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  #1  
Old 07-25-2013, 07:53 PM
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Join Date: Aug 2010
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Recently purchased 1991 300D, noob questions

Hello,

Long time Mercedes freak, noob to diesels here. My other half and I recently purchased a 1991 300d with 309,000 miles on it. The car was owned by one person up until recently and was always/almost always serviced at a Mercedes dealer. The car runs/drives absolutely great, apart from a few things. I've searched and searched, and got mixed answers, so I was hoping some of you friendly folks could clear up a few things for me.

1. It has a grey/white smoke cloud on start up. Starts great, glow plug light seems to work as it should, and after the initial cloud at the first "puff" it seems to be perfectly fine. smokes on harder throttle at times as well. My question is, is that normal? I've read everything from possible head gasket problem (coolant is good) to simple fuel burning and that it's normal. Just wanted to get a more clear answer.
I've read that a quart of ATF with a full tank will clean out some deposits that might be causing the smoke. Any input regarding this is appreciated.
The car has no leaks except at the injection pump, I see a bit of fresh dark staining on it. Is that my problem?
I mainly would just like to make sure that the car is okay to drive, the smoke itself doesn't bother me much.

2. The A/C was converted over to R134A, there must be some type of leak because I refilled it. It seems to blow alright, but I am wondering what type of pressure I'm supposed to have at the low side. I charged it to ~35, it falls to 32 or so when the compressor kicks on. Can I charge it some more? Or is that the optimal level?

3. I'm a noob to diesels. Even though the car runs/drives great as I indicated above, any overall input and suggestions are appreciated. As far as what i should look into, check over, inspect, and overall ownership input is appreciated.

Thanks in advance!

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  #2  
Old 07-25-2013, 08:21 PM
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Join Date: Jul 2004
Location: Barrington, RI
Posts: 5,643
Congrats on your purchase! These are great cars....I've got two of them and love them!

As to your white smoke, I had virtually identical symptoms on my 92 and it turned out to be the head gasket (at 244k miles). Is the oil level going down? Do you any oil by the exhaust manifold by #1 cylinder? Those were symptoms of mine as well. So some searches on smoke....I'm sure others will chime in as well.

On AC pressure, see AC Pressure Chart.

This is a great forum....lots of extremely knowledgeable (not me!) and helpful (I try to be) people.
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06 E320 CDI "Benson", Platinum Blue, 180k mi, Stage 1 tune
06 E320 CDI "Rutherford", Black, 151k mi, Stage 1 tune
91 300D "Otis", Smoke Silver, 132k mi

19 Honda CR-V EX 10k mi
Thirteen other MB's owned and sold
1961 Very Tolerant Wife
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Old 07-25-2013, 08:26 PM
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Join Date: Jul 2004
Location: Barrington, RI
Posts: 5,643
Is it diesel that's on top of the injection pump? If so, probably delivery valve seals need to be replaced. A common, once-in-a-great while repair.
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06 E320 CDI "Benson", Platinum Blue, 180k mi, Stage 1 tune
06 E320 CDI "Rutherford", Black, 151k mi, Stage 1 tune
91 300D "Otis", Smoke Silver, 132k mi

19 Honda CR-V EX 10k mi
Thirteen other MB's owned and sold
1961 Very Tolerant Wife
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Old 08-18-2013, 06:23 PM
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Join Date: Aug 1999
Location: Dalton, Georgia
Posts: 942
I just purchased a 91 300d 2.5 today with 288k on it. Man is it a quiet diesel. But guys it will not get out of its on way slower than my 240d if that tells you something. The car idles and sounds wonderful hardly a puff of smoke under any condition. It just winds out holds the gear for a second ...then a firm shift with very little momentum.. It almost has a hesitation like its holding back. She acts like she wants to go but wont. Is the turbo suppose to be audible during acceleration with these cars. I do not here any spooling I don't believe.

Sorry to hijack your thread. Just want to hear what you are experiencing. Thanks Joe
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Current stable......
17' Rogue SV 43k
08 9-3 SportCombi 155k
97 e300 diesel 226k

sold
02' e320 210k
00' e430 167k
01' e320 171k (regret sale)
91' 300d 2.5t 300k (sold to ecoofidaho)
79' 240d 177k (old yellow my avatar)
87' 300d 169k (junk but fast)
85' 300tdt 261k (RBM parts delivery)
85' 300dt 68k (one owner cream puff)
82' 240d 250k
84' 300dt 198k (sold to diesel don)
91' 190e 2.3 61k
88' 260e 140k
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Old 08-18-2013, 08:26 PM
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smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,806
shertex hasn't bought into this but others have cut to the chase - Wastegate actuator swap for OM602.962 - revisited

Sixto
87 300D
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  #6  
Old 08-18-2013, 09:35 PM
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Join Date: Jul 2004
Location: Barrington, RI
Posts: 5,643
Quote:
Originally Posted by sixto View Post
shertex hasn't bought into this but others have cut to the chase - Wastegate actuator swap for OM602.962 - revisited

Sixto
87 300D
Oh, I buy it....just haven't had a pressing need to do it yet.
__________________
06 E320 CDI "Benson", Platinum Blue, 180k mi, Stage 1 tune
06 E320 CDI "Rutherford", Black, 151k mi, Stage 1 tune
91 300D "Otis", Smoke Silver, 132k mi

19 Honda CR-V EX 10k mi
Thirteen other MB's owned and sold
1961 Very Tolerant Wife
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  #7  
Old 08-18-2013, 09:43 PM
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smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,806
Think of it as closing the barn door before the horse gets out

Sixto
87 300D

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