Can Crankshaft be manually tap?

[Showtime Jesse]

Hello fellow DSMers....

I just bought a flywheel bolt kit and thought everything will be ok from there... well....NOPE!!! I am only able to tighten 5 bolts out of seven going into the crank....found out the hole is STRIPPED. (NOT BY ME) but the previous owner didn't tighten the flywheel bolt to specs.. and yea... all seven bolts snapped. For the two screws that didn't screw in... I was wondering will it be ok to just get a tap kit for the two bolts and use some lock rite on the bolts. I going one size up with bolts... which are half inch... I used a calibrator on the stock flywheel bolt and they measure at 12mm.

But my question is .... has anybody did this and do you think that will be ok without taking the bottom end out my engine and replacing the crank? I know the flywheels bolts are a grade 11 but I don't know if the crank is a harden metal?

 

[DSM_PWR]

It "Should" be ok... ive heard of someone doing this before with Honda cranks and have no side effects...

However IMO i would just get another OEM Crank that you can find used for $50 and just get it repolished $25.

Personally i wouldnt want to risk doing it myself, i would at least have a machine shop check it out for me...

 

[Showtime Jesse]

^^^^ Thanks... i'm just tired of replacing parts for this thing. I have only drove it for 117 miles during the first night I had it ! And had the car since early Feb. I'll post back in this topic to give an update on how it works out for me.

 

[snowborder714]

Please do not bump your thread.

 

[Awdboost]

The only thing I would be worried about is have the crank off balance, nor would i even trust this in a higher hp car.. buy a new crank which should be to expensive. Most people just trash the 7-bolts.

 

[kawboy]

Good 7 bolt cranks are hard to find and expensive

 

[crimsondragon]

I personally would try to Helicoil it. You can keep using OEM flywheel bolts this way.

 

[Showtime Jesse]

I personally would try to Helicoil it. You can keep using OEM flywheel bolts this way.

Hummmmm.... Heli-coil.... I never heard of it...but after doing research on that kind of inserts....a feasible theory I will try before I do the re-tap... THANKS a MILLION!!!!!

 

[kawboy]

I don't know how good a helicoil would hold on a crankshaft..

 

[black_gst]

I don't know how good a helicoil would hold on a crankshaft..

i was thinking the same thing i used helicoil before but never on something that gets torqued down to 90lbs

 

[96awdtsx]

Helicoil it for sure. Like someone said watch the balance on it. Yeah you might not take a lot off of it but it could still send it out of balance. Best bet is to get a new crank. If you can't find one let me know and i will get one for you from a few buddies of mine

 

[Showtime Jesse]

I just got a response from a rep at Heli-Coil. And they do NOT recommend that I should use it for the purpose I want to use it for... So now I'm back to tap it or simple buy a new one... The option i'm leaning to is to get a used crank. Thanks for the advice.

 

[snowborder714]

Did they give any reasoning on why it should not be used in this application?

 

[kawboy]

Too much torque and rotational forces from high RPM's I'd assume.

Same reasons why stock bolts in tapped cranks spin out.