Crankshaft

Moto Rumi technical problems or solutions
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Elie
Posts: 31
Joined: Mon Jul 01, 2019 11:02 pm

Crankshaft

Post by Elie » Tue Jul 02, 2019 12:06 pm

Hello, I am a new member, I am working on the complete restoration of a Rumi 125 from 1953. I am now ready to dismantle the engine, have a question about this. To replace the seals and the middle bearing the crankshaft must be separated, can I just press the parts?, Is there someone that can give me good advice?, Thank you :D

hugomez
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Re: Crankshaft

Post by hugomez » Tue Jul 02, 2019 2:38 pm

Hi Elie,

Welcome to Moto Rumi Forum. It would be nice if you pass by the section "New Members, welcome here" and introduce yourself, telling us a bit about you (Where are you from, interest for the brand, etc). Always photos of your Rumi are more than welcome as well :D

About your question. Funny enough, I was talking just a few days ago with another member of the forum, about adding to the forum a tutorial about how to dismantle a crankshaft, replacing the bearings, seals and rods, and assemble all again, providing the correct clearances and tips about what to check to see if the parts are still useable or not.

I've personally never dismantle a crankshaft myself, but is something I would really like to learn, so hopefully somebody with the knowledges will reply your question adding as many details as possible, that eventually will be useful to everybody else in the forum.

Greets,
Hugo

Moto-Rumi-Crankshaft-diagram.jpg
Moto-Rumi-Crankshaft-diagram.jpg (45.01 KiB) Viewed 1038 times
My little Formichino here: http://www.formichino.com/pictures1.html

Elie
Posts: 31
Joined: Mon Jul 01, 2019 11:02 pm

Re: Crankshaft

Post by Elie » Tue Jul 02, 2019 9:48 pm

Now to post pic thanks

hugomez
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Re: Crankshaft

Post by hugomez » Tue Jul 02, 2019 9:55 pm

Hi Elie,

On the next link you can download the complete parts catalog of the Rumi Sport 1952-53:
LINK: viewtopic.php?f=23&t=556

In this other link you can download the Rumi Sport Owner manual:
LINK: viewtopic.php?f=23&t=702

I hope this is helpful during your restoration.

Greetings,
Hugo
My little Formichino here: http://www.formichino.com/pictures1.html

Elie
Posts: 31
Joined: Mon Jul 01, 2019 11:02 pm

Re: Crankshaft

Post by Elie » Tue Jul 02, 2019 10:09 pm

Thank you very much.
How do i post pic?

hugomez
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Re: Crankshaft

Post by hugomez » Tue Jul 02, 2019 10:22 pm

Elie wrote:
Tue Jul 02, 2019 10:09 pm
Thank you very much. How do i post pic?
1 - Reduce the size of the photo in your computer to a maximum of 750px wide.
2 - Click at "Post Reply"
3 - Click at "Attachments"
4 - Click at "Add files"
5 - Select the photo from your computer
6 - Click "Submit"

Attachment-image__.jpg
Attachment-image__.jpg (15.91 KiB) Viewed 1013 times
My little Formichino here: http://www.formichino.com/pictures1.html

Elie
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Joined: Mon Jul 01, 2019 11:02 pm

Re: Crankshaft

Post by Elie » Tue Jul 02, 2019 10:46 pm

Thanks for the info. That is my problem, the photos are too large, find a way to reduce them.

hugomez
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Re: Crankshaft

Post by hugomez » Tue Jul 02, 2019 11:01 pm

Elie wrote:
Tue Jul 02, 2019 10:46 pm
Thanks for the info. That is my problem, the photos are too large, find a way to reduce them.
In your computer you must have programs to reduce the photo, but in case you don't, there are free online websites where you can also do it.

For example:
https://www.reduceimages.com/
https://resizeimage.net/
And many more.
My little Formichino here: http://www.formichino.com/pictures1.html

Elie
Posts: 31
Joined: Mon Jul 01, 2019 11:02 pm

Re: Crankshaft

Post by Elie » Wed Jul 03, 2019 1:13 pm

Thanks, I will try :D

Elie
Posts: 31
Joined: Mon Jul 01, 2019 11:02 pm

Rumi

Post by Elie » Tue Jul 16, 2019 10:51 pm

Attachments
27C202D1-3380-4FFA-B5F3-81B10B7EE2A7.jpeg
My rumi now
27C202D1-3380-4FFA-B5F3-81B10B7EE2A7.jpeg (61.07 KiB) Viewed 864 times

Elie
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Joined: Mon Jul 01, 2019 11:02 pm

Re: Crankshaft

Post by Elie » Tue Jul 16, 2019 10:53 pm

Attachments
5F4A13A0-FB6B-4482-A470-FBE0668C6672.jpeg
5F4A13A0-FB6B-4482-A470-FBE0668C6672.jpeg (96.3 KiB) Viewed 863 times

hugomez
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Re: Crankshaft

Post by hugomez » Wed Jul 17, 2019 8:21 am

Thanks for sharing the photos of your project.

Is it complete?, did you get the bike in parts or assembled?
My little Formichino here: http://www.formichino.com/pictures1.html

Elie
Posts: 31
Joined: Mon Jul 01, 2019 11:02 pm

Re: Crankshaft

Post by Elie » Wed Jul 17, 2019 6:57 pm

hello got the moto complete and completely disassembled, sandblasted, engine is overhauled with 40 bore with new pistons chrome is redone, repainted, and engine block polished much work :D

hugomez
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Re: Crankshaft

Post by hugomez » Wed Jul 17, 2019 10:43 pm

Elie wrote:
Wed Jul 17, 2019 6:57 pm
hello got the moto complete and completely disassembled, sandblasted, engine is overhauled with 40 bore with new pistons chrome is redone, repainted, and engine block polished much work :D
Wow!!, you have most of the job done, congratulation. Basically is the assembling part the next step.

Keep us update!!!

Greets,
Hugo
My little Formichino here: http://www.formichino.com/pictures1.html

Elie
Posts: 31
Joined: Mon Jul 01, 2019 11:02 pm

Re: Crankshaft

Post by Elie » Wed Jul 24, 2019 2:40 pm

crankshaft disposed of by specialized firm, is not yet easy to balance and replace bearings

Elie
Posts: 31
Joined: Mon Jul 01, 2019 11:02 pm

Re: Crankshaft

Post by Elie » Sat Oct 19, 2019 11:04 pm

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Elie
Posts: 31
Joined: Mon Jul 01, 2019 11:02 pm

Re: Crankshaft

Post by Elie » Sat Oct 19, 2019 11:08 pm

start building the engine almost all parts have arrived

hugomez
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Re: Crankshaft

Post by hugomez » Sun Oct 20, 2019 6:53 am

Congratulation Elie for the progress on this engine.

Are you going to assemble the cylinders before closing the halves?

You mentioned in the past that you have been mechanic all your life, so you know what you are doing, I don't have the experience and knowledges to question it.

In my case I always join/close the crankcase halves first, adding the joining compound and the Loctite at the bearings. Once that is nicely closed and attached, I carry on the assembly of the cylinders.
My little Formichino here: http://www.formichino.com/pictures1.html

Elie
Posts: 31
Joined: Mon Jul 01, 2019 11:02 pm

Re: Crankshaft

Post by Elie » Mon Oct 21, 2019 10:34 pm

Yes your method is good, did this because it is easier to assemble the pistons without the top part, I will place the cylinder for the time being to protect pistons in later works, disassemble them back but small work, Greetings

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