Just got my truck running and used some hardware store bolts (said they were better than grade 8!) and somehow they all broke off at the crank...now I have little pieces of bolts stuck in the back! I don't know if I need a whole new crank shaft or not. What should I do? Thanks

 

LMAO sorry but yeah ide go back and B*%$ch them the F*$#ck out for telling you they were better, the only thing i can think of is go to a carpart store and get an easy out set

 

Did you hand tighten them again? : Sorry.

 

this must be why your truck could roll in gear after your wheeling adventure

 

lol...yeah no kidding. Did you know I have the worst luck?

The one thing I torque to spec actually breaks

 

can i ask why hardware store bolts? closer than the autoparts store?

 

Just messing with you. I'm quite surprised they broke, when you consider the engine is only turning with 1/40 the amount of force at the wheels (but 40 times faster), it would seem to me that they wouldn't need to be that strong. There are only 4 10mm bolts holding the driveshaft to the output of the tranny and the input to the diff. So why did 6 (?) >10mm bolts break with less force being applied?

Did you drop the clutch when it broke?

 

why would you use cheap bolts to mount something so important?????? the toyota bolts are specially hardened to resist torque to the side of the bolts, not just stretche from torqueing them in. they only time i use aftermarket bolts is bumpers and fenders man. Did you loose the original bolts?

 

maybe the bolts were too strong and you needed like grade 5 so the bolts can flex. the greater the grade, the more brittle they are and cant flex as much.

 

The main job of the bolts is to clamp the flywheel to the crank. Once clamped this way, the flywheel shouldn't shift relative to the crank, so they shouldn't need to be particularly resistant to sideways force.

 

What was wrong with the original bolts?

Are you sure the new ones weren't too long?

If too long they would bottom out in the crank and there would not be enough clamping force on the flywheel causing them to sheer.

65 ft pounds right?

 

Maybe that happened...I don't know. I had to get new ones because I did an auto to manual tranny swap. And the flex plate is thin compared to the flywheel.

No one around me carries flywheel bolts in there auto parts stores so I went to a hardware store for grade 8 bolts. Then, the dealership wanted $8 a bolt.

 

I can't get the bolts out of the back of the crank...so its either replace the crank or just get rid of the truck all together/engine swap. I'm sick and disgusted at Toyota's right now. I don't want to look at them.

 

You need to get the bits of grade 8 bolts out. then you need to rethread it. get a tap.

 

... i really hope you didnt put grade 8 bolts in it.. Grade 8 would necessatate a SAE bolt.. not metric.. if so maybe you some how got a sae bolt to go into metric threads and tore up the threads enough to cause them to loosen up and break. 10.9 is the metric equivilent to the sae grade 8.

 

They make metric grade 8 bolts, I used to sell them all the time at the napa I worked at...

 

I've heard 10.9s described as "better than grade 8" before, so presumably that's what he did. You wouldn't get it threaded with SAE obviously and I'm certain he didn't do that.

I'm going to guess the bolts bottomed out precisely at the point where they were providing some clamping. I'm still surprised they sheered off like that.

Trevor, can you provide us with some pictures?

 

Well, unlike the TITANIC, you made it home. Might I make a suggestion, go to the dealer and buy the correct bolts. Some times you can't beat dealer items......and are worth the money,if for nothing else, for the piece of mind.....ya know?

 

me too is what was wrong with the original bolts?...
here, figure out what grade bolts you bought:
http://www.engineersedge.com/hex_bol...tification.htm

but you should be able to get them removed with an easy-out. if the head sheared off there should be little to no force on the threads (and you could probably use a center punch if you were determined to spin them out) so should come out fairly easily.

 

He said he swapped in a 5spd. I'm betting the torque converter doesn't use the same bolts as a flywheel.