Instruction manual

ManualsBrandsA.J.S. ManualsAutomotive18S

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Remove Magneto chain cover, (Retained by 6 screws.)

Remove nut and its washer fixing each magneto chain sprocket.

Using a sprocket withdrawal tool, or wedges behind sprocket, release, in turn,

each magneto chain sprocket and take them away, complete with chain.

Remove timing gear cover (retained by 5 screws) taking care not to allow the two

camshafts to come out of engagement with the small timing pinion.

Remove outer portion of front chaincase. (See page 43.)

Remove spring circlip, lock washer, nut and plain washer under nut that retains the

chain sprocket to the dynamo armature shaft.

Using a sprocket withdrawal tool, or wedges between sprocket and dynamo body,

release the sprocket from the dynamo shaft.

Slacken nut on right-hand end of the gearbox top fixing bolt.

Remove nut on left-hand end of the gearbox bottom fixing bolt, and drive bolt out.

(It may be necessary to remove the oil return pipe from the oil tank to do this, and

this necessitates draining the oil tank first.)

Disconnect cables attached to Dynamo end cover by unscrewing central bolt fixing

the retaining plate to the cover.

Sufficiently unscrew the bolt clamping the dynamo in the engine rear plates to allow

the dynamo to have free movement.

Pull back the bottom of the gearbox as far as possible.

Rotate dynamo till the locating plate on its body is in a position to enable it to pass

the cut away parts of the engine plates, and then withdraw the dynamo from the

kick-starter side of the machine.

TO RE-FIT DYNAMO

Reverse the above procedure. If camshafts have been displaced, see page 33 for

retiming instructions.

Re-set ignition timing by instructions on page 35.

See page 51 for instructions on re-setting magneto driving chain, and, finally, check

adjustment of front and rear chains. See pages 49 and 50.

The cut-out and regulator unit (A.V.C), is type MCR-2, and the replacement

part number is 37144-A.

Although the voltage regulator and the cut-out are combined structurally, they are

electrically separate.

The regulator is set to maintain a pre-determined generator voltage at all speeds and

regulates the output of the dynamo to the battery according to the state of charge of the

battery. The charge rate is at its maximum when the battery is discharged, automatically

tapering off to a minimum as the battery becomes charged and its voltage rises.

Normally, during day-time running, when the battery is in good condition, the dynamo

gives only a trickle charge, so that the ammeter reading will seldom exceed 1 to 2 amperes.

The cut-out is an automatic switch which is connected between the dynamo and the battery.

When the engine is running fast enough to cause the voltage of the dynamo to exceed

that of the battery the cut-out allows the battery to be charged by the dynamo. On

the other hand, when the engine speed is low, or the engine is stationary, the cut-out

disconnects the battery from the dynamo, thereby preventing current flowing back from

the battery to the dynamo, a proceeding that would soon cause the battery to become

completely discharged.

TO REMOVE DYNAMO