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HELP!! I THINK I STUFFED MY CRANK!! 

 

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 Post subject: HELP!! I THINK I STUFFED MY CRANK!!
Posted: Fri Mar 25, 2011 7:06 pm 
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i am not happy, i am replacing the harmonic balancer on my ed with serpintine conversion, and i got to putting the new one on and i couldnt get it back completely so i thought maybe the bolt would pull it back but i striped the very end of the thread, and now i cant get the bolt in cos the ends dodgy, WHAT DO I DO? :oops:
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 Post subject: Re: HELP!! I THINK I STUFFED MY CRANK!!
Posted: Fri Mar 25, 2011 7:11 pm 
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remove it, and re-tap the end.

 

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 Post subject: Re: HELP!! I THINK I STUFFED MY CRANK!!
Posted: Fri Mar 25, 2011 7:48 pm 
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Remove the crank, or the motor? If it was just the end of it is there anyway i could still make it work? Maybe if i get a new bolt
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 Post subject: Re: HELP!! I THINK I STUFFED MY CRANK!!
Posted: Fri Mar 25, 2011 7:51 pm 
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yes new bolt will help heaps

 

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 Post subject: Re: HELP!! I THINK I STUFFED MY CRANK!!
Posted: Fri Mar 25, 2011 8:32 pm 
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i had the thread retapped in my EF when a mechanic did the same thing to my car

nothing had to be removed?
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 Post subject: Re: HELP!! I THINK I STUFFED MY CRANK!!
Posted: Fri Mar 25, 2011 8:35 pm 
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So my best bet would be to get a new bolt in the morning, and try and put it in straight and maybe it will work its way into the good thread? And would a bolt joint sell this size bolt?
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 Post subject: Re: HELP!! I THINK I STUFFED MY CRANK!!
Posted: Fri Mar 25, 2011 8:45 pm 
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no. re tap the thread and get a new bolt....simple
And yes a bolt place should have a replacement
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 Post subject: Re: HELP!! I THINK I STUFFED MY CRANK!!
Posted: Fri Mar 25, 2011 9:04 pm 
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JakeysED wrote:
So my best bet would be to get a new bolt in the morning, and try and put it in straight and maybe it will work its way into the good thread? And would a bolt joint sell this size bolt?


mate the thread is f**k........ dont keep screwing around with it or you could run into more serious probs, get it retapped & new bolt to suit
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 Post subject: Re: HELP!! I THINK I STUFFED MY CRANK!!
Posted: Fri Mar 25, 2011 9:25 pm 
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there are a few ways to recover from a partially cross threaded blind hole.

use something like a scriber to scrape clean the damaged thread (your aiming to remove any loose bits of damaged thread) if the thread is mostly stripped out (and not just all mangled and in the way) you will probably be able to get a new bolt in - seat it carefully and by hand making sure its starting right WD40 or similar helps and ONLY tighten up with tools when your sure its gone in right (youll know if its gone in wrong because it will be going in p****d).

You can also probably run a tap into the hole to clean the thread up - but if you start it wrong youll make things worse and end up needing to drill it out and tap a size or two larger

if this fails and only the first turn or two are f**k you can CAREFULLY drill the damaged thread out then insert the bolt (you can also f**k up and make things worse here (see above)

or do as everyone else has stated and skip straight to re drilling and tapping

 

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 Post subject: Re: HELP!! I THINK I STUFFED MY CRANK!!
Posted: Fri Mar 25, 2011 9:34 pm 
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Ok so should i take it somewhere to do it because i really dont wanna make things worse.. on the bolt its only the first 2 threads that are f**k, and i will have to trailer the car somewhere wich is a pain? And also the problem that cuased all this was that i couldnt get the balancer right back it was so tight how do you get them back ive got the rad out but condensors in the way to giv it a good hit?
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 Post subject: Re: HELP!! I THINK I STUFFED MY CRANK!!
Posted: Fri Mar 25, 2011 10:54 pm 
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Well after a fair bit of stressin i got onto my mate thats a mechanic and hes gonna tap it for me and get a new bolt.. hope all is good, does anyone have any tips to get the new balancer on?
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 Post subject: Re: HELP!! I THINK I STUFFED MY CRANK!!
Posted: Fri Mar 25, 2011 11:01 pm 
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clean all mating surfaces good and proper to get rid of all rust etc apply WD40 to the mating surface of the crank, set the oven up to around 100 deg (dont wanna go higher just in case you damage the rubber between the inner and outer bits) put it in for 45 mins to an hour then don your gloves, work fast and it should slip on to the crank

 

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 Post subject: Re: HELP!! I THINK I STUFFED MY CRANK!!
Posted: Fri Mar 25, 2011 11:12 pm 
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Thats a way i havent herd before jose, is this the way you do it i might give this a go the only other way ive herd is using the bolt to crank it on but not too keen on this idea cos this is how i stripped it in the first place...
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 Post subject: Re: HELP!! I THINK I STUFFED MY CRANK!!
Posted: Fri Mar 25, 2011 11:17 pm 
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JOSE wrote:
clean all mating surfaces good and proper to get rid of all rust etc apply WD40 to the mating surface of the crank, set the oven up to around 100 deg (dont wanna go higher just in case you damage the rubber between the inner and outer bits) put it in for 45 mins to an hour then don your gloves, work fast and it should slip on to the crank


hey not a bad idea.
i used a hammer :twisted:

radiator was out tho coz was replacin it at the time so more swingin room.

 

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 Post subject: Re: HELP!! I THINK I STUFFED MY CRANK!!
Posted: Fri Mar 25, 2011 11:17 pm 
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If you cant get a tap, get another bolt and chamfer down the end neatly, and angle grind a groove right down the side. this will clean any swarf / bad threads in the crank.



Then get a longer bolt, place the balancer on and get most of the thread in, tighten it up so the balancer moves in, then remove the longer version and replace with the original bolt.

 

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