A.J.S. 18S Bedienerhandbuch

MAINTENANCEMANUALINSTRUCTIONBOOKANDfor1951350c.c.and 500c.c.A•JSPRING FRAME AND RIGID SINGLE CILINDER MODELS PRICE 2/6 NETTA J•SM O T O R C Y C L E SP

CONTROLS (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (II) (12) (13) (14) (15) (16) (17) Throttle twist grip. On right handlebar. Twist inwards to open. W

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If any adjustment is made to the rear brake pedal make certain the brake does not bind and also see there is not excessive free pedal movement before

DRIVINGFUELAt the time of publishing this instruction book only one grade of motor fuel (Pool Spirit)is on sale, but it may be that soon the variou

STARTING THE ENGINE (a) See that there is sufficient fuel in the petrol tank. (b) See that there is sufficient oil in the oil tank. (c) See that the g

STOPPING THE ENGINE To stop the engine, close the throttle, raise the valve lifter lever and keep it raised until the engine has ceased to revolve. ON

Special attention must be given, during the running in period, to such details as valve rocker adjustment, chains, brakes, contact breaker points, and

CHECKING OIL CIRCULATION Provision is made to observe the oil in circulation and it is advisable to do this before each run. If the filler cap on the

LUBRICATION LUBRICANTS TO USE Efficient lubrication is of vital importance and it is false economy to use cheap oils and greases. We recommend the fol

FILLING THE GREASE GUN The standard grease gun consists of a barrel having a spring loaded end cap, to which is fixed a central steel piston in the sh

Illustration 5 Engine Oil Circulation THE OIL TANK AND FILTERS The level of oil in the supply tank should never be allowed to fall below the low level

WHEN CORRESPONDING REGARDINGSERVICE OR SPARESALWAYS QUOTE THE COMPLETE ENGINE NUMBER (Including all letters in it)Including all letters

A metal gauze strainer (secured to the feed pipe union) stands in the oil tank. After the first 500 miles, again at 1,000 miles, and subsequently at 5

Illustration 6 The inlet valve guide is shown withdrawn as also is the inlet valve stem adjusting screw (with lock nut) 1 2 3 4 5 6 7 8 9 PLAIN HOLE,

GEAR BOX LUBRICATION Use one of the grades of Oils already specified. In no circumstances must heavy grease be used. Lubricant is inserted through the

BRAKE EXPANDER LUBRICATIONGrease nipple on each brake expander bush. (One on each brake cover plate.) Usegrease sparingly. Excessive g

LUBRICATION CHARTIllustration 7 Lubrication ChartEngine Oil LocationsTallow Location178919124MAIN OIL TANK.CONTROL LEVER MOVING PARTS.BRAKE

MAINTENANCESADDLE ADJUSTMENTSaddle adjustment is provided at both front and rear ends. Importance is attached tothe desirability of own

EVERY 1,000 MILESOil tankRear chainMagneto chainGear boxHubsExpandersSteering headSmall partsAir FilterDrain at first 1,000 miles and re-f

FREE SERVICE SCHEMEFREE SERVICE SCHEMEAll owners of N E W MODELS are entitled to one FREE SERVICE AN DINSPECTION at 500 miles, or, at

ENGINE SERVICEACCESSFor almost all service work to the upper parts of the engine, it is necessary, in order toobtain accessibility, first, to

TO REMOVE THE PETROL TANKClose both petrol taps and disconnect the petrol feed pipe from each tap. (Use twospanners, one to hold the t

MAINTENANCE MANUALAND INSTRUCTION BOOKforA • J • S 1 9 5 1 SINGLE CYLINDER MOTOR CYCLESCompiled and Issued by the Manufacturers : A • J •

Inspect rubber fillet on rocker box side cover and renew if not perfect.Replace the side cover ensuring that a fibre washer is fitted

To replace valves :—After cleaning valve guide bores withrag smear each valve stem with cleanoil and reverse procedure above.IMPORTANT NOTE :—

REMOVING CARBON DEPOSIT Do not use a sharp implement for removing carbon deposit from the interior of the cylinder head and the piston crown. A blunt

The grinding is accomplished by smearing a thin layer of fine grinding paste (obtainable ready for use at any garage) on the valve face and then, afte

Remove One gudgeon pin circlip. It is immaterial which circlip is removed. Use special pliers included in tool kit. Gudgeon pin by pushing it out of p

VALVE TIMING Inlet valve timing Inlet valve opens 32° before top dead centre. Inlet valve closes 63° after bottom dead centre. Exhaust valve timing Ex

TAPPET ADJUSTMENT The top ends of the two long push rods have screwed extensions. These are locked in position by nuts, thereby providing tappet adjus

TO RE-TIME THE IGNITION The maximum advance is ½" (39°). Have available a stout screwdriver, or an old type tyre lever with turned up end, and a

Illustration 14 The rotating oil pump plunger is here shown partially with-drawn, together with the guide screw which registers in the plunger profile

NOTE—Remember there is a paper washer under each oil pump end cap and, whenfitting a new paper washer to the front cap, ensure the

1951 A•J•S MODELS350 MODEL 16M RIGID FRAME350 MODEL 16MS SPRING FRAME350 MODEL 16MC COMPETITION RIGID FRAME350 MODEL 16MCS COMPETITION SPRING FRAME500

Illustration 15 Showing the mixing chamber with details of the pilot jet with its air adjusting screw and the throttle stop screw 38www.ajs-matchless.

CARBURETTER SERVICEThe information given in this section includes all that will normally be required by theaverage rider. For further detai

CARBURETTER ADJUSTMENTTo ascertain if the setting is correct, a rough test Is to warm up the engine and, with theignition fully retarded and the air

CARBURETTER TUNING INFORMATIONPoor idling may be due to : Air leaks. Either at junction of carburetter and inlet port, or by reason of bad

TRANSMISSION SERVICE THE GEAR BOX The gear box provides four speeds and has a positive foot change, operated by the right foot, and a kick-starter. It

TO REMOVE FRONT CHAINCASE AND CLUTCH ASSEMBLYTo remove outer half of front chaincasePlace tray under chaincase to catch oil.Remove exhaust

TO RE-FIT THE FRONT CHAINCASE AND CLUTCHFit back half of front chaincase by : Place on face of crankcase boss and back face of chaincase s

Fit the front chain and lock the clutch centre nut by : Replace the front driving chain. Ensure the spring connecting link is fitted so that the close

THE CLUTCH (See Illustration 17)It should be noted that, although the basic design of the clutch fitted to 1951 modelsis identical t

If, to remedy clutch slip, it is necessary to screw nearly home the five nuts, this is a clearindication that, either the clutch springs have l

1951RIGID16M and 181951SPRING16MS and 18S 1951RIGIDCO MP E TI TI ON16MC and 18C 1951SPRINGCOM PETI TIO N16MCS and 18CS3www.ajs-matchless.info

Illustration 18 Details of clutch operating lever 175-X-4 67-X 330-X 66-X-7 329-X LEVER, OPERATING CLUTCH. BALL (STEEL), FOR OPERATING PLUNGER. OPERAT

FRONT CHAIN ADJUSTMENTTighten the front chain by : Slacken : Nut on right-hand side of gear box top fixing bolt.Nut on right-hand side of g

REAR CHAIN ADJUSTMENT (Rigid Frame Models)To provide rear chain adjustment the rear wheel is bodily moved in the frame fork ends,which are open e

MAGNETO CHAIN ADJUSTMENT The magneto platform hinges on one of its fixing bolts. This provides sufficient move-ment for adjustment to the magneto driv

FORK & FRAME SERVICE STEERING HEAD ADJUSTMENT The steering head frame races are of the floating self-aligning type and have spherical seats. There

Introduced in early 1941, for use under strenuous war conditions by all the allied armies, it remains unaltered, except in detail, to this day, and co

has no other source of escape but past this sleeve and the adjacent small metered bleed hole. This intentionally restricted passage causes a considera

Unscrew the hexagon plug on top of each inner tube and slacken the lock nuts securing the damper rods attached. Then, before removing the hexagon plug

Illustration 20 56www.ajs-matchless.info

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DATAMakeA.J.S.Models 350 c.c. 51/16M51/16MS51/16MC51/16MCS500 c.c. 51/1851/18S51/18C51/18CSIdentityEngine Number Scamped on left hand side o

REAR SUSPENSION (Spring Frame Models) The rear wheel is mounted in a fork that is hinged just behind the gear box. The hinge has robust plain bearings

Illustration 22Showing " Ghost " view of " TELEDRAULIC " leg59www.ajs-matchless.info

To check oil content of " TELEDRAULIC " leg and top-up : (DEALERS' SERVICE ONLY) Dealing with one leg at a time, remove top securing bo

Remove battery from carrier. Disconnect oil feed pipe from bottom of oil tank. Disconnect oil return pipe from bottom of oil tank. Disconnect vent pip

WHEELS AND BRAKES TO REMOVE FRONT WHEEL Place machine on both stands. Remove the split pin, and pin, retaining yoke end of front brake cable to the br

Hold left-hand side of wheel tightly forward against the cam stop and pull backwards the right-hand side of the wheel so that the brake cover plate di

WHEEL BEARINGS AND ADJUSTMENT The wheel bearings are of taper roller type. The inner bearings for the rollers are integral with the wheel spindle in t

To re-fit, reverse the above procedure, remembering that, after cup (6), washer (5), spacer (4), oil seal (3) and washer (2) have been inserted in the

Illustration 24 Showing exploded view of hub bearing components in the order of assembly. Upper part is that of front bearings (Rigid and Spring Frame

TO DISMANTLE A REAR WHEEL BEARINGThese instructions need reference to the lower part of Illustration 24.Remove wheel from machine.Remove

ChainsModels350 Competition350 Touring500 Competition500 TouringAll rigid models (Touring)All spring modelsAll competition rigid modelsAll

BRAKE DRUMSThe front wheel brake drum is retained to the wheel by ten countersunk screws.The rear wheel brake drum is integral with th

Centralise brake shoes by : Ensure the nut binding the cover plate to the wheel spindle is slightly slack.Place on the brake expander lever a tub

Adjust rear brake by : Place machine on centre stand if spring frame, otherwise on rear stand.Screw further on the brake rod the knurled

Illustration 29 Showing brake rod ad-justment exhausted, in-dicating the need for brake thrust pin adjust-ment. (SPRING FRAME MODELS) TYRES AND SERVIC

TYRE REMOVALIt is not essential to remove a wheel from the machine to repair a puncture but it willusually be found desirable and more

TYRE PRESSURESThe following are correct minimum inflation pressures for specified loads per tyre : do.do.do.do.do.240 lb.280 lb.350 lb.400 lb.

ELECTRICAL SERVICE ELECTRICAL EQUIPMENT LUCAS electrical equipment is fitted and this comprises three independent electrical circuits, as follows : (1

Lubricate contact breaker cam and tappet by : Remove contact breaker as described on page 74.Saturate, with a few drops of thin machine oil, t

The foregoing instructions do not apply to competition models fitted with Racing Magnetos Type NR1. SPECIAL NOTE—Check the contact breaker point gap a

CHARGING A LUCAS type E3-N dynamo is fitted. It is anti-clockwise in rotation. The cutting in speed is 1250-1500 r.p.m. at 7 volts and at 1,850 to 2,2

Gear ratios (models 16MCS and 18CS)Engine sprocket size 15 teeth 16 teeth * 17 teeth 18 teeth † 19 teeth 20 teeth 21 teeth First gear18·69 to 1

(a) (b) (c) (d) (e) (f) (g) (h) (i) (j) (k) (l) (m) Remove Magneto chain cover, (Retained by 6 screws.) Remove nut and its washer fixing each magneto

The regulator and cut-out are accurately set during manufacture. If, under normal running-conditions, it is found that the battery is continually in a

The specific gravity of the electrolyte indicates the state of charge of the battery. With a fully charged battery the specific gravity of the electro

LIGHTING AND ACCESSORIES Headlamp A LUCAS type SSU-700-P headlamp is fitted. The replacement part number is 50945-A. It has a panel mounted on its top

Illustration 36Lucas snap connectorPart number 900269One snap connector is used in the rear lamp wire (the wires have red coloured sleeves)and

Screwed wire connectorA LUCAS screwed connector of the type shown in Illustration 37 is used in the wireconnecting the positive te

LIGHTING SWITCH SPEEDO ILL. DIPPER SWITCH HORN PUSH DYNAMO TO SPARKING PLUG SNAP CONNECTOR MAGNETO REGULATOR BATTERY (NEGATIVE EARTH) BATTERY CONNECTO

USEFUL INFORMATIONIn the following five paragraphs are particulars of failures and troubles that can occur,together with the probable r

Engine overheats may be due to : Lack of proper lubrication. (Quality or quantity of oil.)Faulty sparking plug.Air control to carburetter

CLEANING THE MACHINE Do not attempt to rub, or brush, mud off the enamelled surfaces because this will soon destroy the sheen of the enamel. Mud, and

Spokes (350 and 500 rigid and spring frame models)LocationFront, left sideFront, right sideRear, left sideRear, right sideTypeButtedBu

Parts sent to us as patterns, or for repair, should have attached to them a label bearingthe sender's full name and address. The instr

SERVICE The Service and Repair Department is situated in Burrage Grove, Plumstead, London, S.E.18. and is open on Mondays to Fridays from 8.30 a.m. to

THE MACHINE AND THE LAWEvery motor cycle used on the public roads must be registered and carry the registrationnumbers and licence disc allotted

GUARANTEEWe give the following guarantee with our motorcycles, motorcycle combinations and sidecars,which is given in place of any i

TOOLS AND SPECIAL EQUIPMENTTOOLSThe standard tool kit, issued with each new machine, contains : 11211111111211111101725301711401700701724801118

BADGESNeat monogram badges are now available at a cost of 1/6, plus 6d. postage. They canbe supplied as a tie pin, as a brooch or fo

ILLUSTRATIONSIllustrations PageBa tteryBrake adjustment, frontBrake adjustment, rear (rigid frame)Brake adju stment, r e ar (spring frame)Brake shoe a

INDEXCarburetter ServiceControlsDataDrivingElectrical ServiceEngine ServiceFree ServiceFork and Frame ServiceGuaranteeIntroductionLubricationLubricati

KEY TO THE COLOUREDIDENTIFICATION BANDS ONTHE NUMBERED CABLESSHOWN IN THE WIRINGDIAGRAM ON PAGE 84.1781314REDRED and BLACKYELLOWYELLOW

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