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Old 01-05-2006, 17:01   #1 (permalink)
Judith
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Re: 300Tdi - Slow start in cold weather - New glow plugs needed?

On Sat, 31 Dec 2005 17:03:54 +0000 (UTC), beamendsltd
<beamendsltd@btconnect.com> wrote:

>> Have tried a few shops but nobody seems to have any of the right type
>> (and it's New Year's Eve afternoon so most places are shutting now).
>>
>> No hurry though, as even at -3.5 deg C it was still starting
>> eventually last week.
>>
>> Thanks for helping with the diagnosis.
>>
>> Judith

>
>Ahem.


I wasn't ignoring you, Richard.

A colleague at work only managed to change two of the plugs of his
200Tdi so he's given me his spares. I reckon 2 out of 4 is better
than none so will fit them this weekend.

Judith
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Old 01-05-2006, 18:01   #2 (permalink)
EMB
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Re: 300Tdi - Slow start in cold weather - New glow plugs needed?

Judith wrote:
>
> A colleague at work only managed to change two of the plugs of his
> 200Tdi so he's given me his spares. I reckon 2 out of 4 is better
> than none so will fit them this weekend.


Don't. Get a full set. As each plug blows the current draw, and
consequently voltage drop lessens which leads to excessive voltage to
the remaining plugs causing them to either fail or have a significantly
shortened lifespan.


--
EMB
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Old 01-06-2006, 01:01   #3 (permalink)
William Tasso
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Re: 300Tdi - Slow start in cold weather - New glow plugs needed?

Judith <no.spam.for.goofif.please@aol.com> wrote:

> ...
> A colleague at work only managed to change two of the plugs of his
> 200Tdi so he's given me his spares.


Seems to be a common complaint - neighbour had a similar issue with his
car[1]. Gave up and tasked the local tech with the job of fitting the
remaining two.

[1] blue, diesel - possibly made in france
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William Tasso
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Old 01-06-2006, 03:01   #4 (permalink)
Austin Shackles
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Re: 300Tdi - Slow start in cold weather - New glow plugs needed?

On or around Fri, 06 Jan 2006 13:14:14 +1300, EMB <embtwo@gmail.com>
enlightened us thusly:

>Judith wrote:
>>
>> A colleague at work only managed to change two of the plugs of his
>> 200Tdi so he's given me his spares. I reckon 2 out of 4 is better
>> than none so will fit them this weekend.

>
>Don't. Get a full set. As each plug blows the current draw, and
>consequently voltage drop lessens which leads to excessive voltage to
>the remaining plugs causing them to either fail or have a significantly
>shortened lifespan.


not on a parallel-wired one, though? they all in theory get 12V nominal.
Mind, if the power distribution is not balanced there may be a minor effect
that the one at the end of the line gets less voltage.

The effect on battery voltage is minor, or should be, and in any case the
plugs are mean to be able to handle 12V.

There's also the point that on a TDi, 2 plugs are probably enough to make
sure that it starts...

Still good practice top replace the set though - it's like spark plugs, no
point in changing part of a set, except if one gets broken or something.

--
Austin Shackles. www.ddol-las.net my opinions are just that
"There are three sorts of people in the world - those who can count,
and those who can't" (Anon)
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Old 01-06-2006, 16:01   #5 (permalink)
EMB
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Re: 300Tdi - Slow start in cold weather - New glow plugs needed?

Austin Shackles wrote:

> not on a parallel-wired one, though? they all in theory get 12V nominal.
> Mind, if the power distribution is not balanced there may be a minor effect
> that the one at the end of the line gets less voltage.
>
> The effect on battery voltage is minor, or should be, and in any case the
> plugs are mean to be able to handle 12V.



Check the voltage rating on the glow plugs - most '12V' ones are rated
at between 7 and 11 volts. The voltage drop in the wiring brings the
voltage at the glow plug down to this level - reducing the current draw
(eg a dead plug) lessens the voltage drop and thus increases the voltage
across the remaining glow plugs.

A quick test on my Hilux this morning shows 10.2V at the glow plugs,
removing the connection to one glow plug raised this by 0.5V which has
got to lessen the lifespan of the remaining plugs.


--
EMB
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