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Decided to do transmission service. Removed all the bolts but this one wouldn’t budge and snapped inside. I need serious advice, thanks to all that contribute. Here are photos
With that much exposed I would use a dremel and cut a line through across at the midpoint and see if a large flathead could get it out or a ratchet with a flathead bit. Spray pb blaster on it repeatedly first and give it many light taps with a hammer before trying. Or maybe call a highly rated mobile mechanic.
With that much exposed I would use a dremel and cut a line through across at the midpoint and see if a large flathead could get it out or a ratchet with a flathead bit. Spray pb blaster on it repeatedly first and give it many light taps with a hammer before trying. Or maybe call a highly rated mobile mechanic.
Actually first thing I did was cut a line through the middle with a mini hand saw. when I spun it with screw gun, the bolt didn’t budge but broke even more instead. I sprayed wd40 from on top of the bolt, the threads is actually open all the way through. How should I tap it with the hammer? I don’t want to damage the threads.
I had to drill out one of bolts as well. The thread was ruined, so I replaced with a new bolt and nut. I had replaced all other bolts with new ones because old ones were corroded.
I had to drill out one of bolts as well. The thread was ruined, so I replaced with a new bolt and nut. I had replaced all other bolts with new ones because old ones were corroded.
How did you drill it out? What tools did you use? The bolt on mine has no head. Yeah man, these bolts are cheap af. Even the drain and level bolt are corroded
With that much exposed I would use a dremel and cut a line through across at the midpoint and see if a large flathead could get it out or a ratchet with a flathead bit. Spray pb blaster on it repeatedly first and give it many light taps with a hammer before trying. Or maybe call a highly rated mobile mechanic.
Hell no. You need to weld a nut on at this point and use a torch to heat the trans side threads to get it to break loose. You do not want to further reduce the amount of material you have to work with and a little slot will provide far less force to work with than the bolt head that already snapped off
EDIT: never mind, I see you already broke it off more. You may need to helicoil the trans now but there is not a lot of material to work with and you may have screwed yourself
I had to carefully grind it down to create flat surface. Then I used a center punch to mark the center. After I used multiple drill bits staring with undersized and ending with same size as the bolt to create a through-hole. I tried using multiple extractors but none has worked for me.
You probably will need a drill guide to maintain normal direction of a drill bit to the surface.
Hell no. You need to weld a nut on at this point and use a torch to heat the trans side threads to get it to break loose. You do not want to further reduce the amount of material you have to work with and a little slot will provide far less force to work with than the bolt head that already snapped off
EDIT: never mind, I see you already broke it off more. You may need to helicoil the trans now but there is not a lot of material to work with and you may have screwed yourself
yes, it snapped while trying to loosen the bolt. If look at the photos, you’ll see the threads are corroded halfway into the threads. Thanks for the encouragement
Originally Posted by Anfanger
I had to carefully grind it down to create flat surface. Then I used a center punch to mark the center. After I used multiple drill bits staring with undersized and ending with same size as the bolt to create a through-hole. I tried using multiple extractors but none has worked for me.
You probably will need a drill guide to maintain normal direction of a drill bit to the surface.
I think this is my only option. I hate this option! Drill bit guide is very smart idea. I’ll try, damn I was under there for 3-4 hours trying to remove it.
I would not try any technique until I tried a simple vice grip on what’s remaining of that bolt and turn it counter clockwise. That bolt is not corroded into those threads, it just snapped because the exposed end was. Now that the pan is off there is no tension on that remaining bolt and threads. Usually they’ll come right out...if not?? Ok, yeah, then try everything else.
Either way, not a lot of fun, but it could be a lot worse.
A left handed drill bit is the reverse to a normal drill bit and so you use it in reverse, so if the drill bites into the material there is a chance that the drill bit will remove the broken portion of the bolt. This is the left handed drill bit that we are going to use.
I would not try any technique until I tried a simple vice grip on what’s remaining of that bolt and turn it counter clockwise. That bolt is not corroded into those threads, it just snapped because the exposed end was. Now that the pan is off there is no tension on that remaining bolt and threads. Usually they’ll come right out...if not?? Ok, yeah, then try everything else.
Either way, not a lot of fun, but it could be a lot worse.
tried vice grips, they are eating away at the bolt and it’s not budging! Yeah you’re right about where the corrosion was on the bolts
Originally Posted by RayLS
@ Zetascry. Try using a reverse drill bit - also called left-handed drill bit.
A left handed drill bit is the reverse to a normal drill bit and so you use it in reverse, so if the drill bites into the material there is a chance that the drill bit will remove the broken portion of the bolt. This is the left handed drill bit that we are going to use.
headed to hardware store now. I’ll make sure to look for this. If I slightly scratch the mating surface of transmission pan, can I apply some high temp seal maker to be safe?
When I had this happen on my GS, I just drilled it out to a bigger diameter. That was after I tried welding a nut on, I recommend trying that first.
Damn I’m trying to drill it out, bits are broken. Did you thread the bigger diameter hole for a new bolt or did you throw on a nut on the opposite side to tighten the bolt against the pan?
Broken bolt inside transmission
