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 Post subject: HT leads
PostPosted: Thu Nov 20, 2014 5:27 pm 
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Location: Lot et Garonne, France
Ok, I have been an idiot again and forgotten to label my HT leads and distributor cap. Does the HT lead on the left hand side of the distributor cap (from back facing forward) go to the LEft hand cylinder head or the other way?

Cheers
Muppet.

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Doug Hart

1972 AP 700


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 Post subject: Re: HT leads
PostPosted: Thu Nov 20, 2014 7:40 pm 
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Location: Lewes, East Sussex - UK
As far i as I know, for your engine:-

Facing the engine from the back of the vehicle, the left hand HT lead on the distributor goes to the left hand cylinder (No 1). The right hand HT lead goes either through the hole in the crank case that is behind the big crank shaft pulley wheel or over the top of the Dyanastart Fan housing.

Lurch originally had it behind the pulley wheel. Whilst I could start and run the engine at idle, every time I tried to increase the engine revs it would die! I changed the points, the condenser, the spark plugs, did the timing lots of times - but it would have none of it. In desperation, I took the HT leads off and discovered the some nice little furry thing had been hiding behind the pulley and nibbling at the HT and had exposed the central core! So everytime I increased the revs, the spark would jump the air gap behind the pulley wheel and no spark in cylinder two....

These engines don't run well on only 1 cylinder!

John

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 Post subject: Re: HT leads
PostPosted: Thu Nov 20, 2014 10:49 pm 
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Wrong! Service manual states L cyl to far rt term.
Basically it works either way, but correct way is L plug to RT term , RT plug to L side of dist all models/years.

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 Post subject: Re: HT leads
PostPosted: Fri Nov 21, 2014 7:51 am 
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Location: Lewes, East Sussex - UK
So which way works better?

The parts book's exploded diagrams suggest that things are fitted the way I have described.

The owners operating instruction booklet has pictures showing the distributor and all show the HT leads with the LH distributor lead curving over towards the right hand side. There is NO mention that I could see in the Ignition timing section which actually states which lead goes to which cylinder.

I have seen engines with the HT leads both ways round. Also if you line up the crank pulley on the timing mark, it tells you to use the LH cylinder as No1. Most of the engines I have seen with the LH distributor HT lead going to the LH cylinder have been later 1970 > engines.

I must admit that I have not tried to set the timing with the HT leads the other way round as Lurch came with the leads describes as above.

I don't dispute that the leads could be fitted the other way round, so maybe i'll try this weekend if it isn't raining!

John

(Had a better look at the pictures and adjusted text to match)

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 Post subject: Re: HT leads
PostPosted: Fri Nov 21, 2014 8:43 am 
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Location: Canberra Australia
Just so happens I was working on this stuff today on my Haflinger.

Standing at the back of the car and looking forward I understand No1 cylinder is the left on the drivers side for a left hand drive and No2 Cylinder is the right on the drivers side for a right hand drive.

So I don't forget what goes where I have my Dizzy cap numbered.

Image

So the lead at the rear of the vehicle is No 2 lead and goes to number two cylinder to the right.

No 1 lead is a little obscured but is closest the the fan tin so closest to the front of the vehicle and goes to No1 cylinder on the left.

So as Jim said = both ways will work.

Cheers

Garry

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 Post subject: Re: HT leads
PostPosted: Fri Nov 21, 2014 10:20 am 
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Location: Launceston Tasmania AUS,
I just always set them up as left for left , right for right .
just logical .

kerry

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 Post subject: Re: HT leads
PostPosted: Sat Nov 22, 2014 7:39 am 
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Location: Lot et Garonne, France
Ok,

Based on the replies, do I have to reset my ignition timing halfway through the channel tunnel :ugeek: :ugeek:

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Doug Hart

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 Post subject: Re: HT leads
PostPosted: Sat Nov 22, 2014 10:32 am 
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Location: Lewes, East Sussex - UK
Doug,

Given that the above suggests that it doesn't matter which way round you put the HT cables.

Everybody atleast seems in agreement that you use the left hand cylinder as No 1 (Timing is usually based on No 1 cylinder)

With the distributor cap off, but the arm in place. Turn the engine over clockwise until the left hand cylinder piston is at top dead center on compression. (take out the right hand spark plug, leave the left hand one in until you have worked out when it is on compression). The timing mark on the pulley should line up with the mark on the Dynastart fan case.
Now look at where the distributor arm is pointing.
That is the one to use for the short HT lead going to the left hand cylinder spark plug.

I actually don't believe it will run very well if you get it the wrong way round as I can't see how you can time it correctly. I think there are two different distributor fitted to engines.

Worst case, you will have to set the ignition timing twice!!!

John

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 Post subject: Re: HT leads
PostPosted: Sat Nov 22, 2014 7:16 pm 
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Location: Lewes, East Sussex - UK
This is why i think there are more than one sort of either distributor or at least distributor cap:-

Attachment:
distribtor.jpg
distribtor.jpg [ 209 KiB | Viewed 1287 times ]


It looks like the leads are facing different directions between mine and Gary's engine.

John

p.s. it might be down to the fact that the two distributors are turned about 90 from each other judging by the capacitor and the clip that holds the top in place. So that could be the reason for using HT leads to different cylinders.

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 Post subject: Re: HT leads
PostPosted: Sun Nov 23, 2014 7:35 am 
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Attachment:
ignitiontiming.jpg
ignitiontiming.jpg [ 314.8 KiB | Viewed 1272 times ]


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 Post subject: Re: HT leads
PostPosted: Mon Mar 16, 2015 7:06 pm 
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Location: Lewes, East Sussex - UK
I have seen engines (including mine) with the HT leads set with the left hand side of the distributor cap HT lead going to the left hand cylinder and engines with the left hand side of the distributor cap HT lead going to the right hand side cylinder.

There must be at least two different distributors available as the operators manual states that as the points gap opens on the cam, the rotor arm should point the notch on the side of the distributor case. Which ever HT output on the distributor cap the rotor arm is then pointing at should go to the left hand cylinder.

John

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