hey guys i have a 350 one peice rear main seal engine and i need a harmonic balencer bolt for it but i can;t find one. the one i bought was 7/16-20x2 1/4. i am guessing it is metric but summit and jegs has nuthin. also to put it on can;t i just put the bolt in and tightin it down and let it draw the balencer on the crank?? thanks guys. oh yea would a grade 8 bolt from home depot or sumtin work fine or should i get the ones threw the parts store if i can find it? thanls

 

That's the correct size.

You need the right bolt. Most parts stores and speed shops have them, sometimes as a "performance" item.

DO NOT USE THE BOLT TO INSTALL THE BALANCER!!!!! You will almost certainly strip the threads. Use a balancer install tool, aka a piece of 7/16"-20 threaded rod or long bolt, nut, and big thick washer. Screw the threaded rod into the crank as far as it will go, put the washer on, and tighten the nut.

If the balancer is not on far enough to start your tool, you can beat it on GENTLY with a piece of wood to protect it from the rubber getting sheared by the shock.

 

I agree 100%. Take it from a guy who snapped the balancer bolt off in his crankshaft snout, along with destroying the threads. I got "clued in" to the idea that something might be wrong, after using my breaker bar with a 3 foot pipe, and realizing I couldn't unscrew the bolt anymore! So I started unscrewing the bolt, and, SNAP!

Did I mention my mechanic welded my balancer to the crank? That was 3 years ago, still holding, but damn, did I feel stupid.

 

well thats the bolt i have and it doesn't seem to wunt to go in, it seems a big to big. well i will clean out the threads really good tomorrow and see wuts up, oh and by the way thanks for the warning on installing it and thanks for the was to do it lol. *** i love this board.

 

i'd guess you never used a thread protector when you removed the dampner and the first few threads are damaged. chase the threads and all should be well.

 

well the guys i got it off of must not of used one lol. well i got a 7/16-20 tap and put it in there and when i took it out all kindas of dirt, and little shaving came out. i did see that the first threads were messed up. well now the bolt goes in perfect, thanks