your local dealer. if you feel comfortable tackling the job. we can give you directions.

 

[58 EvinRude]

Re: Few Questions

Not too Sound stupid but where is the water pump actually located???Do You have to take off other parts to get to it and if so like???But what im not understanding is the fact that it blows water out like crazy like its working fine but can that still mean that the impellar is bad? Thanks

 

[tashasdaddy]

Re: Few Questions

yes, and i added more to the other post above. if the impeller is worn, missing blades, it will not pump enough water to cool the motor. it looses grip at higher rpms.

 

[Xcusme]

Re: Few Questions

Running your motor at 50:1 is very risky. Take the advice and run at a 24:1 mix.

The motor is stopping because the pistons are expanding in their bores when overheated. Find the reason for the overheat. Replace water pump assembly. and retest. If it's still over heating, pull the head and clean the water passages.

These testing procedures are clearly outlined in a service manual, it's time to buy one now.

 

[58 EvinRude]

Re: Few Questions

Ok Thanks for your advice i will run it at 24:1 to be safe and I dont believe there is a local Johnson/Evinrude Dealer Around me (Southeast Michigan) I will look into the part number and proably get one if in my budget I will reply if i have anymore questions thanks


P.S Directions would be wonderful if you could and if you send it in message to my name so I Always have it Thanks Again

 

[dajohnson53]

Re: Few Questions

Ok Thanks for your advice i will run it at 24:1 to be safe and I dont believe there is a local Johnson/Evinrude Dealer Around me (Southeast Michigan) I will look into the part number and proably get one if in my budget I will reply if i have anymore questions thanks


P.S Directions would be wonderful if you could and if you send it in message to my name so I Always have it Thanks Again

If you're running it at 50:1, that could be contributing to the over heat as well as a poor water pump or restricted water passages. All of these are possible issues.


As for getting the water pump changed - this is just a good maintenance item which should be done every couple of years or so. So, even if you're not sure it needs it, it's a good place to start anyway.

Any outboard mechanic should be able to do it, he doesn't need to be a Johnson/Evinrude dealer. If you don't have one that you've been using, ask around or look in the yellow pages. The mechanic should be able to give you an accurate price estimate for labor and parts, and it shouldn't be more than 1/2 hour labor unless there's a problem (which can happen with old engines!)

Good luck and report back, I'm curious how it turns out.

 

[MrGED05]

Re: Few Questions

Milky white gear lube is contaminated by water. Water is NOT an adequate lubricant for the lower end of an outboard motor. The seals for the lower end will HAVE to be replaced. Yes, you could possibly get by for one or two short trips by just replacing the lube with fresh each time you run the motor. I wouldn't count on it. Replacing the transmission will be expensive and time consuming and the parts will be difficult to find. Replace the seals and gaskets.
The flow of water out the "pee tube" indicates that your impeller is functioning. It does not necessarily indicate that the coolant flow is sufficient or going through the engine block as it should. If just one or two or just small chunks of the impeller arms has broken off, the impeller will still pump water but the flexible pieces could have been forced up into the cooling passages and blocked the flow.
Check the impeller, even if it is ok, it is old and should be replaced just as a preventive measure. They're cheap and available through O'Reily Auto parts and other chain automotive parts stores.

 

[tashasdaddy]

Re: Few Questions

MrGED05, i don't think anyone question whether is lower unit was leaking. the 1958 7.5 did not have a pee stream persay. it has exhaust releif ports. if you had read the above post, you would know the part are not available at O'Reily, the are only available as mentioned thru the dealer, there is not an aftermarket part.

 

[MrGED05]

Re: Few Questions

Gator fan,
Thanks for correcting my nomenclature. Sorry if "pee hole" offended you.
Side note, I own and have rebuilt my mid 50s Johnson 7.5 hp outboard. And, I did indeed get an aftermarket impeller from my local O'Reily auto's marine catalogue. Do you think the chain stores use different suppliers in various locations? Be good to know, we could all frequent those that have the best aftermarket suppliers.
Gary

 

[wbeaton]

Re: Few Questions

TD said there is no aftermarket water pump kit, which is more than just an impeller. An impeller you can get just about anywhere.

If there is water coming out the exhaust then the water is getting through the block. What you are experiencing is (likely) due to inadequate water flow at high speed. This is usually due to a worn impeller, water pump housing or restriction.

Getting an impeller "if your budget allows" is ridiculous. Don't run it again until you replace it. The next time it overheats may be the last time.

I love my 1958 Evinrude 7.5 hp. Its the only 7.5 hp I won't get rid of. And I have a few of them (1954, 1955, 1956 x 2, 1957 and 1958).

 

[58 EvinRude]

Re: Few Questions

I found a Impeller at my local Napa Dealer but Now it Comes Down to Is my Father and I Are capiable of changing it and im not takin it out unless it gets fix and if i cant then im going to sell and get new that hopefully doesnt have anything wrong with it for a little bit anyways but i found pictures and step by step directions but its for 57 5.5 hp johnson are they similar in design or no and if i bought a manual would it have that procedure in it?

 

[wbeaton]

Re: Few Questions

The 5.5 hp is the exact same. Use that procedure.

 

[F_R]

Re: Few Questions

I don't see where anybody has said that the powerhead has to come off in order to disconnect the shift rod. No way is a novice going to do it in a half hour.

Pay attention to the carbon seal that you will find when you get the powerhead off. Replace the gasket and o-ring associated with the seal. You also will need a new powerhead gasket.

If you don't do it right, you will screw up an otherwise fine motor. If you haven't already screwed it up by running it hot repeatedly. What a shame.