TN 28 water pump impeller replacement

3DHUSKER

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Jan 19, 2019
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Do i need to drain lower unit oil or can i just unbolt and drop it? Is there a thread on this? Sorry I am a nube on this TN 28 as I acquired it from my father that passed a year ago and I am trying to get it running.
 
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3DHUSKER

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Jan 19, 2019
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There is a cable that puts it in neutral. Do you have to disconnect inside where you unbolt it to get to the WP? I currently have the cable disconnected at the top end as I have the flywheel off and replacing coils,points and capacitors. Just trying to get a plan together before i dive into the bottom end. This place has given me the confidence to do the top end. I have to research the carb also as I am sure it is a mess as this has not run in 18 years. Yikes i know could be a mess.
 

Crosbyman

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you will find all the info in the LU section of the johnson red book pages 374and up on the boat info site … just print off what you need and yes you must disconnect the neutral cable and… reinstall it properly

http://www.boatinfo.no/lib/johnson/m...nson.html#/388


btw I have one restored … waiting in the shed…. magneto is the standard magneto your coils are likely shot and the whole
mag plate needs to be service … easy as pie…. get some solid core plug wire and replace while you are it

http://www.leeroysramblings.com/johnson_magneto.htm

you may need leather seals in the primer pump and you must clean out the bottom filter screen the float may be crumbled so you need a new one

visit the POCHE family site carb and LU jobs listed

http://www.pochefamily.org/outboard/CarbService.html
http://pochefamily.org/outboard/
 
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3DHUSKER

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Sweet, Where do i get the solid plug wire? I am sure the coils are junk by the looks. I can get coils at local parts store along with tune up kit.
 

Crosbyman

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Crosbyman

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you can buy solid core plug wire on amazon but your local motorbike shop probably has some nd will sell you 4 feet

DO NOT BUY CARBON HIGH RESISTANCE WIRE FOR CARS
 

F_R

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I see lots of guys referring to "solid core plug wire". I'm sure they know what they are talking about, but it may be misleading to others. It isn't actually solid core, but is stranded metallic "wire" core. What everybody is trying to convey is that cars built in the last 60 or 70 years or so use a carbon-filled string as a core. That stuff is no good for outboards. Look for "wire" wire at lawn mower shops, tractor shops, motorcycle shops, and yes even outboard shops. Some auto parts stores stock it too, but others will give you that blank stare.
 

Crosbyman

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true… the wording is important … 7 mm wire core…. strand core… solid core all good but not CARBON wire core
 

3DHUSKER

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Jan 19, 2019
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Thank you for the information. I have a lot of work to get done in a short time as it will be time to get on the water real soon.
 

3DHUSKER

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Jan 19, 2019
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I now have spark and will pull the carb off tonight. Making headway little by little.
 

Crosbyman

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I resealed my cork float with crazy glue ( careful with fumes with eyes and lungs)
sand the cork a bit and apply 2-3 layers of liquid crazy glue or 2 layers of airplane DOPE sealer (aerogloss) or.. get a mercury float

clean the bottom plug wire mesh etc according the Poche family article

2 leather seals will be needed on the priming plunger ! mare sure you install them oriented the correct way

there is a filter on top of the fuel valve ….. you should unscrew the valve and back flush the filter


but how is compression on this oldy
 

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3DHUSKER

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Ok... I finished the carb and decided i wanted to see if it runs. This thing purred like a kitten for a while then just went sour.
Had no power and sounded like it was running on 1 cylinder. Pulled # 1 wire off and no difference. pulled #2 and it died. Put wires back on and ran it again it all of a sudden had power so I pulled #1 wire and it sounded like it did before. plugged it back in and it ran good for a bit then went to missing again. I think I have a coil that drops out and then back in. It is the only part that has not been replaced. I pulled it apart and everything else looks good. Think I may just replace both coils while i am in there again. They both tested good and look new but now I think one is suspect. What do you think?
 

3DHUSKER

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I ordered a pair... It sure sounded good when running on both cylinders.
 
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Crosbyman

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i have a nice tn27 ready to go…. in the shed all reworked with pump leather seals and all but…. water conditions presently not compatible with boating :smow:

green wire has been rerouted
 

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racerone

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Nice simple motor .-----Not even any reed valves to make noise or fail.
 
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3DHUSKER

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Jan 19, 2019
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Used 3/8, 5/16, #10 Nylon washers from lowes for the screws on the carburetor for future reference.
 

3DHUSKER

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Jan 19, 2019
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Crosbyman that looks great. I had it running in a barrel on my back patio. It was 37 out but I have to get it right so when the temp is good on a weekend I can get to the lake and make some hot laps. :)
 
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