Help Please !!!!

[Nuts]

Can someone please tell me the bolt size and thread count for the bolt that holds the harmonic balancer on ? Thanks Bill

[Bobaloo]

I believe those are heat pressed on, no bolt. (Like the older small block engines).

I could be wrong, I was wrong in 1978 twice.....:D

[Dond409]

Here you go nuts.

http://www.jegs.com/webapp/wcs/stores/servlet/product_10001_10002_59174_-1

[Gearhead99]

7/16 x 20

Just bought one from Chevy Dealership.

[Bobaloo]

Hold on a minute, we are talking about 348's and 409's made from 1958 to around 1965 aren't we? The exploded view in the HOT ROD 348/409 book does not show a bolt or bolts holding the balancer on, it pressure fits the snout of the crank, then the pulley bolts to it. Cutaway view shows the same. What am I missing?

[oil4kids]

when your ready to put that balancer on, dont hit it on with a hammer, the shock will transmit into the crank and loosen your connecting rods nuts and when you least expect it, a nut will fall off your connecting rods and , kaboom

kiss your cylinder walls good bye

use the correct tool to draw the balancer on the crankshaft

http://www.jegs.com/webapp/wcs/stores/servlet/product_10001_10002_751803_-1_10783

[buildit]

Any way to tell where the loose nut will be?:

[Ronnie Russell]

Bob, The 348s I have seen do not have threaded crank snouts. The 409s I have seen do have threaded crank snouts. That does not mean " all" of either. Only what I have seen. In the olden days , it was common to use a 2x4 and BFH to install the balancers because there were no threaded crank snouts. Millions and millions were installed this way. A practice I would never do now, but there was a time when it was done. It is easy to drill a 348 crank when it is in the shop being turned, so no need to pound em on now. Hope this explains some.

[gearhead409]

all 409 cranks were drilled and tapped for a 7/16-20 bolt. 348s were not

[DonSSDD]

Does that bolt only hold the balancer on, and then 3 bolts hold the pulley to the balancer, or can you use the same bolt for both?

Don

[Bobaloo]

Thanks Ronnie and gearhead, since mine is an early 348, and the stuff I referenced is also early "W", you can see where I went wrong. I will have some fun with my mechanic friend today, when I pull this on him. I need to remember two words that will get you everytime, always and never.

[Dond409]

You use the balancer bolt to hold both the pulley and the balancer. The pulley will not go on with the balancer bolt in the way.

[Dick MacKenzie]

Any way to tell where the loose nut will be?:

Behind the hammer! :takethat
:rofl

[dq409]

Any way to tell where the loose nut will be?:


Look in the mirror !!!!!:doh :rofl

[Nuts]

I have ordered the part to repair the installation tool I broke while we were installing mine.

I believe the loose nut, in most all cases, will be me !!!!! (Nuts) :dunno :rofl :rofl