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Stripped thread inside the crankshaft 

 

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 Post subject: Stripped thread inside the crankshaft
Posted: Tue Aug 05, 2008 6:11 pm 
Getting Side Ways
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Hi all,

My car's been in the workshop whilst I'm at work for the past few weeks. When they pulled the harmonic balancer off, they noticed the bolt came out much too easy. They looked into it and the thread on the bolt was fine, it was slipping in the crankshaft. They let me know at the time and said it shouldn't be too much of a problem to get it fixed. As it turns out, it may very well be a big problem to fix it. Everyone they've spoken to about fixing it want the crank out of the engine!

Has anyone had this happen before and is there a way of fixing it without pulling the motor down?

I'm really hoping there is.

Chad

 

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Posted: Tue Aug 05, 2008 6:22 pm 
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how the f**k did that happen?? omg nightmare!! on the otherhand... looks like that stroker might be happening sooner than ya thought!

 

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Posted: Tue Aug 05, 2008 6:33 pm 
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My mechanic reckons because the thread on the bolt is good, he reckons it's been over-tightened with a rattle gun or something, rather than doing it by hand and it's sheared it on the inside.

I'm not quite ready for the stroker just yet as I've got to get a new car for the missus and with the baby on the way, I need to keep some cash aside. It looks like this is my last swing out here as well. If i could have got another 2 out of it then it'd be all go for sure.

I'm really hoping someone can come up with a solution though.

 

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Posted: Tue Aug 05, 2008 6:52 pm 
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rattlegun !!!! arrrrrgh .....you might be able to fit a heli coil if it was just a temporary stop gap measure ?
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Posted: Tue Aug 05, 2008 7:13 pm 
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Scaffy wrote:
My mechanic reckons because the thread on the bolt is good, he reckons it's been over-tightened with a rattle gun or something


sounds like rubbish to me

same thing happened to me, and same story from the mechanic palming the blame on another. :roll: More like the balancer was a b**ch to get off, and they kept turning the puller when it was threading the crank, instead of stopping.

Was also told about pulling the engine but i took it to another mechanic who happened to have an engineering mob next door, and they successfully managed to tap a new thread in the crank. Its not perfect, but it was good enough to get a new balancer back on, thank f**k....... so try that dude

And make sure they use a puller thats long enough to utilize all the crank thread for more strength when they refit the balancer
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Posted: Tue Aug 05, 2008 7:15 pm 
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ouch! I think FordFairmont on here had a similar thing happen on his 6 banger, I'm pretty sure he had his mechanic drill and tap a bigger hole and use a bigger bolt.

EDIT: There ya go^^
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Posted: Tue Aug 05, 2008 7:22 pm 
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yeah i dunno if they fixed the existing thread or tapped a large one, but i know ive now got a bolt with a 19mm head instead of 21mm

Came undone the other day while i was turning the crank by hand, might get around to loctiting it me thinks :)
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Posted: Tue Aug 05, 2008 8:55 pm 
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it shouldn't be to much of a drama to repair although it's in a b***h of a spot, they can helicoil it (prob not the strongest option) or go one size up with the bolt. or theres another sort of rethread kit out there which u have to drill a bigger hole tap a thread, then screw in the replacement, hit down four little locking tangs and hey presto its like a brought one. only drama i can see is it may put ur crank out of balance with any of these options.....

or pull it out get the hole welded and rethreaded rebalanced and have piece of mind for a few extra bucks.

 

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Posted: Tue Aug 05, 2008 8:57 pm 
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FordFairmont - Did they do this while the motor was still in the car?

 

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Posted: Tue Aug 05, 2008 9:01 pm 
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3x-puursui7 wrote:
or pull it out get the hole welded and rethreaded rebalanced and have piece of mind for a few extra bucks.


If that needs to happen, I think there'll be a whole lot more work getting done.

The dramas never seem to end!!!

 

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Posted: Tue Aug 05, 2008 9:04 pm 
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Scaffy wrote:
FordFairmont - Did they do this while the motor was still in the car?


yeah...... was charged 200 in labour and that included labour for refitting the new balancer....... better than the alternative

Its not a permanant solution, in other words you dont wanna be removing the balancer on and off again too many more times, but its a good enough solution to get the car on the road again and hope theres no reason to touch any of it for awhile lol
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Posted: Tue Aug 05, 2008 9:11 pm 
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3x-puursui7 wrote:
it shouldn't be to much of a drama to repair although it's in a b***h of a spot, they can helicoil it (prob not the strongest option) or go one size up with the bolt. or theres another sort of rethread kit out there which u have to drill a bigger hole tap a thread, then screw in the replacement, hit down four little locking tangs and hey presto its like a brought one. only drama i can see is it may put ur crank out of balance with any of these options.....

or pull it out get the hole welded and rethreaded rebalanced and have piece of mind for a few extra bucks.


These are called "Keen Serts", a better option in this case
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Posted: Tue Aug 05, 2008 10:40 pm 
Getting Side Ways
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station-rat wrote:
3x-puursui7 wrote:
it shouldn't be to much of a drama to repair although it's in a b***h of a spot, they can helicoil it (prob not the strongest option) or go one size up with the bolt. or theres another sort of rethread kit out there which u have to drill a bigger hole tap a thread, then screw in the replacement, hit down four little locking tangs and hey presto its like a brought one. only drama i can see is it may put ur crank out of balance with any of these options.....

or pull it out get the hole welded and rethreaded rebalanced and have piece of mind for a few extra bucks.


These are called "Keen Serts", a better option in this case


Who does the Keen Serts? Is it done by an engineering mob?

 

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Posted: Tue Aug 05, 2008 10:48 pm 
Getting Side Ways
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I just did a search on Google. I'll be suggesting this option to the mechanic.

 

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Posted: Wed Aug 06, 2008 12:02 am 
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A Balancer puller doesn't engage the crank thread so unless they used the wrong tip which was too small in diameter to sit on the taper before the thread it can't actually damage the crank thread.
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