I hope this is not too dumb of a question!

I was just looking at an online parts catalog, and noticed that some very basic engine parts, like pistons, piston rings, main bearings, etc., are different for a 240D with manual transmission and a 240D with an automatic transmission.

I do not understand why these parts would be different. Did they use an entirely different engine in the 240D with a manual transmission? If so, I wonder why, and what other differences there are, besides the transmission of course?

Thanks for any enlightenment you guys can send my way!

George

Maybe the automatic needs more HP in order to get out of the way of speeding golf carts and to be able to climb over speed bumps?

__________________
Never a dull moment at Berry Hill Farm.

I once found an Armadillo who had run into my backside...stuck his snout right up my tailpipe.....that really choked down my engine.. until I heard a KaBlooee....and looked in the rear view mirror... that armadillo was expelled with a huge cloud of smoke into the fading distance...

And yours is a MANUAL!

__________________
Never a dull moment at Berry Hill Farm.

Seriously, I'd be interested in finding out the differences too. Could this be something to do with the earlier 616 engine...ya know, like the ones in the 115 chassis?

__________________
Never a dull moment at Berry Hill Farm.

It was not uncommon for American engines to have slightly difference cam specs for manual vs. auto....

The engine numbers for the 240D's with manual transmissions seem to all be 10-xxxxxx and the engine numbers for 240D's with automatics are 12-xxxxxx. I guess that may mean that they are entirely different engines. I dunno?!?

George

Those aren't MBZ part numbers...prolly SKUs from the vendor. I don't recall seeing anything in the OM619's FSM about auto/manual differences.

Over the years there have been some significant changes to the flame paths and combustion chamber in the piston crowns of these engines. That rolls over to changes in the PC as well.

__________________
Never a dull moment at Berry Hill Farm.

The way it read was like this:

Piston
Standard Size 90.90mm $125.00
From Engine No. 10-064618 (Manual)


Piston
Standard Size 90.90mm $125.00
From Engine No. 12-021938 (Automatic)

34 03-016 Piston
Standard Size 90.90mm $160.00
Up To Engine No. 12-021937 (Automatic)


George

Without looking much closer I can' t say that the effect you are seeing is from what I am about to describe or not... so don't Quote me.... LOL

on the four cylinder they changed the size of the bore for tax reasons in Europe at one time...but that will show up in the diameter quoted...

They also put different style precombustion chambers into a later engine which necessitated changing the piston which fit it...

Then they drilled the holes out on later engines ( these are called 'up rated' .... a couple of hp at best....

They have both wroght iron... in the dark ages, iron in early ones, and hardened cams later...and the things which rub on them must match up....

Kidding about the wroght iron....

I am getting confused. I was just using the piston as a "sample" part. All the engine numbers in the 240D manual start with a "10-xxxxxx" and all the engine numbers in the 240D automatic start out "12-xxxxxx" or so it seems......

George

I think what you're seeing is that the part number is referenced using the car serial number. The 10 in the serial number stands for a manual transmission, and the 12 for an automatic. The manual and automatic versions probably both started with serial number 000001, such as ###-10-000001 and ###-12-000001, but since different numbers of each version were produced each year, the numbers do not coincide. I bet if you look at the serial number break for the manual and automatic, and look at the actual part number for both versions, the part will be identical. If there was a production run change to the engine in the manual, then the automatic most likely had the same change at the same time.

OK, ....... Now that makes sense to me. I could not imagine why there would be two entirely different engines used.

Thanks!
George

I have not researched this on the MB engine...
but as I have mentioned, this is not uncommon on American engines... there being a difference between the cam meant for auto trans compared to manual trans....
so don't bet TOO much money until someone who knows posts an answer....

Leathermang,

OK, I will just wait and see what other information appears before I make any wagers.

Thanks for all the input!

George