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Old 12-31-2010, 05:07 PM
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Oh..Me I really want to cry.. Help..

Well I just put the new engine in the car. It runs great, but I had a leak at the timing chain/oil pan area. So I pulled everything off the front of the engine and resealed everything. Since I had everything off I decided to go ahead and buy a polished WP, and PS pump along with the March pulleys. Well here is where I want to cry. Like a idiot I put the balancer on and attemted tp use a airgun and the balancer bolt to pull the balancer on. Well I thought there was enough bolt in the thread, but I guess I also cross threaded it to. I Stripped the bolt and the hole on the crank. So my question is can I tap the hole on the crank to the next size and use a different bolt. If so is there a certain type of bolt I need. I need so help here. Someone PLEASE.

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Old 12-31-2010, 05:37 PM
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Drill and tap for a 7/16 fine thread heli-coil. Then use a new sbc balancer bolt.

Front oil leaks on new sbc's are usually the lack of bolt (plug) in the front facing fuel pump/early mount, bolt hole.
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Old 12-31-2010, 06:16 PM
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Is the bolt hole now a 7/16, if so is the hole for heli cor bigger?
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Old 12-31-2010, 06:29 PM
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The drill size for a 7/17-20 helicoil is 29/64".

BUT- if the bolt wasn't into the snout of the crank too far, you can likely use a 7/16-20 tap to clean up the threads, then use an ARP bolt and washer or make a stud- after reinstalling the damper w/the correct tool.

Be sure to check the woodruff key and grooves for any burrs, etc. and to be sure the snout of the crank and the damper ID is free of any foreign material, burrs, etc..

There was a lengthy conversation about a similar thing HERE, you may get something useful from reading it.
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Old 12-31-2010, 08:27 PM
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Just like Cobalt mentioned, if the bolt wasn't in very deep and only ruined the threads a few deep, the hole can be clean-up tapped and tapped deeper than factory, then you just use a longer bolt. ARP's bolt is longer than stock.

If that's not possible, the helicoil is next in order. Helicoil may require you to slightly drill the hole bigger, I can't remember for sure on the 7/16-20 size helicoil, the Helicoil kit's tap tells right on its shank what the drill size for it is.
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Old 12-31-2010, 09:54 PM
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i prefer using a stud over a bolt, even if the threads in the crank aren't hurt to start with.

in the other thread, i don't agree with using Red Loctite.
the stud will need to be removed if/when the balancer ever needs to come off again.
from the Loctite web site, "Loctite® Threadlocker Red 271™ is designed for the permanent locking and sealing of threaded fasteners. It is only removable once cured by heating up parts to 500°F "
permanent, not a word i want to see for a part i may want/need to disassemble some day in my driveway.
heating up parts to 500°F in the car is also something i wouldn't want to do either.

if your going to use Loctite, Blue Loctite is good enough, and when the need comes up, you can remove the stud.
personally, i use Permatex ultra copper to keep my balancer stud from coming loose.
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Old 12-31-2010, 09:54 PM
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Correction

Quote:
Originally Posted by cobalt327
The drill size for a 7/17-20 helicoil is 29/64".
Should read "The drill size for a 7/16-20 helicoil is 29/64."

Unless the helicoil instructions say otherwise.
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Old 01-01-2011, 07:15 AM
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If you end up "chasing" the threads, you might want to read this thread. Rather then use a tap cutting tap, use a thread chasing tap:Thread chaser Vs. Tap


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Old 01-01-2011, 07:25 AM
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By all means, use a thread chasing tap...stud OR bolt...and be REALLY, REALLY careful. The last thing you want is to break the tap in the crank...
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Old 01-01-2011, 08:37 AM
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Along with using the proper stud/balancer install tool to draw the balancer on,
heat up the balancer in a big pot of boiling water on the stove to expand the hole. Use Kitchen oven mitts to handle it. Install hot.

About 1/2 hour in a pot of water on the stove should do it.
Season as required.
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Old 01-01-2011, 08:49 AM
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Careful,,,that is a sure way to put a damper on your soup recipe Fbird...groan
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Old 01-01-2011, 05:16 PM
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Yikes! I hope you learned your lesson on installing balancers. Never ever use the bolt to put it on. I would hammer it on before i used the bolt to put it on. Good luck with the repair.
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Old 01-02-2011, 06:53 PM
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Well I actually taped it to the next size (took a few hours went slow...) It is all on now, just hope the exra size bolt don't add any unwanted balace issues. I don't think it will.
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Old 01-02-2011, 07:03 PM
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That is some good news, balance will not be effected.. I am betting you will never do that again .. Got the tool to install the balancer ?
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Old 01-02-2011, 07:21 PM
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Yes got the tool , and installed the balancer no problem. The new March pulley looks sweet.
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