Stripped holes in damper (454) - Team Camaro Tech
Engine General Engine Discussion.

 
LinkBack Thread Tools Display Modes
post #1 of 13 (permalink) Old Apr 21st, 04, 08:37 AM Thread Starter
Tech Team
 
Join Date: Apr 2003
Location: Colorado
Posts: 38
Post

Can you heli-coil the three pulley mounting holes in the harmonic balancer
Without messing up the balancing of the engine (454)

[ 04-21-2004, 02:34 PM: Message edited by: 69' 468-5spd ]

69' 468,510hp dyno'd roller,Doug Nash 5spd,9" ferd 4.11,Posi<br />Hope for mid 11's
69' 468-5spd is offline  
Sponsored Links
Advertisement
 
post #2 of 13 (permalink) Old Apr 21st, 04, 08:57 AM
Gold Lifetime Member
John
 
Vintage 68's Avatar
 
Join Date: Mar 2002
Location: Moraga,Ca.,USA
Posts: 13,705
Angry

I have fixed one or two if necessary - never ran into all of them being stripped.
The answer is yes - if you install the correct length Heli-coil and use loctite Red to install the insert.
I have saved several this way and never had a failure.
Do not try to increase the bolt size.

1968 Convertible
Some trucks
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Other V8 things - some of which float
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Other V6 things - none of which float
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Oh yeah, and 1 "Straight-Six" ...
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


If a man says something in the garage - and his wife can't hear him - is he still wrong !!!
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Vintage 68 is offline  
post #3 of 13 (permalink) Old Apr 21st, 04, 10:05 AM Thread Starter
Tech Team
 
Join Date: Apr 2003
Location: Colorado
Posts: 38
Post

Thanks, I am a little weary of drilling holes in a already balanced damper.

I bought this damper new in a box at a swap meet. I never checked the holes before I sent it down with the engine to be balanced. When I got it back I installed the pulley's (already in the car) and found all three holes to be stripped out. I was using 3/8-16 X 1Ē bolts, are (where) they UNF or UNC threads?

Also I noticed I have a clearance problem with the
pulley's and the front crossmember ('69). I can't
get a belt on it. Is this comon with aftermarket
pulley's?

69' 468,510hp dyno'd roller,Doug Nash 5spd,9" ferd 4.11,Posi<br />Hope for mid 11's
69' 468-5spd is offline  
 
post #4 of 13 (permalink) Old Apr 21st, 04, 10:10 AM
Senior Tech
Bill
 
Join Date: Apr 2004
Location: Raritan NJ
Posts: 1,323
Post

My old 355 had heli coils in the damper and it worked fine.
WildBillyT is offline  
post #5 of 13 (permalink) Old Apr 21st, 04, 11:27 AM
Senior Tech
Gary
 
Join Date: May 2001
Location: Chattanooga, TN, USA
Posts: 7,609
Post

I have stock pulleys on my 69 427, and there's barely enough clearance to slide a belt in the largest one. You have to work the belt back and forth to get the belts on. I am using the original stock (non-interlocking) motor mounts on the correct b/b towers. I looked at later interlocking motor mounts, and they would drop the motor about 1/2". Therefore, they were not an option.
Unreal is offline  
post #6 of 13 (permalink) Old Apr 21st, 04, 11:34 AM Thread Starter
Tech Team
 
Join Date: Apr 2003
Location: Colorado
Posts: 38
Post

I have the BB posts and Moroso solid mounts
with a TH400 rear mount holding a Doug Nash
5speed. With this combo, I have about 1/4"
under there...the belt won't go on without
force.

I'm not worried about the heli-coils, it's the
balancing I'm concerned with.

69' 468,510hp dyno'd roller,Doug Nash 5spd,9" ferd 4.11,Posi<br />Hope for mid 11's
69' 468-5spd is offline  
post #7 of 13 (permalink) Old Apr 21st, 04, 12:02 PM
Gold Lifetime Member
John
 
Vintage 68's Avatar
 
Join Date: Mar 2002
Location: Moraga,Ca.,USA
Posts: 13,705
Post

Quote:
Originally posted by 69' 468-5spd:
Thanks, I am a little weary of drilling holes in a already balanced damper.

I was using 3/8-16 X 1” bolts, are (where) they UNF or UNC threads?
Drilling the holes with the size for the Heli-Coils will not effect the balance.

The bolts are Fine thread. You will of course need a 3/8" X 24 Heli-Coil set.

1968 Convertible
Some trucks
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Other V8 things - some of which float
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Other V6 things - none of which float
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Oh yeah, and 1 "Straight-Six" ...
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


If a man says something in the garage - and his wife can't hear him - is he still wrong !!!
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Vintage 68 is offline  
post #8 of 13 (permalink) Old Apr 21st, 04, 12:10 PM Thread Starter
Tech Team
 
Join Date: Apr 2003
Location: Colorado
Posts: 38
Post

Thanks V-68,
Jim

69' 468,510hp dyno'd roller,Doug Nash 5spd,9" ferd 4.11,Posi<br />Hope for mid 11's
69' 468-5spd is offline  
post #9 of 13 (permalink) Old Apr 21st, 04, 01:21 PM
Senior Tech
Al
 
Join Date: Nov 2002
Location: Vancouver, USA
Posts: 10,511
Post

Quote:
Originally posted by Vintage 68:

Do not try to increase the bolt size.
Just curious - why not? If you did all 3....


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
BPOS is offline  
post #10 of 13 (permalink) Old Apr 21st, 04, 01:39 PM
Gold Lifetime Member
John
 
Vintage 68's Avatar
 
Join Date: Mar 2002
Location: Moraga,Ca.,USA
Posts: 13,705
Talking

Quote:
Originally posted by BPOS:
</font><blockquote>quote:</font><hr />Originally posted by Vintage 68:

Do not try to increase the bolt size.
Just curious - why not? If you did all 3.... </font>[/QUOTE]Well... Because I've had to fix someones attempt to do this. [img]graemlins/clonk.gif[/img]
It's not Balance or that increasing the hole size in the Damper-web reduces it's strength, as much as the Pulley holes also need to be increased for larger bolts.
Getting all these holes properly centered is difficult, at best, with hand tools.

I would recommend the Heli-Coil route. [img]graemlins/thumbsup.gif[/img]

1968 Convertible
Some trucks
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Other V8 things - some of which float
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Other V6 things - none of which float
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Oh yeah, and 1 "Straight-Six" ...
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


If a man says something in the garage - and his wife can't hear him - is he still wrong !!!
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Vintage 68 is offline  
post #11 of 13 (permalink) Old Apr 21st, 04, 02:00 PM
Senior Tech
Don
 
ZZ_430's Avatar
 
Join Date: May 2001
Location: Houston, Texas
Posts: 4,491
Post

Helicoils will be fine.

I thought BB used 3/8 X 16 UNC threads.

Don ~ TC Member #15 ~
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Don't mess with Texas!
ZZ_430 is offline  
post #12 of 13 (permalink) Old Apr 21st, 04, 04:01 PM
Moderator
Bill
 
Join Date: Aug 1998
Location: Waldorf Md. USA
Posts: 3,288
Post

69,
Just curious ... have you driven that thing yet with the Nash 5 spd and the 4.11 gear ?? I have the same trans for my 71 and I figure even a 3.31 gear might be too much with the low first gear of the DN.

Bill Koustenis
Owner
Advanced Automotive Machine
Waldorf Md
1971 Chevelle "Heavy Chevy" original owner


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
BillK is offline  
post #13 of 13 (permalink) Old Apr 22nd, 04, 04:30 AM Thread Starter
Tech Team
 
Join Date: Apr 2003
Location: Colorado
Posts: 38
Post

No not yet but I figure with a 2.02 second
gear that with the 4.11's I would be somewhat close the 2.20/2.54 M-20's and M-21's I ran. On the street I can just start with 2nd gear.

I hope to try it soon, I'm getting anxious to say the least.

69' 468,510hp dyno'd roller,Doug Nash 5spd,9" ferd 4.11,Posi<br />Hope for mid 11's
69' 468-5spd is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome