146 nib removal 2 piece barrel

[MartinTenbones]

I have what I think is a 2 piece barrel.   It has been leaking around the nib and possibly at the section between the ink window as well.   I'm I correct that this is infact a two piece section.  I've attached a photo of the nib removed and the barrel. I would gently heat the area again and remove the other part for resealing as well.   As long as I'm correct here. 

 

After I clean up the threads should I use rosin to seal it back up replacing what this pink rubbish stuff is or should I be looking for a specific sealant.

 

[CS388]

If it's the model with the section sleeve which is just held in place by the collar, I had the same, with the same issue.

I ended up sealing the feed-case threads , and tweaked it all together good and snug (tight), iirc.

The ink that had been seeping from between the section and barrel  was ink that had come from the feed-case leak

and that stopped, once the f/c was fully sealed and tightened in.

Worked for years, until the section itself cracked apart and it had to go back to Hamburg.

Came back with the same nib in a modern 146 pen.

 

I'm afraid I can't remember what I used to seal the threads. It'll have been something reversible.

If you choose the pink-goo route, it is available in small quantities from ebay.

Quite a few threads on this forum, over the years, to help guide you, should you require.

Good luck

[MartinTenbones]

Well here it is apart and cleaned.   I thought that the upper sleeve was threaded also.   It had not occured to me that the threads I could see in pictures were the internal ones!    It looks like there is no sealant required for the sleeve.  Only the thread.   

 

It seems many put this back together with just silicone lubricant.  I don't want to over complicate it and I will likely do the same.   Being carful not to over tighten with the added slip from the silicone.

 

I suppose rosin might also be a suitable choice as well though.   

[Ron Z]

MB used a low shear strength silicone rubber.  I don't know if it's a two part compound or RTV silicone.  Don't use standard off the shelf RTV adhesive - it'll never come apart again. 

 

Silicone grease is not a sealant, it's a lubricant.  Many pen mechanics use the same rosin based thread sealant used on pens like Vacumatics or Sheaffer plunger fillers.

[MartinTenbones]

Thanks Ron.  I'm going to go with the rosin.    Heat it a bit apply with a tooth pick heat the section and seat the thread seems like a solid plan

[Ron Z]

I apply the rosin to the threads, and a bit below the flange on the collar, warm and screw it into place.  Just snug, not tight.  The rosin will keep it it from loosening.  Cleanup is with naphtha or lighter fluid.  Warm a bit and then clean it off.

[MartinTenbones]

Well I have it back together but I still have a leak.   I removed everything again and used more rosin and put it back together but it is still creeping. 

 

This "leak" isn't severe but every morning there is ink in these two spots.  I can clean it off but by tomorrow it will be back.  I'll attach a picture of where it is.  As I rotate the pen on the tissue the ink transfers onto it. 

 

 

I put rosin on the treads so I don't understand how ink is getting behind here at all.  I also put rosin around the flange (red arrow) and no rosin where the black cap treads meet the ink window (yellow arrow).

 

It is frustrating.... 

[JungleJim]

If you need the pink bubblegum sealant, nibmeister Kirk Speer carries it. He is located in Colorado.

 

link:   https://www.penrealm.com/product/montblanc-sealant/

 

All the Best.

[CS388]

Yes, that's right: no rosin on cap threads.

And yes, ink is definitely getting under the section sleeve, somehow.

Could it be getting in during the fill? From the bottle?

I found the section cover of this model very flimsy and it was the eventual downfall of mine.

Looks like you"re able to dismantle etc; try putting it together without the (outer) section sleeve, then filling it. (water will do).

You may be able to see where the leak is coming from? 

Maybe I just got lucky with my threads fix.

Sealed with rosin and a hair dryer, I seem to recall. (Thanks to Ron Z. for the always sage advice)

 

I've gone the pink gum route a few times, too. it's always a satisfying fix.

 

Your pen looks to be in good, solid condition-  so I'm hoping it's something simple rather than a crack etc.

I've still got the pen I mentioned earlier (well, the same nib, in a new pen) inked and on my desk right now.

Great writer!

 

Good luck

 

 

 

 

 

 

 

[MartinTenbones]

OK so with the section cover off I have no leaks which is a relief.  I guess it gets in there when filling.    I did put rosin between the nib flange and the section cover but I would have to guess it was not enough.   I think this time I'll warm it up and tighten up a bit then put the rosin on the flange so I'm sure it's in the right spot and finish tightening it.   

 

Unless there is a better technique to seal that spot.  

 

I am relived it isn't a crack I couldn't see in the barrel itself or the nib and feed plastic. 

[JCC123]

There are 3 places where you need to put the rubber sealant. I would buy the one listed on eBay. You can see where you need to put it in this thread. 

Here's where I put the pink sealant when I repaired mine. See the 3 red arrows. You don't need very much. Just enough around the circumference to prevent ink or water from going in or out from those spots.
 

[MartinTenbones]

OK I currently have it back together and it is not leaking.  I came to update the thread.    I see here you put sealant at the joint at the ink window.   I have not sealed here (currently I have sealed with rosin at the thread and at the nib to flange joint)  I do see your point though that if the pen is inserted above the cap thread in water or ink then it can get behind there

[hari317]

On 5/31/2025 at 2:07 AM, MartinTenbones said:

or should I be looking for a specific sealant.

Look for the bubble gum sealant on ebay. a seller from germany sells it.

[hari317]

On 6/12/2025 at 8:23 AM, JCC123 said:

There are 3 places where you need to put the rubber sealant. I would buy the one listed on eBay. You can see where you need to put it in this thread. 

Here's where I put the pink sealant when I repaired mine. See the 3 red arrows. You don't need very much. Just enough around the circumference to prevent ink or water from going in or out from those spots.
 

very curious about the piston mechanism in the picture. It does not look like any mechanism that i have seen on a montblanc. Pls tell more about it.

[Karmachanic]

On 5/30/2025 at 9:37 PM, MartinTenbones said:

should I be looking for a specific sealant.

 

@fountainbel uses 1:1 beeswax and liquid paraffin

 

[stric75]

Reportedly the silicone lubricant, that is often mentioned on FPN, can be used as a sealant. You just have to make sure you don't put too much of it so the feed doesn't get clogged up. It's an easier to use and also a cheaper alternative to the pink bubblegum sealant. 

[JCC123]

On 6/13/2025 at 3:09 AM, hari317 said:

very curious about the piston mechanism in the picture. It does not look like any mechanism that i have seen on a montblanc. Pls tell more about it.

The poster of that thread said that his original piston was plastic and he replaced it with brass. Nothing wrong with that if you don't care about preserving original parts.

[MartinTenbones]

I know people will use the silicone, however, with the risk of its lubrication properties leading to over tightening ect I went with what I had which was the Rosin Thread sealant.   

 

I have successfully sealed the pen back up and I am satisfied with the repair.  The pen is back in action and no longer leaving ink on my fingers.

 

 

[CS388]

9 hours ago, MartinTenbones said:

I have successfully sealed the pen back up and I am satisfied with the repair.  The pen is back in action and no longer leaving ink on my fingers.

 

Well done!

Pleased it all worked out.

Enjoy!

[MartinTenbones]

Thanks I appreciate the kind words.   It is a good feeling to have gotten this pen back into working order!