Leyland 4.4 dizzy swap

[awright]

Picked up an EFI dizzy with an adaptor for the carby model. It all works fine which is great but the gearwheel and adaptor is an extended female adaptor instead of a recessed male adaptor. Ie it dont fit. And the head units cannto be swapped -at all. Can I get an adaptor anywhere in Vic- any bright ideas???

[Philip A]

Doesn't the gear just come off by drifting out the roll pin? I presume you are talking the oil pump drive.
Regard sPhilip A

[awright]

it does on the new one but not on the one that is in there now. Therefore I cant swap it because It is fixed in on the old shaft.

All that is cool but I need a new adapter gear to go on the new dizzy with a recessed male end-one that does just swap over onto the new dizzy. I hope that makes sense...

[Philip A]

I haven't really looked at it recently, but another approach could be to change the adaptor that sits at the top of the oil pump driven gear or if it connects to the gear itself change to the appropriate gear . I really cannot remember its been so long since I rebuilt an engine.
Regards Philip A

[peter r]

G`day awright , don`t really understand from your description but ,


Later Rover carby and efi use the same type drive , both are male slot drive , like a thick screwdriver blade . The dissy drive for both is a female , like a round tube with a slot in it .

The Leyland 4.4 and early Rover use similar but opposite to later Rover , a female drive for the pump gears and a male screwdriver type blade for the dissy . The shaft/gears are the same thin type in the earlier rover and Leyland ones .

I`m guessing but yours i think has either got the Leyland timing cover and Leyland pump or it will have the Rover timing cover with the Leyland/early pump gears .

I`m not certain the the pumps and covers are interchangeable but think they could be .

If you have a later Rover dissy , in original form what you may need is the later pump gears and timing cover to go with it because there is a difference in thicknees between the early and late pump gears .

I would have thought the drive of what i guess is a Leyland/early Rover dissy would come off though .

Understand that i`m not being very clear , if you came post/send some pics of both , may be easier .

All the best , Peter .

[Series - V8]

I just did this swap recently. I put a DMLR8 Elec dizzy from a disco into a 3.5L 82ish rangie motor. Works an absolute treat.

I had the same probs as you. The original scenario was a rigid drive on dizzy with male receiver in drive gear. Obviously inferring a female receiver in the oil pump shaft.

The replacement dizzy is a wobble drive (You should notice that the drive gear flexes.) with a female receiver. This dizzy is slightly longer.

So the replacement dizzy will not match up to the old oil pump shaft. I thought, simple replace the oil pump shaft with a newer one with a male receiver. The new gear arrived but I realised the new gear and shaft are from a high flow oil pump ie the oil pump gear is thicker and therefore would require replacing timing cover.

So this might make you kringe but I took the angle grinder to the old oil pump gear to turn female to male. So the original oil pump shaft (modified) now engages the new dizzy.

Remove the oil pump gear and shaft from the oil pump and remove the old dizzy from the motor. Lay them on the bench as they would be in the motor ie tongue engaged. Mark or measure on the bench the distance from the bottom of the oil pump gear to the matting surface of the dizzy.

Remove the old dizzy and lay down the new one. You now have to cut the old oil pump shaft so that the overall length is the same as with the old dizzy. Once you have the correct length you have to grind the sides of the shaft to make a male tongue that will engage the new dizzy easily but with little play. It does not have to be perfect to work well. If you are more particular than me you could get an engineer to mill to the correct shape.