Yikes! Big bucks for something that'll only ever be used once...
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| Flywheel bolt thread tap https://www.ausmini.com/forums/viewtopic.php?f=2&t=96058 |
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| Author: | deluxe67 [ Tue Sep 19, 2017 2:35 pm ] |
| Post subject: | Flywheel bolt thread tap |
I've a damaged thread in the crankshaft that needs cleaning up. The flywheel bolt is not cross threading but the threads are being damaged. Does anyone in Melbourne (I'm in the S.E. suburbs) have a tap I could borrow for a few hours? It's a weird one, sort of 5/8 16 TPI Whitworth but not quite. It seems to be a one off thread that only the English could dream up... Thanks Michael |
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| Author: | dicks72van [ Tue Sep 19, 2017 2:44 pm ] |
| Post subject: | Re: Flywheel bolt thread tap |
It's a 5/8 UNS thread, very uncommon thread...I can't help you with a tap but just giving you the thread. Sent from my iPhone using Tapatalk |
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| Author: | 9YaTaH [ Tue Sep 19, 2017 3:22 pm ] |
| Post subject: | Re: Flywheel bolt thread tap |
this (from Wiki) may help as well... Taps and dies are tools used to create screw threads, which is called threading. Many are cutting tools; others are forming tools. A tap is used to cut or form the female portion of the mating pair (e.g., a nut). A die is used to cut or form the male portion of the mating pair (e.g., a bolt). The process of cutting or forming threads using a tap is called tapping, whereas the process using a die is called threading. Both tools can be used to clean up a thread, which is called chasing. However, using an ordinary tap or die to clean threads will generally result in the removal of some material, which will result in looser and weaker threads. Because of this, threads are typically cleaned using special taps and dies made for this purpose, which are known as "chasers". Chasers are made of softer materials and are not capable of cutting new threads, however they are still tighter fitting than actual fasteners and are fluted like regular taps and dies (to provide a means for debris like dirt and rust to escape). One particularly common use is for automotive spark plug threads, which often suffer from corrosion and a buildup of carbon. |
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| Author: | simon k [ Tue Sep 19, 2017 3:51 pm ] |
| Post subject: | Re: Flywheel bolt thread tap |
find another bolt and make it into a chaser? |
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| Author: | deluxe67 [ Tue Sep 19, 2017 4:13 pm ] |
| Post subject: | Re: Flywheel bolt thread tap |
Hi Simon, Tried that, works as in you can thread it in all the way ok but damages the threads. So it will still damage a good bolt. The one (damaged) that came out held the flywheel on ok. Took a bit of effort to remove the flywheel. I could reuse it with locktite but that would be a bit of a bodge and would prefer not to go there... |
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| Author: | drmini in aust [ Tue Sep 19, 2017 5:19 pm ] |
| Post subject: | Re: Flywheel bolt thread tap |
Someone out here had these taps for sale. Might have been Minis plus? I made a chaser from an old flywheel bolt, it's fine for getting wasps nests or Loctite out but won't clean a damaged thread up. |
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| Author: | timmy201 [ Tue Sep 19, 2017 5:37 pm ] |
| Post subject: | Re: Flywheel bolt thread tap |
drmini in aust wrote: Someone out here had these taps for sale. Might have been Minis plus? I made a chaser from an old flywheel bolt, it's fine for getting wasps nests or Loctite out but won't clean a damaged thread up. https://www.minisplus.com.au/classic-mi ... es-18g1128 https://minikingdomonline.com.au/produc ... shaft-tap/ |
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| Author: | deluxe67 [ Tue Sep 19, 2017 5:46 pm ] |
| Post subject: | Re: Flywheel bolt thread tap |
Yikes! Big bucks for something that'll only ever be used once...
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| Author: | dicks72van [ Tue Sep 19, 2017 7:01 pm ] |
| Post subject: | Re: Flywheel bolt thread tap |
Big $$$ yes but cheaper than another crank and engine rebuild... Sent from my iPhone using Tapatalk |
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| Author: | drmini in aust [ Tue Sep 19, 2017 7:06 pm ] |
| Post subject: | Re: Flywheel bolt thread tap |
How did the crank get damaged? I always sit a short 5/8 bolt with the threads turned off in there when using the flywheel puller. To protect the crank. |
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| Author: | deluxe67 [ Tue Sep 19, 2017 8:35 pm ] |
| Post subject: | Re: Flywheel bolt thread tap |
Because the last time the flywheel was removed some dick in a rush (me) forgot to put the fitting in the the crank to protect the threads. Realized halfway into the process but have obviously chewed up the first couple of threads in the crank. Contemplating using the existing bolt with locktite because it held up ok before. Seems like a dicky thing to do though...? |
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| Author: | drmini in aust [ Tue Sep 19, 2017 8:47 pm ] |
| Post subject: | Re: Flywheel bolt thread tap |
You could put the crank in a lathe and bore the first couple of threads out that are damaged. Cheaper than buying that tap! There is plenty of thread engagement length without them. |
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| Author: | Fallingbrick [ Tue Sep 19, 2017 9:46 pm ] |
| Post subject: | Re: Flywheel bolt thread tap |
Try Bryan at Link? |
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| Author: | deluxe67 [ Wed Sep 20, 2017 7:30 am ] |
| Post subject: | Re: Flywheel bolt thread tap |
I've known Bryan for 35 years! First met at Link when I was an 18 year old with my Mini K, how time flies... He would have lent it to me yesterday but he can't find the bloody thing! He's looked for it several times.. Doc, the engine is in the car, it was meant to be a simple primary gear seal replacement exercise. Removing the engine and stripping it down is the last thing I want to do! What do people think of the idea of reusing the existing bolt with locktite? As I said before, it was tightening up ok and the flywheel took the usual amount of effort to remove. Would it be madness to go that route? Thanks Michael |
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| Author: | drmini in aust [ Wed Sep 20, 2017 7:34 am ] |
| Post subject: | Re: Flywheel bolt thread tap |
Loctite 262 will hold it. I and others have used this for years rather than the current too soft locktab. |
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