Anyone have any tips on how to tell a OM603 3.0L from a 3.5L? I am looking at a 93 300SD that had the engine swapped, possibly to a 3.0L, but we do not know for sure.

Is the head the same casting number of the two engines? It definitely has a "22" head on it.

Any and all help is certainly appreciated!

Thanks.
Charles

22 is the latest casting from MB, and it's equally possible to be installed on a 603 3.0 or 3.5 you would have to find numbers on the block itself. I do not know where you would look though.

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Anyone know where the relevent block number would be and/or what they would be?

Thanks.
Charles

A 3 is a 96x while a 3.5 is a 97x. Look on top of the block just aft of the water outlet to the radiator.

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__________________
James Marriott
2003 Buick Regal
1983 300D (228k, frau Auto)
1996 Suburban K2500 (192k, 6.5 turbo diesel/4WD towmaster 10,000)
www.engineeringworks.biz
1987 300SDL junker 170k
1982 300SD junker, 265k

Thanks. That is just what I needed. Will post the results.

C.

On the reman .970 in my car that flange has no markings on it. There is this tag on the bellhousing, though:



-J

__________________
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.

No number on this one either. Where on the bell housing is that tag located? We could not see anything when we looked today.

C.

That bell housing tag is a reman engine tag. If original, it'll have a paper VIN sticker on top of the bellhousing flange on the rear of the block.

The easiest place to find the numbers is on the top of the block, where the block sticks out on the driver's side under the fuel filter mount. It is stamped into the iron block there.

__________________

Gone to the dark side

- Jeff

I should have been more clear. This engine has no number on the milled area in front of the injection pump, which from a previous post sounds like it may be normal for a reman engine. The paper tag is there, but illegible. Anything else to look for? Where is the aluminum tag shown in the previous post located?

Thanks again.

Charles

__________________
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.

Thanks man, that is jest what I needed.

C.