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  #1  
Old 03-19-2010, 12:21 PM
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How to tell a 300 from a 350

I'm buying a new turbo (rebuilt) and after getting the number off my turbo I searched it and it's the turbo Mercedes used on the 350 motor, not on a 300 like my car. I'm pretty sure this is just someone put this turbo on at some point in the cars life, but I have my concerns that someone may have swapped a rod bender into my car, not just the turbo.

Are there any definitive ways to tell the 300 motor from the 350 from the outside?

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Old 03-19-2010, 03:31 PM
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Here's a link to the thread where I asked the same question less than a week ago. Nothing definitive has come up yet.

Differentiation 603.961 vs 603.971
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1986 M-B 300SDL, retired due to rust and electrical problems. Donated engine to:
1987 M-B 300SDL, odo dead. New project.
1982 M-B 240D, odo stopped at 308,000
1982 M-B 300SD, 175,000
1989 Dodge Ramcharger, 87,000 - 4wd, 318
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  #3  
Old 03-19-2010, 04:38 PM
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Quote:
Originally Posted by djustin973 View Post
I'm buying a new turbo (rebuilt) and after getting the number off my turbo I searched it and it's the turbo Mercedes used on the 350 motor, not on a 300 like my car. I'm pretty sure this is just someone put this turbo on at some point in the cars life, but I have my concerns that someone may have swapped a rod bender into my car, not just the turbo.

Are there any definitive ways to tell the 300 motor from the 350 from the outside?

A 350 would have the later head, so a 14 head would make the motor likely a 300.

MB often updates parts with later numbers. Some W126 stuff has W140 part numbers.

Jim
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Old 03-19-2010, 05:04 PM
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I don't think 350s came with a #16 head either, so any low number head would dq your engine from being a 3.5l. Getting the 350's turbo is a nice bonus, it spools up a lot quicker then the one meant for the 300.

-Jason
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2013 Fiat 500E. 20,000 miles, 80 miles at a time.
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2004 Touareg V10 TDI. 150,000 miles. One of 450.
1999 Jetta TDI. 310,000 miles.
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1991 Jetta ECOdiesel. 430,000 miles. 1 of 700. Sold to VeeDubTDI, totaled in front of our house
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Old 03-19-2010, 11:56 PM
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What's the max. no-load RPM of the engine? If it revs to 5200, it's a 3.0L IP.
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Old 03-20-2010, 01:50 PM
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Look at this thread:
'84 380SL OEM Wheels

I was looking at an SDL (but didn't buy it) a couple of years ago and did a lot of searching. I made the following notes: avoid engines 603.970 and 603.971. 603.961 is a good long block but may have a bad head. Maybe BC will confirm or correct my understanding.
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1983 300D, bought new, 215k+ miles, donated to Purple Hearts veterans charity but I have parts for sale: http://www.peachparts.com/shopforum/mercedes-benz-cars-sale/296386-fs-1-owner-83-mb-300d-turbo-rebuild-parts.html
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Old 03-20-2010, 02:22 PM
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Quote:
Originally Posted by Cr from Texas View Post
Look at this thread:
'84 380SL OEM Wheels

I was looking at an SDL (but didn't buy it) a couple of years ago and did a lot of searching. I made the following notes: avoid engines 603.970 and 603.971. 603.961 is a good long block but may have a bad head. Maybe BC will confirm or correct my understanding.
Generally true.

603.96x is a 3.0l engine with a perfect bottom end and a head that is prone to crack when overheated, more easily than other more durable ones. The head can be replaced with a newer-than-14 casting number when it does go, and the higher castings are considered "reliable" by comparison.

603.97x is a 3.5l engine with the same head (except the updated castings) as the 3.0l, but a different bottom end, some fraction of which (I've heard guesses from 1 in 4 to 1 in 2) will at some point prior to 150-200k miles bend a connecting rod, start consuming oil excessively, and require rebuilding or replacing.
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"What could possibly go wrong?"

~Michael S.~ -
1986 M-B 300SDL, retired due to rust and electrical problems. Donated engine to:
1987 M-B 300SDL, odo dead. New project.
1982 M-B 240D, odo stopped at 308,000
1982 M-B 300SD, 175,000
1989 Dodge Ramcharger, 87,000 - 4wd, 318
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  #8  
Old 03-23-2010, 01:49 PM
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If you find a OM603.97X parts motor let me know... I want the crankshaft.

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