Charge problems on Lucas C39-40 Dynamo's

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NAME="lucas_c39_c40_c40l_charge_problems"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="1" ALIGN="bottom" WIDTH="1" HSPACE="0" VSPACE="0" ></A><FONT SIZE="3" COLOR="#000000" FACE="Dutch801 Rm BT" ><B>Lucas C39 C40 C40L Charge problems</B></FONT></div> <bR> <bR> <bR> <div> The dynamo is easy to check:</div> <div> 1) Bearings - slop in pulley-end ball-bearing or commutator-end bush? Rumble</div> <div> from bearing? Note that the classic way to burn out a Lucas dynamo is by</div> <div> failure to oil the commutator-end bushing. On an Imp the hole with the word</div> <div> "OIL" is invisible; on Minx etc it's stuck too close in front of the</div> <div> exhaust-pipe! When the bush wears, it eventually allows the armature to rub</div> <div> on the field pole-shoes resulting in heat from the friction. If you then</div> <div> drive on a wet night, with maximum electrical load from headlights, wipers</div> <div> and blower, the armature-winding fries.</div> <div> 2) Brushes - enough length left; free to move?</div> <div> 3) Windings - sniff test!</div> <div> 4) Output voltage when disconnected, and with 12 V applied to the Field</div> <div> terminal only.</div> <div> If it passes these tests, it ain't the dynamo that's at fault...</div> <div> -</div> <div> RB340 Control Box:</div> <div> Clean all 3 contact pairs with the edge of a business-card or similar, then</div> <div> apply a drop of WD40 to each. And then ask it 'what seems to be the</div> <div> trouble?' With the cover removed, on increasing revs the Voltage contacts</div> <div> should 'buzz' and the Cutout contacts should close. If the battery is fairly</div> <div> flat, the Current-limit contacts should also become active, but otherwise</div> <div> they'll just sit there.</div> <bR> </td> </tr></table></body>