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#1
10-12-2009, 12:04 PM
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Engine Head serial number - useful?
Hi, I was wondering if knowing my engine's head serial number is useful for anything. I'm trying to figure out if my car's engine is original or maybe a factory replacement.
It's a 1992 300SD with a supposed 603.971 motor. I know those could have weak rods but my engine has 260k miles on it and going pretty strong (IMO). The head serial number is 603 011 21 01. I don't have much history of the car. Can't find which dealer this was serviced in FL. It has records from an owner in MD - an extensive collection which I'm going to go through again.
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1992 W140 300SD 1982 W123 240D and others non MB vehicles... 
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#2
10-12-2009, 12:40 PM
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Unless Im mistaken the models plagued with weak rods would be the 3.5L diesel in the 350SDL/SD. I have yet to read anything about the lower end of a 3.0 being a problem.
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87 300SDL (Silver/red) 08 VW GTI (Sold) 89 F250 5sp turbo diesel 00 Triumph Sprint ST (4sale) 00 Polaris Xplorer 400 4x4 09 Kawi KLR
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#3
10-12-2009, 12:46 PM
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I don't think a 92 would have come with a #21 head from the factory. Look on your bellhousing on the passenger side, see if you see a tag like this one:
 Casey, even though the car is badged as a 300SD it still has the 3.5l engine  -Jason
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket  Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E.
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#4
10-12-2009, 02:34 PM
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My '91 had no metal tag, just a paper one (illegible) on top of the bellhousing.
The chronology of the heads has been discussed, I was told that my '91 should have come with a 17 head originally. I don't know about the '92 but also have not heard of a 21 head, hopefully it is a turbo head.
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 Gone to the dark side - Jeff
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#5
10-12-2009, 02:45 PM
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Had your 91 gotten a new engine?
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#6
10-12-2009, 03:57 PM
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That's what I never figured out. Block is still sitting in the shop, no idea what to do with it.
The sticker is just like the VIN stickers on all of the body panels, I'm guessing that it is the original block and that's how it is identified, with a VIN sticker at the top of the bell-housing area. Had a 22 head though, that's all that mattered to me.
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Gone to the dark side - Jeff
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#7
10-12-2009, 04:16 PM
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engine #s
Casey the 603.971 is the 3.5L (maybe rod bender) the 603.960 is the 3.0L version. Cheers
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It's always something simple 91 300D 603.960 (from japan) 194K 92 Toyota Diesel Landcruiser HDJ81-t 116K 02 Golf TDI new head courtesy of PO 87 300D 97 BMW 525 TDS Wagon 5spd bunch of Onan and other diesel generators
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