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  #1  
Old 06-28-2007, 04:39 PM
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leaks leaks leaks! 1983 300D

I hate them. That's why I'm chasing each one down and fixin it.
So far I've replaced the trans cooler lines, engine oil cooler lines, valve cover gasket. I do not see anymore drips onto the ground. Yeah! But I still see some seepage where the injectors screw into the head, just a bit during warmup and then it stops. I assume that is fuel leaking? I have bought new injector seal washers. Is that what is leaking? Are there other parts I need to pull the injectors and test them? What is this metal ring about 1/8" thick at the base of the injector for? There is a 1/4" gap and I have not seen this part on other diesels before. What does it do? Attached is a pic, not sure if the details are good enough to show the gap in the ring.



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leaks leaks leaks! 1983 300D-photo_062807_001.jpg  
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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
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Last edited by whunter; 02-15-2011 at 02:27 AM. Reason: attached picture
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  #2  
Old 06-28-2007, 05:05 PM
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Exclamation That's all Injector....

Your photo shows that your fuel injector is leaking where the upper and lower portions join......when you remove your injector you want to turn the larger nut, which will remove the entire injector.....if you attempt to turn it at the hex where the 2 leak lines connect, you may wind up with the top half of the injector with a spring and some shims that could easily be lost.....

SB
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Diesels:
'85 300D, "Max, Blue Benz", 155K, 27.0 MPG
'84 190D 2.2, "Eva, Brown Benz", 142K, 40.2 MPG
'77 240D (parts car)
'67 Eicher ES 202 Tractor "Otto" (2cyl, Air Cooled, 30HP)
Gassers:
'94 Ford F-150, "Henry", 170K (300 Six) 17.5 MPG
'85 190E 2.3, 148K....Parts Car
'58 Dodge W300M Powerwagon (Flat Fenders) Less than 10 MPG
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  #3  
Old 06-28-2007, 05:53 PM
toomany MBZ's Avatar
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quote=funola; I assume that is fuel leaking?
Probably.
I have bought new injector seal washers.
Is that what is leaking?
Probably not.
Are there other parts I need to pull the injectors and test them?
Perhaps, you'll need to determine if necessary.
What is this metal ring about 1/8" thick at the base of the injector for?
I think prechamber.
Looks like you need to replace those jumper lines between injectors.
No need to pull 'em really, unless you want to do a compression test, or check injectors themselves for spray pattern and pressure.
If that leak is not fuel, a prechamber issue may be next in line to correct, meaning you'll have to pull injectors, and yes, if you pull 'em, use your new washers.
Hope this helps.
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Last edited by whunter; 02-15-2011 at 02:31 AM. Reason: spelling
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  #4  
Old 06-28-2007, 07:04 PM
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I took a closer look, the injectors are not leaking where the 2 halfs unscrew. The return lines are less than a year old and they are not leaking. The very minor leak seems to be coming from the base of the injector where it screws into the head and is on cyl #1 and possibly #3. How do I check the pre chambers?
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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked
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  #5  
Old 06-29-2007, 06:23 AM
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The SM mentions to visually check the prechamber to determine if the "ball pin" is in satisfactory condition. Remove the injector, and washer shine a flash light to inspect. Not very clear to me. Anyway, go to buy parts above, follow links, you'll see a picture of one.
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Old 06-29-2007, 06:48 AM
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Question Are you sure.....

I'm not sure that you could get a fuel leak from the joint between the injector and the pre-combustion chamber......are you certain that that leak in the photo is Fuel?? It could be leaking down the side of the injector next to the valve cover....

That injector joint looks very shiny/wet in the photo...at least to me....but then again I have old eyes.....

SB
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Diesels:
'85 300D, "Max, Blue Benz", 155K, 27.0 MPG
'84 190D 2.2, "Eva, Brown Benz", 142K, 40.2 MPG
'77 240D (parts car)
'67 Eicher ES 202 Tractor "Otto" (2cyl, Air Cooled, 30HP)
Gassers:
'94 Ford F-150, "Henry", 170K (300 Six) 17.5 MPG
'85 190E 2.3, 148K....Parts Car
'58 Dodge W300M Powerwagon (Flat Fenders) Less than 10 MPG
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  #7  
Old 06-29-2007, 08:13 AM
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I thought it looked like the valve cover gasket might be the culprit.

Tom W
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..I also have a 427 Cobra replica with an aluminum chassis.
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  #8  
Old 06-29-2007, 08:26 AM
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we all need camera's that have macro settings. it sure is hard to get a closeup photo of stuff. without focus it's hard to tell anything usefull from the photo. there appears to be shiny fuel on the top of the injector body, all around the PC ring, and all around the Valve Cover gasket. if the fuel is creeping up around the PC ring between the head and the ring, new PC washers will be required as well as some form of PC tool, either homemade, or special order. If the fuel is creeping between the injector and the pc ring, new heat shields should take care of it, along with proper torque settings on the injector body.
fwiw, mine leak a bit too...
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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 06-29-2007, 10:18 AM
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Sorry for the pic quality. The pic is also misleading since I took it after spraying the area with brake clean before it has fully dried. I see the pic does show the injector half line being "wet". After running the engine up to temp, that area on the injector is totally dry as well as all return lines. I will clean the head again and try to do a better job this time and look more closely to pinpoint source of the leak and report back.
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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked
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  #10  
Old 06-29-2007, 10:25 AM
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1983
300D

Fastlane: Diesel Prechamber
http://catalog.peachparts.com/item.wws?sku=6170100352

How do I post pics of the parts catalog? The [IMG}xxxxx[/IMG] img code does not work nor does the insert pic feature.

The catalog show 3 parts for the PC

Prechamber
Prechamber Collar
Prechamber Seal Ring

What is the order of assembly into the head?

Is it: Prechamber > Prechamber Seal Ring > Prechamber Collar then injector?

Or is it: Prechamber Seal Ring > Prechamber > Prechamber Collar then injector?

Why are there 2 prechamber seal ring sizes? Which one is for my car (83 300D turbo)?

Fastlane: Prechamber Seal Ring, Standard - 2.0mm
http://catalog.peachparts.com/item.wws?sku=W0133-1643608

Fastlane: Prechamber Seal Ring, Standard - 2.3mm
http://catalog.peachparts.com/item.wws?sku=W0133-1715215


Fastlane: Injector Heat Shield
http://catalog.peachparts.com/item.wws?sku=W0133-1643266


Does the injector thread into the Prechamber collar? Per the pics the injector cannot thread into the head directly.

I am looking at an exploded view line drawing fig 4A page 120 of the Haynes manual and it is adding to the confusion. I can't correlate the drawing of the prechamber in the Haynes vs the photo in the parts catalog.

Sorry for all the questions.
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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

Last edited by whunter; 02-15-2011 at 02:50 AM. Reason: repair links
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  #11  
Old 06-29-2007, 11:40 AM
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Have you tried a combination of super glue and silicone rubber to stop the leak? If I remember correctly that was what you used on a set of old oil cooler lines. I think it would be just as affective in this application.

TimK
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83' 300D Turbo - 300K + Miles
00' 1.9L TDI Beetle
85' 6.5L Turbo, GV-OD, GMC Suburban,
67' 2.5L Diesel NA - Land Rover Series IIA

Here's what you do if it's so cold your diesel fuel gels. Smear some on some toast and stay inside until it warms up outside.
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  #12  
Old 06-29-2007, 11:43 AM
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Quote:
Originally Posted by Kuhlrover View Post
Have you tried a combination of super glue and silicone rubber to stop the leak? If I remember correctly that was what you used on a set of old oil cooler lines. I think it would be just as affective in this application.

TimK
ohhh you are bad, Kuhl... baaaad. and you have a long memory to boot.
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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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  #13  
Old 06-29-2007, 12:25 PM
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If you do not have anything useful to post, why post at all? I do not have time right now but I will be back later to give you the reason of why I did what I did with the oil cooler lines.

Quote:
Originally Posted by Kuhlrover View Post
Have you tried a combination of super glue and silicone rubber to stop the leak? If I remember correctly that was what you used on a set of old oil cooler lines. I think it would be just as affective in this application.

TimK
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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked
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  #14  
Old 06-29-2007, 02:02 PM
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That view in the Haynes manual is lifted straight from the SM. Item #5 nozzle plate, I'm pretty sure, is the washer. The injector screws into the prechamber after collar, don't know where the seal ring goes. But a leak would occur with a failed washer, not sure how that would happen. vstech is right about a special tool and torque to specs. Once the collar is removed, you may need another tool of some sort on a slide hammer? Anyone else? When installing you have to get prechamber lined up just right to accept GP. Sounds like a ton of work for a small leak. Even more confused? Sorry.

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Last edited by toomany MBZ; 06-29-2007 at 02:15 PM.
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