Speaking of glow plugs....

I did them just over a year ago (when I checked my timing chain).
Values were very good, little adjustment req'd.
AJ
UP HERE in the great white north (Molson, beavers, etc.)
 >> Stay informed about: Speaking of glow plugs.... 

Oh Yes????? Freely accessable?

DAS

For direct contact replace nospam with schmetterling
---

<ajewett.DeleteThis@sympatico.ca> wrote in message
news:1134137744.718232.84120@f14g2000cwb.googlegroups.com...

[...]
> ...beavers, etc.)
>
 >> Stay informed about: Speaking of glow plugs.... 

If the engine has done > 250K miles / 400K Km a compression check may be
in order - nothing lasts forever, not even a M-B.
Meanwhile, suggest you glow it multiple times before cranking the cold
engine.
 >> Stay informed about: Speaking of glow plugs.... 

I have a similar problem on my wife's '81 240D. It simply wouldn't start for
her the other morning so I pumped on the fuel pump a few times and it
started right off. Thought the problem might be the secondary fuel filter so
I drove it around to my shop, changed the filter, pumped fuel till the
injectors squeaked, started it up and drove it back to my wife's parking
spot, .1 miles. Next morning it refused to fire even once and this car
always starts with a two second glow plug heat up and a touch of the key.
Finally pulled the cover off the glow plug relay and the 80 amp fuse was
blown. Drove my 300D to the dealer, bought two new ones and put the first
one in. Tried to start with no success. Checked the new fuse link and it was
gone as well. Did like the manual says and checked out the various terminals
on the glow plug relay after pulling the connector plugs. Wasn't exactly
sure which terminal they were referring to as #1 but assumed it was the one
marked 15. Anyway, that terminal had only about .75 volts rather than the
12+ required. Assumed the problem was the relay, pulled it off, removed the
four screws holding the top on but didn't notice anything that would
indicate a really fried board. However, it did smell like it had absorbed a
lot of heat at one time or another but feel that might be normal for a unit
that has this much amperage run through it.
Anyway, my next step is to install another relay to see if that solves the
problem but was wondering what, besides the relay, would cause the fuse link
to go so quickly. Any takers?

<ajewett RemoveThis @sympatico.ca> wrote in message
news:1134092794.600545.295170@z14g2000cwz.googlegroups.com...
> My old Benz (1980 300TD) is giving me a bit of grief starting up as
> winter approaches. New starter and battery 3 yrs ago, all new plugs as
> well. I just checked the resistance on them via the relay plug, and
> they all read 0 to 0.6 ohms. Should I replace them based on age, or
> should I continue running with them and look at other things? I've
> only put about 30K miles on the car since all of those things were
> replaced. Any advice would be appreciated,
> AJ
> The Great White North
>
 >> Stay informed about: Speaking of glow plugs.... 

How good is the battery?

If it was weak would the amps through the link increase?
 >> Stay informed about: Speaking of glow plugs.... 

T.G. Lambach wrote:
> How good is the battery?
>
> If it was weak would the amps through the link increase?

The battery was changed 2.5 years ago, to a new Interstate. The
starter was changed at the same time.
AJ
 >> Stay informed about: Speaking of glow plugs.... 

You wrote that the glow plugs' resistance was between 0 and .6 ohms.
Zero implies an open circuit, doesn't it?

The GPs may have failed if these are other than Bosch or Beru GPs, even
in their relatively short mileage use.

The Berus are good for 100K miles, in my experience with my '80 300SD.
 >> Stay informed about: Speaking of glow plugs.... 

T.G. Lambach wrote:
> You wrote that the glow plugs' resistance was between 0 and .6 ohms.
> Zero implies an open circuit, doesn't it?
>

Oops, T.G.

Open = "infinite" ohms. Short = "zero" ohms.


> The GPs may have failed if these are other than Bosch or Beru GPs, even
> in their relatively short mileage use.
>

If it is shorted, it will probably blow the fusible link.

> The Berus are good for 100K miles, in my experience with my '80 300SD.

Cheers,
WS
 >> Stay informed about: Speaking of glow plugs.... 

"I would pull out the GPs and wire brush the tip every year. While
they are
out, it is a good time to measure the resistance. Failure mode is
usually
open (high impedance). After moving to California, didn't do that for
many
years. One year the car wouldn't start again and I pull the GPs out, 2
were
open and 2 have high impedance."

Maybe I'm just lucky, but I never have done anything to mine and am
only on my second set in a 25 year old car.
 >> Stay informed about: Speaking of glow plugs.... 

ajewett RemoveThis @sympatico.ca wrote:
>My old Benz (1980 300TD) is giving me a bit of grief starting up as
>winter approaches. New starter and battery 3 yrs ago, all new plugs as
>well. I just checked the resistance on them via the relay plug, and
>they all read 0 to 0.6 ohms. Should I replace them based on age, or
>should I continue running with them and look at other things? I've
>only put about 30K miles on the car since all of those things were
>replaced. Any advice would be appreciated,
>AJ
>The Great White North

I would pull out the GPs and wire brush the tip every year. While they are
out, it is a good time to measure the resistance. Failure mode is usually
open (high impedance). After moving to California, didn't do that for many
years. One year the car wouldn't start again and I pull the GPs out, 2 were
open and 2 have high impedance. So one one GP was working.
 >> Stay informed about: Speaking of glow plugs.... 

I just bought a set of 5 and am going to change them all....will let
you know how things work out.
AJ
 >> Stay informed about: Speaking of glow plugs....