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Topic: Crack in C-4 flexplate
From: Green Bay, WI
Registered: Nov 2001
posted 12-06-2001 08:36 PM
A while I read a post where a guy said he routinely puts a new flexplate in a car before replacing the tranny (assuming that the 30+ year old one has not been replaced previously). Anyway, the thought was they all crack anyway, so it's cheap insurance, and you don't have to pull the tranny later. I looked at the plate out of my 72 Mav (250 six) and sure enough, it's cracked (on the starter gear in the valley between 2 teeth). I don't remember if the flexplate normally cracks along the gear or where it bolts to the crank. Is one crack in the starter "fatal"? Thanks guys.
From: Saco, Maine MCA # 47773
Registered: May 99
posted 12-06-2001 09:16 PM
Yes, it is. A crack means a failure will happen soon, and after you get it all together do you really want to take it all apart again a little while later?
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From: Demopolis AL
Registered: Jun 99
posted 12-15-2001 04:23 AM
worse case scenario, I've seen brand X's with broken flexplates driven for years.
it causes driveline vibration, a great deal of it in the engine.
I replaced the flexplate, still knocked.
me an' bossman had a nice fight over whether I knew how to put on a flexplate and whether I tightened it down tight enough...
so, moral of the story, the guy drove the truck for a year or two with it knocking, I think the flexplate allowed vibration to get to his reciprocating assembly and hose his engine.
or it could be the other way around, rod knocking for years eventually find a weak spot in the flexplate...
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