The threads in my crank are wrecked

[revver]

The threads where the bolt goes to hold the primary on are messed up bad. When pulling the clutch, i tightened the puller so much, it split the end of it, and when i took it out after the clutch popped it messed up the threads bad. i threaded the bolt in today to check if the threads were okay, when i took the bolt back out from what i tightened it in, it stripped half of the threads on the bolt.........i had to impact it out
What should o do? tap it? what is the thread pitch and size? i have no idea what do do
AND I AM WORRIED.....

 

[AKSNOWRIDER]

The threads where the bolt goes to hold the primary on are messed up bad. When pulling the clutch, i tightened the puller so much, it split the end of it, and when i took it out after the clutch popped it messed up the threads bad. i threaded the bolt in today to check if the threads were okay, when i took the bolt back out from what i tightened it in, it stripped half of the threads on the bolt.........i had to impact it out
What should o do? tap it? what is the thread pitch and size? i have no idea what do do
AND I AM WORRIED.....

run a tap through it, make sure you use a thread cutting oil on the tap...and get a new bolt. the crank end is real hard steel it should be fine go slow and easy with the tap...

 

[indydan]

if its as bad as you claim it to be it sounds like you need a new PTO-end.

you could tap it and then try a new bolt and see if it will make it to torque.

if it makes it then you lucked out.

 

[revver]

i hope to frickin god that it taps okay, does anyone know the sizes and kind of tap i need?

 

[AKSNOWRIDER]

i hope to frickin god that it taps okay, does anyone know the sizes and kind of tap i need?

being a doo it should be metric..just take the clutch bolt with you and I am sure you can get it matched up...

 

[revver]

well.......i hope to heck it works, tomorrow im goin to tap it, and ill keep you updated.....
thanks so far

 

[89sandman]

if you can't tap it you can always helicoil it. will give you a set of brand new threads...

 

[ModKat]

Next time you pull your primary just be gental with the pull and go slow. Try taping LIGHLTY on the end of the puller with a dead blow hammer if it is not coming off easily, the light taps should help loosen and pop the primary more easily.

 

[diggerdown]

When you tap it, use plenty of oil and work it in slow. Turn it in some and back it out. Sometimes you only get a quarter turn at a time. If it won't thread, helicoil would be the best bet, but it would almost require a machine shop to do it. You tap it to the next larger size, which would be either a deeper thread metric or sae. Put a class 8 bolt in to torque it. If you had to pull the clutch again you would need to drill a hole through the middle of a shorten pull bolt and put a grease zerk in and use a grease gun to pressure the clutch off.

 

[revver]

done deal, tap worked and it took torque.

for just a note the thread is 14mm x 1.5.

 

[AKSNOWRIDER]

done deal, tap worked and it took torque.

for just a note the thread is 14mm x 1.5.

now...warm the motor up to operating temp..let it cool off to room temp and then retorque bolt..they will sometimes loosen off .....

 

[wildman dan]

thread fix

you might look into a thread insert you can find them online. it requires boring out the hole and re tapping the threads and installing an insert in the threads. it might work i have done it to many ford spark plug holes.if you need anymore help let me know.

 

[Rixster]

If it doesn't hold and you might want to look into having a machine shop weld the hole, and then re drill and tap it. It sounds like you should be good to go.

 

[Barrett]

If it fails again, just use a helicoil designed to redo the original threads. all you doo is drill oversize, then tap with a special tap and thred in the helicoil. VOILA new steel threads in the exact stock size. this will NOT effect the clutch puller as posted above.

 

[Banshee AL]

Use a Bottom Tap

If you can fine one use what is called a Bottom Tap. Use good oil and clean out often.

This will cut threads all to way to the bottom of the hole a regular tap will leave about ½ inch at the bottom that is not rethreaded.

Good Luck