CMS Chiltern Mill Twin Cylinder Assembly Instructions Manual

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Chiltern Model Steam Engines

Mill Twin Cylinder Model Steam Engine v2 Assembly Instructions v1.1

Notes:

In overview the engine should first be assembled "dry" with no oil/lubricants, thread lock or

gasket sealant applied, then disassembled, polished, painted as required, and finally re-

assembled lubricating and applying thread lock and gasket sealant as applicable.

The engine will work properly "dry" but if it is to be run under load, it is recommended that

thread lock, such as Loctite 222 Screwlock (or equivalent low strength locking compound) be

used to stop the fasteners from coming loose. Also that a gasket sealant, such as Loctite

Instant Gasket (or equivalent), is used on the cylinder's mating surfaces with the end plates

and Chest. Both thread lock and gasket sealant can be purchased for a small sum from

automotive shops or on the internet.

Although all sharp edges and burrs should have been removed during manufacturing, check

all parts and if any sharp edges or burrs exist carefully remove them with a metal file.

It is recommended that the base castings are painted. Hammerite's range of metal paint

sprays work well for this application although do take a long time to dry between coats, up

to a week before the engine can finally be assembled. Use masking tape to cover the mating

surfaces or scrape off the paint as needed afterwards.

For polishing the brass components, wet and dry paper can be used - start with coarse e.g.

280 grade to get the worst marks out of the brass work and end with very fine paper, e.g.

1500 grade and finally Brasso and a rag.

Be careful not to over tighten or cross thread the capscrews, use only a small and/or

medium screw driver. If excessive force is being used there is probably something out of

alignment.

Always check

www.chilternmodesteam.co.uk

and tips. Any questions or comments good or bad, please don't hesitate to contact us via

email: sales@chilternmodelsteam.co.uk.

We would be grateful if you would take some pictures of your completed model and email

them to us for inclusion on our WEB site.

Tools required for assembly depend on which screws have been supplied with the kit but

can include; M2 (4mm) and M3 (5.5mm) open ended spanners, 2.5mm (preferable long)

Hex/Allen Key, 1.5mm Allen/Hex Key, medium slot screw driver, metal file and small pliers,

metal hack saw.

10.

NOTE: some of the screws as provided in the kit may need to the cut or filed to length,

please contact us if this presents a problem and we will work on a solution.

for the latest assembly drawing, instructions

Page 1.

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Summary of Contents for CMS Chiltern Mill Twin Cylinder

Page 1 Chiltern Model Steam Engines Mill Twin Cylinder Model Steam Engine v2 Assembly Instructions v1.1 Notes: In overview the engine should first be assembled "dry" with no oil/lubricants, thread lock or gasket sealant applied, then disassembled, polished, painted as required, and finally re- assembled lubricating and applying thread lock and gasket sealant as applicable.
Page 2 Mill Twin Cylinder Model Steam Engine v2 – Assembly Instructions v1.1 Step by step instructions: Locate the parts as show in the following picture and as listed on the A3 Assembly Drawing (a copy of which will have been included with the kit but also available for download from www.chilternmodesteam.co.uk).
Page 3 Mill Twin Cylinder Model Steam Engine v2 – Assembly Instructions v1.1 The 2 brass Tube Sliders should already be installed on the stainless 2 Connecting Rods using Slider Pins. If not carefully press in the Slider Pins using a small vice. There is an interference press fit between the Tube Slider and the Slider Pin and a free fit between the Slider Pin and the Connecting Rod.
Page 4 Mill Twin Cylinder Model Steam Engine v2 – Assembly Instructions v1.1 Place the Crank Shaft onto the Main Bearing Lowers and replace the Uppers, as shown in the following picture. Evenly and gradually tighten the 6 cap screws whilst rotating the shaft. This will ensure the bearings centre themselves properly on the shaft.
Page 5 Mill Twin Cylinder Model Steam Engine v2 – Assembly Instructions v1.1 Screw the Packing Nuts into the Cylinder Plate Inners. If it is planned to use high pressure steam - during final assembly, to improve the seal around the piston shaft, PTFE tape can be wrapped around the shaft and Packing Nut thread.
Page 6 Mill Twin Cylinder Model Steam Engine v2 – Assembly Instructions v1.1 Place a Cylinders onto the Cylinder Plate Inner and Piston and place the Cylinder Plate End on top of that. Align the holes in the Cylinder Plates and Cylinders with the threaded holes in the Base and screw in the M3 45mm cap screws as shown in the following picture.
Page 7 Mill Twin Cylinder Model Steam Engine v2 – Assembly Instructions v1.1 Connect the Valves with the Eccentric Rods using M2 10mm cap screws and lock each with a nut as shown in the following picture. Push the 2 Eccentric Wheels on to the 2 ends of Crank Shaft, don’t tighten the grub/setscrews yet.
Page 8 Mill Twin Cylinder Model Steam Engine v2 – Assembly Instructions v1.1 Valve timing is set with the angle of each Eccentric Wheel to the Crank/Piston position as shown in the following pictures. Get the respective positions correct and then tighten the grub/setscrew.
Page 9 Mill Twin Cylinder Model Steam Engine v2 – Assembly Instructions v1.1 Screw the 2 Value Inlet Pipes into the remaining holes in the Chests (these stub pipe is used for connecting to an air source). The threaded holes in the chest are ¼” x 40 tpi ME which will accommodate the most common connection to a model steam boiler.
Page 10 Mill Twin Cylinder Model Steam Engine v2 – Assembly Instructions v1.1 Place 2 cap screws in each of the remaining 2 Manifolds, as per the following picture. Screw the Tee Connector to the Elbow Connector using the Link Pipe. Keeping the cap screws in place screw the 2 Manifolds into the Tee and Elbow Connectors respectively.
Page 11 Mill Twin Cylinder Model Steam Engine v2 – Assembly Instructions v1.1 For connecting to an air soruce the Inlet Pipe can be screwed into the tee. NOTE: The tee can be reoriented to allow an horizontal inlet direction rather than top/vertical as show in the above photo and as mentioned earlier the manifold can be installed on the bottom of the Chest/engine with Chest Plugs on the top.
Page 12 Mill Twin Cylinder Model Steam Engine v2 – Assembly Instructions v1.1 Please send some pictures of the completed engine to email: sales@chilternmodelsteam.co.uk. Copyright - Chiltern Model Steam Engines Page 12.