ONLY SMC MEMBERS CAN ORDER SPARES FROM THIS ONLINE SHOP

0 Items
£0.00

Wishlist
0 Items

Account / Register
You are here: home distributor - mayflower positive earth

Distributor - Mayflower Positive Earth

Standard Motor Club Pre 1948 Distributor – Electronic Positive Earth Version

Introduction (Items in red refer to the Mayflower)

These instructions apply only to kits supplied by the Standard Motor Club This Electronic Distributor Kit is based on one supplied by Accuspark, a leading UK supplier of Electronic Ignition Systems. This non-vacuum Distributor is modified by the Club to fit a range of our cars. Please note that the Distributor, if supplied directly by Accuspark, does not carry the Clubs’ modifications so can not be used. You must use the version supplied by the SMC. Be aware that no liability will be accepted for the use of any other, non club supplied Distributor. There is no liability for parts fitted not according to these instructions

This Distributor is only for vehicles that are wired for Positive Earth

Preparation

Please read these instructions to the end. If using Soldered Connectors, You will need an electric miniature soldering iron and flux cored solder to complete the work.

Please ensure you have the skills required to complete the tasks below. IF you are unfamiliar with vehicle electrical systems you may wish to employ an Auto Electrician.

VERY IMPORTANT NOTE:

Unlike points based distributors, Electronic modules are polarity sensitive. Do not assume that, just because it is working, that your car is presently wired correctly. Many cars may have their coil connected in reverse and if you persist with this, the wrong polarity will destroy the electronics.

Your car may have had  its polarity changed in the past – you must take care to ensure the polarity is correct before proceeding

Before you start, you must ensure that the live feed from the ignition is connected  to the NEGATIVE (switch) terminal of the coil. Check you have a negative reading with a voltmeter. Failure to do this will void the warranty and require you to purchase a new electronic module. There can be no relaxation of this strict rule.

To prepare the wiring on your New Distributor

There is a long white wire and a shorter black wire. Lay in the new Distributor and judge if these wires need extending or shortening for your application

  • It may be necessary to shorten the white wire, but  then add a Female Lucar Connector, supplied, to it, 
  • It may be necessary to extend the black wire  but then terminate it in another Female  Lucar Connector supplied

How to fit the Distributor DK4A and DKY4A, only (for fitting DJ and DKHY4A type see instruction 30 )

OLD DISTRIBUTOR

  • Disconnect the battery
  • Set the old Dist. to TDC on the firing stroke on No.1 cylinder, which is the cylinder nearest the Windscreen
  • To find TDC remove the bolt in the head above No. 1 cylinder and use a long rod or thin screwdriver
  • Ensure the Distributor is on the firing stroke by removing the Distributor Capp and ensuring that the points are just breaking and the rotor arm is opposite the Number 1 HT terminal
  • Clean the crank pulley and a section of the timing cover and make 2 marks opposite each other as shown

  • This can be used later for timing with a strobe timing light, if you have one
  • Remove old Distributor and Housing by undoing the 2 nuts
  • To remove Dist. from housing undo the small locking nut and withdraw the small safety bolt from the housing. Withdraw the Dist.
  • Mark the offset drive so that you can refit it later in the same orientation
  • Drive out the roll-pin and remove original long drive shaft

NEW DISTRIBUTOR

  • Carefully mark drive on the new Dist. and note offset. Remove rollpin and the drive
  • Offer up the original drive onto new shaft without a rollpin
  • Use a “Dummy” rollpin such as a small drill shaft, and check clearance on underside of body. If there are shims fitted, remove one thin shim and replace with washer supplied
  • The objective is to remove any and all up and down movement of the distributor drive. When acceptable, fit original long drive and the rollpin ensuring that the offset is in the same position.
  • NOTE: If you wish to use the new rollpin, you will need to open out the hole in the original long drive
  • Fit new Dist. to the housing using the original clamp, small safety bolt and locking nut. Screw in the safety bolt fully then back off  a fraction so the distributor turns freely but can not jump out of the retaining groove. Beware, if this is not done correctly the shaft can rise and disengage the oil pump drive. RESULT – NO OIL PRESSURE Lock off the nut
  • Refit the Dist. and its housing onto the studs and replace the nuts, making sure the Dist. is sitting flat on the head.
  • Turn the Dist. until the Rotor aligns with the mark on the base of the Dist. body
  • Lock the Dist. Clamp to prevent the Dist. from turning
  • Change-over HT leads to new cap. Refit new cap and set firing order to 1,3,4, 2 anticlockwise.
  • NOTE: If using a new Top Entry Cap, fit 5 new HT ends and rubber boots (both supplied in the kit) to the HT leads
  • Use the wiring diagram, and follow the wiring instructions below
  • Remove wire from – SW Neg side of the coil and connect the loop to  the bare male connector and nut, bolt and locking washer supplied. Use the small piece of Heatshrink supplied, to insulate the joint.
  • Remove wire from + Pos CB side of coil. Refit to the -SW Neg side of the coil  
  • Fit the loop at the  other end of this wire with a second bare male Lucar  connector with nut bolt and locking washer  Use the second small piece of Heatshrink supplied, to insulate the joint. Fit this into the female  connector on the black wire to the Distributor
  • Use the supplied short new wire, to fit from +Pos CB  to a nearby earth (maybe under coil bracket?)
  • Ensure all electrical connections are fully insulated Twist the black and white wires together (around themselves) and ensure they do not touch hot surfaces. Reconnect Battery and Test
  • Most DJ type distributors use the same drive as the New Distributor so therefore it is only necessary to follow instructions 1 to 10, then 19 onwards
  • NOTE: For the DJ type It will not be necessary to fit the shaft with the supplied washer.
  • Note that for the DKHY4A type, the intermediate drive shaft will need to be transferred from the old unit to the new

 

NOTE: Place Heatshrink on both joints and tighten by 10 sec  blast from Hair dryer or Heat gun

 

Contents of the Distributor Kit:

 
  • Non-Vacuum Distributor complete with Distributor Cap, Side or Top Entry
  • Small  spacing Washer
  • 2 x Female Lucar Connectors with Insulators
  • 2  x Small bare male Lucar Connectors
  • 2 x Small nut, locking washer and bolt  with
  • 2 x heatshrink insulator sleeves
  • Terminated Short Connecting wire
  • IN addition, top entry caps are supplied complete with 5 HT terminals, and 5 rubber boots at additional cost, if you have chosen that option.
 

Standard Motor Club

 

Issue 2 01/11/23