Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 12-05-2010, 01:00 PM
Registered User
 
Join Date: Nov 2010
Location: Hanahan, SC
Posts: 62
W123 Oil pressure Gauge

While changing my instrument cluster on my 84 300DT, I noticed what looked like a small trace of oil on the bottom leather part of the cluster. Having read other posts, I think I have read that there is actually oil in the line that runs to the gauge. Is that true? Hard to believe there is actually oil in that line to read pressure. My other cars has a sensor under the hood that sends an electronic signal to the gauge.If this is true, I guess i have dislodged the oil line while replacing the lighting. ANy ideas/comments greatly appreciated/

Thanks,
Harry

Reply With Quote
  #2  
Old 12-05-2010, 01:11 PM
280EZRider's Avatar
No Dumping
 
Join Date: Jul 2007
Location: Southern Oregon Valley
Posts: 1,599
Yes, this is true.

Why should this be so hard to believe? Isn't OIL pressure what is being measured?

Computerized and electronic gadgetry hasn't been with us very long.

If you haven't broken the oil line, then the connection is most likely lose. Tighten it and then give it a try.
__________________

Don't Chrome them; polish them
Reply With Quote
  #3  
Old 12-05-2010, 01:43 PM
Registered User
 
Join Date: Nov 2010
Location: Hanahan, SC
Posts: 62
OIL PRESSURE GAUGE

Well, water temperature measurement does not require pushing water up to the gauge. This technology (electronic) has been around for quite a while.thanks for the info.

Thanks,
Harry
Reply With Quote
  #4  
Old 12-05-2010, 01:51 PM
Registered User
 
Join Date: Nov 2010
Location: Hanahan, SC
Posts: 62
oil pressue gauge

Has anyone experienced this oil line coming loose or breaking a spitting oil out all over the back side of the instrument cluster? I'm getting worried now.

Thanks,
Harry
Reply With Quote
  #5  
Old 12-05-2010, 03:21 PM
junqueyardjim's Avatar
Registered User
 
Join Date: Apr 2005
Location: Cicero, Hamilton County, Indiana about 30 miles north of downtown Indianapolis
Posts: 2,623
Yes a number of people have got there carpets oiled that way and if it is a diesel that is not the only way you can oil your carpets. The engine shut off mechanism attached to the ignition key can do it also. Got to be careful now days with all this high tech equipment.
__________________
Junqueyardjim
Christianity, if false, is of no importance, and if true, of infinite importance. The only thing it cannot be is moderately important. C.S. Lewis



1983 Mercedes W123 240D 4 Speed 285,000 on the road with a 617 turbo, beautiful butter yellow, license plate # 83 240D INDIANA

2003 Jaguar Type X, AWD. beautiful, good mileage,
Mom's car, but I won't let her drive it!
Reply With Quote
  #6  
Old 12-05-2010, 10:54 PM
Registered User
 
Join Date: Aug 2008
Posts: 436
nope. lines don't fail- the GAUGE fail usually after it's been wrenched on.


Can make a stinky mess as the path can be long and some don't notice it until their foot is slipping off the brake. Seen them bad... nasty to clean. Replace carpet, sound proofing, dash lower insulation, and just clean everything else.

Keep an eye on it and replace it if it's questionable.

Michael
Reply With Quote
  #7  
Old 12-06-2010, 09:17 AM
Registered User
 
Join Date: Nov 2010
Location: Hanahan, SC
Posts: 62
w123 oil pressure gauge

I was able to get the cluster out far enough to see some oil on the padding at the bottom but the oil pressure line is dry and oil free. How does the shut off mech. get oil or why does it need oil? Is this a difficult fix? or DIY for an "average" guy??

Thanks,
Harry
Reply With Quote
  #8  
Old 12-06-2010, 11:18 AM
mespe's Avatar
benzbonz
 
Join Date: Feb 2005
Location: Cleveland, Ohio
Posts: 1,848
The vacuum lines going to the ignition switch are what the earlier poster was referring to. sometimes oil spews out of the vacuum line by the ignition switch which usually indicates a leak somewhere else.
__________________
Closing the store
Benzbonz.biz
on your smart phone or tablet.
Reply With Quote
  #9  
Old 12-06-2010, 01:19 PM
Registered User
 
Join Date: Nov 2010
Location: Hanahan, SC
Posts: 62
oil pressure gauge

Thanks for that. I dont think I have a vacuum leak. Having trouble getting the bottom panel out. I see one phillips screw but thats all. Removed it but the panel seems stuck in there. I must be missing seeing some more scews.

Thanks,
Harry
Reply With Quote
  #10  
Old 12-07-2010, 03:59 PM
Registered User
 
Join Date: Nov 2010
Location: Hanahan, SC
Posts: 62
oil pressure gauge

The oil leak under my instrument cluster seems to have stopped. When it first happened, I wiped the oil off with a rag. Couple days later, I see another drip, but since theb (about 100 mi. of driving) no more leak. Has anyone experienced an oil leak like this just stopping? Or is it just a matter of time before it starts again. The oil pressure fitting seems tight and dry as well as the ignition from the back. All replies appreciated.(84 300DT)

Thanks,
Harry
Reply With Quote
  #11  
Old 12-07-2010, 04:03 PM
TylerH860's Avatar
KHAAAAAAN-gress
 
Join Date: Aug 2007
Location: Wichita, Ks
Posts: 5,187
That panel is very easy to remove on a W123, same goes for the cluster.

Seldom do things fix themselves.
__________________
1985 500SL Euro w/ AMG bits 130k
1984 300SD Turbodiesel 192k
1980 240D Stick China 188k
2001 CLK55 AMG 101k
2007 S600 Biturbo 149k Overheated Project, IT'S ALIVE!!!
Reply With Quote
  #12  
Old 12-07-2010, 05:23 PM
Registered User
 
Join Date: Aug 2008
Posts: 436
I'm not sure you got a clear response on ..

The cut-off switch on the ignition can leak oil, it uses vacuum to pull a diaphram on the injection pump. If that diagram leaks, then the vacuum will pull oil into the line and switch.
Mechanical switchs are more reliable for pressure readings than electronic. So, they were used for a long time. Or you can blame it on if it works- no reason to re-design it. Probably carried over from W115 days into the W123's without any though.

Michael
Reply With Quote
  #13  
Old 12-07-2010, 05:30 PM
Registered User
 
Join Date: Nov 2010
Location: Hanahan, SC
Posts: 62
oil pressure gauge

Thanks Sam,

Do you know where this vacuum diaphram is located. Under the dash or hood?

Thanks,
Harry
Reply With Quote
  #14  
Old 12-08-2010, 09:29 AM
Registered User
 
Join Date: Nov 2010
Location: Hanahan, SC
Posts: 62
ooil pressure gauge

If I pull the cluster and then the gauge...will a leak be obvious? What am I looking for? As far as I can see now with the cluster puled out a few inches, the oil line and fitting is tight and dry.

Thanks,
Harry
Reply With Quote
  #15  
Old 12-08-2010, 09:45 AM
Stretch's Avatar
...like a shield of steel
 
Join Date: Sep 2009
Location: Somewhere in the Netherlands
Posts: 14,461
Quote:
Originally Posted by hms09 View Post
If I pull the cluster and then the gauge...will a leak be obvious? What am I looking for? As far as I can see now with the cluster puled out a few inches, the oil line and fitting is tight and dry.

Thanks,
Harry
Well I guess that depends on how much oil is on your carpet - now that you've got the gauge out you could try running the engine to see if any oil weeps or squirts out.

The other possibility that was also posted was a leak from the vacuum lines running to the ignition key - take a look there too.

If you still can't find it take a deep breath and don't get distracted by the wood or the trees - if you see what I mean? The oil must be leaking from somewhere and it will leak down.

__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 09:36 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page