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  #16  
Old 04-23-2010, 01:49 AM
Unofficial wormcan opener
 
Join Date: Dec 2005
Location: Ashland, MA
Posts: 2,602
Quote:
Originally Posted by compress ignite View Post
If it leaks from the "Front" it's the O-Ring.(number 149 in the Pictogram)
Easy quick FIX...
Remove the Circlip (#161)...
Remove the Cover(#155)...
R+R O-Ring (#149)...CAREFUL of the Spring (#137)

It tells you something about a "Professional" WT (Wrench Turner) who "Bypasses" the Thermostat/Heater.
It's actually a lot MORE EFFORT to Bypass rather than replace one o-ring!
X2, I replaced the O-ring on mine and that stopped the leak. I think it took 5 minutes, possibly 10 if the spring goes flying.

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  #17  
Old 04-23-2010, 02:22 AM
mommamia
 
Join Date: Dec 2007
Location: Maryland
Posts: 508
Nevertheless I replaced mine with a used one. It was a real PITA trying to remove the upper mounting bolt and a couple of hose clamps. I guess this one hadn't been touched since the original installation.
Do you guys typically remove the unit when replacing the o-ring?
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  #18  
Old 04-23-2010, 02:29 AM
Unofficial wormcan opener
 
Join Date: Dec 2005
Location: Ashland, MA
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Quote:
Originally Posted by dablk1 View Post
Nevertheless I replaced mine with a used one. It was a real PITA trying to remove the upper mounting bolt and a couple of hose clamps. I guess this one hadn't been touched since the original installation.
Do you guys typically remove the unit when replacing the o-ring?
NO
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1987 300TD 309, xxx 2.8.2014 10,000 mile OCI


Be careful of the toes you step on today, as they may be connected to the ass you have to kiss tomorrow. anonymous

“Be who you are and say what you feel, because those who mind don’t matter, and those who matter won’t mind.” Dr. Seuss
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  #19  
Old 04-23-2010, 07:44 AM
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124.128/602.962/722.418
 
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Location: Raleigh, NC
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Quote:
Originally Posted by biopete View Post
Oh man. Wish i had posted earlier. When it does that just bypass the thing. You can leave the coolant lines connected. It does absolutely nothing unless its cold. And then it has to be really cold to make any difference. In the south apparently we just ignore these things. I bought two 300Ds and both had the heater bypassed.

I do not believe any coolant is used to heat the fuel.

The thermostat simply reroutes the fuel up to the head where it is preheated.
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1993 W124 300D 2.5L Turbo, OM602.962
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2002 Ford Explorer, 4.0L SOHC
2005 Toyota Prius, 1.5L

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  #20  
Old 04-23-2010, 07:46 PM
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Location: Lathrup Village, Michigan
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Mine has a coolant to fuel heat exchanger.

Why route fuel "into" the head?
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  #21  
Old 04-24-2010, 01:54 AM
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Location: Iowa City, IA
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The 606 heater is in the head. No coolant lines go to it. 603 and 602 is coolant heat.
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  #22  
Old 04-24-2010, 02:09 AM
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Join Date: Nov 2005
Location: Iowa City, IA
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Quote:
Originally Posted by compress ignite View Post
If it leaks from the "Front" it's the O-Ring.(number 149 in the Pictogram)
Easy quick FIX...
Remove the Circlip (#161)...
Remove the Cover(#155)...
R+R O-Ring (#149)...CAREFUL of the Spring (#137)

It tells you something about a "Professional" WT (Wrench Turner) who "Bypasses" the Thermostat/Heater.
It's actually a lot MORE EFFORT to Bypass rather than replace one o-ring!
Good info thanks. But your presumptions about the WT is wrong. I think the idea is the customer won't have the problem again. In the south, i would say that is a good way to go. Bypassing is a permanent fix. Replacing an O-ring is not. Can always hook back up. Simple is good.

And whose to say a professional did this? Could've been done by a desperate person leaking fuel like the OP with a mercedes screwdriver and no o-ring handy. I bet the OP wishes he had known to bypass the thing.
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  #23  
Old 04-24-2010, 08:54 AM
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Location: Raleigh, NC
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Quote:
Originally Posted by biopete View Post
The 606 heater is in the head. No coolant lines go to it. 603 and 602 is coolant heat.
My 602 doesn't use coolant.

I just replaced all the hoses at the thermostat, all were fuel lines.
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1993 W124 300D 2.5L Turbo, OM602.962
2000 Chevrolet Cavalier, 2.4L DOHC
2002 Ford Explorer, 4.0L SOHC
2005 Toyota Prius, 1.5L

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  #24  
Old 04-24-2010, 08:55 AM
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Quote:
Originally Posted by mplafleur View Post
Mine has a coolant to fuel heat exchanger.

Why route fuel "into" the head?
I suppose the reasoning was that the head heats up faster than the coolant.
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1993 W124 300D 2.5L Turbo, OM602.962
2000 Chevrolet Cavalier, 2.4L DOHC
2002 Ford Explorer, 4.0L SOHC
2005 Toyota Prius, 1.5L

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  #25  
Old 04-24-2010, 05:11 PM
compress ignite's Avatar
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Location: 32(degrees) North by 81(degrees) West
Posts: 5,554
Heat Exchanger

OW,

Quote:

"My 602 doesn't use coolant. I just replaced all the hoses at the thermostat, all were fuel lines. "

[Then you've nothing to worry about...Your "Head" will warp within ten minutes...
And then you can move on to other pursuits.]

The other end of those Thermostat fuel lines (That dis-appear under the Intake)
Connect to the Coolant/Fuel Heat Exchanger,which is plumbed into the Coolant
System.

Part # 233 is the Heat Exchanger.
Part # 245 is the o-ring.
Part # is the securing clamp.
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1991 300D 2.5-screenhunter_01-apr.-24-16.10.gif  
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  #26  
Old 04-24-2010, 06:17 PM
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Page 6, Section E describes how the fuel heat exchanger functions. Fuel travels up the tubes to the heat exchanger, where coolant in the head is exposed to the heat exchanger (the actual design of the heat exchanger is not discussed, so I am not clear if the fuel is routed through a U-tube into the head a short distance, or what...).

071.-0010 Function of injection system
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1993 W124 300D 2.5L Turbo, OM602.962
2000 Chevrolet Cavalier, 2.4L DOHC
2002 Ford Explorer, 4.0L SOHC
2005 Toyota Prius, 1.5L

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  #27  
Old 04-24-2010, 07:17 PM
aaa aaa is offline
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The fuel heater lines are melded with a heater line. You'll see heater hose going to the same spot as the fuel lines. It doesn't actually go into the head though.
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  #28  
Old 04-24-2010, 08:21 PM
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Posts: 38
Mine was leaking badly lately. The O-ring was a little over a dollar at the local M-B dealer, and it only took about 20 minutes to remove and replace it, you do need a set of split ring pliers to get the metal circlip off- I bought some at harbor freight for $3.

Its a good idea to replace the hoses while you are doing it and not have to mess with them again for a long time.

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