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  #1  
Old 03-11-2006, 10:27 AM
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Location: Wilmington, DE
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Death of a 300D ??

Well last year I started getting some noticeable blow by. Last night it took a giant leap forward. Apparently the blowby is so bad that it blew the breather tube off (tube that connects to the intake). Nice amount of oil everwhere.

I put it back on... checked the oil filler cap while running. The sucker nearly flew off from the pressure.

Besides looking for sympathy (last summer the car survived a tree falling on it) I have a strange symptom. The car will not shut off when the ignition is turned off. This appears to be a major vacuum leak, but my windows etc still work fine. I'm wondering, last ditch hope that this is a symptom not of blowby but of something else. I don't see how pressure under the valve cover would cause the IP to keep feeding fuel??? Something else appears to be going on and I'm hoping it's masking itself as blowby.

PS: What's your opinion should I rebuild the engine if it's blowby despite other problems the car might have or get another and part this one out?

Bill
'79 300D

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  #2  
Old 03-11-2006, 10:56 AM
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Join Date: Nov 2004
Location: Nova Scotia, Canada.
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Want the drivers fender if good. Will pm my address. Seriously does not sound very good at all but if car is still starting and running well extend the breather hose down under the car. It is then a road draft tube like the really old cars then plus lowers the chance of a runaway engine at some point. Needless to say check your oil level frequently just in case it is blowing oil out instead of just primarily vapors. Certainly not a fix but rather an attempt to extend the useful life of the motor somewhat. Also since it is starting to warm up go to straight 40 as an engine oil and that will lessen the problem to a great extent unless you have a hole in a piston. That is unlikely as the onset was slow. You will be suprised at the reduction of blowby. Right now the engine is probably worthless but as things get further out of hand you can list the motor on ebay as a good compressor motor. It does compress air and eject it after all. Worth bucks then. Unfortunatly it is not an original ideal as some poor souls out there have purchased some of these engines already I fear. Ebay for you.

Last edited by barry123400; 03-11-2006 at 11:13 AM.
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  #3  
Old 03-11-2006, 11:00 AM
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if you have the money find a wrecked w123 with the same engine in better condition and swap them out.. butttttt if your going to part it... id buy the glove box door striker
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  #4  
Old 03-11-2006, 11:42 AM
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Location: Nova Scotia, Canada.
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Dons ideal sounds better and is far more self serving for me. Buy a junk car for the engine and sell me the front drivers fender if good. Plus apparently the glove box door latch is gone as well. My understanding is these engines are not a good cheap rebuild candidate anyways. Looks like you coud manouver this deal into a free used engine with a little creativity. Try the straight 40 oil first I do not think you have much to loose.
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  #5  
Old 03-11-2006, 11:53 AM
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Appreciate the ideas on parting it out... I expect this is what I'll end up doing...

BUT...

Here's another symptom, tell me what you think about the sudden increased pressure and an oil leak from the gauge on the dashboard. I'll take it apart later today but I'm wondering if air coming in from the line to gauge is causing the pressure under the valve cover. Sounds odd, but... or maybe more likely it's the pressure causing the leak.

Thoughts?

Bill
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  #6  
Old 03-11-2006, 11:54 AM
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weird thing happened to me.. i had some blow by before an oil change the oil had lost all its viscosity it flowed like water.. bad bad i know p/o fault.. and i put in some new 15w40 delva 1300.. and no more blowby.. maybe the valve stems need replacing and a valve adjustment to be certian the engine is going also how many miles are on your D
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  #7  
Old 03-11-2006, 12:10 PM
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Bill, I would wait for some different opinions from some of the more knowledgeable members. I wouldn't think your shutoff issue is related. Your shutoff valve may be bad, which will make it hard to turn off, and will leak oil out the ignition switch and make you think it's the oil pressure guage. Just a thought, as that happened to me. If it is, quit driving it until you replace the shutoff, as it will send oil through your vac lines. Not a good thing...




I glove box striker is $10 bucks or so new. Buy it!
How much do you think it is to ship a fender. Find one locally.


It's like relatives fighting over the estate of someone just in the hospital.
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'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John
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  #8  
Old 03-11-2006, 12:21 PM
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Quote:
Originally Posted by JimmyL




I glove box striker is $10 bucks or so new. Buy it!
How much do you think it is to ship a fender. Find one locally.


It's like relatives fighting over the estate of someone just in the hospital.
i know he is not going to part it because if he really loves his D he will fix it no matter what... reason why i suggested if he wants to he can find a wrecker and switch engines if applicable..
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  #9  
Old 03-11-2006, 03:21 PM
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I was just coming in to post what JimmyL has stated. It is oil leaking from the ignition switch. There IS oil in my vacuum lines. In fact I'm spilling oil all over the place.

Funny thing is I just put in 2 QT's of oil and within a day 1 QT is gone. So would the shut off valve failure show as increased pressure under the valve cover? I think it's likely the other way around but I don't know how. I think the blowby back thru the vacuum pump perhaps and blew out my shutoff valve. Or is that total nonsense?

Bill
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  #10  
Old 03-11-2006, 03:24 PM
Brandon314159
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Does ANYONE here actually have useful information for him? Honestly now...the first post is about parting out the car...

Your problem is possibly related to the vac pump. If suddenly you have tons of blow by and your car stopped being able to be shut off then there is a good chance that something inside the vac pump gave way.

How is the line that runs from the brake booster to the vac pump? You might try plugging all lines coming off this unit (heading to the cabin, the tranny, etc) and check vac on it. If vac is good then you pump may be okay...

Regardless....its not "part out the car" time...you have two symptoms...your car is trying to tell you what is wrong
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  #11  
Old 03-11-2006, 03:26 PM
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Quote:
Originally Posted by Bill()C
I was just coming in to post what JimmyL has stated. It is oil leaking from the ignition switch. There IS oil in my vacuum lines. In fact I'm spilling oil all over the place.

Funny thing is I just put in 2 QT's of oil and within a day 1 QT is gone. So would the shut off valve failure show as increased pressure under the valve cover? I think it's likely the other way around but I don't know how. I think the blowby back thru the vacuum pump perhaps and blew out my shutoff valve. Or is that total nonsense?

Bill
careful dont put to much oil in or she will runaway.... their was a kid here that put to much oil in after an oil change because it was showing not at optimum level and the engine ran away.. then your in serious stuff...

maybe the increased pressure is from the vent line being clogged or something of that manner
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  #12  
Old 03-11-2006, 04:15 PM
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Quote:
Originally Posted by Bill()C
Besides looking for sympathy (last summer the car survived a tree falling on it) I have a strange symptom.
Bill
'79 300D
This is the part I question. How bad is this damage? This would help determine if you fix the oil problem or find another car just like it and use this one for parts.
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  #13  
Old 03-11-2006, 05:15 PM
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Quote:
Originally Posted by JimmyL
I glove box striker is $10 bucks or so new. Buy it!
How much do you think it is to ship a fender. Find one locally.


It's like relatives fighting over the estate of someone just in the hospital.
Whoa! Maybe just relax a little bit there, JimmyL. He DID mention parting it out, and that's where the response came from. It's not like he said he was only looking to fix it, and Barry123400 posted asking him to give him parts. The suggesting of parting out the vehicle had already been posted by Bill.

I understand that the best scenario is to get this vehicle fixed, but if someone mentions they think they will part it out, why not ask them first for a needed part before someone else does?


Quote:
Find one locally.
That's funny....never been to Nova Scotia, have you? Good luck SEEING someone who owns another Mercedes, let alone finding a part locally.


I understand it might looks like someone being a little too excited about getting a part, but it's not like it wasn't unsolicited.
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  #14  
Old 03-11-2006, 05:44 PM
RAYMOND485
 
Join Date: May 2005
Location: CALIF
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Blow By, Breather

1984 300d Turbo 137k
Replace Your Breather Tube, Valve Cover To Intake, I Had The Flat One It Was Stop Up And Try To Clean It And Note It Part Stop Up INstall The New Three Piece Round Oem Type At ***************
AIR INTAKE BREATHER HOSE PIPE TO VALVE COVER, P/N 6170100370 $19.50, ELBOW IS 6170160281
$2.50, AIR INTAKE BREATHER HOSE, AIR FILTER HOUSING TO CONNECTOR 6170180282 $5.21

Last edited by RAYMOND485; 03-11-2006 at 06:00 PM.
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  #15  
Old 03-11-2006, 10:29 PM
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Bill, DieselGiant just did a nice write-up on replacing the shutoff valve. It is not a difficult job, and with the assistance of his pics it is that much easier. I would start by replacing your shutoff valve, clean out the vac lines (WD40 and an air compressor work well for this). Then you can address your other issues from there.
You may also want to remove the shutoff assy on your ignition and blow it out also. Let us know how it goes......

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'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John
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