The Triumph Dolomite Club - Discussion Forum

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PostPosted: Tue May 01, 2018 6:04 pm 
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Sounds similar to what happened to me, my Magnetronic failed with a MS3 coil, luckily I had points and condenser to change at roadside.

Upon further investigation I found the coil overheating had somehow left it with only about half the fluid it had from new (7 months old).

Ordered MS4, installed with original Magnetronic, all good for around 500 odd miles over a month or so. Failed on the way to Stoneleigh in the middle of the road for no reason. Not the MS4 coil, the Magnetronic this time, again the 25 year old points and condenser came to the rescue. (I forgot to mention, two year old points condenser combo, failed with a couple of months after install).

Had enough of new bits going wrong, so i decided best put the old Lucas sports coil and points back, but due to lack of future old stock availability, pushed forward with 123 dizzy and coil installation.

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PostPosted: Tue May 01, 2018 7:18 pm 
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Is this the screw that RobSun and matienzo are going on about, it seems to be bending my base plate up a little, does it need insulating underneath the screw? and does it need shorting?

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PostPosted: Wed May 02, 2018 11:35 am 
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That looks like the screw, it fixes the electronic unit to the distributer. Try shortening the screw as it is too long and fouls beneath the distributer plate and in my case left the unit loose. In your case it looks to be bending it as you say. If you remove the unit and find signs of tracking and arcing that is probably the issue. Mine was completely black under with soot like deposits. It had been on for 3 years and the main problem was misfiring at cruising speeds with the cutting out you experience on a less regular basis.

As I said earlier I didn't fix mine I binned it only finding the potential cure later.


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PostPosted: Tue May 15, 2018 6:12 pm 
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Binned the lumenition, back on points with a decent condenser, when for a 15 mile road test and she runs a treat, well happy now

Cheers

Steve


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PostPosted: Sat May 19, 2018 3:58 pm 
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Hear we go again, 100 miles after fitting points and guess what, yep you guessed it, it broke down. I did however take a spare coil for when it broke down and tried that. Nope, different, this is getting a bit tedious now


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PostPosted: Sat May 19, 2018 4:28 pm 
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Worth checking the coil lead to the distributor cap, and also the springed contact.

Also you may want to try another condensor and check the braided earth lead connecting the distributor base plate to distributor body.

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PostPosted: Sat May 19, 2018 4:32 pm 
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Hi Steve, There are a couple of other things I'd like to suggest. I assume you have the standard A.C. Delco distributor. I had a problem with mine back in 2016 I see, which is very Delco specific.
Stay with the points for now, but trace the white / black wire from the IGN coil neg to where it enters the underside of the distributor. There are 2 weak points. One is about 1/2 in back from where the sliding spade connector to the points is . As you can see on mine this had worn through and was intermittently shorting to earth :-(
The other weak point is where the white / black wire comes through the base of the casting and is knotted to stop it pulling back through.It runs close to the base plate.
To check the problem it might be easier to just completely replace the wire.
Photo herewith.
If this is O.K. let me know as I have another suggestion.
Tony.


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PostPosted: Sat May 19, 2018 4:47 pm 
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I had that very same wire break a couple of times back in the 80's on different dolly's. Well remembered Tony, and your right, it is on delco's. :?

Tony.

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PostPosted: Sat May 19, 2018 9:45 pm 
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Had a quick check of the wire to the dizzy all looked fine, the car started up first time in the garage no problems, this only caused me more headaches. After another route around I found some red insulating tape over some wires on the ignition switch cable. I had a little pull on the wires and one came out. I'm 90% convinced this is my gremlin. Ive got a new ignition cable on order

Image

Hopefully this is the end of my issues, but I'll keep you updated

Cheers

Steve


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