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Bill_F
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Joined: Apr 17, 2005
Posts: 891
Location: New Hampshire
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 Posted: Mon Jun 18, 2012 4:14 pm Post subject: Coil problems |
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| Before I spend money on another coil what can cause them to keep going bad. The coil I had in my jeep since I restored it decided to go last week. It was one of the overseas units. I then got a take out original from an m151. It worked for a couple of days but it also seems to be no good now. Any ideas? |
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capescw
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Joined: May 14, 2012
Posts: 150
Location: Milford CT
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| Posted: Mon Jun 18, 2012 7:25 pm Post subject: |
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| Newbie to the mjeep world, but ignition coils in earlier vehicles typically have a dropping resistor (white porcelain) in series with the power lead to limit current, sometimes bypassed while starting. Shorted or defective could cause extreme heating. |
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Bill_F
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Joined: Apr 17, 2005
Posts: 891
Location: New Hampshire
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| Posted: Mon Jun 18, 2012 8:03 pm Post subject: |
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| mjeeps do not have those |
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capescw
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Joined: May 14, 2012
Posts: 150
Location: Milford CT
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Bill_F
Member
Joined: Apr 17, 2005
Posts: 891
Location: New Hampshire
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| Posted: Mon Jun 18, 2012 8:18 pm Post subject: |
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| my jeep is all stock |
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wesk
Site Administrator
Joined: Apr 04, 2005
Posts: 16262
Location: Wisconsin
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| Posted: Mon Jun 18, 2012 11:17 pm Post subject: |
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Coils generally fail due to heat.
Heat from an enclosed, un-ventillated distributor such as found on M series jeeps when the vent plumbing is not connected or not connected correctly.
Heat from the power being left on with the engine not running and the points closed.
Heat from a too high charging system voltage, IE higher than 28.5.
Heat from an abnormally hot engine compartment, IE water temps too high, timing advanced to far, or poor air flow.
Imported coils seem to generally have shorter lives.
Used, as removed coils can be very young or very old.
In the case of your M151 used coil it may have been very old.
_________________
Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
Last edited by wesk on Tue Jun 19, 2012 8:07 am; edited 1 time in total |
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Bill_F
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Joined: Apr 17, 2005
Posts: 891
Location: New Hampshire
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| Posted: Tue Jun 19, 2012 4:53 am Post subject: |
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| Everything is hooked and correct. I need to get it running again so I can check the voltage |
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