my car started knocking, so i called cory (oilpool) to investigate..

here is what found:

 

holy ****. how did that happen? are the threads gone in the engine side?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by alpine_hikr &raquo;</TD></TR><TR><TD CLASS="quote">holy ****. how did that happen? are the threads gone in the engine side?</TD></TR></TABLE>

the threads are still there so im considering still using the crankshaft unless someone else thinks its really bad idea...


Modified by swatteamtimmah at 11:43 PM 3/17/2006

 

The bolt holes look elongated? If they are elongated how can you re-use the crank? If you really want to use that crank again, you can weld material in the bolt holes and then re-tap them. Seems like a lot of trouble and it must be very accurate or else you will get a shimmy or imbalance....Might as well find another crank.

 

That crank for the most part is trash now, I'm really surprised that nothing happened sooner. Great time to build a bigger motor. Good Luck with whatever you choose.

 

wow. you can even see in the last pic where the bolts were wanting to rip out of the threads.

I've heard rumors of a drag racer getting killed by a flywheel busting loose and flying through the cabin and you know the rest goes. That was on an old muscle car dragster. I was thinking about that and they must have had a shitload of torque on that thing for it to break the flywheel bolts. But then again it could just be a rumor. But then again it could be some jackass using grade 1 or grade 5 bolts.

but this is a honda we're talking about

 

Yikes thats all f'd up. If I were you I would definately chuck that crank. What you have to ask yourself is why that happened. What motor are we talkin about here....is it stock?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Creator &raquo;</TD></TR><TR><TD CLASS="quote">Yikes thats all f'd up. If I were you I would definately chuck that crank. What you have to ask yourself is why that happened. What motor are we talkin about here....is it stock?</TD></TR></TABLE>


b20z2..its stock to...everything was torqued down to spec in a star pattern...its wierd as hell i used brand new bolts and everything...

 

Seeing the some what fresh grinding marks on the flywheel clutch surface makes me think whoever did the clutch job did not torque the bolt right. Maybe a problem with the torque wrench. Dan

 

someone once said that a dragster pretty much shattered his flywheel and killed somebody with the shrapnel. i think its just a myth tho.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by KraZEtEggIE &raquo;</TD></TR><TR><TD CLASS="quote">someone once said that a dragster pretty much shattered his flywheel and killed somebody with the shrapnel. i think its just a myth tho. </TD></TR></TABLE>Something liek taht came from somehwere. Scatter shields on fast cars arent required just for fun you know.

 

that crank is trash now, the cost of repairing it far outweighs the cost of just getting a new crank. B20/B18 cranks are hella cheap.

 

looks like someone reused stock A/T flywheel bolts, was the b20b an automatic? Might wanna use flywheels bolts that are stamped 23!!!!

 

everything was torqued down correctly i did it myself using a torque wrench and brand new b18b m/t flywheel bolts.

 

This is why we all should be running scattershields. Imagine if the flywheel let loose. Pieces would be flying everywhere.


Modified by msmotorsports at 8:46 AM 3/20/2006

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by reddevil94 &raquo;</TD></TR><TR><TD CLASS="quote">looks like someone reused stock A/T flywheel bolts, was the b20b an automatic? Might wanna use flywheels bolts that are stamped 23!!!!</TD></TR></TABLE>

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by reddevil94 &raquo;</TD></TR><TR><TD CLASS="quote">looks like someone reused stock A/T flywheel bolts, was the b20b an automatic? Might wanna use flywheels bolts that are stamped 23!!!!</TD></TR></TABLE>

FTW!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by swatteamtimmah &raquo;</TD></TR><TR><TD CLASS="quote">everything was torqued down correctly i did it myself using a torque wrench and brand new b18b m/t flywheel bolts. </TD></TR></TABLE>

aka the flywheel bolts stamped 23

 

Are you not supposed to use Locktite on the flywheel bolts?

 

The San Diego Hydroplane races, blown motor, found flywheel wedged into a car.
Almost a mile away. BTW it went through two other cars before it stopped in the third.

I know this is a true story it was my friends sisters car and I saw the newspaper that ran the story.

Please don't mess with that crank. When the flywheel started to wobble it probably took out the bearings.

 

my guess..

The bolts where too long.. they bottomed out.. you thought you where torquing them down.. in fact they where bottomed out. then the flywheel could move back and forth... over time it rounded the wholes..

You can see the bottom of the threads on the bolts... there fucked.. why would the bottom of the bolt be the most fucked up?.. should be the clean part of the bolts. ..

i had seen something like this once before.. but it wants this bad...and it was becuase they used auto flywheel bolts and they walked out...

in your case.. it looks like the flywheel was never tight... just the bolts where.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by havok hybrid &raquo;</TD></TR><TR><TD CLASS="quote">my guess..

The bolts where too long.. they bottomed out.. you thought you where torquing them down.. in fact they where bottomed out. then the flywheel could move back and forth... over time it rounded the wholes..

You can see the bottom of the threads on the bolts... there fucked.. why would the bottom of the bolt be the most fucked up?.. should be the clean part of the bolts. ..

i had seen something like this once before.. but it wants this bad...and it was becuase they used auto flywheel bolts and they walked out...

in your case.. it looks like the flywheel was never tight... just the bolts where. </TD></TR></TABLE>


I think this was the problem as well. You can also tell by the uneven wear on the flywheel surface. Once the clutch tried to engage under load it just chattered the hell out of the surfaces.

 

so the bolts were stamped 23??????? They look kinda short in the pics, this is the reason why I said they were probably a/t bolts....

 

the bolts do look short are you sure there the wright size in the pic it looks like the bearly come through the flywheel and the crank looks like they didn't get anuff of the treadst o hold

 

im also guessing the bolts were bottomed out. maybe try and thread one back in and see how far they go before they bottom out.. see if the unthreaded portion is more than the thickness of the flywheel

EDIT: after looking at them some more i think they are to short.. were the flex plate bolts rather than flywheel bolts? if u have a vernier caliper or something measure from underneath the head to the end of the bolt (in mm)