Daughter's car (soon to be). She wants an automatic even though she can drive a manual. The decision has been made to install an auto. It's a settled issue so no need to debate it here I have to live with her, her mother, and her two younger sisters. My 6 year old son and I don't stand a chance. Enough about that.

I have a low mileage 240D engine with a 4-speed attached to it. I have a bad 300D engine with an automatic attached to it. I want to use the flywheel from the 300D on the 240D. I have looked at both flywheels and cranks and see no markings to indicate if they are balanced together.

What do I need to do to the 300D flywheel to make sure I can use it with the 240D engine?

Kevin

Any plans for the 4 speed once it is removed? I may be interested in the whole setup.

The manual trans has some issues. One of the shafts (reverse i think) has broken off the trans. I will part with it, the flywheel, and the clutch disc and pressure plate though. Make me an offer.

Kevin

If I just bolt on the flywheel and flex plate will I encounter any problems?

it's best to mark them as you remove them from the motor, and then take them to a balancing shop and have the imbalance matched to them.

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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!

Well, seeing as how the 240D manual flywheel was not marked before it was removed then this will not be an option now. The 300D automatic flywheel is still on the engine. What excactly am I supposed to mark since it is coming off of the 300D crank and will be used on the 240D crank? I am slow so humor me. I am not following you on this. Thanks!

Kevin

sounds like you are going to have to risk an imbalance then.

doesn't the (front) driveshaft have to be shortened as well due to the auto trans being longer? I think it may have a different cross member mount below too.

I have a driveshaft from a 240D auto so I'm gonna use it.

Kevin

ahh... I still have auto flywheels mounted on my 240 and my 300... I could set to TO on the 240, then mark it for you... feel like another swap?

__________________
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!

You must use NEW flywheel bolts.
They are stretch to yield = single use and trash.

They are speaking of static balancing the flywheel, similar to a tire.


.

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1985 300SD
1983 300D
1984 190D
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Well Kevin, if you are into it, I wouldn't worry about it. Stick it on and go. I would say it will work like a charm. New bolts are recommended, my thinking is if you can torque them to the proper number, do it. If they break it makes the job a bit more difficult. You have a broken transmission with the four speed. Being it is an 82 with the old style transmission box, it would or should be a very easy fix with that removable side cover. Haynes manual shows it really well. I would think it is very repairable in the car! If you have a solid body W123 with a good shifting four speed and a 240D you probably have a car value of $2500.00. Putting in that old automatic drops the value to $1000.00. Not a good deal. Measure twice, cut once! That automatic might be just enough difference in length to mandate a driveline modification. Expensive and not fun. Also you need a different crossmember at the rear of the transmission. Then you need to crossover the shifter assembly to the 240D which is different from what is on the 300D. Again you will have more problems. I would say, fix the fourspeed in the car and sell it and buy a cheap 300D for the girl, or I might even say, fix the four speed and tell sweet young daughter, "drive it or walk".

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1983 Mercedes W123 240D 4 Speed 285,000 on the road with a 617 turbo, beautiful butter yellow, license plate # 83 240D INDIANA

2003 Jaguar Type X, AWD. beautiful, good mileage,
Mom's car, but I won't let her drive it!

Let me better explain what is being done here. The 240D is going into a
300D. The 300D already has an automatic so no worries about the shifter assembly or trans cross member. As stated in an earlier post I already have the correct driveshaft for a 240D automatic set up so no modifications to the drive line are necessary. I have swapped engines and trans in these cars numerous times but never have done a swap that dealt with automatic to manual or manual to automatic. My only concern with the whole project is the flywheel balance relative to the crankshaft. My original post asked "What do I need to do to the 300D flywheel to make sure I can use it with the 240D engine?"

The '82 240D in my sig is not involved in this project in any way whatsoever. I have an extra 240D engine and a very nice '81 300D with a bad engine. The extra 240D is going into the '81 300D and mated with the automatic trans. Just wondering about flywheel balance is all. From what I have seen on both engines and flywheels there are NO markings to indicate a matched balance.

Thanks!

Kevin

Cleaning bits and pieces as I go.

Attached Thumbnails

 

Re: Flywheel imbalance

I do believe that you have examined the 240D wheel and crank flange carefully. If you still have the 240D wheel at hand, look in the center bore for a very lightly scribed line; that is the usual marking. That line would match with a similar line on the crank scribed on the flange outboard of the pilot bearing. If indeed there are no markings, then the 240D engine is 100% internally balanced, and the flywheel is neutral. To fit the 300D auto flywheel, it must also be brought to neutral balance.

If, on the other hand, you do find markings on the 240D parts, then the 300D wheel will need to be matched to the imbalance of the 240D wheel.
The 240D wheel can be checked at a balance shop; if it is neutral, then proceed with a 300D wheel brought to neutral also.

Thanks so much for the help. I appreciate it! Happy NEw YEar!!!

Kevin