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Old 10-13-2008, 07:59 PM
Goatman's Avatar
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Join Date: Oct 2008
Location: Fort Myers, FL
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Might by, but blow by?

Hello all, I finally think/thought I found a TD I want to buy! Let me say right off the bat, its the first MB TD I''ve ever driven. Its a 84 300D, 136K on it, all original, one owner car from Florida. No rot, one small spot of scale rust on the driver''s door starting to come through a bit. All original paint and never been in an accident. All the power windows and doors work, the sun roof works, as he just replaced some of the faulty vacuum pieces. The car also has new brake lines and a new master cylinder. The underside of the car from what I''ve seen from lying on the ground is rediculously clean. The guy who owns it is the son of the original owner who passed away. He has every piece of paper that ever came with the car, including the original bill of sale. Sounds perfect, right?

Here''s a catch, or at least I think so:

The "guy" is a used car dealer. That makes me nervous enough. When I first started the car, the first thing I did was check for blow by. When I took off the oil fill cap, the blow by was very similar to this video. Almost non existant, perhaps a tiny wisp of smoke, almost undectable.

http://www.youtube.com/watch?v=4puPoZpdJQA

I then took the car down the road and onto the highway. The thing stops and rides pretty amazing, given its age. It accelerated nicely, although I had to put the peddle down 3/4 to the floor for it to really "get up" (remember, its the first one I''ve driven, so that may be normal?) . It cruises along nicely at 70-75 with no problems that I saw/felt. Temp was good, oil pressure was pegged at 30 every time I got on the gas.

Once I came back to the lot, I again popped the hood and removed the oil fill to check for blow by. It wasn''t quite as bad as this video, but it was definitley noticable.


http://www.youtube.com/watch?v=aEwqpc0GYn4&feature=related


I''m a little confused, as I would think that it should smoke more when the engine was cold and the pistons and rings weren''t fully expanded/sealed than when it was hot. The owner claims that''s from the car sitting, and will "go away" in a couple of days of driving. While I don''t know much at all about turbo diesels, I do know a bad ring seal is a bad ring seal and shouldn''t "fix itself". The car didin''t smoke out the exhaust when it was started or running. At least not anything abnormal from other diesels I''ve seen.


What do you guys think is the issue? The guy says he''ll warranty the engine and trans, as he''s personally driven the car to Florida twice (has 80K on it when he got it). He also claims I can take the car anywhere I want to look at it (or he''ll put it up on his lift) to check it out. I was skeptical, so I walked away for now. I started a new job and don''t have hardly any time to get the car to my mechanic to do a compression test on it, but I don''t want to get burned if it could be something major either.


What does the peanut gallery think?

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Old 10-13-2008, 08:22 PM
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Join Date: Aug 2001
Location: California
Posts: 177
Quote:
Originally Posted by Goatman View Post
No rot, one small spot of scale rust on the driver''s door starting to come through a bit. All original paint and never been in an accident.
Carefully check under the battery tray for corrosion. Even dry state cars can suffer here.

Regarding the blow-by; my CD was more noticable at operating temperature than when cold.

The 2nd video suggests an issue with one cylinder. Could be a tight valve. When were they last adjusted?

Worth a compression check before you proceed.

Just my 2c.
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1991 190E 2.6 170k
1995 E320CA 57k
1999 Chevy Tahoe 98k
2000 R1150GS 45k
1983 300CD 178k - sold, but not forgotten
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Old 10-13-2008, 08:33 PM
Goatman's Avatar
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Join Date: Oct 2008
Location: Fort Myers, FL
Posts: 172
That's just a video that I found on YouTube. Not the car in question. I will find out if or when the valves were last adjusted. I didn't even go through the paperwork yet. I do know I saw a receipt for new engine mounts.

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