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Oxidised HT Leads
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CarGuru > Open discussion > Oxidised HT Leads 27 April 2005 00:33:42
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Oxidised HT Leads

Matt F 26 April 2005 02:01:39
 Hi All

Just Changed the HT leads on My Mondeo as the old ones had done about 30K
and I noticed a couple of the leads had oxidised terminals at the coil end
This was also present on the corresponding terminals on the coil itself.

The car runs fine and seems smoother through acceleration but I was just
curious why 2 of the terminals had furred up and 2 are still clean as a
whistle.

Any ideas?

Matt


Add comment
Mrcheerful . 26 April 2005 02:18:16 [ permanent link ]
 
"Matt F" <no_reply_here@blue­yonder.co.uk> wrote in message
news:7Ndbe.19601$G8­.4725@text.news.blue­yonder.co.uk...> Hi All>
Just Changed the HT leads on My Mondeo as the old ones had done about 30K > and I noticed a couple of the leads had oxidised terminals at the coil end > This was also present on the corresponding terminals on the coil itself.>
The car runs fine and seems smoother through acceleration but I was just > curious why 2 of the terminals had furred up and 2 are still clean as a > whistle.>
Any ideas?>
Matt>

because you actually have two double ended coils in there, therefore one end
is a positive spark, one a negative. It works in the same way that one post
of a battery oxidises and grows more crud than the other (usually the
negative)

mrcheerful


Add comment
Tim.. 26 April 2005 16:31:44 [ permanent link ]
 
"mrcheerful ." <nbkm57@hotmail.com­> wrote in message
news:I0ebe.19615$G8­.17053@text.news.blu­eyonder.co.uk...>
"Matt F" <no_reply_here@blue­yonder.co.uk> wrote in message> news:7Ndbe.19601$G8­.4725@text.news.blue­yonder.co.uk...> > Hi All> >
Just Changed the HT leads on My Mondeo as the old ones had done about
and I noticed a couple of the leads had oxidised terminals at the coil
This was also present on the corresponding terminals on the coil itself.> >
The car runs fine and seems smoother through acceleration but I was just> > curious why 2 of the terminals had furred up and 2 are still clean as a> > whistle.> >
Any ideas?> >
Matt> >
because you actually have two double ended coils in there, therefore one
is a positive spark, one a negative. It works in the same way that one
post> of a battery oxidises and grows more crud than the other (usually the> negative)>

Positive you mean!

I've yet to see a cruddy -ve lead yet!

Tim..


Add comment
Mrcheerful . 26 April 2005 16:46:42 [ permanent link ]
 
"Tim.." <the.farm.hates.spa­m@btinternet.com> wrote in message
news:d4lcbg$926$1@n­wrdmz01.dmz.ncs.ea.i­bs-infra.bt.com...>
"mrcheerful ." <nbkm57@hotmail.com­> wrote in message> news:I0ebe.19615$G8­.17053@text.news.blu­eyonder.co.uk...>>
"Matt F" <no_reply_here@blue­yonder.co.uk> wrote in message>> news:7Ndbe.19601$G8­.4725@text.news.blue­yonder.co.uk...>> > Hi All>> >
Just Changed the HT leads on My Mondeo as the old ones had done about> 30K>> > and I noticed a couple of the leads had oxidised terminals at the coil> end>> > This was also present on the corresponding terminals on the coil >> > itself.>> >
The car runs fine and seems smoother through acceleration but I was >> > just>> > curious why 2 of the terminals had furred up and 2 are still clean as a>> > whistle.>> >
Any ideas?>> >
Matt>> >
because you actually have two double ended coils in there, therefore one> end>> is a positive spark, one a negative. It works in the same way that one> post>> of a battery oxidises and grows more crud than the other (usually the>> negative)>>
Positive you mean!>
I've yet to see a cruddy -ve lead yet!>
Tim..>

Have a look at my Bedford CF then ! I couldn't remember any other vehicles
with a cruddy lead, as it is less common these days, but my CF negative
terminal is definitely growing things, while the positive is clean, perhaps
the material the clamp is made of effects the corrosion?

Either way, the variation in the ht leads of the OP is probably the result
of positive or negative spark.

best wishes
mrcheerful


Add comment
Matt F 27 April 2005 00:22:43 [ permanent link ]
 
"mrcheerful ." <nbkm57@hotmail.com­> wrote in message
news:I0ebe.19615$G8­.17053@text.news.blu­eyonder.co.uk...>>
because you actually have two double ended coils in there, therefore one > end is a positive spark, one a negative. It works in the same way that > one post of a battery oxidises and grows more crud than the other (usually > the negative)>
mrcheerful

Interesting stuff. Is there likely to be any point in attempting to remove
the oxidisation that remains on the coil terminals? As originally mentioned
the car is smoother with the new leads as things stand and i dont want to
damage the coil attempting to remove the deposits if there is little to no
point!

Thanks again.

Matt


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CarGuru > Open discussion > Oxidised HT Leads 27 April 2005 00:33:42
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