Topic: 1940 Johnson DT-10 driveline broke? – Antique Outboard Motor Club,Inc

This topic has 25 replies, 4 voices, and was last updated 4 years, 5 months ago by wanderlustjake.

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May 5, 2021 at 9:46 pm #237820
wanderlustjake
Participant
Greetings,

I just picked up a 1940 Johnson DT-10 from a friend. It all seems to be there. I am new to the hobby so please forgive my rookie questions.
The recoil start is off the motor in a box in pieces. Does anyone have a diagram of how it should be assembled? Or can you point me to a manual please?
Second, are these direct drive or do they have a neutral? Reason I ask is when spinning the motor by hand, the prop doesn’t turn, but if I spin the prop, it will act like it is engaged. I have messed with the thing all of 5 minutes so I could be missing something…
Thank you in advance,
Jason in Michigan.
- This topic was modified 4 years, 6 months ago by wanderlustjake.
May 6, 2021 at 5:38 am #237823
eltoquad
Participant
US Member
It is a direct drive.
May 6, 2021 at 6:19 am #237824
wanderlustjake
Participant
Thank you for verifying. Will try and mess with it more later today.
May 6, 2021 at 8:24 am #237830
Buccaneer
Participant
US Member
Here’s a photo of my gear case all torn apart. Maybe your shear pin
is just sheared.
My is missing the rewind, hence I have no photos of it.

Prepare to be boarded!
May 6, 2021 at 8:16 pm #237880
wanderlustjake
Participant
Pulled the prop, shear pin is good. Spinning flywheel I can spin as much as I want. If I grab the prop I can spin 1/4 – 1/2 turn, can kind of feel gears then it’s a hard stop. Sounds like I can hear drive shaft spinning in housing below the powerhead when manipulatingbthe prop.
I forgot. Friend I bought it from said he thought it had seized, pulled the recoil off and it seemed fine. Not sure what the heck happened.
May 6, 2021 at 9:45 pm #237886
Buccaneer
Participant
US Member
It should only take a few minute to pull things apart and have a look in the gear case.

Prepare to be boarded!
May 7, 2021 at 6:43 am #237895
wanderlustjake
Participant
I’ve never pulled one of these apart. Is there anything I should be extra cautious with? I found an online link to a 1939 manual (of sorts). I need to sit down and go through it. Seems a little vague at first glance. Is there anything out there with a more thorough explanation?
May 7, 2021 at 8:41 am #237896
Buccaneer
Participant
US Member
From what I remember, remove the exhaust snout above the prop,
disconnect the bolts and water line on the water pump, remove
the gear case cap bolts.
The water pump has a spring loaded piston inside, and a couple of
“check balls”, so make sure nothing flies or rolls away when you take
it apart.

P.S.- It never hurts to take photos as you take it apart, so you’ll have
reference on how it goes back together!

Prepare to be boarded!
- This reply was modified 4 years, 6 months ago by Buccaneer.
May 7, 2021 at 1:49 pm #237925
wanderlustjake
Participant
Thank you Buccaneer, I’ll have at it.
May 17, 2021 at 8:28 pm #238516
wanderlustjake
Participant
Found it! Driveshaft snapped just above the pinion gear. Why who knows? Powerhead still wouldn’t spin with pinion gear out, pulled powerhead, it spins fine now.
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