Is the E99 7.3 a solid or dual mass flywheel? - Ford Powerstroke Diesel Forum
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post #1 of 13 Old 09-13-2012, 01:48 PM Thread Starter
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Is the E99 7.3 a solid or dual mass flywheel?

I am going to have to replace my clutch and they are askign what flywheel I have. I thought all the SDs were solid but now I am not sure.
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post #2 of 13 Old 09-13-2012, 01:55 PM
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only the OBS trucks were dual mass. the SD's have a Solid mass flywheel

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post #3 of 13 Old 09-14-2012, 07:46 AM
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Originally Posted by HVAC SuperTech View Post
only the OBS trucks were dual mass. the SD's have a Solid mass flywheel
Really??? I thought sd's were dual mass?????
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post #4 of 13 Old 09-14-2012, 08:51 AM
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Stock 99-03 SD with ZF6 were a dual mass.

If its stock you still have a dual mass, if its not then most likely it has been upgraded.

If you need a solid flywheel i got a used one for sale. Only 30K on it and the only reason it was pulled is cause i had a gnarly HPOP oil leak and all the oil soaked my clutch plates and would slip. Flywheel is in great shape, no nicks, no dings and is not warped one bit.

I ordered a complete south bend not knowing what i was getting into and if i hadnt i wouldnt have even got my flyewheel turned before installing the new one.
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post #5 of 13 Old 09-14-2012, 09:02 AM
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^Thats exactly what I thought. The OP should swap that dmf out now before he gets everythign back together and it decides to go.
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post #6 of 13 Old 09-14-2012, 09:10 AM
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The powerstrokes shipped from the Indianapolis Engine Plant were equipped with the lighter ("dual mass"?) flywheels if they were going to be matched with an automatic transmission, and a solid mass flywheel for manual transmissions.


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post #7 of 13 Old 09-14-2012, 09:26 AM
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If the ^^above^^ statement were true they WOULD NOT sell solid flywheel conversion kits for the ZF6. Plain and simple.

Ive never in my life seen a automatic with a flywheel on it. Kinda serves no purpose cause the flat surface for your clutch plates would be useless.

Automatics come with a flex plate, the torq converter acts as the mass to keep the engine turning between pulses at idle.
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post #8 of 13 Old 09-14-2012, 10:15 AM
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Quote:
Originally Posted by CarportMechanic View Post
If the ^^above^^ statement were true they WOULD NOT sell solid flywheel conversion kits for the ZF6. Plain and simple.

Ive never in my life seen a automatic with a flywheel on it. Kinda serves no purpose cause the flat surface for your clutch plates would be useless.

Automatics come with a flex plate, the torq converter acts as the mass to keep the engine turning between pulses at idle.
What all is involved in converting, as in, what comes with this 'kit'? I would think it would just be a matter of swapping out the dual mass for a standard flywheel...

I would guess that I still have the stock clutch in my red truck, and since installing the DP Tuner, I'm guessing it might not live long... so I plan to start gathering parts (and info) so I'm ready when replacment time comes. Having a flywheel, clutch and related parts sitting on the shelf means all I gotta do is drop the trans and put it in, not wait while I scrounge up the cash to buy it.

What are the (dis)advantages of standard and dual mass flywheels?

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post #9 of 13 Old 09-14-2012, 10:32 AM
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dual flywheel is a bit smoother.. but can crack, disintegrate, and cause bad vibrations when going bad. Single flywheel chatters more @ idle but better for hi hp/tq.
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post #10 of 13 Old 09-14-2012, 12:19 PM
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Originally Posted by 85_305 View Post
dual flywheel is a bit smoother.. but can crack, disintegrate, and cause bad vibrations when going bad. Single flywheel chatters more @ idle but better for hi hp/tq.
That has more to do with the clutch material than the flywheel. As for the OP . . . call the dealership with your VIN and they can tell you what flywheel was put in it most likely.
If you are going to be hot rodding the truck and drag racing it alot then I would upgrade . . . if not just have the existing one turned on a lathe for $30.

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