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Life steam stationary - Märklin 4089/92/8 steam engine

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steamfriend		#1 Posted : 07 December 2023 00:33:55(UTC) Retweet
Joined: 19/11/2002(UTC) Posts: 378 Location: Leuven, Belgiium		Hi all, I was wondering if there are any life steam addicts in here that are enhousiastic about the Märklin production of stationary steam engines. Particularly, I am looking for more technical information, e.g. as to the threads M used in the 30’s - 50’s. They uses, apparently, 40 turns per inch threads, but do not math BSW nor UNF 6 diameters... OK, maybe I’m becoming too detailed technically, but my question is: is there anybody passionate about these marvellous machines? Thanks, Bob

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kimballthurlow		#2 Posted : 07 December 2023 05:29:31(UTC) Retweet
Joined: 18/03/2007(UTC) Posts: 6,669 Location: Brisbane, Australia		Hi Bob, 40 tpi is a typical model engineering thread used world-wide. Example - in live steam engines for any gauge up to 12 or 15 inches, it is used for olive/nut/flange pipe fittings and can be applied to any spanner size that suits. Take a look at Reeves of near Birmingham https://www.ajreeves.com/6525.html Descriptions like this abound - BLOWER VALVE 1/4" x 40 where 1/4" is the stud or bolt diameter and 40 is the thread pitch. Also I wonder if it might be one of those weird hybrid fastenings that proliferated at that time. Example - you could get British Association (BA) fasteners with metric threads and standard BSW hex bolt heads. Example - BA 4 and BA 5 are marginally either side of 40 threads per inch. I purchased a British 1948 model MG sports car, and it was completely BSF (British Standard Fine) bolt heads with metric threads. I cant remember the pitch, the bolts were probably manufactured in Germany. Kimball Edited by user 08 December 2023 02:22:12(UTC) \| Reason: Corrected dimensional description
		HO Scale - Märklin (ep II-III and VI, C Track, digital) - 2 rail HO (Queensland Australia, UK, USA) - 3 rail OO (English Hornby Dublo) - old clockwork O gauge - Live Steam 90mm (3.1/2 inch) gauge.
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EMD_GP7		#3 Posted : 07 December 2023 14:45:41(UTC) Retweet
Joined: 23/11/2010(UTC) Posts: 192 Location: U.K. Midlands		The 1/4 inch dimension is the outside diameter of the thread NOT the spanner flat size which depends on the application, Bolt head, Nut , Pipe nut Etc. I have a valve similar to the Reeves valve on my 5" gauge loco where the Lock nut and the pipe nuts are different sizes although both are 1/4" x 40 TPI ( bought from Reeves who are now 35 miles from Birmingham in Leicestershire _ I cycle past there regularly ) Colin

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steamfriend		#4 Posted : 07 December 2023 18:29:21(UTC) Retweet
Joined: 19/11/2002(UTC) Posts: 378 Location: Leuven, Belgiium		Thanks a lot for your comments and thoughts, guys. What I really wanted to know is where one can find those Märklin nuts, with internal thread of 40 TPI. I tried both BSW1/8 and UNF Nr6, both with 40TPI internal gauge, but none of the fit the diameter of the bolt (is true for the valve shown below, but also for the fixing screws in the machine). Another question is how to dismantle the water level inspection glass safely. It is tightly fixed apparently... cannot move it out. Bob

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cookee_nz		#5 Posted : 07 December 2023 22:29:28(UTC) Retweet
Joined: 31/12/2010(UTC) Posts: 3,955 Location: Paremata, Wellington		I have a couple of Engines, but I would not say I was passionate about them. Possibly more of a passing fancy than anything. I've got the 16051 reproduction and an original smaller one 4097 from c. 1930. Whether they will endure long-term in my collection is yet to be decided. I can't answer your specific question but in the back of an old catalogue (1939) some parts for the Dampfmaschine were listed that might be of interest for reference
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kimballthurlow		#6 Posted : 08 December 2023 02:25:13(UTC) Retweet
Joined: 18/03/2007(UTC) Posts: 6,669 Location: Brisbane, Australia		Originally Posted by: EMD_GP7 The 1/4 inch dimension is the outside diameter of the thread NOT the spanner flat size which depends on the application, Bolt head, Nut , Pipe nut Etc. I have a valve similar to the Reeves valve on my 5" gauge loco where the Lock nut and the pipe nuts are different sizes although both are 1/4" x 40 TPI ( bought from Reeves who are now 35 miles from Birmingham in Leicestershire _ I cycle past there regularly ) Colin Hi Colin Thank you so much for your correction. I have edited the text in my post. Regards Kimball
		HO Scale - Märklin (ep II-III and VI, C Track, digital) - 2 rail HO (Queensland Australia, UK, USA) - 3 rail OO (English Hornby Dublo) - old clockwork O gauge - Live Steam 90mm (3.1/2 inch) gauge.
		WWW

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