HEI Distributor

for more information on the Bosch HEI Distributor go to the "Holdenpedia" search for Bosch HEI,or "http://www.oldholden.com/possible/index.php/Bosch_HEI"<br>there is heaps of information there submitted by "T" WELL WORTH READING

HEI Distributor

HEI Distributor with the Cap removed, Rotor Button still on the drive shaft, you can see the Helical Gear that is driven by the cam shaft,some of these gears come in Steel, this on is made of Nylon,

Bosch HEI Distributor

Bosch HEI Distributor the cap has been removed, along with the Rotor button from off the top of the drive shaft

HEI Distributor

HEI Distributor NOTE: you can see a clear nick has been made there on the rim ridge, about 7 0'clock, this mark is used so in order to set the Timing position for number one cylinder, when the Rotor Button is in align with this mark, make sure that the No 1 cylinder is at TDC , also at about 11 o'clock ,tere is a small section that has been cut out of that ridge, this is a location slot for the Distributor Cap to locate into.

HEI Distributor

see the timing mark, bottom of the picture, the slot on the drive shaft, the Rotor Button locates onto, to drive, see the felt pad in the centre of the shaft, now the thing is to remove the cir clip to get the Reluctor off the drive shaft

HEI Distributor

The Vacuum Canister removed from the side of the Distributor, two short screw, also the modulator cover, two long screws.

HEI Distributor Vacuum Canister

The Vacuum Canister removed, NOTE: the marking 212, these are the Spring Tension and Travel of the Vacuum Advance this one means is has a tension of 2 ,and the shaft travels 1.2 mm's. The longer the travel, the more vacuum advance will be applied to the Distributor. The lighter the spring (a 1 is lighter) the easier it will be for the vacuum advance to be applied and the earlier the vacuum advance will reach its maximum amount. Typical markings are 212, 214, 230

HEI Distributor

you can see the small location Dowel Pin that the vacuum arm locates up onto the base plate of the Magnetic Pick Up Coil inside the Distributor Housing, this can be a bit tricky to remove and put on, by removing the two screws holding the vacuum canister on the side of Distributor, then slightly pull away and press the vacumm arm down off the location Dowel Pin, if it's stuck slip a small screwdriver in there to press the arm down and wiggle it a bit it should then drop down off the Dowel Pin

HEI Distributor

the Module removed, as well as the Magnetic Pic Up from the Distributor housing

HEI Distributor

here you can see the four terminals from the modulator, that the wires come from, you can also see some white grease sticking out from the Module, it's called Silicon Grease, it stops the Module from over heating, otherwise the Module will overheat then begin to perform intermittently and ultimately fail, the 2 black wires go to the Magnetic Pick Up, smallest connector (3) larger connector (7) Connector 15 (pink wire) is the power supply to the module to drive the internal transistors, goes to Ignition Coil + positive, the Green wire to Ignition Coil - negative

HEI Distributor

The Pink wire connects to the Coli +ve and carries the +12 Volt supply to the Module. The Green wire connects to the Coil -ve and performs the Coil current switching. There are 2 wires from the Magnetic Pick Up each with a different sized connector matching a different sized connection. Disconnect all 4 of these wires and lift the Module clear of he Distributor Housing.

HEI Distributor

this is a Nylon Helical Gear, some are made of steel, the Rolled Pin needs to be knocked out with a small punch, there are shim spacer located the on the shaft when the Helical Gear has been removed from the drive shaft, the end play, is normaly about .008" .015" when it all back in place in side the housing small hole you can see is were the oil enters to lubricate the drive shaft

HEI Distributor

here I had marked the helical gear before I took it off the drive shaft, guess it doesn't matter it's just something that I do, sort of a force of habit when i'm dismantling things, anyway it up to you, you can see the Silicon Grease here which is vital that the white heat-conducting Silicon Grease be placed between the Electronic Ignition Module and the alloy it mounts on otherwise the Module will overheat then begin to perform intermittently and ultimately fail.

HEI Distributor

here the "C"pin or Rolled Pin has been tapped out,the Helical Gear removed from drive shaft, along with the three shim spacers Note: not all of the spacers are metal the middle one is a fiber like material, must act as an oil pad to lubricate the other two or stop any noise between the spacers, really not sure here just guessing, but but back it back in the middle of the steel washers

HEI Distributor

this Alan key screw one of two that hold the coil retaining plate needs to be removed in order to pull the drive shaft out, these screws can be very tight, so use a good Alan key , one that will not break or bend, best if you can hit the allan screw with a FLAT dowel punch that sometimes can free the screw up if its really tight, don't forget to support the housing when holding it in the vice, as you don't want the dizzy to slip when you hitting, make sure you hit the screw squarely as you don't want to bugger the hole were the Alan key fits, if you have a real dowel punch, one that can fit inside the Alan key hole then thats Evan better, you could use a brick nail as they are tough and might just fit, so check out your scratch box of bits and pieces to see what you can find.

HEI Distributor

here I'm removing the cir clip from the drive shaft in order to then remove the 6 star Reluctor, on v8 distributors of course there would be eight, under the cir clip there is a star dome washer, NOTE: when installing make sure that the dome is pointing UP, you can see the Magnetic Pick Up Coil in there as well as well

HEI Distributor

The six star Reluctor now removed, use a couple of screw drivers and slowly work around to lift it of as it is a tight fit, if you look closerly you can see that there is a small pointed notch sticking out the Reluctor hole, so the Regulator fits the correct position and it also drive it into the v shape grove on the drive shaft, for the Reluctor correct locating position on the drive shaft, notice here the little oil pad, thats been removed from the inside the drive shaft, so you can see it clearly, along with the cir clip and the domed spring washer NOTE: the dome on the washer faces UP when you reassemble it back

HEI Distributor

The Reluctor removed now reveals the Magnetic Pickup Coil, this is were a pulse is generated, that in turns sends the pulse onto the Module, and it then sends a signal to activate the ignition coil. NOTE:that the two cir clip needs to be remove here,I had removed the two Alan screw previously, however one could have also removed them at this stage as well, might have been better here, as you can see more clearly, next bit is to remove the other cir clip

HEI Distributor

here you can see the Alan Key, located in the Alan screw head more clearly, these two Alan Screws retain the Magnetic Pick Up Coil base plate securely to the Distributor Housing

HEI Distributor

here is the Magnetic Pick Up Coil full view, and the two connection wires, see the two Alan screw, they are still there as the Magnetic is holding them,"NOTE: the two wire connection I marked them but, they only fit the correct size tabs anyway, to check the Magnetic Pickup coil Using an Ohmmeter, measure the resistance of these leads. The reading should be approximately 1200 Ohms. Caution: Don't touch the wires while you are taking the measurement. Your body will conduct electricity and cause a false reading.

HEI Distributor

Magnetic Pick Up Coil is turned upside down, showing how the Vacuum arm is located onto the small Dowel pin, you can see that two Alan screw that held the coil plate to the housing, they are stuck there by the magnet, you can test the Vacuum Canister easily here when off by sucking on the small pipe , if the arm doesn't pull in then it's had it, the diaghram is faulty, if there is a leak then by blowing you will here it leaking as well, so get a new Vacuum Canister as I don't think you can fix them

HEI Distributor

The drive shaft is now completely removed from the Distributor housing, you can see the bronze bush there ,they can be removed and replaced if need be, mine were OK

HEI Distributor

the drive shaft out of the housing, you can see some groves on the shaft they are oil slinger groves for oiling the drive shaft,notice as well 2 shim spacer on the shaft, the other one is still sitting in the housing body

HEI Distributor

an exploded view of the drive shaft plus all the components that come with it minus the distributor housing

HEI Distributor

the drive shaft Distributor Housing , showing the Nylon Helical gear , the Rolled Stainless Steel Pin that hold the Helical Gear onto the drive shaft assemble, the three Shim Spacers, there are two metal Shim Spacers, and one Fiber like Shim Spacer, this one is sandwich between the two metal shims, must lubricate the metal ones and maybe stop them making a noise, not sure realy, just guessing

HEI Distributor

the drive shaft and the three spacers that go on the drive shaft, NOTE: the fiber spacer is in the middle, and the metal spacers either side, it is then pushed down into the Distributor Housing, best to oil it slightly, if you turn and push it helps as it is a bit of a tight fit, then when in position it should turn quite freely by hand, then on goes the Helical gear.

HEI Distributor

here you need to tap the drive shaft up and twist it as well to get it out out of the distributor housing

HEI Distributor

Revealing the Balance Weight, you can see clearly the Balance weight, and the two springs, these weights should move out and back quite freely especially if they have been oiled from time to time by the felt pad located under the rotor button ,(here the felt pad has been removed) if they look worn out or there is a broken spring then it will need to be fixed up. otherwise you will get erratic ignition timing, NOTE: The Balance Weights have 2 springs. A thin one (Primary Spring) that holds the weights tightly and a thick one (Secondary Spring) that fits quite loosely. The second spring is supposed to be loose. It gradually adds extra tension to the first spring as the Balance Weights expand.

HEI Distributor

here the "C"pin or Rolled pin has been tapped out,the Helical Gear removed off the drive shaft, and the three shim spacers, Note: not all of the shim spacers are metal the middle one is a fibber like material, must act as an oil pad to lubricate the other two or stop any noise between the spacers, really not sure here just guessing, anyway sandwich that one between the two metal ones

HEI Distributor

you can see that the c pin or rolled pin is now ready to be put back into the drive shaft,securing the Helical Gear onto the drive shaft, as well as the three Shim spacers, NOTE: the center spacer is made of fiber and the other two, one on each side, are metal, that hole in the Distributor housing you can see is for oil to go through, it allows oil to enter there from the engine, and lubricates the drive shaft, there is also a thin fiber casket that goes onto that shank collar , (it's not shown in this pics, forgot, sorry)anyway ,it stops any oil from weeping up out of the shaft, where it is located in the side of the engine block ,and held down firmly by the fork like retainer clamp, about the last thing you put back in place.

HEI Distributor

a closer view of the Helical Drive Gear located on the drive shaft , you can also see the hole that supplies oil to the drive shaft as well

HEI Distributor

Reluctor is removed and you can see the Magnetic Pick Up

HEI Distributor

here I have cut three strips off a business card and have placed them in position between the Reluctor points and the Stator points, you should have an even clearance on all points of around .0006", you then tighten up the two Alan screws to secure the plate to the distributor housing. pull out the three strips and check that the there is clearance on all points of the Reluctor

HEI Distributor

these two Alan key screw need to be removed first,in order to pull the drive shaft out, they can be very tight, so use a good Alan key , one that will not break or bend, its best if you can hit the Allan screw with a FLAT dowel punch, to free the screw up first, when holding in the vice, use soft jaws or rag, make sure you hit the screw squarely, don't bugger the hole were the Alan key fits, a small punch one that can fit inside the Alan key hole is the best,

HEI Distributor

I'm holding the Primary weight Spring open here, Revealing clearly the Balance weights, and the springs, these weights should move out and back quite freely especially if they have been oiled from time to time, by the felt pad located under the rotor button , check them over, if worn out or a broken spring , replace, otherwise you will get erratic ignition timing Note:The Balance Weights have 2 springs. A thin one (Primary Spring) that holds the weights tightly and a thick one (Secondary Spring) that fits quite loosely. The second spring is supposed to be loose. It gradually adds extra tension to the first spring as the Balance Weights expand.

HEI Distributor

a close up showing the felt pad in the center of the drive shaft, when oiled this lubricates the balance weight actions , if not oiled from time to time then they will freeze up , and you will have erratic timing

HEI Distributor

The cir clip has been removed, and the six star pointer removed, correct name is Reluctor, if you look closely you can see a notch on the hole, as this locates the positioning of the Reluctor into the V grove of the drive shaft so the Reluctor can be driven around by it

HEI Distributor

close up of the The Ignition Module and the two small Black wires that go to the Magnetic Pick Up Coil, the other two wires that have been removed go to the Ignition Coil, Pink + Positive and Green - Negative

HEI Distributor

here you can see all of the wires,that hook up to the Module the two on the left go to the Magnetic Pick up, the other two on the right go to the ignition coil

HEI Distributor

Here all four wires are located on the module tabs, as you can see I did mark them, but each tab is a different size anyway, the two on the left are for the Magnetic Pick Up and the two on the right are for the Ignition Coil, Green - Negative and Pink = Positive

HEI Distributor

full exploded view showing all the parts of the Distributor minus the cap

HEI Distributor

an exploded view of the HEI Distributor, showing all the parts