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Username Post: How to tell if Harmonic Balancer Bad?        (Topic#257402)
bfr57 
Member
Posts: 164

Loc: Tucson, AZ
Reg: 04-30-04
02-11-11 09:06 AM - Post#2045160    

How can you tell if factory harmonic balancers are good or not? If they look visibly OK, run 'em? I'm just starting a refresh of my .030 SBC and got looking at the balancer last night and wondered about that. I didn't feel any vibes before removing, but it is an early 70's motor. How long can you run them?

 
grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 15991
grumpyvette
Age: 66
Loc: FLORIDA USA
Reg: 03-16-01
02-11-11 09:16 AM - Post#2045169    
    In response to bfr57

the elastomer ring bonding the inner and outer hobs tends to start swelling, cracking and have chunks start to fall out in most cases when they go bad, if the inner and outer ring are not parralel, i.e. the outer ring has moved its an indicator of its failure
" " IF YOU CAN'T SMOKE THE TIRES FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK !"


 
scottsdale84 
Forum Newbie
Posts: 78

Age: 29
Loc: Oakland IA
Reg: 11-19-08
02-11-11 12:52 PM - Post#2045266    
    In response to grumpyvette

for what a new replacement costs i wouldnt even bother reusing it. i would get a new one just for the peace of mind

 
Mister Blue 
"2nd Year" Silver Supporting Member
Posts: 866

Loc: Duluth, MN
Reg: 12-04-07
02-11-11 04:00 PM - Post#2045347    
    In response to scottsdale84

The keyway lines up with the TDC mark on the outer ring. Had a new Professional Products that slipped. Could see that the keyway and TDC did not line up.

 
D.Mac 
Senior Member
Posts: 995

Loc: Ontario Canada
Reg: 03-22-03
02-11-11 04:53 PM - Post#2045383    
    In response to Mister Blue

The keyway is 10 deg before TDC on 1969 and later engines. 2 degrees on pre '69.
Dave MacDonald
Ontario, Canada

'66 Impala LT1/C950-,EFI,700R4,(sold 07/2011)
'12 Sonic LTZ, Turbo, M6
'07 Pontiac Solstice GXP
'06 Caddy CTS-V


 
Brian HHP 
None
Posts: 977

Age: 38
Reg: 12-24-10
02-11-11 05:01 PM - Post#2045387    
    In response to scottsdale84

  • scottsdale84 Said:
for what a new replacement costs i wouldnt even bother reusing it. i would get a new one just for the peace of mind



I agree with this. Dampeners are cheap compared to having one fail and the damage I have seen them do when they do fail. Not too mention, replacing the old factory dampener with a better piece from say ATI, will help your new engine last longer, rev smoother and help prevent any future issues.

My buddies 96' Cobra had it's dampener fail at 7,200rpms and it broke the front off the crank and destroyed everything around it.
Project Sublime - 00' Dodge Dakota, 355/4L60E swap
Co-owner and Engine builder for HHP


 
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