Balancer Issue - bolt or no bolt??? - Team Camaro Tech
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post #1 of 31 (permalink) Old May 8th, 05, 11:21 AM Thread Starter
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Balancer Issue - bolt or no bolt???

I have a '68 327 2 bbl car. It has the original block and (what I thought to be anyway) the original crank in the car. The balancer was pressed on when I bought the car and has been that way ever since (about 6 years). This past week, I did some engine work that necessitated taking off the balancer. It looks as though the prior owner whacked the heck out of it with a BFH to get it on. Anyway, from what I understand, most 327's had pressed on balancers. However, the crank on my engine has a threaded hole (7/16"-20) in it, so I used a bolt to help reinstall the balancer.

My questions are:

1. Does the fact that there is a threaded hole in the crank mean that I should have a bolt holding the balancer on?

2. If there is supposed to be a bolt holding it on, and I simply just press it back on, is there a danger of the balancer actuallly coming off??

Thanks...

Dan
'68 Camaro Convertible

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post #2 of 31 (permalink) Old May 8th, 05, 12:09 PM
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Re: Balancer Issue - bolt or no bolt???

I would say it was probably pressed on for 68, but someone down the line could have drilled and threaded it and used the bolt. What does your builder say about pressing it back on? If it were me, I would bolt it on.

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post #3 of 31 (permalink) Old May 8th, 05, 02:34 PM
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Re: Balancer Issue - bolt or no bolt???

d,
I dont see what the problem is here ? First off all, you should not use the boolt to pull the dampeer on with, you are very lucky that it did not strip, or the damper is too loose. There is a tool that screws into the bolt hole to install the damper with, that is what should be used. As far as using the bolt goes, if the crank has been drilled and tapped for it, then by all means use a bolt. It certainly cannot hurt anything. All Chevy dampers are pressed on, the newer ones also have bolts... what does that tell you .. probably a good idea to use the bolt too.

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post #4 of 31 (permalink) Old May 8th, 05, 03:58 PM
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Re: Balancer Issue - bolt or no bolt???

OK let me set you straight before you hurt yourself or others.

NONE OF THE CHEVY MOTORS HAD PRESS ON ONLY BALANCERS!!!!!
THE BOLT IN THE CENTER IS A GRADE8 BOLT FOR STRENGHT.
IT IS INSTALLED WITH A 1/8 THICK WASHER.
THIS IS TO ENSURE THE BALANCER DOES NOT FLY OFF.
YOU SHOULD NEVER HAMMER A BALANCER INTO PLACE.
THERE IS A INSTALLATION TOOL TO DO SO.
HAMMERING ONLY INCREASES THE CHANCE THAT THE BALANCER WILL WOBBLE OR CREATE HAIRLINE CRACKS.
i seen hammered on balancers while running and the belts would slip off due to the wobble.
heed my advice so no one will get hurt plz.
PUT THE BOLT IN AND USE THE CORRECT WASHER.


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post #5 of 31 (permalink) Old May 8th, 05, 04:24 PM
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Re: Balancer Issue - bolt or no bolt???

Quote:
Originally Posted by dawg

NONE OF THE CHEVY MOTORS HAD PRESS ON ONLY BALANCERS!!!!!
How about the 265 and 283?

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post #6 of 31 (permalink) Old May 8th, 05, 04:42 PM
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Re: Balancer Issue - bolt or no bolt???

Dawg,
Almost all of the Chevy small blocks up until approx 1968-69 did NOT have a bolt to hold the damper in place. They were strictly press fit. Most of the early crankshafts were not even drilled or threaded for a bolt. They worked fine and ran millions of miles like that. All of the Caddy 472/500 engines are the same way. Probably plenty of others, those are the ones I know about for sure. Maybe GM decided to start using a bolt after the HP levels started to climb, who knows. But if you have a threaded crank, you might as well put a bolt in it.

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post #7 of 31 (permalink) Old May 8th, 05, 05:14 PM
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Re: Balancer Issue - bolt or no bolt???

HMM my 283 and 327 all have threaded crank snouts.

im told by a gm parts man that only the early 50 to early 60s V8s were pressed on but since 62 All v8s had threaded snouts.
due to safety factors.


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post #8 of 31 (permalink) Old May 8th, 05, 05:56 PM Thread Starter
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Re: Balancer Issue - bolt or no bolt???

DAWG
This is from Page 6-32 of my '68 Chasis Service Manual:

Torsional Damper Removal

Step 4 "Remove acessory drive pulley, then remove torsional damper retaining bolt (if so equipped).


Bill K

"if you have a threaded crank, you might as well put a bolt in it"

That settles it!!

Thanks Guys...

Dan
'68 Camaro Convertible

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post #9 of 31 (permalink) Old May 8th, 05, 06:43 PM
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Re: Balancer Issue - bolt or no bolt???

I agree with BillK, my 67 did not have a drilled crank. I think drilled cranks started with high perf forged crank applications, then were used on all cranks from 68 up.

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post #10 of 31 (permalink) Old May 8th, 05, 07:53 PM
 
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Re: Balancer Issue - bolt or no bolt???

If somebody hammered the dampner on it would be a good time to replace it. I have seen broken crankshafts because the dampner was installed this way.
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post #11 of 31 (permalink) Old May 8th, 05, 09:56 PM
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Re: Balancer Issue - bolt or no bolt???

what is the "proper" method of installing a damper on an engine that isn't drilled?

you don't plan sincerity.
you have to make it up on the spot.

wanna hear about 20 years ago when i was too smart to know any better?
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post #12 of 31 (permalink) Old May 8th, 05, 10:11 PM
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Re: Balancer Issue - bolt or no bolt???

Quote:
Originally Posted by dawg
OK let me set you straight before you hurt yourself or others.

NONE OF THE CHEVY MOTORS HAD PRESS ON ONLY BALANCERS!!!!!........
1969 Chassis manual only shows bolt torque values for torsional damper on hi-po engines. 6 cyl, 307 and 327 had no bolt by way of reference to bolt torque.

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post #13 of 31 (permalink) Old May 9th, 05, 04:38 AM
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Re: Balancer Issue - bolt or no bolt???

ok I stand corrected
but use the bolt to retain that thing.


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post #14 of 31 (permalink) Old May 9th, 05, 09:30 AM
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Re: Balancer Issue - bolt or no bolt???

Don't know for sure if it's the "proper" way - but I used to use a block of wood over the balancer and wail away with a dead-blow hammer. It's important to aim your blows at the center of the balancer, and to avoid hitting the outer ring.


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post #15 of 31 (permalink) Old May 9th, 05, 09:35 AM
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Re: Balancer Issue - bolt or no bolt???

I have always used the center bolt ... i snug it up nice and tight and then put an oversize deep socket around the bolt so it sits on that big washer tap it a few times with a hammer than snug the bolt back up and tap it a few times with a hammer .. repeat about 50 times and your done LOL

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