Service notebook of Harold Gordon Cornell - 1917 - Part 4

120 H.P. Beardmore 

 

Thrust is taken as a tractor from the fired steel washer

on to the front thrust ball race, to front bore steel

washer, to a flange inside thrust box, on to the

crank case.

Thrust is taken as a pusher from the f.s. washer, to

the rear thrust ball race, on to rear loose steel washer,

on to rear end of thrust box on to crank case.

[[Hand drawn diagram containing letters corresponding to descriptions]]

 

A. Crankshaft

B. Steel Flange against

C. Collar.

D. Propeller mtq

E. Distance Piece

F. Redial Ball Race

G. Ball Thrust Races.

H. Hard Steel Washers

Slack on Shaft & tight fit on

housing  I. which is held

on the propellor casement of crankouse  J.

K. Felt Washers to retain 011

[[Hand drawn diagram]]

 

Order at Firing  1, 5, 3, 6, 2, 4, 

120 H.P Beardmore      Wiring Diagram

120 H.P. Beardmore.

 

Lubrication is partly by force, splash, & grease. Force

is by the Bosch 6 way oil-pump, through internal

pipes to main bearings, cylinder walls & thrust

box. The flow of oil, can be regulated by means

of adjusting [[?]] on the top of the Bosch lubricator,

Splash is by the big ends having a scoop fitted

on the bottom half of the big end bearing which

dips into its own compartment in the sump when

rotating. Grease to all external working parts

all driving wheels, including water pump spindle, & small

grease caps for each rocking level. The sump requires

4 pints of fresh oil after the engine has been run

12 hours. After the oil has been used for this length

of time it loses its body, so is all drained out, by

removing the 6 brass plugs in the bottom of the sump.

The crank case is then thoroughly cleaned out with

paraffin & fresh oil put in, from ½ pint to 3/6 pint

being placed in each compartment. The oil can be

poured either through the breathers or by raising the can

angle lever cords.

120 H.P.  Beardmore

 

The Bosch Lubricator  The pump case is kept filled

with oil by gravity from the oil tank; the pump

spindle is driven at engine speed, but is

internally geared down to 1/25 engine speed by

means of a [[?]] & sector gearing. Two cams

are mounted on a spindle, the upper & longer cam

activating the six pump plungers, the lower & smaller

one the six valve plungers, thus giving six

deliveries of oil.

Four strokes of the pump  (1) The valve plunger is

raised by a cam (2) The pump plunger is raised drawing

oil into the pump barrel through ports via hole

in the valve plunger (3) The valve plunger is depressed

cutting off the supply of oil, & simultaneously by

means of a flat on the side of the valve plunger

opens the way from pump plunger to delivery pipe

(4) Pump plunger is depressed giving oil out of the

pump barrel via the flat to the delivery pipes.

No. 1 delivery pipe goes to No. 1 Major Bearing & Thrust Bearing

No. 2      "         "        "     "  No's 1, 2, 3 Cylinder Walls

120 H.P. Beardmore.

 

(Bosch Lubricator)

No. 3. Delivery Pipe to 4,5,6  Cylinder Walls

No. 4.    "            "      "    6 & 7 Main Bearings.

No. 5.     "            "     "   2 & 3     "          "

No. 6.      "            "     "   4 & 5     "          "

The adjustment  of the oil supply to 3½ pints per hour;

Screw all the adjusting screws down in a clockwise 

direction as far as possible. Then screw back Nos. 1, 4, 5, 6,

2½ turns and lock. Nos  2 & 3, one turn & lock. The

oil used both in summer & winter is [[Vacuum?]] B.B.

The oil pump gives 48 pulsations of oil per minute at 120°

r.p.m. of the engine.

Gearing of Magnetos. Two running magnetos are fitted at

propeller end of engine & are driven direct off the cam-shaft.

The magneto armature revolves three times to cam-shafts one

& the crankshafts two revs. The type of magneto used is the

Bosch D V 6 which gives two spurts per rev of armature 

each magneto supplying the six cylinders. There is also a

C.A.V. self starting magneto fitted near the pilots seat and is

used for starting up purposes only.

Bosch Lubricator

 

[[Hand drawn detailed diagram]]

- 120 H.P.  Beardmore. 

Wiring of C.A.V. Self Starting Magneto

Connect with H.T. wire. the large terminal on the C.A.V. to

central terminal on R.H. Magneto & connect small terminal

on the C.A.V. to the switch & from switch to earth, 

To Start Engine:-

See that all switches off, turn petrol on with throttle ¼ open,

ignition lever retarded & main air intake ports closed; then

turn propeller round several revs, to suck a good

mixture into the cylinders, always leaving the propeller

just over the compressor stroke, then after being given

all clear, switch on all magnetos, & turn small handle

on C.A.V. until engine is started; after engine is started

switch off C.A.V. & run the engine at about 600 revs

per minute until engine is warmed up.

Carburetters. There are 2 carburetters, which are Beardmore

design & [[?jacketed]], each one supplying 3 cylinders. They are

each made with a single fit, the control being by means

of a rotary sleeve which is so designed to keep a ratio

of petrol & air constant at all speeds of the engine .

[[Detailed Hand Drawn Diagram]]

 

- 120 H.P. Beardmore -

 

Tracing petrol into Engine. The petrol is forced by

pressure from the main tank into the filter up the

middle valve into the circular float chamber. The

float rises against balance weights & cuts off the supply

when the petrol reaches its proper level. Petrol is

drawn out of the jet & also air from the main air inlet

by suction from the engine & is drawn through the

choke tube into the mixing chamber where it mixes

with the extra air from the extra air inlet & is

quickly vaporised by the help of hot water round the

gaskets, from here it is controlled by the rotary sleeve

and passes out in the form of a vapour through the

induction pipes & inlet valves into the cylinders 

Strength of Leaf Spring  46 lbs each side

Rev Counter driven by shaft through top of lubrication case.

Bombs

 

Fuse, Bomb, D.A. No. 1   MK   I  (Nose Fuse for 112 lb

HERL  Bomb MK III )

On release from the carrier the safety collar is withdrawn

allowing the vane to rotate, which during

40ft. of fall screws up until the strike on just off

the detonator. On impact; there is a pressure exerted

on the pressure plate, which shears two copper joins,

allowing the 'striker' to fire the detonator. This in

turn fires a small charge of C.E. (Corporation Englemore)

which blows out the end caps of the fuse & fires

the main charge.

Safety Devices  (1) Transit pin   (2) Safety Collar

(3) Red, safety setting line.

(4) Copper Shearing Pins.

Pistol Tail, for H.F.R.L. Bomb 

On release from the carrier the safety clip is

withdrawn allowing the vane to rotate, which during

40ft. of fall screws off allowing the sticker & nut to fall on 

to a weak spiral spring which holds it off a detonator

On impact, the striker & nut are shot down, compress the