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 ShopForum > Technical Information and Support > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 09-30-2008, 01:39 PM
JEBalles's Avatar
Registered User
 
Join Date: Jun 2008
Location: Carlisle, MA
Posts: 1,225
Coolant Mysteriously Disappearing

About two months ago, I installed a Greasecar vegetable oil conversion kit in my 1983 240D. This involved splicing into and adding coolant hose. After installation, the car was run, coolant added, run again, coolant added again. About two weeks ago, I noticed my coolant level significantly low, filled it up again. Last night, I topped it off again. I don't drive too often, maybe 50 miles a week, maybe less. I can't find an obvious leak, I was told maybe it could be a leaky head gasket. How would I be able to diagnose that?
Reply With Quote
  #2  
Old 09-30-2008, 01:43 PM
Gurkha's Avatar
Satyameva Jayate Ad vitam
 
Join Date: Jun 2003
Location: Boondocks
Posts: 1,026
Under hard acceleration or when you start up the car, do you get lots of white smoke, if you do, that means its a leaky head gasket.
__________________
99 Gurkha with OM616 IDI turbo

2015 Gurkha with OM616 DI turbo

2014 Rexton W with OM612 VGT
Reply With Quote
  #3  
Old 09-30-2008, 02:04 PM
rrgrassi's Avatar
mmmmmm Diesel...
 
Join Date: Jun 2006
Location: Royse City Tx
Posts: 4,872
You could still have air in the coolant system. Also check your radiator and your veg oil tank for coolant. Those HIH setups can leak, and tracing it is a PITA.

Since the leak started after the VO kit, I would start there first.
__________________
RRGrassi


70's SPM #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 210K miles

03 VW Golf TDI 5 speed 372K Miles

RIP--Lost in fire...82 300D 322K was My Daily Driver-On the search for a w126 now...

90 Dodge D250 5.9 Cummins/5 speed. 350K
Reply With Quote
  #4  
Old 09-30-2008, 02:08 PM
Banned
 
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
The first thing to do is to get the device that pressurizes the cooling system. Then, search for a leak..........sometimes it's small and it takes a week to leak out one quart.

If you are positive that no leaks are present, it might be a good time to send off an oil sample to the lab. See if they find glycol traces in the oil. If so, the head gasket is compromised (not uncommon on older vehicles).
Reply With Quote
  #5  
Old 09-30-2008, 02:22 PM
Registered Hack
 
Join Date: Mar 2008
Posts: 4,612
you should also be checking your coolant level at operating temperature and cold before startup. You will get 2 very different readings.

Plus now that hoses have been added, you are allowing for more expansion at warm temps = coolant level in reservoir appearing low
__________________

Reply With Quote
  #6  
Old 09-30-2008, 02:51 PM
winmutt's Avatar
85 300D 4spd+tow+h4
 
Join Date: Apr 2006
Location: Atl Gawga
Posts: 9,325
He doesnt have a reservoir. What temps are you running?
__________________
http://superturbodiesel.com/images/sig.04.10.jpg
1987 300D Sturmmachine
1991 300D Nearly Perfect
1994 E320 Cabriolet
1995 E320 Touring
2001 Eurovan FOR SALE
1985 300D car, sold and missed.
OBK #42
Reply With Quote
  #7  
Old 09-30-2008, 03:09 PM
Registered Hack
 
Join Date: Mar 2008
Posts: 4,612
good call, thanks.

where does the overflow tube go..? drain to ground?
__________________

Reply With Quote
  #8  
Old 09-30-2008, 03:19 PM
tankowner's Avatar
You talkin’ to me?
 
Join Date: Dec 2007
Location: Columbia, MO
Posts: 907
Quote:
Originally Posted by winmutt View Post
What temps are you running?
---> x2

Also, check the simple things first. Check your radiator cap to be sure that the rubber gasket inside is not brittle and falling apart. If it is, your system may not be pressurized and your coolant maybe boiling off.

If you want to make sure you don't have a leaky head gasket - drain your oil to make sure there is no coolant in it - the notorious milkshake look.

If nothing turns up there, then its probably your WVO set-up. Are you running HIH?
__________________
'95 E300D ("Tank") - 231,000 miles
'79 240D ("Biscuit") - 197,250 miles (Sold)
'83 240D ("Ding-Ding") - 217,000 miles (Death by deer)
______________________________________

"Back off, man. I’m a scientist” ~ Peter Venkman
Reply With Quote
  #9  
Old 09-30-2008, 07:53 PM
Registered User
 
Join Date: Jul 2007
Location: USA
Posts: 2,156
Quote:
Originally Posted by jt20 View Post
good call, thanks.

where does the overflow tube go..? drain to ground?
yeah, you have an what is called an open system cooling system.

Check all radiator hoses, area between block and head. if its not there the leak is internal so it could be the heater core which is found by having wet carpeting that smells like coolant. Also check the radiator
__________________
1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)
Reply With Quote
  #10  
Old 09-30-2008, 09:21 PM
Registered User
 
Join Date: Nov 2004
Location: Nova Scotia, Canada.
Posts: 6,510
If you have a heat exchanger for your vegatable oil it is imperative to make sure the coolant is not mixing with your fuel. Actually should have an aftermarket water separator anyways.
Reply With Quote
  #11  
Old 10-01-2008, 04:29 PM
JEBalles's Avatar
Registered User
 
Join Date: Jun 2008
Location: Carlisle, MA
Posts: 1,225
I already checked the vegetable oil tank, no leak, no smoke either, I looked up other signs for a leaky head gasket, no oil in coolant, oil looks fine, no smell from exhaust. No wet carpet either, cap's fine, and I just got the car in april. I never checked the coolant, but I never experienced any overheating or anything to make me feel something could be wrong. How would I check an internal leak?
Reply With Quote
  #12  
Old 10-01-2008, 04:36 PM
DeliveryValve's Avatar
Chairman of my Benz
 
Join Date: Jun 2006
Location: Central California
Posts: 4,081
As Brian Carlton stated earlier, get a pressure device and put the system under pressure. The other quick thing to check is your veggie fuel filter. Unscrew the bottom drain and see if anything other then veggie oil comes out. (warning... by doing so you'll introduce air in the system so make sure you hand pump the air it out afterwards) If you see something different it could be one of the internal o-rings or veggie line is compromised.
__________________
1983 123.133 California
- GreaseCar Veg System


Reply With Quote
  #13  
Old 10-01-2008, 09:27 PM
JEBalles's Avatar
Registered User
 
Join Date: Jun 2008
Location: Carlisle, MA
Posts: 1,225
I checked the filter, just oil. how much is a pressure device? I have a vacuum pump, will that work?
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 01:06 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, 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