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  #1  
Old 09-20-2004, 11:41 PM
1985 300SD Sady's Avatar
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Join Date: Sep 2004
Location: Cincinnati, Ohio
Posts: 1,038
26.7 Vdc????

just did a complete engine swap and im trying to get her started,

I had to order the new bosch primer pump, b/c the old one leaked. I think this could be my problem.

Anyway, i was cranking on her today, b/c someone said it took him a total of 4to5 minutes of cranking and a battery charge to get his started after a swap. After a few times of cranking her over, i began to hear the starter begin to slow, and i figured id need to put the charger on it, but first i checked the voltage... 26..7 VDC?? how could it be, i checked it yesterday and it was at 12.2 ?? i hadnt put the charger on it yet..? anyone know what this is??

Also, the GP light (i think) doesnt come on.. Is this the one that looks simular to a spring??

I voltage tested the GP's and i couldnt get anything, could this be contributing to no starting??

Any suggestions would be greatly appreciated.

Thanks.

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  #2  
Old 09-21-2004, 11:46 AM
Hatterasguy's Avatar
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Join Date: Nov 2002
Location: Milford, CT
Posts: 19,318
I would change the glowplugs, or if you dont think they are heating up try this. DON'T BURN YOURSELF!!!! Take one out and turn the key to the glow position and see if it gets hot. But the engine should start without them.
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  #3  
Old 09-21-2004, 12:18 PM
mb123mercedes
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Look for the pre-glow relay.

There is a strip fuse(strip of metal) in it.
The fuse could be blown.

On the w123 it is on the driverside fender under
the hood.

Edit:Sorry, forgot to add that you have a w126 and I
don't know where it is located for that model.

Louis.
Attached Thumbnails
26.7 Vdc????-relay.jpg   26.7 Vdc????-relay-kit.jpg  

Last edited by mb123mercedes; 09-22-2004 at 10:31 AM.
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  #4  
Old 09-22-2004, 09:05 AM
TonyFromWestOz's Avatar
"The Wizard of Oz"
 
Join Date: Jan 2004
Location: Perth, Western Australia
Posts: 834
Quote:
Originally Posted by 1985 300SD Sady
just did a complete engine swap and im trying to get her started,

I had to order the new bosch primer pump, b/c the old one leaked. I think this could be my problem.

Anyway, i was cranking on her today, b/c someone said it took him a total of 4to5 minutes of cranking and a battery charge to get his started after a swap. After a few times of cranking her over, i began to hear the starter begin to slow, and i figured id need to put the charger on it, but first i checked the voltage... 26..7 VDC?? how could it be, i checked it yesterday and it was at 12.2 ?? i hadnt put the charger on it yet..? anyone know what this is??
When you checked it yesterday, was it connected to the Mains?, the Battery? Was it turned on?
Does it have a 12v/24v switch, for charging truck batteries?
12.2V is too low to charge a 12v battery, which normally sits at 12.6v when sitting idle, up to 15v shortly after starting and 13.6 v when the car has been running for a while. A battery charger usually provides up to 17V open circuit for the 12v setting.
Quote:

Also, the GP light (i think) doesnt come on.. Is this the one that looks simular to a spring??

I voltage tested the GP's and i couldnt get anything, could this be contributing to no starting??

Any suggestions would be greatly appreciated.

Thanks.
Hope this helps, bot please provide more information if you want more than a general reply.
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Tony from West Oz.
Fatmobile 3 84 300D 295kkm Silver grey/Blue int. 2 tank WVO - Recipient of TurboDesel engine.
Josephine '82 300D 390kkm White/Palamino int.
Elizabeth '81 280E, sporting a '79 300D engine.
Lucille '87 W124 300D non-turbo 6 cylinder OM603, Pearl Grey with light grey interior


Various parts cars including 280E, 230C & 300D in various states of disassembly.

Last edited by TonyFromWestOz; 09-23-2004 at 08:13 AM. Reason: remedy typo
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  #5  
Old 09-22-2004, 12:16 PM
1985 300SD Sady's Avatar
Star Crazy
 
Join Date: Sep 2004
Location: Cincinnati, Ohio
Posts: 1,038
the tester was hooked up to the battery, but yesterday when i checked it was back down to 12.6 so, i think im alright, but the gp light???

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