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Stripped thread inside the crankshaft 

 

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Posted: Wed Aug 06, 2008 12:54 am 
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if u need them inserts i can get them from work i'll just need to know wat size bolt and thread pitch eg; m10x1.5 or 3/8 unf

i was wondering wat sorta puller they were using to do this damage as pete said. cos all the ones i've used just have a centre rod it reacts off and 2 or 3 arms to go around the pulley?

 

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Posted: Wed Aug 06, 2008 1:13 am 
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FordFairmont wrote:
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.

And make sure they use a puller thats long enough to utilize all the crank thread for more strength when they refit the balancer


XR9UTE wrote:
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.


yeah i couldnt understand what FordFairmont meant by his post....to get the puller off you dont need to touch the thread other than to first undo the bolt

 

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Posted: Wed Aug 06, 2008 2:53 am 
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See if you have any of those mobile thread repairers around your area, they can work wonders and should be able to help you out

 

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Posted: Wed Aug 06, 2008 7:57 am 
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Nice way to drag out what would've been a simple job.

 

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Posted: Wed Aug 06, 2008 8:32 am 
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XR9UTE wrote:
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.


whoops my mistake, in my case the new balancer was a b**ch to get on i meant. And the importance of using a bolt longer than the factory one to push the balancer on to engage more of the thread

The car was handed back to me with a stripped crankshaft thread and my new balancer not fitted and was basically told to sort it out myself :evil:
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Posted: Wed Aug 06, 2008 11:14 am 
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FordFairmont wrote:
XR9UTE wrote:
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.


whoops my mistake, in my case the new balancer was a b**ch to get on i meant. And the importance of using a bolt longer than the factory one to push the balancer on to engage more of the thread

The car was handed back to me with a stripped crankshaft thread and my new balancer not fitted and was basically told to sort it out myself :evil:


I think that's most likely....and they probably are s**t you about it scaffy. They probably let some lacky do the job who didn't get the balancer far enough on before crankin on the bolt. Have a close look at how many threads are damaged. If it were overtightened in the first place then all of threads would damaged deep into the crank. Of course they could have done that too...by the same lacky!?
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Posted: Wed Aug 06, 2008 11:48 am 
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XR9UTE wrote:
FordFairmont wrote:
XR9UTE wrote:
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.


whoops my mistake, in my case the new balancer was a b**ch to get on i meant. And the importance of using a bolt longer than the factory one to push the balancer on to engage more of the thread

The car was handed back to me with a stripped crankshaft thread and my new balancer not fitted and was basically told to sort it out myself :evil:


I think that's most likely....and they probably are s**t you about it scaffy. They probably let some lacky do the job who didn't get the balancer far enough on before crankin on the bolt. Have a close look at how many threads are damaged. If it were overtightened in the first place then all of threads would damaged deep into the crank. Of course they could have done that too...by the same lacky!?


Pete, they told me about it when they took it off because they said it came off way too easily. They didn't think it was going to be that bad a fix due to the thread on the bolt looking fine. Only when it came to putting it all back together is when the severity of the problem has came to light.

I have no doubt some lacky somewhere along the line has gone and f**k it.

 

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Posted: Wed Aug 06, 2008 2:03 pm 
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Scaffy wrote:
XR9UTE wrote:
FordFairmont wrote:
XR9UTE wrote:
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.


whoops my mistake, in my case the new balancer was a b**ch to get on i meant. And the importance of using a bolt longer than the factory one to push the balancer on to engage more of the thread

The car was handed back to me with a stripped crankshaft thread and my new balancer not fitted and was basically told to sort it out myself :evil:


I think that's most likely....and they probably are s**t you about it scaffy. They probably let some lacky do the job who didn't get the balancer far enough on before crankin on the bolt. Have a close look at how many threads are damaged. If it were overtightened in the first place then all of threads would damaged deep into the crank. Of course they could have done that too...by the same lacky!?


Pete, they told me about it when they took it off because they said it came off way too easily. They didn't think it was going to be that bad a fix due to the thread on the bolt looking fine. Only when it came to putting it all back together is when the severity of the problem has came to light.

I have no doubt some lacky somewhere along the line has gone and f**k it.
as stated,use a heli coil kit and lock tight the coil in-they come in different lengths and will hold grade 12 bolts,loctite requires over 600 deg far. to release the grip,measure the hole depth and see what lenght is available in length,can be done with motor in,i have used them in engine blocks with badly worn head threads-stripped,note you must use loctite to stop the insert from turning,will hold any torque settingand wont change balancing of the crank.

 

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Posted: Wed Aug 06, 2008 2:57 pm 
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Simple scaffy,who did the balancer? make them f**k pay to fix it.

 

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Posted: Wed Aug 06, 2008 3:29 pm 
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Yeah green car, if it were that simple. It could have been these guys or it could have been the people who worked on it last time. I'm not about to jump to conclusions and can't be f**k arguing with anyone. Hopefully I can just get it fixed... or... drop a 363 bottom end in there!

 

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Posted: Wed Aug 06, 2008 4:41 pm 
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have you ever tried taking a bolt out thats cross threaded?? far from 'came off too easy'

they are full of s**t - they either damaged it using the puller or they damaged it putting it on!
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Posted: Wed Aug 06, 2008 5:04 pm 
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66 coupe wrote:
have you ever tried taking a bolt out thats cross threaded?? far from 'came off too easy'

they are full of s**t - they either damaged it using the puller or they damaged it putting it on!

Thats exactly what I reckon. It is not a hard job! How about going to the workshop and having a good look at the bolt that 'came out too easy'. I can't believe how someone can stuff what it is a very simple job....

 

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Posted: Wed Aug 06, 2008 6:07 pm 
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I don't get home til Friday. I've got a 45min chopper flight, then a 2 hour plane flight, so unfortunately can't go looking at it just yet.

Thinking back, I'm pretty sure when it was at BPT they said there was an issue with that bolt as well, from before they touched it.

Anyways, all I want is to get it fixed. I could start harping on and carrying on like an idot, but bottom line is, I can't prove that anyone did s**t.

I understand that taking a bolt out that's been cross threaded isn't an easy task, but in this case the bolt hasn't been cross threaded. What I've been told is that it's been over-tightened, stripped the thread inside the crank and appears as though it's been put back in again. This could be true, or any of the other theories could be true.

I'll speak to them again tomorrow as when I spoke to them today they had someone who'll be fixing it with the helicoil. I mentioned to them the keensert and thety said they'll check it out and work out which will be the best option.

Hopefully it'll be done by Friday so I can driver her.

 

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Posted: Wed Aug 06, 2008 9:59 pm 
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If its been over tightened which I highly doubt.. The whole thread will be bad and that's almost impossible on a thread that size..
I would say the outer 5 or 6 threads are stuffed . Could try drilling these threads out and running a tap through... I often leave this bolt loose but in place to break initial contact when removing.. Yes it means taking puller off and back on twice.. Yes as said double check puller fitting where is contacts crank.. The tapper fitting...

 

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Posted: Wed Aug 06, 2008 10:45 pm 
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overtightened.... lucky its not a toyota diesel, torque on the balancer bolt is around 350nm !!
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