How do I Refit 'Marelli' Ignition Modules?
#1
How do I Refit 'Marelli' Ignition Modules?
Hi Guys
I've got my Re-cored Rad coming back Tomorrow (with a bit of luck) and after I have put that in and refitted the 'Closing Panel' one of the next jobs is to refit the 'Marelli' Ignition Modules on top of the 'Closing Panel'
Do these Ignition Modules have to make 'Metal to Metal Contact' with the 'Closing Panel' and do I need to use any special sort of Conductive Compound to fit them, or just bolt them on?
If I need any special Conductive Compound, please could you give me a link.
Marelli Ignition Module
Do I need any special conductive compound to fit them (There are two of these on the Car)
I've got my Re-cored Rad coming back Tomorrow (with a bit of luck) and after I have put that in and refitted the 'Closing Panel' one of the next jobs is to refit the 'Marelli' Ignition Modules on top of the 'Closing Panel'
Do these Ignition Modules have to make 'Metal to Metal Contact' with the 'Closing Panel' and do I need to use any special sort of Conductive Compound to fit them, or just bolt them on?
If I need any special Conductive Compound, please could you give me a link.
Marelli Ignition Module
Do I need any special conductive compound to fit them (There are two of these on the Car)
#2
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orangeblossom (08-11-2016)
#3
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orangeblossom (08-11-2016)
#5
#6
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I person I trust says this stuff is the cat's meow for automotive modules
https://www.amazon.com/Arctic-Silver.../dp/B000OGX5AM
Never tried, personally. But I'll probably get some
Cheers
DD
https://www.amazon.com/Arctic-Silver.../dp/B000OGX5AM
Never tried, personally. But I'll probably get some
Cheers
DD
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orangeblossom (08-12-2016)
#7
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orangeblossom (08-12-2016)
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#8
I person I trust says this stuff is the cat's meow for automotive modules
https://www.amazon.com/Arctic-Silver.../dp/B000OGX5AM
Never tried, personally. But I'll probably get some
Cheers
DD
https://www.amazon.com/Arctic-Silver.../dp/B000OGX5AM
Never tried, personally. But I'll probably get some
Cheers
DD
Cheers, I will get some but out of interest what did you use.
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Jonathan-W (08-16-2016)
#9
Cheers but the Modules don't appear to be sitting on a Heatsink like a Cpu would do in a Computer.
They just bolt onto the Closing Panel, which as far as I can tell has no heat dissipation properties whatsoever.
If they sat on a bar of Copper, then I could understand it but they just bolt onto the Closing Panel.
Just Curious that's all and wondering what others have used if anything, when refitting these Modules.
#10
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orangeblossom (08-12-2016)
#11
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orangeblossom (08-12-2016)
#12
#13
That is interesting
I'm just starting to wonder if the Aluminium Heat sink that you mentioned, is already attached to the Ignition Modules?
Can you tell from the Photo?
#14
Yes it is... As I said, they need to sink the hat into the metal plate (not the rad bracket) underneath. Cooper Paste CAN be enough... If you haven't got anything else in your reach.
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orangeblossom (08-12-2016)
#15
That is only the module in your pic. The heat sink is somewhat larger than the module and a simple rectangle. There are traces of paste in that pic so maybe the heat sinks are still attached to radiator panel. Module attaches to heat sink with machine screws and then heating attaches to panel with self tappers into speed nuts.
Last edited by baxtor; 08-12-2016 at 06:27 AM.
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orangeblossom (08-12-2016)
#16
That is only the module in your pic. The heat sink is somewhat larger than the module and a simple rectangle. There are traces of paste in that pic so maybe the heat sinks are still attached to radiator panel. Module attaches to heat sink with machine screws and then heating attaches to panel with self tappers into speed nuts.
You Nailed It!
I've got Two closing panels one of which I could not find up until just now, buried under Jag Spares in the Shed.
Since this Car has been out of action for the best part of 17 years, I mistakenly thought both Panels were the same. (but they are not)
The one that I was trying to fit was from a 'Lucas Car' that doesn't have that type of ignition module.
Unlike the one that I just found that has Two big Aluminium Heat Sinks attached by those screws you mentioned.
And you were also right about the Residue of the Thermal Paste on the Ignition Modules.
The Rad has also turned up now, so progress can be made.
Thanks for your help.
OB
#17
You do not need thermal compound between the aluminium and rad support, only between the module and the aluminium. Make sure the surfaces are clean, use Isopropyl Alcohol to clean both surfaces, and apply a liberal amount of compound to one surface, you want it ooze out slightly.
I would not use copper grease, it may work, but 35years of fixing electronics I have not used copper grease. I would use the correct compound.
These early ignition modules DO NOT have thermal protection like the new ones do, so if you do overheat it you will be replacing it.
I do not know if the Marelli ECU varies the dwell time at low RPM (probably not) so the modules will run hottest at low RPM.
I would not use copper grease, it may work, but 35years of fixing electronics I have not used copper grease. I would use the correct compound.
These early ignition modules DO NOT have thermal protection like the new ones do, so if you do overheat it you will be replacing it.
I do not know if the Marelli ECU varies the dwell time at low RPM (probably not) so the modules will run hottest at low RPM.
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orangeblossom (08-15-2016)
#18
You do not need thermal compound between the aluminium and rad support, only between the module and the aluminium. Make sure the surfaces are clean, use Isopropyl Alcohol to clean both surfaces, and apply a liberal amount of compound to one surface, you want it ooze out slightly.
I would not use copper grease, it may work, but 35years of fixing electronics I have not used copper grease. I would use the correct compound.
These early ignition modules DO NOT have thermal protection like the new ones do, so if you do overheat it you will be replacing it.
I do not know if the Marelli ECU varies the dwell time at low RPM (probably not) so the modules will run hottest at low RPM.
I would not use copper grease, it may work, but 35years of fixing electronics I have not used copper grease. I would use the correct compound.
These early ignition modules DO NOT have thermal protection like the new ones do, so if you do overheat it you will be replacing it.
I do not know if the Marelli ECU varies the dwell time at low RPM (probably not) so the modules will run hottest at low RPM.
Do I need Thermal Paste that Conducts Heat but NOT Electricity
Or Thermal Paste that Conducts Heat AND Electricity?
Last edited by orangeblossom; 08-15-2016 at 08:47 AM.
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