gbrown65
Forum Newbie
Posts: 7
Reg: 04-05-12
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04-05-12 07:40 AM - Post#2211604
what is the bolt size that holds the hharmonic on a 68 396 i think i striped it out
Edited by gbrown65 on 04-05-12 07:50 AM. Reason for edit: No reason given.
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 capricesport66
"3rd Year" Gold Supporting Member
Posts: 1208
Loc: Lafayette, Louisiana
Reg: 11-02-03
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04-05-12 07:51 AM - Post#2211607
In response to gbrown65
1/2" bolt.
How did you strip it, trying to put a new balancer on?
Gerald
Lafayette, La.
http://www.flickr.com/photos/95648804@N08/
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gbrown65
Forum Newbie
Posts: 7
Reg: 04-05-12
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04-05-12 07:53 AM - Post#2211611
In response to capricesport66
yes when i did must of bottom the bolt out with impact think the treads are messed up
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capricesport66
"3rd Year" Gold Supporting Member
Posts: 1208
Loc: Lafayette, Louisiana
Reg: 11-02-03
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04-05-12 07:57 AM - Post#2211612
In response to gbrown65
That's terrible news if you did strip it. Means lots of work in a very tight spot or pulling the crank.
One thing that usually needs to be done on a new harmonic balancer is to have it honed a little for the clearance problem. If you do manage to get a new balancer on, you can almost bet that you'll probably never get it off without a serious fight.
Unless you have a different balancer bolt of some sort, you shouldn't have bottomed the bolt out.
Gerald
Lafayette, La.
http://www.flickr.com/photos/95648804@N08/
'66 Chevy Caprice 2DR HDTP 496/4L80e/3.73, 20's, Console, Buckets
'06 Chevy 2500HD 4x4 LBZ Duramax/Allison
'08 Toyota Highlander "Hybrid"
'99 VW Jetta TDI |
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gbrown65
Forum Newbie
Posts: 7
Reg: 04-05-12
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04-05-12 08:00 AM - Post#2211613
In response to capricesport66
you think i can retap and put new bolt in and your rite it mite not ever come off agian maby i can run it without
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capricesport66
"3rd Year" Gold Supporting Member
Posts: 1208
Loc: Lafayette, Louisiana
Reg: 11-02-03
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04-05-12 08:10 AM - Post#2211619
In response to gbrown65
You would do better off calling around to a local machine/engine shop about the retap. It can be done, but there are other questions to ask like about the integrity of the crank itself if more metal is removed. Is the crank iron or steel.
Running an engine without a bolt would be risky as you never know if it will or will not come off. It's a chance I wouldn't take. The key will prevent it from spinning, but what about walk? What if that crank key breaks, then timing would go crazy and possibly cause engine damage.
Gerald
Lafayette, La.
http://www.flickr.com/photos/95648804@N08/
'66 Chevy Caprice 2DR HDTP 496/4L80e/3.73, 20's, Console, Buckets
'06 Chevy 2500HD 4x4 LBZ Duramax/Allison
'08 Toyota Highlander "Hybrid"
'99 VW Jetta TDI |
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ed72073
"3rd Year" Gold Supporting Member
Posts: 419
Age: 39
Loc: Chicago
Reg: 12-08-10
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04-05-12 08:19 AM - Post#2211621
In response to gbrown65
If you retap it you will need a bigger size bolt or maybe a coarse thread bolt (1/2 X 13). If you try and use the original bolt it will not hold because you pulled the threads already. It is pretty easy to drill new hole and tap new threads once you can get a drill in there. You will feel the drill bit bottom out but I would mark the bit so you also know when to stop. To tap it just go slow and take your time and use oil, if you brake the tap have fun.
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Allan In NE
Contributor
Posts: 903
Reg: 12-27-11
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04-05-12 08:31 AM - Post#2211625
In response to gbrown65
Retap the original hole the same size and get a new bolt.
Forget the silly impact. The balancer goes on with a 2 lb. hammer. Listen for it to bottom on the thrust bearing; you can tell when it's home.
Tighten with a ratchet this time and don't get carried away because those threads are gonna be weak.
Allan
| Lifelong GM automatic transmission specialist |
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capricesport66
"3rd Year" Gold Supporting Member
Posts: 1208
Loc: Lafayette, Louisiana
Reg: 11-02-03
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04-05-12 08:53 AM - Post#2211632
In response to Allan In NE
Allan,
Sometimes that hammer won't work. My last balancer wasn't going to get on no matter what. It would stop about halfway. With that said, the different manufacturers are clearanced in different ways. My last job was putting a powerbond sfi rated balancer on a SCAT forged crank. I had to have it honed.
Get an OD/ID caliper and check the measurements. Balancer companies purposely make the bore undersized. My balancer was .005 undersized and would not move on. I had it honed to .002 and it worked like a charm, still tight though.
Gerald
Lafayette, La.
http://www.flickr.com/photos/95648804@N08/
'66 Chevy Caprice 2DR HDTP 496/4L80e/3.73, 20's, Console, Buckets
'06 Chevy 2500HD 4x4 LBZ Duramax/Allison
'08 Toyota Highlander "Hybrid"
'99 VW Jetta TDI |
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capricesport66
"3rd Year" Gold Supporting Member
Posts: 1208
Loc: Lafayette, Louisiana
Reg: 11-02-03
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04-05-12 08:55 AM - Post#2211633
In response to capricesport66
gbrown,
What balancer did you buy? There should be instructions in the box that will tell you about the bore size. With this information, you'll need to measure your crank to see what size it is.
Gerald
Lafayette, La.
http://www.flickr.com/photos/95648804@N08/
'66 Chevy Caprice 2DR HDTP 496/4L80e/3.73, 20's, Console, Buckets
'06 Chevy 2500HD 4x4 LBZ Duramax/Allison
'08 Toyota Highlander "Hybrid"
'99 VW Jetta TDI |
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gbrown65
Forum Newbie
Posts: 7
Reg: 04-05-12
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04-05-12 09:01 AM - Post#2211640
In response to Allan In NE
any idea what size tap and bolt
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gbrown65
Forum Newbie
Posts: 7
Reg: 04-05-12
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04-05-12 09:06 AM - Post#2211642
In response to gbrown65
thanks for the info think i got it figured out
Edited by gbrown65 on 04-05-12 09:07 AM. Reason for edit: No reason given.
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 62chevy427
"7th Year" Silver Supporting Member
Posts: 1499
Loc: laurens sc
Reg: 04-13-06
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04-05-12 09:59 AM - Post#2211667
In response to gbrown65
you should be able to install a heli coil to restore the thread.
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 ss3964spd
"6th Year" Gold Supporting Member
Posts: 3017
Loc: Fairfax, Va
Reg: 12-21-00
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04-05-12 10:05 AM - Post#2211668
In response to 62chevy427
There is a balancer installation tool that should be used to draw the balancer onto the crank. You can also heat the balancer in a pot of boiling water to expand it a little and then apply a thin coat of anti-seize to the crank.
Beating it on does the rear main bearing thrust surface no good.
Dan
If I recall correctly my memory is excellent. My ability to access it is not.
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slammed1
Contributor
Posts: 673
Age: 42
Loc: Ark
Reg: 03-28-12
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04-05-12 04:37 PM - Post#2211769
In response to ss3964spd
Hate to hear you had issues with the crank bolt.A trick I have used numerous times when I didnt have an installer was to place the balancer on a cooking rack and heated it in an oven at 225 degrees,while placing ice on the crank snout,when the crank was cool enough and the balancer was hot enough you can use welders gloves or cooking mits and slide the balancer right on with no pounding with a hammer.
Works great in a pinch,just a little extra time involved.
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gbrown65
Forum Newbie
Posts: 7
Reg: 04-05-12
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04-05-12 07:08 PM - Post#2211856
In response to slammed1
this is a ausome site thanks 
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nicke
Contributor
Posts: 597
Age: 29
Loc: Spokane, Washington
Reg: 01-06-12
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04-06-12 08:14 AM - Post#2212009
In response to gbrown65
Yep, this is all great advice. I have had great luck with the balancer in a pot of boiling water trick.
Also, its interesting that many of our 327's didn't even have this bolt. Though it is a good idea to use one, they came without from the factory.
-Nick
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models916
Frequent Contributor
Posts: 1872
Age: 62
Loc: Addison, IL
Reg: 05-28-10
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04-09-12 06:05 AM - Post#2213022
In response to nicke
Wheel cylinder hone works just fine on the damper. Doesn't take much, go slow.
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Old_Longboarder
Ultra Senior Member
Posts: 12225
Age: 63
Loc: Long Beach Ca, near Vet's...
Reg: 03-28-02
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04-09-12 02:15 PM - Post#2213177
In response to models916
The heli-coil repair is the way to go.
"The most precious jewels you'll ever have around your neck are the arms of your children."
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ss3964spd
"6th Year" Gold Supporting Member
Posts: 3017
Loc: Fairfax, Va
Reg: 12-21-00
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04-09-12 02:23 PM - Post#2213181
In response to models916
Wheel cylinder hone works just fine on the damper. Doesn't take much, go slow.
Wouldn't the stones catch on the woodruff key slot?
Dan
If I recall correctly my memory is excellent. My ability to access it is not.
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busterrm
Contributor
Posts: 976
Loc: Wichita Falls, Tx
Reg: 08-31-10
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04-14-12 11:31 AM - Post#2215054
In response to ss3964spd
I agree with a few of the suggestions, I put my new balancer in pot of boiling water and let it boil for about 20 minutes to get it real hot.
Then while it was boiling, I had a buddy bring it out of the water when I had the crank snout cooled with a bottle of C02 I sprayed all around the snout and got it cold as ice and brought out the balancer and used a installation too and it slid right on.
I had the same problem with a stripped hole on one. Talked to my machinist and he ordered me a new bolt that had a locking set screw in it. Tap the hole regular size and get one of those locking balancer bolts, tighten it till it is starting to tighten then stop and tighten the set screw in the middle of the bolt. Important thing put some thread locker on the bolt and in the threaded hole before installing it, and never use the balancer bolt to turn the engine.
==== BOB ====
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