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  #1 (permalink)  
Old 01-05-2007, 04:24 PM
72NOVA454
 
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Broken Tooth on Flexplate - Help

Guys

I'm in the process of swapping my torque converter (454 with Turbo 350 trans). I noticed one of the teeth on the flexplate is broken off about 80%. It's never caused a problem before when starting the car. I've had the car 3 years and I want to say it may have always been like that.

what should I do?

can I repair it?

should I just leave it?

How much work is it to pull it off and replace it with a new one? Do I have to worry about the type of oil seal on the rear? Is it simple to do? I know about matching the internal/external balancing type and number of teeth.

I don't want to mess with it unless I have to. I've got enough going on right now.

thanks.

Lee

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Old 01-05-2007, 04:30 PM
ccb ccb is offline
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Broken tooth on flex plate.

Think of all the work to get the converter changed. When you have the problem, you can just bump the engine a bit to get the starter to catch, if the broken tooth hasn't ripped the starter drive. I would change the plate and ring while I was in there.
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Old 01-05-2007, 04:48 PM
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Don't be a Cheap John when it comes to broken parts. The day the flywheel lands on that missing tooth and shears off a few more or tears up the drive gear you'll wonder why you didn't spend that little money for a part you were in on top of anyway.
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Old 01-05-2007, 04:59 PM
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Not much for TH trannys, but on manual flywheels and my C6, you can reuse the flexplate & just replace the ring gear itself.

Mark the orientation of the flexplate on the crank so you can relocate it correctly (for any balance issues).

Shouldn't have to worry about any seals, maybe just the pilot bushing, which you should be checking anyway.

Definately fix it now. Otherwise, you'll just start eating starters or, worse, get in a spot where you can't bump the engine a few degrees to catch a tooth & get it started.

If I've mispoken on the procedure for a TH350, I'm sure somebody will chime in.
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Old 01-05-2007, 05:39 PM
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Broken Tooth on Flexplate-Help

Something else to think about is that most engines usually stop in the same place when shut off,or within a very close distance,and the broken tooth is probably in this area,it sure wont fix itself!
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Old 01-05-2007, 06:29 PM
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Do yourself a favor and replace the flexplate while you have the trans out. Sooner or later that broken tooth will come back to haunt you and for the price of a new flexplate why not take care of it now.
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Old 01-05-2007, 07:09 PM
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Just a WAG (wild a55 guess) at a part number ... but only $25.00.. if it's the right one.


NAPA Line Code / Part Number BKP 600-5024
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Old 01-05-2007, 07:39 PM
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If you can weld.... I have repaired many broken flywheel teeth. Cars, trucks, HD equipment. If you can get at the tooth with a welder (I prefer MIG) the broken tooth can be easily built up and then re-cut with a 4" abrasive cut off tool.

I bought my daughters 96 Blazer for a song, because the flywheel was bad. It had six teeth bad.
I removed the skid plate and the flywheel shield. Welded up the bad spots and re-cut the teeth to match the originals.

That was three years ago and it is still going strong. Sure beats pulling the trans in a Blazer!!!

Just something that has to be done sometimes.. In the real world.
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Old 01-05-2007, 08:22 PM
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Heck of an idea.
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Old 01-05-2007, 08:55 PM
cjh cjh is offline
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Re: Flex Plate repair

I would weld it up too , before you start , make a gauge using thin flat tin.
Clamp the tin to the side of wheel,
then carefully scribe around at least 5 of the good teeth.
Unclamp,then snip "n" file the tin until the profile fits into and over the teeth.

This will ensure that as you are fitting your new tooth , it will have the same pitch as well as circumference as the rest of the teeth.

Better chance of not eating your starter gear

I would try it attached , that would save you from replacing seals if applicable

I used this method to repair the window winder rack used to crank up my 65 Ford driver side window..in car
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Old 01-05-2007, 08:57 PM
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Quote:
Originally Posted by BOBCRMAN@aol.com
If you can weld.... I have repaired many broken flywheel teeth. Cars, trucks, HD equipment. If you can get at the tooth with a welder (I prefer MIG) the broken tooth can be easily built up and then re-cut with a 4" abrasive cut off tool.

I bought my daughters 96 Blazer for a song, because the flywheel was bad. It had six teeth bad.
I removed the skid plate and the flywheel shield. Welded up the bad spots and re-cut the teeth to match the originals.

That was three years ago and it is still going strong. Sure beats pulling the trans in a Blazer!!!

Just something that has to be done sometimes.. In the real world.
yes I have heard of guys welding the teeth to repair them. I am an "ok" welder and do have a MIG machine. I don't think I want to do it though. I will first try to find a new flexplate for cheap - like $50 or so. If I can, that's the way to go. I would remove it from the vehicle to weld it anyway since that would be easier. If they are like $100-$150, I may try to weld it and then grind/cut it down, but that may be a loosing battle for me, I will likely throw weld splatter all over the other teeth during the process and end up grinding them down also. Lots of extra work for a part that will hopefully be affordable.

Lee
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Old 01-05-2007, 09:01 PM
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If you are going to replace it, remember that your 454 is externally balanced and you need a ring gear for a 454....not a 396/427
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Old 01-06-2007, 09:32 AM
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You are already pulling the transmission to swap the converter,spend the $25-$30 on a new flexplate and be done with it.
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Old 01-06-2007, 10:11 AM
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Swap it out now that you are swapping converters. You could weld up the old one for a spare and put it on the shelf or sell it.
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Old 01-06-2007, 10:10 PM
72NOVA454
 
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Quote:
Originally Posted by poncho62
If you are going to replace it, remember that your 454 is externally balanced and you need a ring gear for a 454....not a 396/427
I think my 454 is internally balanced. How do I check for sure. there is slugs of some heavy metal drilled into the crankshaft counterweights, plus it appears there are no weights on the flexplate and not balancing on the vibration damper.

your thoughts please

Lee
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