Johnson A25

[Wetfeet]

I have an original manual for Grandpa’s A25. It says to use number 00 grease. This is a non channeling grease or slumping grease. I only knew about the number 2 grease sold everywhere. Hard to find but sold on Amazon so I bought a squeeze bottle.

Thanks for the great parts picture Tubs. It will come in handy.

Tom

[Tubs]

OO grease is available from Tractor Supply and will perform as
105 and Corn head grease. 105 and Corn head grease are an O
grease, one grade thicker. The fit of the shafts and bushings
after 80 – 90 or 100+ years determines how long you can go
before you need to add more grease. When I tried using this OO
grease it was gone rather quickly. I tend to still use my motors
and may run them for weeks at a time. The O grease “seems” to
extends the time as to when I need to remove the motor to add
more grease. That needed to be done a few tanks of gas earlier in
the picture above. Of the 3, I prefer 105. This is my experience.
Your experience will determine which lubricant is best for you.
Tubs

A "Boat House Repair" is one that done without having tools or the skills to do it properly.

[Tubs]

Something more for you to ponder.
When I did try the OO grease it seemed to remain more fluid
than an O grease as related to a water temperature in the mid
70’s. This would explained my experience as far as loss.
Video link https://youtu.be/ba7KzKjPGrg
Tubs.

A "Boat House Repair" is one that done without having tools or the skills to do it properly.

[JONATHAN C. SMITH]

Thank you for the great information.  I am ready to put the gear case back together.  Jonathan

[JONATHAN C. SMITH]

Another A25 lower unit question.  Is there any kind of o-ring or gasket that goes between the water pump housing and the lower unit?  When the water pump is seated in the lower unit housing, and the set screw is seated, there seems to be the potential for water to enter around the water pump housing where it enters the lower unit.  What is supposed to seal this area, grease?  Thanks Jonathan

[JONATHAN C. SMITH]

I posted a question about installing the water pump, but now I do not see the post, so I will ask the question again: should there be a seal, o-ring, or gasket where the water pump housing enters the gear case?  I could see where this might passively leak water into the gear case, with water passing between the gear case and the housing of the water pump, but there is only a set screw that holds the pump in the gear case, so perhaps there never was a seal in this location?  Thanks Jonathan

[stanley]

No seal or gasket under water pump

[JONATHAN C. SMITH]

A question about how the carburetor seals to the intake tube on the A 25.  Is there any gasket or o-ring, or does the carburetor simply clamp to the intake tube?  Does the carburetor need to be pushed onto the tube until it seats against the end of the tube?  Also, does anyone know who is reproducing the tiller grips for the A series Johsons?  Thanks Jonathan

[stanley]

No gasket etc. just push carb on and tighten clamp.Send me a message about grip.

[joecb]

Tubs wrote:

Many of the fasteners, like the screws for the rope pulley, are of
a thread dia. and pitch that is no longer available so be careful
with them as replacements cam be hard to come by.
Tubs.

When the subject of the unusual screw threads comes up, it’s instructional to post the ASME standard Screw chart. Take notice of sizes 12, 14 and 16 which are close in diameter to our common 1/4″ screws and all three of them came in 20 TPI pitch. Mistakenly substituting a 1/4″ for one of these can be a real problem.

Joe B

[Author]

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