Zinc Pest (Mazak Rot); The Affected Models List

[34theletterbetweenB&D]

26 minutes ago, Mark Saunders said:

...I suspect the same poor quality was a problem in the Uk at the beginning of the industrial revolution!

But then it was largely down to lack of knowledge. In that position failure is the teacher.

[Manston]

14 hours ago, sandwich station said:

 

This is what Mazak rot looks like. Funny enough this is the front bogie off of 34070 Manston. :) 

it’s not mould or a surface covering and it didn’t brush off. The paintwork has come off exposing metal underneath, looks similar to the bogie in the above picture.  Such a shame as it’s a cracking model and Bachman spares don’t have a spare body. I’ll photograph it and monitor it to see if spreads. Now to check Manston that’s in a display case in the house…
 

Big thanks to everyone who’s responded.

[melmerby]

1 hour ago, Manston said:

it’s not mould or a surface covering and it didn’t brush off.

Did you use a stiff brush e.g. a fibreglass bristle brush?

An ordinary soft brush wont work.

It still looks like surface corrosion to me and that would lift the paint.

[sandwich station]

7 hours ago, Manston said:

it’s not mould or a surface covering and it didn’t brush off. The paintwork has come off exposing metal underneath, looks similar to the bogie in the above picture.  Such a shame as it’s a cracking model and Bachman spares don’t have a spare body. I’ll photograph it and monitor it to see if spreads. Now to check Manston that’s in a display case in the house…
 

Big thanks to everyone who’s responded.

 

As Dunsignalling says, this bogie is from the limited edition Manston (R.2260), dating from the end of 2002 (only 500 produced). I also had Merchant Navy Port Line with the same problem. There are other Bulleid pacifics of that period with the same issue. I was lucky enough to have 2 replacements sent to me by Simon Kohler a few years ago.

[melmerby]

8 hours ago, sandwich station said:

As Dunsignalling says, this bogie is from the limited edition Manston (R.2260),

Which is not the item in question which is a Bachmann C class

[sandwich station]

18 hours ago, melmerby said:

Which is not the item in question which is a Bachmann C class

 

But the pictures I posted to show him what mazak rot looks like is. grumpy.

[adb968008]

On 14/08/2023 at 21:48, Manston said:

it’s not mould or a surface covering and it didn’t brush off. The paintwork has come off exposing metal underneath, looks similar to the bogie in the above picture.  Such a shame as it’s a cracking model and Bachman spares don’t have a spare body. I’ll photograph it and monitor it to see if spreads. Now to check Manston that’s in a display case in the house…
 

Big thanks to everyone who’s responded.

Could you show a photograph afterwards, as this would be a new one to add to the list ?

[leopardml2341]

 

 

 

 

Yet another reminder!

 

Please post only details of affected models in the format requested in post #1.

 

 All posts not of this type will be hidden.

Edited August 17, 2023 by leopardml2341

[Manston]

On 16/08/2023 at 08:41, adb968008 said:

Could you show a photograph afterwards, as this would be a new one to add to the list ?

Yes will do when back from hols

[Manston]

On 16/08/2023 at 08:41, adb968008 said:

Could you show a photograph afterwards, as this would be a new one to add to the list ?

Picture taken post fibreglass bristle brush. Takes the paint off back to the metal. Perhaps it’s not the rot then.

[melmerby]

That does look hopefully like surface oxidation/corrosion, possibly due to condensation inside the packaging.

If so, shouldn't be a problem. A good clean and some new paint should do the job.

 

The ones I have had with rot look very different as it's the internal structure of the metal that changes, causing crystalisation and expansion.

Eventually they just break apart without much/any help.

 

[Kris]

Another failed Hornby MN - United States lines. Front bogie suffering. 

 

[sandwich station]

15 hours ago, Kris said:

Another failed Hornby MN - United States lines. Front bogie suffering. 

 

From the same period as all the other failed spam can pacifics.

[what_the_wasabi]

Hornby Class 08 Shunter from R2669 set

 

[cypherman]

Hi all,

Not a loco, But 3 Triang short wheel based wagon chassis. Rotting round the buffers and buffer beam. Only seen mazak rot once before in a Triang product. That was a 3mt 2-6-2 chassis that had virtually disintegrated. 

 

[kernowtim]

Another model that is long out of warranty is this early postwar  Hornby Dublo LNER A4, with the chassis expanding and  breaking up!

[sandwich station]

On 20/10/2023 at 09:20, cypherman said:

Hi all,

Not a loco, But 3 Triang short wheel based wagon chassis. Rotting round the buffers and buffer beam. Only seen mazak rot once before in a Triang product. That was a 3mt 2-6-2 chassis that had virtually disintegrated. 

 

 

Got any pics of the wagons cypherman?

[cypherman]

9 hours ago, sandwich station said:

 

Got any pics of the wagons cypherman?

Hi sandwich,

Sorry no. I binned them in a fit of annoyance and did not think to take any pictures and post the pictures before it was too late.

I was wondering though in the older Hornby Dublo and early Triang ones how close to the end of WW2 they were made. As the state of the economy and general buggered upness of the wold at that time. Did they have to use what ever they could get their hands on to make the mazak chassis. Which once the world had settled down and trade and the economy had picked up were able to get a better quality alloys?. Just a thought.

Edited October 21, 2023 by cypherman

[Fair Oak Junction]

Does anyone know if any of the Hornby T9s were not affected by the rot? (i.e. any specific R number)

I've heard some people say the one in the Imperial Airways pack wasn't, but it all gets a bit confusing and there seems to be a lot of conflicting info.

[Dunsignalling]

1 hour ago, Obsidian Quarry said:

Does anyone know if any of the Hornby T9s were not affected by the rot? (i.e. any specific R number)

I've heard some people say the one in the Imperial Airways pack wasn't, but it all gets a bit confusing and there seems to be a lot of conflicting info.

The latest version of 120 in LSWR green is claimed to be OK, but I'd think it's probably too early to be certain.

 

I have the older (NRM) one and four different BR examples that have all succumbed. However, there might be random examples of all or any that received uncorrupted motor mounts by sheer chance.

 

Don't buy any T9 you haven't seen run perfectly would be my advice. 

 

John

[33C]

2 hours ago, Dunsignalling said:

The latest version of 120 in LSWR green is claimed to be OK, but I'd think it's probably too early to be certain.

 

I have the older (NRM) one and four different BR examples that have all succumbed. However, there might be random examples of all or any that received uncorrupted motor mounts by sheer chance.

 

Don't buy any T9 you haven't seen run perfectly would be my advice. 

 

John

My neighbour has a black T9 full of it. But, I injected superglue in all the cracks as a " nothing ventured, nothing gained " idea and it's still running okay...

[Dunsignalling]

3 minutes ago, 33C said:

My neighbour has a black T9 full of it. But, I injected superglue in all the cracks as a " nothing ventured, nothing gained " idea and it's still running okay...

The first T9 I tackled was for a friend before any of mine failed. I made a new mount by laminating plasticard and superglued the motor to it. Still running fine four years on.

 

Since then I've used the brass castings from Peter's Spares and bought enough to do all of mine in anticipation. The Hornby spare was unavailable at the time, and I'm not sure I'd trust it to be better than the original part anyway. 

 

The mounts in those I've so far repaired had substantially turned to dust, and half of what was left remained with the body when I removed it! I haven't yet gone inside the rest, and they may not be so extreme, but they no longer run well and there's similar dust in their boxes.

 

[Fair Oak Junction]

It's such a shame Hornby have seemingly washed their hands of the T9s. Considering how many fell to the rot, you'd assume a market is still there for new ones. They don't even really need to touch the tooling, just made them out of better (and longer lasting) materials. But I'm sure they have their reasons.

[RodneyS]

A friend has the Imperial Airways pack and the T9 in that had Mazak rot.

It was repaired with the Peter's Spares castings.

Rodney

[33C]

Don't forget the "universal motor mount"!

 

Hot glue gun....