Cylinders and Valve Gear
Pair of original Silvertown lubricators.
Cylinders and Valve Gear
The two outside cylinders are 19.5 in. diameter and 28 in. stroke, and are steel castings with cast iron liners, both in the barrel and valve chest. The 11 in. diameter valves have a steam lap of 1.68 in. and lead of 0.25 in. and are operated by valve gear of the conventional Walschaerts type, giving a travel in full gear of 7.75in. and full gear cut-off of 78%.
The slidebars are of the three bar type with underhung crosshead.
The piston head incorporates a bronze spring-loaded slipper which carries the head clear of the cylinder barrel liner.
Valve and cylinder lubrication is by atomised oil delivered by mechanical lubricators.
Lubrication of motion pins is by a soft grease, nipples for the reversing shafts and expansion link being grouped together on the motion bracket. The eccentric rod big end runs on a 'Skefko' self-aligning ball bearing.
Steam operated cylinder cocks of large diameter are fitted for quick draining of the cylinders of water which may accumulate.
Reversing is by handwheel and screw, the latter being situated at the reversing shaft lever, and rotated by a tubular shaft from the cab. A drum type cut-off indicator is provided and the operating wheel is placed parallel to the longitudinal centre line of the engine.
The coupled wheels are 6 ft. 2 in. diameter on the tread, the tyres being shrunk on and secured by two small lips, one each side of the wheel centre, there being no separate securing ring, studs or rivets. Built up weights in the wheels balance the revolving and 40% of the reciprocating weight.
Held in Store
- Silvertown Lubricators, working
- Return crank (eccentric rod) ball bearing races, new
- Return crank covers, washers, leather seals, ready to fit
- Reverser shaft and universal joints, ready to fit
- Incomplete set of original valve slide bars
- Cylinder drain cock castings
- Atomisers, machined ready to fit
- Front cylinder cover castings, require machining.
Patterns Held
- None
Wish List
- Valve slides to complete compliment
- Money to order cylinders - quote 50k - patterns, casting, machining delivered ready to fit.
- Cut-off indicator (reverser) - same as 9F, Class 7 and Class 5
How You Can Help Build 'Hengist'
You can make a donation, you can sponsor a part or you can become an active member, for more details email: info@72010-hengist.org or write to the chairman.