99 7.3 flywheel broke again !! - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 10 (permalink) Old 08-26-2009, 11:08 PM Thread Starter
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99 7.3 flywheel broke again !!

Hey Guys !! I need help !! I have a F350 7.3 auto transmission that has broken the flywheel for the second time. This truck is completely stock. What am I missing here ? It has both of the dowel pins there and the last time I replace the wheel and spacer with parts from the Ford dealer. I torqued all my bolts to specs. Has anyone else had this happen to them ??
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post #2 of 10 (permalink) Old 08-26-2009, 11:20 PM
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Re: 99 7.3 flywheel broke again !!

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Hey Guys !! I need help !! I have a F350 7.3 auto transmission that has broken the flywheel for the second time. This truck is completely stock. What am I missing here ? It has both of the dowel pins there and the last time I replace the wheel and spacer with parts from the Ford dealer. I torqued all my bolts to specs. Has anyone else had this happen to them ??
Does the truck have the original engine and transmission or has either been changed?

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post #3 of 10 (permalink) Old 08-27-2009, 12:49 AM Thread Starter
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Re: 99 7.3 flywheel broke again !!

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Does the truck have the original engine and transmission or has either been changed?
Yes, the transmission was replaced with a Ford reman. unit. But that was long before the first flywheel broke- which was in April of this year. I have the transission out and do not see anything wrong with the trans case yet.
I do not know about the engine, I don't think that it has ever been out.
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post #4 of 10 (permalink) Old 08-27-2009, 12:28 PM Thread Starter
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Re: 99 7.3 flywheel broke again !!

Anyone have any ideas on this mess that I have in front of me ?
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post #5 of 10 (permalink) Old 08-27-2009, 01:38 PM Thread Starter
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Re: 99 7.3 flywheel broke again !!

I checked my crankshaft end play. It is .0075 I am sure that is in specs.
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post #6 of 10 (permalink) Old 08-27-2009, 02:46 PM
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Re: 99 7.3 flywheel broke again !!

How far do the dowel pins stick out of the spacer?

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post #7 of 10 (permalink) Old 08-27-2009, 03:48 PM Thread Starter
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Re: 99 7.3 flywheel broke again !!

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How far do the dowel pins stick out of the spacer?
They are out 3/8 of a inch. I found a Ford service tip on the problem. I must not be the only one breaking flexplates !!
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post #8 of 10 (permalink) Old 08-27-2009, 09:20 PM
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Re: 99 7.3 flywheel broke again !!

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They are out 3/8 of a inch. I found a Ford service tip on the problem. I must not be the only one breaking flexplates !!
3/8" out of the spacer is OK...3/8" out of the block (not all the way through the spacer) would be a major problem.

time to get out a straight edge, a set of feeler gauges...and start looking for things that aren't flat between the back of the engine block, (uniform) thickness of the aluminum horseshoe spacer...(uniform) thickness of the thick flexplate adapter...tight bolts (on thick flexplate adapter & bellhousing)?

next will be that of the trans bellhousing mating surface is flat (straight edge)...and no cracks around bellhousing

converter face flat? (again, straight edge it)

loose converter bolts/nuts?

input shaft on trans tight (no side to side play)?

check driveshaft for being bent, check cardan joint on upper end of driveshaft (been there...) ...

the OEM flexplate isn't usually the cause of a flexplate failure.
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post #9 of 10 (permalink) Old 08-27-2009, 09:42 PM
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Re: 99 7.3 flywheel broke again !!

make sure your starter is the right one, i just had mine done bc it came from a used dealer with the wrong starter
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post #10 of 10 (permalink) Old 08-27-2009, 10:29 PM Thread Starter
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Re: 99 7.3 flywheel broke again !!

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3/8" out of the spacer is OK...3/8" out of the block (not all the way through the spacer) would be a major problem.

time to get out a straight edge, a set of feeler gauges...and start looking for things that aren't flat between the back of the engine block, (uniform) thickness of the aluminum horseshoe spacer...(uniform) thickness of the thick flexplate adapter...tight bolts (on thick flexplate adapter & bellhousing)?

next will be that of the trans bellhousing mating surface is flat (straight edge)...and no cracks around bellhousing

converter face flat? (again, straight edge it)

loose converter bolts/nuts?

input shaft on trans tight (no side to side play)?

check driveshaft for being bent, check cardan joint on upper end of driveshaft (been there...) ...

the OEM flexplate isn't usually the cause of a flexplate failure.
You mentioned checking the driveshaft and being there and done that---
What happened to yours ? Driveshaft problems broke your flexplate ??
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