For what it's worth I am going to weigh in again on this issue of replacing electrical parts that aren't bad.
Here is my take on the matter - DON'T DO IT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
It is a waste of time and effort. Let me explain using an example from the field of electronics.
When an integrated circuit manufacturer runs a batch of logic chips they are all tested before they are put into those funny centipede looking packages. And of course some of them fail and are never packaged. Once packaged they are expected to conform to the specifications in the book for things like range of operating temperatures, range of voltages, propagation delays etc. Some manufacturers test their chips after packaging and usually a few more will fall out.
Enter the military. The military demands chips with a wider range of temperatures, a wider range of voltages without damage to the chip, and usually faster propagation times, among other parameters. Now there are not separate processes for making military chips vs civilian chips. They simply expose a batch of chips to the military extremes of temperature and voltage and require them to perform faster under those extremes. And a certain percentage will fail. The remaining ones that pass are marked with the mil spec labeling and are sold for a premium.
My point is that there is no difference between the mil spec chips and the standard chips except for the pure chance that some will survive the harsher testing. Those that survive are stronger than the rest - precisely because they survived.
The point is that the longer a glow plug (or any electrical part) survives, the longer it is likely to survive. It's a stronger part. It's just chance that it got built that way. But if it has not blown out then it is surviving. The construction methods are not so exacting that it can be predicted to the minute when it will fail. They are just good enough to warrant that they will last at least so long. It's a minimum. And there is no maximum.
For example, I haven't replaced a glow plug in my 81 wagon in 3 years now. And I had to replace two.
Before that it was 2 more years. I replaced two of them at that time as well.
Here is my take on the matter - DON'T DO IT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
It is a waste of time and effort. Let me explain using an example from the field of electronics.
When an integrated circuit manufacturer runs a batch of logic chips they are all tested before they are put into those funny centipede looking packages. And of course some of them fail and are never packaged. Once packaged they are expected to conform to the specifications in the book for things like range of operating temperatures, range of voltages, propagation delays etc. Some manufacturers test their chips after packaging and usually a few more will fall out.
Enter the military. The military demands chips with a wider range of temperatures, a wider range of voltages without damage to the chip, and usually faster propagation times, among other parameters. Now there are not separate processes for making military chips vs civilian chips. They simply expose a batch of chips to the military extremes of temperature and voltage and require them to perform faster under those extremes. And a certain percentage will fail. The remaining ones that pass are marked with the mil spec labeling and are sold for a premium.
My point is that there is no difference between the mil spec chips and the standard chips except for the pure chance that some will survive the harsher testing. Those that survive are stronger than the rest - precisely because they survived.
The point is that the longer a glow plug (or any electrical part) survives, the longer it is likely to survive. It's a stronger part. It's just chance that it got built that way. But if it has not blown out then it is surviving. The construction methods are not so exacting that it can be predicted to the minute when it will fail. They are just good enough to warrant that they will last at least so long. It's a minimum. And there is no maximum.
For example, I haven't replaced a glow plug in my 81 wagon in 3 years now. And I had to replace two.
Before that it was 2 more years. I replaced two of them at that time as well.
Go back two more years and I replaced three.
You can't tell up front how long a plug will last - that is a function of time. But as time went on I eventually had a full set of above average (or mil spec, if you will) plugs. Eventually the weakest of them may go out and the replacement for it may or may not be as strong. But sooner or later that hole will have a plug that is above average. It may not be the first one I put in. But eventually . . . the statistics are in my favor. But if I replace them all because one blows out then I may well be replacing 4 superior parts with, say, 3 inferior ones and 1 superior one. The superior ones will work forever. But the only way to tell is to let them prove themselves.
Try this - keep a record of the plugs that go bad and when you replace them. But only replace the ones that go bad.
Eventually you will see that certain plugs have not had to be replaced in a long time. Those are the ones you have proven over time by the standard stresses of daily use and they have survived. For me it's been at better than 3 years since I have replaced a plug. It's actually pushing 4.
But if you insist on replacing them all and want to sell the good ones you pulled, I will consider buying them. I would rather buy well tested parts than take a chance on a new one that may not last a year.
Bogy
On Tuesday, January 14, 2014 1:51 PM, brian's 83 300d's <bstromsoe@yahoo.com> wrote:
PS - Replacing only the #1 cylinder glow plug solved the starting issue. Now I just have to decide whether I want to replace the other 4 or wait until I get another dead one.
--- In diesel_mercedes@yahoogroups.com, <vwnate1@...> wrote:
>
>
> Smart man Brian ! .
>
> Occasionally I'll push after the pain and I always suffer when I do .
>
> Take it slow and easy , once you don't rush , the job gets easier and faster too .
>
> -Nate
>
>
>
>
> Brian Wrote :
>
> I had forgotten what a wonderful adventure it is to get my big fat hands down into those little itty bitty spaces. Finished #1 and did not drop anything. That is an accomplishment. Might do #2 this afternoon or tomorrow. I'm like Nate, I quit when my back hurts.
>
> brian from la verne
>
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--- In diesel_mercedes@yahoogroups.com, <vwnate1@...> wrote:
>
>
> Smart man Brian ! .
>
> Occasionally I'll push after the pain and I always suffer when I do .
>
> Take it slow and easy , once you don't rush , the job gets easier and faster too .
>
> -Nate
>
>
>
>
> Brian Wrote :
>
> I had forgotten what a wonderful adventure it is to get my big fat hands down into those little itty bitty spaces. Finished #1 and did not drop anything. That is an accomplishment. Might do #2 this afternoon or tomorrow. I'm like Nate, I quit when my back hurts.
>
> brian from la verne
>
------------------------------------
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