Crankshaft pulley bolt broke...

k guys i need some serious help. this has nothing to do with mustangs or mavericks but there are people on here that are very knowledgeable.

k so this is what happened. I was taking off my harmonic balancer to change my timing belt on my 1991 Toyota Celica and the bolt snapped inside the crankshaft. now about 3mm of bolt is sticking out of crankshaft. i have two questions for everyone.

question 1...
is it possible to weld the pulley to the crankshaft?

question 2...
if i were to weld the pulley to the crankshaft, would it throw off the centrifugal equilibrium off so bad that it'll cause breakage.

if you have anyother thoughts on this please add i need alot of opinions..

 

Just drill and eazyout the broken bolt....replace with a new bolt and carry on.
This same thing happened with a 302 on my truck, I didn't have the tools to do it but a shop only charged me $150.00 to do it all and I drove the truck home very happy.
Yeah it was a pain and it cost me but I didn't have to worry about it anymore...nor did the next owner of the truck...if you weld it it is there to stay so don't plan on working on it again...hope ya got a good timing belt that will last and the gaskets or front seal don't leak among other things if ya weld it.
I don't know about the balance issue but I would think it would be off if it's welded extra metal means extra weight.

 

if he doesn't put more weld than what the bolt head weighed then he won't have extra.


...good luck...

 

If enough of the bolt is sticking out that you can weld a nut to it... Do so, then back the bolt out useing the nut as the bolt head. The heat involved should also help to loosen the stubborn bolt. Of drill it out (easy out) or take it to a shop and have em do it...Good luck!!!

 

if the car is worthh a timing belt, my thought is to fix it right. As above drill or weld the nut to get bolt out. So so chance bolt is cross threaded from before, may have to tap out next size bigger. If this is a beater, junkyard repair is weld it up after belt an checking for leaks. Doesn`t matter amount of weld, just have a good welder hit with even uniform bead.

 

i believe it is cross threaded. the bolt should not be that hard to take out. My gun should have been able to take the bolt out easily. the last owner must have ****ed up and just left it. i dont think an easy out will solve my problem since i was trying to get this bolt out for a min or two, before it broke, with my gun.

the car is not so much a beater actually... i need it to drive since it is my daily. if i could get a good weld on this, do you guys think it would hold?

 

could it be reverse thread? just a thought... easily verified with a repair manual... or a replacement bolt.

 

no it is not reverse thread.

 

I`n no welding expert, to get crank hot enough for weld to penatrate you may warp or melt seal. JB Weld may work. Again just try an keep uniform for balance, out of the snout is so-so sorta like a bad pulley. Aint gonna kill ya, just do the best you can do. I would try an drll out first, even if you can get a smaller bolt and washer it. Junkyard repair warranty are only good till you shut the hood!

 

Welding a nut to the bolt will not affect the crank or seal. And JBweld is completely useless for this. It's just epoxy, nothing more. It has no resistence to the application of torque. Welding the pulley to the crank WILL ruin the crank and seal. BAD IDEA.

 

First, try drilling it out. If all else fails, get a nut that will thread onto what little bit of the bolt is sticking out. Thread it on as much as possible, then fill it with weld, making sure to get good penetration into the bolt as well. Soak it down with PB Blaster while it's still good and hot after welding. After it cools, hit it with a good impact wrench, one that has at least 750 ft. lbs. in reverse at a minimum.

 

......too much, that might flip the car on it's side (or on its back)...

......

 

That's what it took to get the bolt out when I did the timing belt on my '88 Accord.

 

i will do exactly this.. thank you and i will let you k now what happens

 

You stand less of a chance of breaking the bolt off if you use a breaker bar than with an impact wrench. Remember that welds make bolts more brittle. I would attemp the welded nut method first - then if that fails use a carbide center drill to drill it out.