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Big Boy UP4013 - screw size
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Offline cintrans  
#1 Posted : 21 July 2025 00:25:56(UTC)
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cintrans

Aruba   
Joined: 11/07/2018(UTC)
Posts: 220
Location: Aruba (general), Oranjestad
Hi

Just received my 37990 Big Boy, a display model that only once was removed from its pedestal to test drive it by the owner.
Unfortunately, doing so, the three screws / bolts that hold the lok to its wooden base were misplaced and lost...
Anyone knows what thread size and length these should be?

Regards
Jean-Pierre
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Offline rhfil  
#2 Posted : 21 July 2025 15:27:06(UTC)
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rhfil

United States   
Joined: 05/09/2014(UTC)
Posts: 692
Location: NEW HAMPSHIRE, Somersworth
Does the parts list show the screws? If it does the downloadable parts list gives the thread type, size and length. I don't see them but have no idea where they might be.
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Offline cintrans  
#3 Posted : 21 July 2025 18:41:49(UTC)
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cintrans

Aruba   
Joined: 11/07/2018(UTC)
Posts: 220
Location: Aruba (general), Oranjestad
No...
They are not mentioned in the parts list, nor the manual of the lok
Was hoping someone that has a Big Boy would be willing to remove one of them and measure it....

Regards
Jean-Pierre
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Offline Baureihe 96, DK  
#4 Posted : 21 July 2025 18:57:33(UTC)
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Baureihe 96, DK

Denmark   
Joined: 01/07/2012(UTC)
Posts: 12
Location: Sjælland
Call Marklin repair service. They can send you new screws for the Big Boy plate. I dont know the amount fot this. I have done this with other things for Big Boy ho. Things i didn`t find in the spare part list.
Bedst regards
Michael
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Offline DasBert33  
#5 Posted : 21 July 2025 18:59:47(UTC)
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DasBert33

Belgium   
Joined: 21/01/2004(UTC)
Posts: 1,279
You need 3x M3x20 screws.

But thats not all. Mine (37993) also came with 2 washers (one brass and one zinc, total thickness 1.5mm) for each screw and more importanty also a brass piece each time to put between the wooden base and the loco.

Edit: Note that the mentioned brass bushings are not identical. There are 2 which are the same and then another. Is the odd one for the tender?
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H0
Offline rhfil  
#6 Posted : 21 July 2025 20:20:35(UTC)
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rhfil

United States   
Joined: 05/09/2014(UTC)
Posts: 692
Location: NEW HAMPSHIRE, Somersworth
I have 30 years experience in hardware in the U.S. Not sure about where you are nor even sure where you are but a really good hardware store in the U.S. would have an assortment of metric screws. You could even bring the base in to try them. The length should not be critical but the thread is. Also washers are just nice to have. That would be by far the least expensive way to replace them as they sell the screws individually. Pennies. But if not you might consider buying an assortment of small metric screws which are available from Amazon.
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Offline H0  
#7 Posted : 21 July 2025 20:40:26(UTC)
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H0


Joined: 16/02/2004(UTC)
Posts: 15,469
Location: DE-NW
Originally Posted by: rhfil Go to Quoted Post
You could even bring the base in to try them. The length should not be critical but the thread is.

The thread is in the loco. If screws are too long, you cannot tighten them. They might even damage the loco if you turn too long screws too tight.
If they are too short, they may not hold the loco safely.

Without the distance rings, there will be pressure on the wheels and that can also cause damages.
Regards
Tom
---
"In all of the gauges, we particularly emphasize a high level of quality, the best possible fidelity to the prototype, and absolute precision. You will see that in all of our products." (from Märklin New Items Brochure 2015, page 1) ROFLBTCUTS
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Offline rhfil  
#8 Posted : 21 July 2025 21:00:42(UTC)
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rhfil

United States   
Joined: 05/09/2014(UTC)
Posts: 692
Location: NEW HAMPSHIRE, Somersworth
The length is not critical so slightly longer or shorter should not matter. And depending on where the flat washers are their purpose is to spread pressure. Generally they go between the head of the screw and whatever the head is in contact with. That way tightening the head does not drive it into the base. Do they go between the wheels and the base?
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Offline H0  
#9 Posted : 21 July 2025 21:32:56(UTC)
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H0


Joined: 16/02/2004(UTC)
Posts: 15,469
Location: DE-NW
The thick distance pieces go between board and loco.
You want to fix the loco to the board without putting pressure on wheels and axles.
Regards
Tom
---
"In all of the gauges, we particularly emphasize a high level of quality, the best possible fidelity to the prototype, and absolute precision. You will see that in all of our products." (from Märklin New Items Brochure 2015, page 1) ROFLBTCUTS
UserPostedImage
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Offline rhfil  
#10 Posted : 21 July 2025 23:07:29(UTC)
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rhfil

United States   
Joined: 05/09/2014(UTC)
Posts: 692
Location: NEW HAMPSHIRE, Somersworth
Plus if the screws are too long you can cut them down if you know how to do it properly or add spacer washers.
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Offline JohnjeanB  
#11 Posted : 21 July 2025 23:12:07(UTC)
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JohnjeanB

France   
Joined: 04/02/2011(UTC)
Posts: 3,587
Location: Paris, France
Originally Posted by: cintrans Go to Quoted Post
Hi

Just received my 37990 Big Boy, a display model that only once was removed from its pedestal to test drive it by the owner.
Unfortunately, doing so, the three screws / bolts that hold the lok to its wooden base were misplaced and lost...
Anyone knows what thread size and length these should be?

Regards
Jean-Pierre

Hi Jean Pierre

Honestly, I was expecting others to be quicker to spare me the extration and opening of my 37990 Big Boy. Sorry about that
So the spacers TOTAL length (not diameter) are:
- front spacer is 9.5 mm
- moddle spacer is 6.5 mm
- tender spacer is 5.5 mm

I spent quite some time to screw the loco on its wooden pedestal so here is my advice:
On a clean and horizontal surface install a cloth to prepare a bed for the UPSIDE-DOWN loco, straight
Install the washers at their proper locations
Install the screws in each 3 holes in the upside-down pedestal
Guide the screws into the spacers
Screw them, Finbished

Hint: colour-code the spacers and their location with a tiny paint markling both on each spacer and nearby where it is screwed

Note: on my loco and many others, the foam bed has lost its elasticity so the less you touch it, the better
Cheers
Jean
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