flywheel questions
 

Many of you know that i did a 5-speed swap a few months ago. My donor truck was a 91 and my driver is a 94 factory turbo. I was just told lately that the flywheel for a 94 factory turbo is balanced different than a N/A truck. It makes no sense to me but i have a vibration above 2500rpm and thought just maybe this could be the problem. Anybody know if there is a difference in flywheels?

The factory turbo engine has larger piston pins, which means the piston assembly weight is different than tha NA engine.
I believe that IDI engines are externally balanced by weighted harmonic dampeners and weighted flywheels. This means that flywheels & dampeners shouldn't be swapped between the 6.9 & 7.3, and would also mean that the factory turbo dampeners & flywheels are differently weighted than the NA 7.3s...

Will driving with this setup cause premature tranny or engine failure until i can get the right flywheel. I am really surprised this never came up with all the questions i asked during the swap.

Does anybody have a part number for this, everything i find is for 88-94 non turbo

What is the difference between F and K code trucks, both show turbo charged

does anybody know what the difference is between these two flywheels and if this is what i am looking for
Sachs NFW1069 - Flywheel | O'Reilly Auto Parts
Sachs NFW1067 - Flywheel | O'Reilly Auto Parts

I cant find to much diffeance expect the secnd link fits more applications. Could be the spring rates or tooth count. Couldnt find those specs though

K is `94 factory turbo, F is Power Stroke.

Jamye You have to remember tha there were 3 different versions of the 7.3 in 94. As far as I know both the NA and turboed 7.3 IDIs take the same flywheel, but the 7.3 powerstroke flywheel is different, and won't work on the IDI. Is that where the confusion is coming from?

I do understand the three different motors for 94. However i am now learning the motors are balanced different for the factory turbo and the N/A so the flywheel has to be different. I know that my truck is K code but every flywheel i find says 88-94. ???????

I just bought a 7.3 idi and the guy I bought it from took the after market flywheel that was on it and put it on his 6.9 with no prob he did say something about haveing to use the aftermarket clutch and pressure plate as they are a different size than the ford one but myself I do not Know.Thats just wat was said .

For reference, this is the origin of my question to Jayme Duty, since I'm doing this swap soon. This is from the Ford manual supplement for the 94 turbo modifications:

https://www.ford-trucks.com/user_gal...id=242075&.jpg

Nothing I had read before said anything about different flywheels for the factory turbo. I never really thought about it until your 1st. post in this thread, but it makes sense.
Now, how much difference it makes is a good question. I've read of people interchanging 6.9 & 7.3 flywheels with no problem, & I'd have to think that the difference in piston assy. weight is greater there than the difference between the 7.3 NA vs. Turbo.
The O'Reilly links are disapointing. Based on the engine code, they claim that both flywheels fit IDI's and Strokes... You might contact Sachs directly, with their part numbers. You might get better info there.

Good luck man!
Phy

Thanks for all the tips, i will contact ford and sachs today to see what i cant find out. is there anyother parts you guys would change out while i have the tranny out again. the clutch is almost new (10,000miles) so am not worried about it.

Northern, Good info, that is the first that I heard of that, but it makes sense. You learn something new every day.
I agree with Phy on the Orilley's links, if you do a search for a 96 flywheel you come up with a different number than what they say a 94 stroke takes, but they should be the same.