Sometimes the repair of a steam loco is necessary thus taking one apart can be cruel and unusual punishment for the uninitiated, but quickly it is realized that repairing a mini-club steam loco is achievable with a few general rules.
When I first got into collecting mini-club I remember a dealer offering repair services for all locos except for steam locos, they are too difficult was this much awarded USA Marklin dealer response. Through the course of my collecting the repair and maintenance of steam locos is part of the fun! When I use the word fun I really mean it, what better way than to quietly sit at the workbench on a Saturday afternoon taking apart a loco that does not work and bringing it back to life. The problem solving with a positive resolution is key to excitement of returning a loco to service such is the case with correct assembly of steam locos.
All of us will have a turn removing hardened oil from around the pilot wheel pivot point or wheel set gearing and even the worm gear all requiring a disassembly of the oil pan below the engine. Removing hardened oil is simply achieved but reassembling the steam loco can be the hard part for some locos including ‘mallet’ type or others with more than two pairs of driving wheels. All reassembly of bogies follows the same advice and that is to start at the front drive wheel followed by the intermediate gear followed by the next drive wheel and so forth. The pick-ups that make contact with the drive wheels can be a little tricky but keeping pressure (not too much) to each assembled wheel set in the chain works best otherwise with no pressure the pick-ups would spring outside the wheels. Add side rods to the mix and the assembly gets a little more tricky. Some side rods simply sit in a groove in the cylinder block while other designs allow them to be inserted in slots. The BR 10’s (8888, 8889, 88892, and 88893) side rods are of the latter type, the side rod sits in a groove and the shell holds it in place. Applying pressure to the side rods until the shell is in place adds a layer of complexity to this locomotive type.
Correct orientation of the wheel sets follows that all weighted sides of the wheels are aligned at the same spot to achieve this end one must turn a pair of wheel sets until it aligns. If the wheels are not lined up correctly the loco does not run properly if at all. Inexplicably in the case of the BR 10’s the wheel sets can be out of alignment and still work well on an operating loco, go figure!
photo: incorrect wheel alignment on 8889
photo: correct wheel alignment on 8889
Once the loco is taken apart it is a straight forward matter of putting it back together, it will always go back together because Marklin makes them that way. As soon as patience has left the room perhaps one should leave the project to come back to later. Always start from the front of a bogie and leave the pilot and trailing truck for last, they can be slide under the loose oil pan before screwing it together.
Note: before making any such repair organize the work bench with good light and a surface to work on, I use a foam bench made for z by www.z-hightech.de featuring a tool holder, flat area for holding parts, wedge shape section to hold a loco upside down and on angle, and a channel for securely holding the loco in place. This is the very best accessory I have found for train maintenance. I got mine on Ebay from gps_97 under the heading “GPS-5000 maintenance pad”.