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Broken Crankshaft bolt

9K views 5 replies 4 participants last post by  nstoolman1 
#1 ·
I have 04 Sorento with 202K. Found the crankshaft bolt that broke laying in the garage. Son drove it not knowing, called bitching about the steering being difficult. Got it home with shredded belts and that's when we noticed the bolt lying on the garage floor. Anyway, how in the hell do you get the broken section of the bolt out of the crankshaft? Was going to start removing the radiator and condenser but I might be screwed and declare the vehicle DOA. What's my options for removing the broken section of the bolt?
 
#2 ·
You first have to determine how deep the bolt broke off..

You do not want to drill and try an easy out, it that breaks you are in the hurt locker (hard metal, impossible to drill).

If shallow you may be able to weld a bolt onto the stub and wrench it out..

Other alternatives are machine shop or new crank, both requiring engine dismantling..

.... Philip
 
#5 ·
Dudes selling shit to fix my problem - come on. Here is a brief recap that led to a successful extraction. Took broken section of bolt and put on drilled press and drilled 5/16" hole through the entire piece (bolt width is approx. 14mm). Purpose was to serve as guide for the next step. Bought a left hand drill bit for $8. Fastenal had to order which arrived in two days. Used PB blaster until left handed drill bit arrived. 5/16" bit left plenty of room to avoid the threads and with the guide screwed into the shaft I simply drilled about 1/4" into the section of the bolt that was still in the crankshaft. Doing this avoided wandering of the drill bit and gave me a small cavity for the next step. Removed the guide and engaged drill speed very slowly by slightly tilting the drill maybe 1 degree so it would grab the edge of the cavity in the broken section of the bolt. You can see the bolt turning to my hearts content and it came out with no problems. The broken section of the bolt cleaned the threads as it came out and now I'm ready to replace the crankshaft sprocket and timing belt. The crankshaft has a little key that fits in the harmonic balancer. It was sheared off. The t-Belt wasn't schedule for replacement for another 15K miles but since I'm already into it so I'll just do a complete replacement earlier than planned. Water pump, hydraulic tensenor, idler pulley, etc.

Guys, this worked for me and with a little American creativity and ingenuity that I am sharing it may help others avoid paying dudes shit to fix an auto problem. Pay it forward. Good luck.
 
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