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07-24-2007, 10:11 PM
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#1 |
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Registered User
Join Date: Jul 2006
Location: CA
Posts: 69
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Harmonic Balancer Rubbing Timing Cover
I noticed the Harmonic Balancer/pully on my 250 inline 6 was extremely close to the timing cover. Upon removal of the balancer, deep groves were cut in the cover, and one large crack. Any ideas as to why this would happen, except for someone installing it too close to the cover. Or maybe the thrust bearing is worn out and allowing the crank to walk a little.
Thanks
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70' 1/2 ton 2wd 350/muncie m-20/12-bolt rearend Darin |
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07-24-2007, 10:18 PM
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#2 |
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Sierra Grande Club
Join Date: Jan 2007
Location: New Mexico USA
Posts: 2,433
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Re: Harmonic Balancer Rubbing Timing Cover
Or the rubber on the damper allowed the outer ring to slip & make contact with the cover.
Got pictures? s/t
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1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe. 
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07-24-2007, 11:10 PM
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#3 |
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Registered User
Join Date: Jul 2006
Location: CA
Posts: 69
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Re: Harmonic Balancer Rubbing Timing Cover
My dad and I took another look and we tried to move the crank from the rear of the engine and we are able to move the crank slightly with our hands so we think the thrust bearing is worn beyond spec.
Here are some pics.
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70' 1/2 ton 2wd 350/muncie m-20/12-bolt rearend Darin |
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07-24-2007, 11:17 PM
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#4 |
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Registered User
Join Date: Jul 2006
Location: CA
Posts: 69
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Re: Harmonic Balancer Rubbing Timing Cover
sorry forgot of pics.
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70' 1/2 ton 2wd 350/muncie m-20/12-bolt rearend Darin |
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07-24-2007, 11:21 PM
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#5 |
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Registered User
Join Date: Jul 2006
Location: CA
Posts: 69
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Re: Harmonic Balancer Rubbing Timing Cover
Here are a few more pics.
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70' 1/2 ton 2wd 350/muncie m-20/12-bolt rearend Darin |
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07-25-2007, 11:28 AM
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#6 |
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Registered User
Join Date: Jul 2006
Location: CA
Posts: 69
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Re: Harmonic Balancer Rubbing Timing Cover
Some one has to have an idea.
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70' 1/2 ton 2wd 350/muncie m-20/12-bolt rearend Darin |
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07-25-2007, 12:03 PM
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#7 |
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Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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Re: Harmonic Balancer Rubbing Timing Cover
Balancer only installs in one position. Check the balancer to see if the outer ring is on the same plane as the inner. Only two thing will cause this-thrust bearing or balancer.
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56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
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07-25-2007, 12:23 PM
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#8 |
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Senior Member
Join Date: Oct 2006
Location: Edmonton Alberta
Posts: 458
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Re: Harmonic Balancer Rubbing Timing Cover
from the pic it looks like the crank is way to far back, check the thrust bearing.
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07-25-2007, 02:36 PM
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#9 |
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Registered User
Join Date: Jul 2006
Location: CA
Posts: 69
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Re: Harmonic Balancer Rubbing Timing Cover
Thanks for all the help, it looks like the thurst bearing is worn because we are able to move the crank with our hands slightly. So the engine is going to need a rebuild so I guess its time to put the 350 in.
thanks again
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70' 1/2 ton 2wd 350/muncie m-20/12-bolt rearend Darin |
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07-25-2007, 09:00 PM
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#10 |
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I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,992
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Re: Harmonic Balancer Rubbing Timing Cover
If you can tell the crank is moving by hand then the thrust bearing is worn.Or you may have a bigger problem.
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The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil" |
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