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 > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #16  
Old 08-03-2010, 01:23 PM
Registered Shadetree
 
Join Date: Aug 2006
Location: Wilmington, NC
Posts: 676
Quote:
Originally Posted by 777funk View Post
Ah ha... ok, good to know. I am used to the actual line on the 300D models I've owned. I wasn't aware that the SD's used electric gauges for the oil pressure. Thanks!



Lux, any idea what kind of fitting I'll need to check the pressure? Not the standard 1/8" pipe thread fitting most US made cars use I'd guess?
Don't remember the size. It wasn't in my kit. Think I found it up the street at NAPA. Just take your sender and your gauge connector to a real parts house so they can match up what you need.

__________________
____________
1998 E300 +310,000K
1996 E300 +460,000K


Reply With Quote
  #17  
Old 08-03-2010, 06:10 PM
whunter's Avatar
Moderator
 
Join Date: Dec 2003
Location: Metro Detroit, Michigan
Posts: 17,390
Hmmm

Quote:
Originally Posted by pawoSD View Post
I have to say, I have never seen the little canister o-rings affect the oil pressure by more than .1 bar between being old and brittle and fresh.
I have seen a two Bar variation between new and no O-rings.
Reply With Quote
  #18  
Old 08-03-2010, 07:11 PM
777funk's Avatar
Registered User
 
Join Date: Dec 2006
Posts: 1,031
I just took a look under the oil fill cap and watched the cam oil squirters and it's getting plenty of flow. That's at idle where the pressure gauge reads zero or close to it.

So I take it that the gauge reading is off or I wouldn't be seeing that.

But it'd be a good thing to fix that anyways. I noticed the tach isn't working either so I may have gauge electrical issues.
__________________
-E300d '99 350k
-Suburban '93 220k
-TDI Jetta '03 350k
Sold
-F250 '96 7.3
-Dodge Ram 12V
-E320 '95 200k
-E320 Wagon 1994 155k
-300d Turbo '87 187k miles
-E320 1994 200k
-300d Turbo '84 245k (sold to Dan62)
-300d Turbo '84 180k
-300sd '80 300k
-7.3 Powerstroke Diesel 15P Van 500k+ miles
-190d '89 Non Turbo 2.5 5cyl 240k (my first MB)
Tom's Imports of Columbia MO Ruined the IP in changing leaky delivery valve O-Rings - Refused to stand behind his work. Mid-MO MB drivers-AVOID Tom's.
Reply With Quote
  #19  
Old 08-03-2010, 09:47 PM
toomany MBZ's Avatar
Registered User
 
Join Date: Nov 2006
Location: central Va
Posts: 7,820
Those (85's) have an OVP relay, I believe it's with the rest of 'em under the fuse cover. Check the one with a red top, there is a fuse that may have blown. You might get your tach back.
__________________
83 SD

84 CD
Reply With Quote
  #20  
Old 08-04-2010, 07:55 AM
Registered User
 
Join Date: Dec 2006
Location: Eastern Mass
Posts: 231
The tach inop is most likely due to the tach amp issue. The fix involves unscrewing the amp cap (located on drivers side inner fender)-pull the plug out of the cap and place a shim between the cap and the plug. Then reinstall.
__________________
81 300D Turbo 190K sold
83 300sd 319K best $500 I ever spent-daily driverw/ 2 tank WVO set up
Reply With Quote
  #21  
Old 08-04-2010, 10:05 AM
toomany MBZ's Avatar
Registered User
 
Join Date: Nov 2006
Location: central Va
Posts: 7,820
^ MB changed that system in 1984, no more amp.
__________________
83 SD

84 CD
Reply With Quote
  #22  
Old 08-04-2010, 11:10 AM
rrgrassi's Avatar
mmmmmm Diesel...
 
Join Date: Jun 2006
Location: Royse City Tx
Posts: 5,177
The 85 also has a KLIMA relay in the mix, but I do not know it's location.
__________________
RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K

90 Dodge D250 5.9 Cummins/5 speed. 400K
Reply With Quote
  #23  
Old 08-04-2010, 11:14 AM
whunter's Avatar
Moderator
 
Join Date: Dec 2003
Location: Metro Detroit, Michigan
Posts: 17,390
Answer

Quote:
Originally Posted by rrgrassi View Post
The 85 also has a KLIMA relay in the mix, but I do not know it's location.
1985 300SD
In the rear of the fuse box.
Reply With Quote
  #24  
Old 05-24-2011, 11:48 PM
Renntag's Avatar
User Especial
 
Join Date: Jul 2008
Location: Kona, Hi
Posts: 1,396
Also chasing zero oil pressure at idle issue with OM617 in W123. Mechanical gauge with oil feed line to gauge. Oil pressure hits full off idle above 1000rpms.

I believe I replaced the o-rings in question at last oil service a few months ago. I can replace them again just for kicks.

Any other suggestions? oil pump? drive chain? (I cant see how the chain would cause this.)
__________________
83 300TD (need rear wiper assembly dead or alive)
84 300SD Daily driver
85 300TD almost 400k miles and driven daily.
98 E300D *sold
86 300SDL *sold and made flawless 10 hour journey to new home.
Reply With Quote
  #25  
Old 05-25-2011, 07:45 AM
Diesel Preferred
 
Join Date: Oct 2007
Location: Charleston SC
Posts: 2,788
To the OP with 300SD, if indeed you have an electronic sender, replace that. When they age, they read lower and lower.

Renntag, you'll want to "second opinion" the oil pressure gauge as well, feed comes from the oil filter housing. If the pressure is at 0.5 bar at idle (is your idle speed too low?) and reaches 3 bar by 2000 RPM, you're OK.
__________________
Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC
Reply With Quote
  #26  
Old 05-25-2011, 07:46 AM
Registered User
 
Join Date: Nov 2004
Location: Nova Scotia, Canada.
Posts: 6,510
Quote:
Originally Posted by Renntag View Post
Also chasing zero oil pressure at idle issue with OM617 in W123. Mechanical gauge with oil feed line to gauge. Oil pressure hits full off idle above 1000rpms.

I believe I replaced the o-rings in question at last oil service a few months ago. I can replace them again just for kicks.

Any other suggestions? oil pump? drive chain? (I cant see how the chain would cause this.)
Could still be sub standard gauge in dash. Remember the normal pressure above mid rpms is always pinned. That is caused by pressure higher than the gauge can read.

Just because your gauge is touching the third mark at higher speed does not mean that it is not still reading low.

As mentioned before by Hunter you have already changed the old oil rings on the filter stem. Or at hot idle have a quick look to see if oil is still being supplied at pressure through the oil filler cap hole. I went back and see you have done this.

The electrical oil pressure sensor is highly suspect from your description as already mentioned I believe.

Last edited by barry123400; 05-25-2011 at 08:01 AM.
Reply With Quote
  #27  
Old 05-25-2011, 08:48 AM
vstech's Avatar
DD MOD, HVAC,MCP,Mac,GMAC
 
Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 26,832
what size o-rings are on your filter?
should be 6mmid, 2mm wall, and 7mm id, 2mm wall.
EVERYBODY keeps saying 6mm is right for both. I disagree. the 6mm is stretched really thin on the upper groove.
__________________
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!
Reply With Quote
  #28  
Old 05-25-2011, 11:16 AM
Registered User
 
Join Date: Sep 2001
Location: central Texas
Posts: 17,281
Listen to VsTech first... be sure those are correct AND that the tiny hole down the center of that tube is clean and open.... critical to oil everything in these engines...
Then if there is still a problem one thing the FSM says is that the screw in oil pressure valve on the back side of some of our engines can fail or even fall off... this might allow the symptoms you mention.. 2 at high rpm.. but 0 at idle....
When you do replace it be sure you have the latest recommendation.. there are at least 3 designs or pressure changes over the years... all shown in the FSM of course..
Reply With Quote
  #29  
Old 05-25-2011, 02:51 PM
Renntag's Avatar
User Especial
 
Join Date: Jul 2008
Location: Kona, Hi
Posts: 1,396
Quote:
Originally Posted by vstech View Post
what size o-rings are on your filter?
should be 6mmid, 2mm wall, and 7mm id, 2mm wall.
.
I have only used the o-rings that come with my filter. Where can I source just the two you mention?
__________________
83 300TD (need rear wiper assembly dead or alive)
84 300SD Daily driver
85 300TD almost 400k miles and driven daily.
98 E300D *sold
86 300SDL *sold and made flawless 10 hour journey to new home.
Reply With Quote
  #30  
Old 05-25-2011, 03:10 PM
Jeremy5848's Avatar
Registered Biodiesel User
 
Join Date: Mar 2006
Location: Sonoma Wine Country
Posts: 8,402
The sender thread is actually M10 straight threads (like a machine screw) with a crush washer for the sender but 1/8-28 pipe thread will fit, it's almost the same (nice coincidence), use Teflon tape and don't screw it in too tight.

If there is room, you can tee the line and have the electric gauge plus a mechanical back-up gauge. I did that in my '87 300D (W124, OM603). Different chassis and engine but the electric gauge sender is the same as the 300SD w/617 engine.

Jeremy

__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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 01:57 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page