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  #1  
Old 11-23-2018, 02:23 AM
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Om617 loop spiral to pencil

Hi, I want to convert loop spiral to pencils as today I want to move my 300D and had a hard start (three cycles to start).

I want to keep the time of the original relay and will use a second relay to put more amps through the plugs.

Is this diagram safe to use ?



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  #2  
Old 11-23-2018, 03:17 AM
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Not possible to convert to pencil plugs and pencil relay? I think even the glow plug relay is a separate section from the main harness.

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02 C320 wagon
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  #3  
Old 11-23-2018, 03:44 AM
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The point of the original Mercedes system is partly to protect the plugs - there's a chance you'll burn them out if you start using them for long than intended.

If you are having a rough time getting the engine started have a look at the condition of the engine oil (fresh oil always helps), the health of the starter (a rebuilt starter spins faster) and if necessary consider fitting a block heater.

I feel compelled to add that In most (weather) situations in the Netherlands I've never had trouble starting my OM617 (or any other vehicle)
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  #4  
Old 11-23-2018, 04:40 AM
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Quote:
Originally Posted by Stretch View Post
The point of the original Mercedes system is partly to protect the plugs - there's a chance you'll burn them out if you start using them for long than intended.

If you are having a rough time getting the engine started have a look at the condition of the engine oil (fresh oil always helps), the health of the starter (a rebuilt starter spins faster) and if necessary consider fitting a block heater.

I feel compelled to add that In most (weather) situations in the Netherlands I've never had trouble starting my OM617 (or any other vehicle)
All done except glow spirals and injectors.
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  #5  
Old 11-23-2018, 06:00 AM
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My '78 uses the stock setup with no problems except the glow timer doesn't shut off until you engage the starter so I wouldn't worry about an extra relay myself.

PS They're a loop not a spiral and these same questions seem to come up every couple weeks so a search would help you out
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  #6  
Old 11-23-2018, 09:29 AM
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I doubt the pencil relays aren’t going to draw 120a, and your relay coil isn’t going to draw 80a. You need to install an appropriate fuse on the 30/87 run for this to even be safe. It doesn’t seem that your added relay has any purpose.
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  #7  
Old 11-23-2018, 10:32 AM
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Post Cold Weather Starting Drill

? When was the last time you adjusted the valves ? .

This is the # 1 cause of hard Winter starting .
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Old 11-23-2018, 10:43 AM
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Been measured (only one adjusted)

these pencils draw 15A each instead of 10A so relay cant handle it I guess.
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  #9  
Old 11-23-2018, 07:50 PM
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If this is for a w115 300D the only issue I see is with the thermo time switch not being in the loop somewhere to tell you when the plugs are hot enough. It acts as the ground for the loop glow plugs in the original system.



Perhaps it could be connected to terminal 85 in your diagram? There are two connections on the switch, one for the original plugs and the other is for the gp light in the dash. I would connect the one for the plugs to 85
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  #10  
Old 11-24-2018, 12:43 AM
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the original thermoswitch on the block will be used (attached to the old relay)
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  #11  
Old 11-24-2018, 09:20 AM
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Quote:
Originally Posted by jsp300D View Post
Been measured (only one adjusted)

these pencils draw 15A each instead of 10A so relay cant handle it I guess.
So you need a 100a fusable link in place of the 150. And your 85/86 coil draws maybe 1a, so a small fuse there. Where did you find a 120a relay?

Last edited by Mxfrank; 11-24-2018 at 11:58 AM.
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  #12  
Old 11-24-2018, 11:07 AM
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The standard for years has been to use the old ford starter relay that bolts to the side fender apron. Both cheap and reasonably reliable. Still available easily as well but this may pass with time.

Did I forget to mention cheap and normally deals with the full current in a ford starter? Actually I have never heard of a reasonable alternative to them.
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  #13  
Old 11-24-2018, 12:00 PM
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Quote:
Originally Posted by barry12345 View Post
The standard for years has been to use the old ford starter relay that bolts to the side fender apron. Both cheap and reasonably reliable. Still available easily as well but this may pass with time.

Did I forget to mention cheap and normally deals with the full current in a ford starter? Actually I have never heard of a reasonable alternative to them.
Ford starter solenoid would have been my choice. But he’s showing something with DIN terminal designations, thus the question.
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  #14  
Old 11-25-2018, 12:25 AM
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Exclamation Glow Plug Control

Jeeze ;

Don't screw around with barnyard starter relay bodge repairs ~ fix the darn thing properly, there's myriad posts on how to do this using cheap junkyard parts .
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1982 240D creampuff 370,000 miles
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1984 300CD KEEPER ! 440,XXX miles
1984 Euro 300TD Fully optioned SWMBO's
1974 350SLC 4 speed stickshift SOLD & missed
Krazy Kommie Ural Motos (3)
BMW Moto R60/6 Barn Find, 8,000miles
1959 VW #113 Deuxe Beetle, 36hp engine, stock
Junk, Rust, Arthritis, Crushed Spine,Broken Neck&Back
Memories, Peace Of Mind
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  #15  
Old 11-25-2018, 10:01 AM
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I want to keep the original relay to use it as a timer.


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