Trying to rebuild 18 hp Johnson

[ccvolsdhf]

Re: Thinking of trying to rebuild 18 hp Johnson

Re: Thinking of trying to rebuild 18 hp Johnson

Cool Thanks for the info probably have half that stuff already ,and can definatly see needing the other half. Yeah 70$ is not bad at all for the amount of parts I could salvage. I don't think I need the throttle stuff manily the carb and everything attached to it the water tube and that fuel pump, But would be awsome just to have the whole thing. Let me know what else you would be keeping,and we can try and work somthing out.

 

[ccvolsdhf]

Re: Thinking of trying to rebuild 18 hp Johnson

Re: Thinking of trying to rebuild 18 hp Johnson

Lower unit cleaned!

 

[ccvolsdhf]

Re: Thinking of trying to rebuild 18 hp Johnson

Re: Thinking of trying to rebuild 18 hp Johnson

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[ccvolsdhf]

Re: Thinking of trying to rebuild 18 hp Johnson

Re: Thinking of trying to rebuild 18 hp Johnson

So the parts that where easy are clean. I'm gonna check out the link KFA posted and see if I can get the seals out. I can see the drive shaft and propeller seal ,but the shift rod seal and and pivot pin seal are eluding me. Ill have to dig further and see if I can locate them. Probably a dumb question but do the seals have to come out. I'm guessing new ones improve water not being where it's not suposed to be. Also any one have any sugestions on removing the paint from the Lower unit case. Could I use an automotive paint on paint stripper or is sanding it my best option. At this time hand sanding would be my only option, and I'd like the final paint job to look as good as possiable....Thanks

 

[1946Zephyr]

Re: Thinking of trying to rebuild 18 hp Johnson

Re: Thinking of trying to rebuild 18 hp Johnson

Parts like that, I pour a bunch of gasoline in a drain pan and scrub them down with a parts cleaning brush. Anything you want totally clean afterwards, as far as getting rid of oil based residue, spray it down with brake/carburetor cleaner.

 

[kfa4303]

Re: Thinking of trying to rebuild 18 hp Johnson

Re: Thinking of trying to rebuild 18 hp Johnson

Hello again cc. the shift rod seal is pressed underneath a brass bushing in the LU. You can see how they punch it out in the link I sent you. Some folks make a special tool, but I just used the drill bit/ratchet extender method shown in the link. The actual seal is a little, fat o-ring. You just set it in place them tap the bushing back down on top of it. A bit of vaseline on the tip if the lower shift rod will help it slip through the new grommet/o-ring with ease. The pivot pin seal in a little, thin o-ring that goes under the phillips head screw in the lower unit. All of the old seals have to come out and you should try to clean up their respective housings so the new seals can fit nice and snug. A bit of the 3M 847 gasket sealer around the seals helps too. Once the old seals are out the new ones just pop right in. Keep us posted. Holler if you get stuck. Here are some pics of a typical seal kit, a seal puller, and a the pivot pin.

 

[ccvolsdhf]

Re: Thinking of trying to rebuild 18 hp Johnson

Re: Thinking of trying to rebuild 18 hp Johnson

Parts like that, I pour a bunch of gasoline in a drain pan and scrub them down with a parts cleaning brush. Anything you want totally clean afterwards, as far as getting rid of oil based residue, spray it down with brake/carburetor cleaner.

Thanks Zephyr...Yeah I bought engine Degreaser like a Dummy....And couldn't get all the residue off Ill try gasoline and brake cleaner today

 

[ccvolsdhf]

Re: Thinking of trying to rebuild 18 hp Johnson

Re: Thinking of trying to rebuild 18 hp Johnson

Hello again cc. the shift rod seal is pressed underneath a brass bushing in the LU. You can see how they punch it out in the link I sent you. Some folks make a special tool, but I just used the drill bit/ratchet extender method shown in the link. The actual seal is a little, fat o-ring. You just set it in place them tap the bushing back down on top of it. A bit of vaseline on the tip if the lower shift rod will help it slip through the new grommet/o-ring with ease. The pivot pin seal in a little, thin o-ring that goes under the phillips head screw in the lower unit. All of the old seals have to come out and you should try to clean up their respective housings so the new seals can fit nice and snug. A bit of the 3M 847 gasket sealer around the seals helps too. Once the old seals are out the new ones just pop right in. Keep us posted. Holler if you get stuck. Here are some pics of a typical seal kit, a seal puller, and a the pivot pin.

Great Thanks a bunch Kfa....That seal kit picture tells the tell.... so thats cool I already scraped out the piviot pin one then,and was wandering if some of the other ones where in the kit. First thing on my list to do today is check out the link you gave and try and get them suckers out. The gasket under the water pump was none exsting that was probably some of my black debries, so all I have left is the shift rod o ring,drive shaft seal and prop seal. Again Thanks for your help.

 

[tosoutherncars]

Re: Thinking of trying to rebuild 18 hp Johnson

Re: Thinking of trying to rebuild 18 hp Johnson

IM sent re: service manual.

 

[tosoutherncars]

Re: Thinking of trying to rebuild 18 hp Johnson

Re: Thinking of trying to rebuild 18 hp Johnson

Email sent; enjoy!

 

[ccvolsdhf]

Re: Thinking of trying to rebuild 18 hp Johnson

Re: Thinking of trying to rebuild 18 hp Johnson

OK got a question. I'm trying to order the lower unit reseal kit. I checked here on Iboats and the #'s they give me for 59' 18HP Johnson is
18-2684 Sierra
9-74105 Mallory

So on the Sierra kit it list the part #'s that it replaces, and none of the part #'s that it list match the part #'s from the 59 johnson parts book?
also it seems there pivot pin seal/washer is to big or not included also wandering if that kit has the seals and bushing or just the seal I know it doesn't come with shift shaft bushing I got that one out no Problem ,but I'm afraid I will mess up the other bushing's upon removal.

The Mallory kit shows either 2 extra bushings /seals or just them separate I'm not sure The pivot pin washer/seal looks the right size, but there's a review under it that says the spaghetti seal didn't seal good. So I don't know

On the 59 Johnson parts guide it shows an O-ring that goes on the drive shaft above the water pump housing. I didn't find one on dis assembly nor do I see any on the reseal kits

So I f any one can help me out with this it would be appreciated. Which kit would be best what exactly comes in the kit (bushings & seals or just seal) Or (the extra O-ring above water pump housing) and The (different sizes to the pivot pin seal/washer)...Thanks

 

[ccvolsdhf]

Re: Thinking of trying to rebuild 18 hp Johnson

Re: Thinking of trying to rebuild 18 hp Johnson

Whew! Long day. Got some stuff done though. Here's my Lower unit seal removal help for the next guy



In these pics are all the seals that you would get in the lower unit seal kit
Drive shaft seal/bushing
Shift shaft seal/O-ring
Prop shaft seal/bushing
Oil screw seal/washers
Pivot pin seal/washer

Some kits /models have a gasket that goes under the water pump bottom plate, And for the 59 Johnson the parts guide shows an O-ring that goes on top of the water pump housing on the drive shaft.

 

[ccvolsdhf]

Re: Thinking of trying to rebuild 18 hp Johnson

Re: Thinking of trying to rebuild 18 hp Johnson

Tools



I can't imagine how long this would have taken without a seal puller $12 autozone. Beside that you just need a spade bit or home made tool a hammer and some different size flat head screwdrivers

The pic of the homemade tool and how to use the spade bit are from member asdasc

 

[ccvolsdhf]

Re: Thinking of trying to rebuild 18 hp Johnson

Re: Thinking of trying to rebuild 18 hp Johnson

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In this pic on the left is the drive shaft seal

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And here is asdasc using the seal puller

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This is mine after 20 minutes or so. Even with the puller this was no fun. Basically I had to hold on to the housing and yank up on the puller until the bushing started to break. Then took a flat head screwdriver and hammered the bushing in towards the center of the hole. Try to avoid hammering straight down as i did this and scratched the housing a little bit,I tried to get as much of the bushing as I could away from the housing wall. After knocking about 1/4 of the bushing in off the housing wall. I grabbed the puller and it popped right out

Looking at the before and after. I obviously should've put a chip of wood or something over the water pump opening to protect it from the puller. Hope this didn't mess it up?

 

[ccvolsdhf]

Re: Thinking of trying to rebuild 18 hp Johnson

Re: Thinking of trying to rebuild 18 hp Johnson

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The prop shaft seal/Bushing was worse as there is not a good way to hold it.

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Here's how i held it. still it sucked(I Bleed) lol. I couldn't get enough of a shot with the puller to start to break the bushing apart. So I started with the screwdrivers this time being careful not to hammer down just in. I couldn't get any one area to push in vary far. So I just went all the way around knocking it in little by little. Tried the puller tried hammering from the back ....Nothing. So just as I was about to quit for the night I grabbed the puller again. This time the vice grips where flipped over vertically from the picture here, so that the fattest part of the vice grips where at the top. I took the palm of my left hand and put it there on the big part of the vice grips. Gripping a board with my fingers. So I was using my palm to push down on the vice grips by gripping the board with my fingers. Then I was pulling with everything I had with the puller, finally I noticed it was moving up a little from the bottom. And 10 more minutes of grunting,and pulling out it popped

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Not much left of them

 

[ccvolsdhf]

Re: Thinking of trying to rebuild 18 hp Johnson

Re: Thinking of trying to rebuild 18 hp Johnson

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On the right is the shift shaft O-ring/bushing hole it's already been removed in the pic

You need a tool to knock out this bushing. The purpose of the tool is to first pass thru the bushing then get wider so that it will no longer fit thru the bushing. At that point tap it with a hammer,and the bushing should fall right out.
In the first pic is why a spade bit works and what you can drive it with. The point where the bushing sits on the spade bit it will no longer go up the bit's shaft. The second pic is of a homemade tool that some have made and used to do this, And the third is asdasc using the spade bit. The last is just the bushing and O-ring

 

[ccvolsdhf]

Re: Thinking of trying to rebuild 18 hp Johnson

Re: Thinking of trying to rebuild 18 hp Johnson

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Here's the bottom of the lower unit housing. It has the oil screw seals, and the pivot pin seal

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And here's a pic showing them all scraped out. A straight walk in the park after the shaft seals/bushings

 

[ccvolsdhf]

Re: Thinking of trying to rebuild 18 hp Johnson

Re: Thinking of trying to rebuild 18 hp Johnson

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And finally the lower unit housing seal( spaghetti seal) this one was easiest of all for me cause it wasn't there. If it was I would have just used a small screwdriver to scrape it out.

Hope this helps someone down the line as there are plenty here on Iboats who have already helped me

 

[HighTrim]

Re: Thinking of trying to rebuild 18 hp Johnson

Re: Thinking of trying to rebuild 18 hp Johnson

Well at least its done!

Blocks of wood to use as leverage and protection for the housings might have made things a little easier. The more you do the quicker/easier it gets, although every now and then your get it coming out in a million pieces like yours. I find it easiest to slowly pry around the circumfrence to the point just before it busts through and then keep working it around and around and somethimes the whole thing pops free. Also, some of the prop shaft seals can be driven out from the inside via 2 small holes that a small punch will fit in.

Did you use 3M 847?

 

[ccvolsdhf]

Re: Thinking of trying to rebuild 18 hp Johnson

Re: Thinking of trying to rebuild 18 hp Johnson

No I haven't put it back together yet. I I'm still having a few unknowns as to which seal kit to order.

On the Sierra kit it list the part #'s that it replaces, and none of the part #'s that it list match the part #'s from the 59 Johnson parts book?
also it seems there pivot pin seal/washer is to big or not included also wandering if that kit has the seals and bushing or just the seal I know it doesn't come with shift shaft bushing I got that one out no Problem

The Mallory kit shows either 2 extra bushings /seals or just them separate I'm not sure The pivot pin washer/seal looks the right size, but there's a review under it that says the spaghetti seal didn't seal good. So I don't know

On the 59 Johnson parts guide it shows an O-ring that goes on the drive shaft above the water pump housing. I didn't find one on dis assembly nor do I see any on the reseal kits

So I f any one can help me out with this it would be appreciated. Which kit would be best what exactly comes in the kit (bushings & seals or just seal) Or (the extra O-ring above water pump housing) and The (different sizes to the pivot pin seal/washer)...Thanks

Can I order the 3m from Iboats if so Ill get it delivered when I chose the seal kit. If not can I pick it up at local parts store's or does it have to be ordered.