Which Flexplate to use?
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Junior User
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Which Flexplate to use?
I've got all the turbo stuff swapped over from my old blown IDIT to this previously IDI donor motor and was getting ready to pull the "new" motor off the stand to put the starter bracket plate back on and then get the flexplate and torque converter installed when I noticed there's a difference between my two flexplates. The IDI (stock) flexplate has a singular hole drilled along the edge and the IDIT (stock) motor's flexplate has 4 drilled in a row - pretty much the same area as the other flexplate. Other that this the flexplates are the same the "unused" mounting hole in the same orientation (cutout) spacings and what-not.... But I want to be sure which one to use? I have everything marked out so that I can assemble everything in the exact orientation it came off the motor - either one. Don't know if any of this matters but I figured better safe than sorry... Oh - also - I did not get the torque converter with the donor motor so I'm stuck with this one - worked great before the motor blew.
I did a quick search and couldn't really find an answer out there so figured I'd make a post. Hoping I can get back out there and at least be able to have everything ready to throw the engine in tomorrow - heck maybe even tonight!
Thanks in advance!
Happy New Year!
I did a quick search and couldn't really find an answer out there so figured I'd make a post. Hoping I can get back out there and at least be able to have everything ready to throw the engine in tomorrow - heck maybe even tonight!
Thanks in advance!
Happy New Year!
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A little deeper digging and I did find a few threads with related info - but I've seen people reply both ends of the spectrum.... "Doesn't matter at all" and "catastrophic results could happen"... The catastrophic guy said that the balancer and flexplate have to match. But then when I look into torque converter balancing I find that they are balanced to the flexplate and need to remain in the same orientation?
As I said - I've marked both plates as to motor orientation and the IDIT on to the torque converter orientation - and it wouldn't be hard to line everything up between the flexplates and transfer the orientation marks between the two. Just want to make sure I'm doing the right thing.
As I said - I've marked both plates as to motor orientation and the IDIT on to the torque converter orientation - and it wouldn't be hard to line everything up between the flexplates and transfer the orientation marks between the two. Just want to make sure I'm doing the right thing.
Scope Wizard
Joined: May 2019
Posts: 6,530
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I don't think the IDIT and IDI NA flex plates interchange
EDIT: I just looked and I see the Cranks are the same for IDIT and the IDI BUT they are balanced different, the balancers are different too I think .. so I would keep those pairs together.
EDIT: I just looked and I see the Cranks are the same for IDIT and the IDI BUT they are balanced different, the balancers are different too I think .. so I would keep those pairs together.
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Been toying with the idea of seeing if I can get the motor to fire up before putting the front end together again (no rad/coolant) or not... Hate to see $150 in SCA precharged fluid having to be drined again... But would hate even more to have something happen to a $1k motor/parts/labor cost investment go up in smoke... Just spent about $400 in fluids and parts for it today! Whew!
When I'd do swaps for my tuner friends we never thought twice about this kind of stuff. (EDIT: We've also never had to put this much work into just getting a motor out/in) Can't tell if we've just been lucky or if I'm just overthinking all of this!
Scope Wizard
Joined: May 2019
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the thing is IF it is an IDI engine then use IDI parts... IF it is actually an IDIT then use the IDIT parts... you can look at the engine Serial number on the top passenger side near where the IP cover mounts and see what engine it is 
I guess they Balanced the Crank different in the IDIT because they had Beefed up rods and wrist pins.
I guess they Balanced the Crank different in the IDIT because they had Beefed up rods and wrist pins.
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the thing is IF it is an IDI engine then use IDI parts... IF it is actually an IDIT then use the IDIT parts... you can look at the engine Serial number on the top passenger side near where the IP cover mounts and see what engine it is
I guess they Balanced the Crank different in the IDIT because they had Beefed up rods and wrist pins.
I guess they Balanced the Crank different in the IDIT because they had Beefed up rods and wrist pins.
Motor is officially back in the truck! Realized after I tightened down the last tranny bolt that I forgot to turn up the IP while it was out of the truck and super easily accessible... But oh well!
Happy New Year, sir! *Edit* CHEERS!
Fleet Owner
Joined: Jul 2006
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From: Mi'kma'ki
Yeah and that would of resulted in bad things lol. Lonewolf got ya steered down the right road. I dunno where it is now but did you guys dig up the thread where I posted the pic of both cranks side by side? That one says it all.Very important.
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Scope Wizard
Joined: May 2019
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I just went out into my garage and looked at 2 cranks last night.. and they pretty much look same but Drilling for Balance holes are way different between them.
I don't have an IDIT Balancer to compare with an IDI but looking those parts up shows they are different. I didn't bother searching but I'm sure it is posted here and I think IF FORDF250HDXLT posted info on it ... then it is reliable unlike many others that post.
I've noticed that many of the older pictures are gone now and there used to be an "Article" on this subject but these Forums decided we didn't need Helpful Articles anymore.
I don't have an IDIT Balancer to compare with an IDI but looking those parts up shows they are different. I didn't bother searching but I'm sure it is posted here and I think IF FORDF250HDXLT posted info on it ... then it is reliable unlike many others that post.
I've noticed that many of the older pictures are gone now and there used to be an "Article" on this subject but these Forums decided we didn't need Helpful Articles anymore.
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Junior User
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Sadly, no, I wasn't able to find the post you're talking about. I think one of the threads I read, I believe it was you (FORDF250HDXLT) that stated that the balancer/flywheel combo needed to match..? But like I said before, I was just a little concerned because before that I had found a few posts where people would state that it didn't matter.. I'm glad I was able to get some solid confirmation in it!
Thank you, guys!
Thank you, guys!
Scope Wizard
Joined: May 2019
Posts: 6,530
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this is a good PDF to Grab on the IDIT
https://vdocuments.mx/93-94-73-iditu...selengine.html
this might have been the Thread that was mentioned https://www.ford-trucks.com/forums/1...ank-shaft.html
https://vdocuments.mx/93-94-73-iditu...selengine.html
this might have been the Thread that was mentioned https://www.ford-trucks.com/forums/1...ank-shaft.html
Fleet Owner
Joined: Jul 2006
Posts: 20,382
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From: Mi'kma'ki
Yeah there ya go.Same pics I shared elsewhere as his in post #24. Drastic differences in the balances. Also,yes.That's the diesel coffee table book pdf and that shows the info too.
You guys are on top of it.
Now,many years latter we all know those '93 and '94 IDI Turbo blocks and guts were all totally unnecessary as we've been turbocharging the standard non turbo engines issue free with the same amount of boost so there wasn't a need for any of those beefed up components.It was all completely unnecessary for the boost levels typically applied to these engines and probably twice over or more too lol.
You guys are on top of it.
Now,many years latter we all know those '93 and '94 IDI Turbo blocks and guts were all totally unnecessary as we've been turbocharging the standard non turbo engines issue free with the same amount of boost so there wasn't a need for any of those beefed up components.It was all completely unnecessary for the boost levels typically applied to these engines and probably twice over or more too lol.
Thread Starter
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Junior User
Joined: Dec 2019
Posts: 82
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this is a good PDF to Grab on the IDIT
https://vdocuments.mx/93-94-73-iditu...selengine.html
this might have been the Thread that was mentioned https://www.ford-trucks.com/forums/1...ank-shaft.html
https://vdocuments.mx/93-94-73-iditu...selengine.html
this might have been the Thread that was mentioned https://www.ford-trucks.com/forums/1...ank-shaft.html
Yeah there ya go.Same pics I shared elsewhere as his in post #24. Drastic differences in the balances. Also,yes.That's the diesel coffee table book pdf and that shows the info too.
You guys are on top of it.
Now,many years latter we all know those '93 and '94 IDI Turbo blocks and guts were all totally unnecessary as we've been turbocharging the standard non turbo engines issue free with the same amount of boost so there wasn't a need for any of those beefed up components.It was all completely unnecessary for the boost levels typically applied to these engines and probably twice over or more too lol.
You guys are on top of it.
Now,many years latter we all know those '93 and '94 IDI Turbo blocks and guts were all totally unnecessary as we've been turbocharging the standard non turbo engines issue free with the same amount of boost so there wasn't a need for any of those beefed up components.It was all completely unnecessary for the boost levels typically applied to these engines and probably twice over or more too lol.
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