455 harmic balancer bolt

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Jul 10, 2018 | 03:10 PM

matviar

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Joined: Jan 2012

Posts: 126

455 harmic balancer bolt

Seems that the threads are screwed up on the crank of my 455 motor for the harmonic balancer. Does anyone know the size tap I will need to clean em up? It is pretty big bolt. I am guessing 5/8 diameter or more.

Jul 10, 2018 | 03:35 PM

oldcutlass

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Joined: Oct 2009

Posts: 42,475

From: Poteau, Ok

Should be 3/4-16, here is a tap recommended to a member with a similar problem.

Click on the Amazon link.

Amazon

Jul 10, 2018 | 04:44 PM

matviar

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Posts: 126

Thanks Eric. I will buy one!

Jul 10, 2018 | 05:30 PM

OLDSter Ralph

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Joined: Sep 2017

Posts: 5,215

From: St. Paul Minnesota

Be sure to check the first two or three threads on the bolt. I like to keep a small three cornered file around to touch up dings.

Jul 10, 2018 | 06:08 PM

matviar

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Joined: Jan 2012

Posts: 126

I got a new bolt. When I tried to start it by hand, it bound after i turn. I didnt want to force it and ruin the new bolt, si I am going to retap the crank threads. They are slightly burred.