18hp Johnson repair/questions. How to turn it off?

[BigB9000]

motor tag:

anyone know the year/hp?


so, onto my first question.
The pull starter rope takes it sweet time going back it. After about half way in it'll just stop, and to get it back in you have to help it go in. (by shoving it in there)

So how do I rewind this thing?:

#2 What is this thing? Some kind of aftermarket anoid?

#3 Is the thermostat located here:

#4 How do I remove the lower unit for impeller changing?
It not like my 78-83 115hp engines. The shifter looks to be located inside the mid section, thus the top not being accessible. So I drop the lower a few inches, thus exposing the rod? or is there some type of access plate on the side?

#5 50:1 or 24:1 ?

#6 lower unit fluid type?

#7 what are these 2 wires for?

 

[tashasdaddy]

Re: 18hp Johnson repair. Lots-o-questions

Re: 18hp Johnson repair. Lots-o-questions

1st it is an Evinrufe 18hp 1966 50:1 fuel/oil mix. manuals http://www.outboardbooks.com/index.cfm?fuseaction=models.main&year=1966&ID=60719

recoil, what i have done, is to turn the recoil base, to free up some line, holding the base, work the rope around the base, to tighten the spring. this is not the correct way, but a heck of a lot simpler, than doing a disassemble.
if may take 2 turns, also a bath in WD 40, thru the edge crack may help.

looks like an anode, very old.

yes tstat under the triangular plate. http://www.iboats.com/mall/partfind...gd_poid=111071&gd_row=10&**********=237752268

should be a 1" by 3" plate with screw top and bottom on the side of the leg, remove cover and disconnect linkage.

regular 80/90 lower unit oil.

no idea what the wire is, looks like a broken bracket there, wider view to see more about where it is.

great reliable motor, when tuned up.

 

[BigB9000]

Re: 18hp Johnson repair. Lots-o-questions

Re: 18hp Johnson repair. Lots-o-questions

1st it is an Evinrufe 18hp 1966 50:1 fuel/oil mix. manuals

How did you figure that out?

should be a 1" by 3" plate with screw top and bottom on the side of the leg, remove cover and disconnect linkage.

Gotcha

After I pull those 2 screws out, how do I reassemble? Wouldnt the 2 little brackets just fall down?

regular 80/90 lower unit oil.

The same stuff my 83 115hp uses?

no idea what the wire is, looks like a broken bracket there, wider view to see more about where it is.

Looks like something went there....

 

[tx1961whaler]

Re: 18hp Johnson repair. Lots-o-questions

Re: 18hp Johnson repair. Lots-o-questions

1. After I pull those 2 screws out, how do I reassemble? Wouldnt the 2 little brackets just fall down?

2. The same stuff my 83 115hp uses?


3. Looks like something went there....

1. Only take the bottom screw completely out. Leave the top one in tight. The shift rod will come out of the bottom one.
2. Yes, same lube.
3. Those two wires look like the wires that go to a kill switch. They run to the points. If they're connected together, the engine quits.

 

[BigB9000]

Re: 18hp Johnson repair. Lots-o-questions

Re: 18hp Johnson repair. Lots-o-questions

while trying to figure out how to make the thing tighter, I pulled the rop all the way out, and discovered this:

Should I replace the whole rope? Its 5 feet long now, does it need to be that long?

So, how do I change the rope? (if I should)

 

[F_R]

Re: 18hp Johnson repair. Lots-o-questions

Re: 18hp Johnson repair. Lots-o-questions

Absolutely, replace the rope now, before it breaks. If/when it breaks it will destroy the recoil spring. Use the correct length and diameter rope (all it will hold). A too-short rope is a PIA to crank.

See the approx 1/8" diameter hole in the rope pulley? Find a nail or something that will fit through that hole. Then pull the rope out all the way and stick the nail in the hole. That will keep the pulley from unwinding. Now you can take all day to remove and install a new rope. When done, hang onto the rope while removing the pin and let it recoil.

If you haven't already done so, spray some WD-40 on the spring and around the center spindle. Gummy lube is what is making it recoil slowly.

 

[BigB9000]

Re: 18hp Johnson repair. Lots-o-questions

Re: 18hp Johnson repair. Lots-o-questions

....

Ah, perfect instructions, thanks!

In theory, couldn't I get another spin out of it after the rope out to get a little more tension on it?

 

[BigB9000]

Re: 18hp Johnson repair. Lots-o-questions

Re: 18hp Johnson repair. Lots-o-questions

Also- does this thing have a tell-tail/pee stream?

 

[tashasdaddy]

Re: 18hp Johnson repair. Lots-o-questions

Re: 18hp Johnson repair. Lots-o-questions

figured out what it was by the model #. no tale tell per say. you get mist and drops out the exhaust relief port of the back of the leg.

 

[BigB9000]

Re: 18hp Johnson repair. Lots-o-questions

Re: 18hp Johnson repair. Lots-o-questions

figured out what it was by the model #. no tale tell per say. you get mist and drops out the exhaust relief port of the back of the leg.

yeah, but is there some kind of internet chart thing? link? that way I dont have to search/post to figure out the year/hp

 

[lindy46]

Re: 18hp Johnson repair. Lots-o-questions

Re: 18hp Johnson repair. Lots-o-questions

yeah, but is there some kind of internet chart thing? link? that way I dont have to search/post to figure out the year/hp

Pre-1980 Evinrude models:
http://www.marineengine.com/manuals/evinrude/

Pre-1980 Johnson Models:
http://www.marineengine.com/manuals/johnson/

 

[jbjennings]

Re: 18hp Johnson repair. Lots-o-questions

Re: 18hp Johnson repair. Lots-o-questions

Those are definitely the kill switch wires in your pic--I have the same or almost the same motor.
Whatever that is under that bracket screw that is broken I don't believe is factory and I don't think it will affect the running of the motor.
I prefer 6 feet of starter rope.

That zinc anode was definitely an "add-on" and I personally would remove it immediately, not that it causes any huge problems but looks like it would mess up the flow over the cavitation plate somewhat. Makes me suspicious that motor saw a little saltwater use.
Later,
JBJ

 

[Woodstock60]

Re: 18hp Johnson repair. Lots-o-questions

Re: 18hp Johnson repair. Lots-o-questions

Judging by the photos, she looks pretty beat up. would suggest a compression test before spending too much $$, Does it have an electric starter?

 

[BigB9000]

Re: 18hp Johnson repair. Lots-o-questions

Re: 18hp Johnson repair. Lots-o-questions

Judging by the photos, she looks pretty beat up. would suggest a compression test before spending too much $$, Does it have an electric starter?

No on the electric start.

And yes it looks like crap. compression turned 105 on each cylinder with 2 or 3 pulls. Bolt hears are rusted, but all so far have come right out.

 

[BigB9000]

Re: 18hp Johnson repair. Lots-o-questions

Re: 18hp Johnson repair. Lots-o-questions

Onto the lower!

So I dropped the lower today to get to the water pump. Water pump is soft and pliable, Ill replace it anyway, but no problems there.

However, I started playing with the drive shaft.

If you push it down and turn it, it sounds like its making a grinding noise a bit, then something catches and prop turns .

In the video Im turning the shaft back and forth, in a clockwise and counter clockwise position, it'll only do the grinding noise until it catches whatever down there

http://www.youtube.com/watch?v=a3sB7Xa3q3U


Now then, if you pull the shaft up 1/8 of an inch up, the noise goes away.


http://www.youtube.com/watch?v=kq7C5IxJdiI


...so, any ideas if that is normal?

Onto the next point of interest, on every other lower unit I have removed, I can't simply pull the shaft out. On this I can:

both shaft ends look good and not ground down, and fluid is clean and has no metal shavings.

Should I replace that seal?

I was looking on shop.evinrude.com to see how much gears were going to cost me if that were the case,

33 0378079 GEAR& BUSHING, Forward $500.53

Can that be right? I understand the pay-to-play thing, but $500?!

 

[jasper60103]

Re: 18hp Johnson repair/questions. Onto the lower unit!

Re: 18hp Johnson repair/questions. Onto the lower unit!

If you push it down and turn it, it sounds like its making a grinding noise a bit, then something catches and prop turns .

That something that catches is the clutch dog (#31) engaging with the gear. This causes the prop to turn. Lift the shift rod for forward gear, push down the shift rod for reverse gear. While turning the driveshaft clockwise, I would make sure the prop changes direction when you shift the gears, and neutral should be in between. Unless you're having problems shifting or something, I would leave it alone and just refill with fresh lube. Be sure to replace the vent/fill plug washers. Gear parts are expensive. Don't want replace unless it's necessary.

on every other lower unit I have removed, I can't simply pull the shaft out. On this I can:

Yep, this is normal. Mine pulls out easily too.

Should I replace that seal?

Did you notice any water in the lube? Not knowing the history, I would probably leave it. If your gearcase is leaking, best to do a reseal on the gearcase. In case you do want to replace the driveshaft seal. This tool rips it out in less than a minute.

 

[lindy46]

Re: 18hp Johnson repair/questions. Onto the lower unit!

Re: 18hp Johnson repair/questions. Onto the lower unit!

"If you push it down and turn it, it sounds like its making a grinding noise a bit, then something catches and prop turns ."

Grinding noise is not normal - drain oil and check for metal filings in lower unit. May be something worn in there.

 

[jasper60103]

Re: 18hp Johnson repair/questions. Onto the lower unit!

Re: 18hp Johnson repair/questions. Onto the lower unit!

Yea, I'm thinking the grinding noise could be from working it dry or he could be binding it while pushing down on the driveshaft.

 

[F_R]

Re: 18hp Johnson repair/questions. Onto the lower unit!

Re: 18hp Johnson repair/questions. Onto the lower unit!

"If you push it down and turn it, it sounds like its making a grinding noise a bit, then something catches and prop turns ."

Grinding noise is not normal - drain oil and check for metal filings in lower unit. May be something worn in there.

Sorry, but grinding noise while pushing down on the shaft IS NORMAL!! The shaft is pressing down on the pinion gear, forcing it into the teeth of the other gears and removing the normal "lash" or clearance that exists between the teeth. When the motor is running, normal torque on the parts forces the gears apart as far as they are allowed to go by design, restoring the normal lash, and they will be quiet.

As somebody already said, the movement before the prop shaft starts to turn is also normal. When running, the forward and reverse gears are spinning in opposite directions and the clutch dog has to catch them "on the fly". Therefore they allow plenty of room for the dog to slide in without excessive banging and wear.

It ain't broke....

 

[BigB9000]

Re: 18hp Johnson repair/questions. Onto the lower unit!

Re: 18hp Johnson repair/questions. Onto the lower unit!

It ain't broke....

I love this forum.