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  #1  
Old 01-26-2007, 01:09 PM
SwampYankee's Avatar
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123 Owner's Manual-Winter Starting Instructions (1980)

Since there have been a number of cold weather starting posts, it piqued my interest enough to go read what my Owner's Manual actually said. While I've owned diesels before, I am a vintage Benz diesel newbie. That said, this is for the 1980 model year. Whether or not newer 123's are the same, I don't know. Not yet, but I will So for any newbie without a manual and were curious as to how MB recommended winter starts, I offer this:

With the engine cold, depress accelerator halfway and turn idle speed adjuster counterclockwise to the stop. Then release accelerator.

Turn key in steering lock to position "2" (run position). Charge indicator and preglowing indicator lamp must come on.

The preglowing process then begins. The engine can be started as soon as the preglowing indicator lamp has gone out. Since the glowplugs continue glowing for up to 1 minute, the engine can be restarted during this period without preglowing again.

Turn the key to the stop to start the engine. Release the key only when the engine fires regularly.

When the engine is at operating temperature (coolant temperature above approximately +70*C/+158*F), the preglowing indicator lamp comes on only briefly. The engine can be started immediately.

At ambient temperatures below 0*C/32*F and with the engine cold, completely depress the accelerator while starting. Actuate starter until the engine fires regularly and the engine speed rises. Then ease off the accelerator slowly. Cranking times of up to one minute will not do any harm to the starter.

At ambient temperatures of less than -20*C/-4*F, depress the accelerator three times prior to starting.

Idle Speed Adjustment:

Turn idle speed adjuster clockwise until the engine will just run smoothly. The idle speed adjuster should be turned clockwise to the stop (normal position) at latest when the coolant has reached a temperature of +60*C/+140*F.

I hope that helps someone.
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1980 300TD-China Blue/Blue MBTex-2nd Owner, 107K (Alt Blau) OBK #15
'06 Chevy Tahoe Z71 (for the wife & 4 kids, current mule) '03 Honda Odyssey (son #1's ride, reluctantly) '99 GMC Suburban (255K+ miles, semi-retired mule) 21' SeaRay Seville (summer escape pod)
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  #2  
Old 01-26-2007, 01:15 PM
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Quote:
Originally Posted by SwampYankee View Post
At ambient temperatures of less than -20*C/-4*F, depress the accelerator three times prior to starting.
REEEELLy?
according to the "flood diesel" thread, pumping does nothing... who is correct?
John
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #3  
Old 01-26-2007, 01:28 PM
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Quote:
Originally Posted by vstech View Post
REEEELLy?
according to the "flood diesel" thread, pumping does nothing... who is correct?
John
Verbatim.

I was surprised when I read that, too. I wonder what the three pumps do? Help prime the injectors given the thicker fuel?

I'm guessing MB is correct in their manual? Maybe it's one of those German->English translation things. Similar to Chinese->English except without humor.
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1980 300TD-China Blue/Blue MBTex-2nd Owner, 107K (Alt Blau) OBK #15
'06 Chevy Tahoe Z71 (for the wife & 4 kids, current mule) '03 Honda Odyssey (son #1's ride, reluctantly) '99 GMC Suburban (255K+ miles, semi-retired mule) 21' SeaRay Seville (summer escape pod)
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  #4  
Old 01-26-2007, 01:43 PM
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Maybe it gives the injector pump a kick in the pants to loosen up the governor parts in verrrry cold weather.
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  #5  
Old 01-26-2007, 01:44 PM
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I don't have an idle speed knob, its in a picture in my manual, but I don't see one in my car. Also, if I crank the car and it doesn't start, I have to take the key completely out, then there's a click, then I can try cranking again.

Everything else I follow the instructions and it seems to start fairly well in the cold. I would like to get my block heater working though...anyone have the diesel giant lower hose heater? Does it heat the coolant just as well as the original heater?
Thanks,
-Geoff
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  #6  
Old 01-26-2007, 02:03 PM
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An idle speed knob sounds great. Is there one hidden somewhere in an '83 300SD? What does it look like and where is it supposed to be?

BTW. It was 12*F overnight and about 20*F this morning when I started my car. Took two tries, but if I kept it going the first time it probably would have started after about 10 seconds of cranking. Not plugged in, not bad.

I remember when I was a kid I had a friend who "knew about cars" that told me people with diesels had to go outside on cold mornings with blowdryers to get their cars started.
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  #7  
Old 01-26-2007, 02:04 PM
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chef, while your thinking of it, click on the 'User CP' tab above then go to the 'Edit Signature' tab and put your vehicle info. into your sig so that those-in-the-know can help you with your questions (of which I'm not one ). Some may be model specific.

Seems like quite a few have the lower hose heater and are happy with it.
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1980 300TD-China Blue/Blue MBTex-2nd Owner, 107K (Alt Blau) OBK #15
'06 Chevy Tahoe Z71 (for the wife & 4 kids, current mule) '03 Honda Odyssey (son #1's ride, reluctantly) '99 GMC Suburban (255K+ miles, semi-retired mule) 21' SeaRay Seville (summer escape pod)
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  #8  
Old 01-26-2007, 02:22 PM
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Quote:
Originally Posted by JimZ View Post
An idle speed knob sounds great. Is there one hidden somewhere in an '83 300SD? What does it look like and where is it supposed to be?
Nope... supposedly automatic, but my 82 needs my foot on cold mornings to keep it happy...
John
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #9  
Old 01-26-2007, 02:35 PM
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Turbos dont have the idle adjuster and dont (shouldnt) need it. Only NA have it.
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  #10  
Old 01-26-2007, 02:45 PM
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yea i was shocked when i got my 300D turbo, since its my winter car i thought id use the idle speed knob more than in my 240D. but when i got it, i saw that it didnt have one but the idle speed knob is right underneath the gauge cluster to the left of the steering wheel
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  #11  
Old 01-26-2007, 03:03 PM
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Quote:
Originally Posted by winmutt View Post
Turbos dont have the idle adjuster and dont (shouldnt) need it. Only NA have it.
See, learnin' already!
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1980 300TD-China Blue/Blue MBTex-2nd Owner, 107K (Alt Blau) OBK #15
'06 Chevy Tahoe Z71 (for the wife & 4 kids, current mule) '03 Honda Odyssey (son #1's ride, reluctantly) '99 GMC Suburban (255K+ miles, semi-retired mule) 21' SeaRay Seville (summer escape pod)
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  #12  
Old 01-26-2007, 04:12 PM
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Quote:
Originally Posted by SwampYankee View Post
chef, while your thinking of it, click on the 'User CP' tab above then go to the 'Edit Signature' tab and put your vehicle info. into your sig so that those-in-the-know can help you with your questions (of which I'm not one ). Some may be model specific.

Seems like quite a few have the lower hose heater and are happy with it.
Done...but I guess it isn't retroactive on prior posts...we'll see when this one goes through...

So, anyone have the Diesel Giant lower radiator hose? Is it awesome? Heat the engine sufficiently?
-Geoff
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1974 240D (1?)52,000 mi - has a new home now
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