Jim wrote:<<I don't know what you mean about the 'feel' of 4 GP's>>
should have said it feels like its running on 4 cylinders out of 5.
Also -when I tested the GPs with my Bat Chgr I should have mentioned it has
a gauge on it - it was pegged at 15 amps on each trial. Don't know how
accurate the gauge is - the charger is 20 years old. So I was able to test
GP dc current draw after all - sort of. But I guess with it pegged it's not
telling me much. BTW, I searched for a DMM that reads dc current to 30a or
so and no one had them. I'll order one though.
Marshalls suggestion about the TSB comment to cycle the relay to try and
revive it is worth a try unless MB agrees to replace it - it's only 4-5
weeks old after all. I'll try to keep the battery from dieing. Also, I
need to put a light on the GPs and see how many seconds they're staying on
when cold. We're getting mid 30'sF in the morning so I should get a lengthy
glow.
I have to go to the dealer anyway to get the correct intake man gasket -
they gave me a 6 cyl one by mistake.
BTW, the wiring harness is in great condition - the car has 115000 babied
miles on it and everything I come across as I work my way thru maint. items
looks like its been well cared for or original.
Thanks for everyong help -
Larry T (67 MGB, 74 911, 78 240D, 91 300D)
www.youroil.net for Oil Analysis and Weber Parts
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.
----- Original Message -----
From: "Jim Cathey" <[EMAIL PROTECTED]>
To: "Mercedes Discussion List" <mercedes@okiebenz.com>
Sent: Sunday, November 26, 2006 3:24 PM
Subject: Re: [MBZ] GP Infant Mortality
tested them by attaching each in turn to a Batt chgr and all glowed
red hot
at the tip within ~12 sec. from the chart in the book that's pretty
good -
of course, they're all only about 4 weeks old.
That sounds good. A plug can still get hot yet draw out-of-spec
current, possibly enough to PO the GP relay. But if all five acted
exactly the same the chances of this are lessened.
Ok, the relay was replaced 4 weeks ago also after it failed to light
up the
GPs one night when my wife wanted to come home. A new replay gets the
GPs
to light but the light goes out within 1 sec (about 1/5 sec) and it
feels
like only 4 GPs are preglowing.
The light is hooked to a temperature-sensitive timer. The GP's are
hooked to a _different_ timer. They have nothing to do with each other,
except that both are started with the key. If all five GP's do not
heat up, and stay heating for something like 90+ seconds before
automatically cutting off, then the GP relay is defective.
With good GP's, if the light does not obey the ambient temperature/time
curve that's in the (some, anyway) manuals, then it is defective.
I don't know what you mean about the 'feel' of 4 GP's.
What do you think? Should I just button things up?
If we have definitively diagnosed the relay, yes. Unless you want
to dive into the relay's guts to try to repair it. Bad for warrantee
issues, and you risk making things worse too. If you still have your
old one, of course...
There was a TSB about cycling a preglow relay that exhibited
foreshortened intervals about 10-12 times in a row (turn on the glow
plugs and allow them to remain on until the relay cut off - and repeat
10-12 times - will likley run the battery down, but MAY revive the
relay
and timing MAY return to normal). This TSB (early/mid '80s as I
recall)
referred to new and used preglow relays that exhibited short timing
intervals after being stored and not used for months or years.
This is SOP for reforming an electrolytic capacitor, since the days
of vacuum tubes. It doesn't always work, of course, but is worth
a try. To save your battery just unplug the GP harness. The timers
should still do their cycling, which should do any possible reformation
during that time.
To _really_ reform a cap, you need to take it out of circuit.
At that point, of course, you'd just replace it.
-- Jim
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