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Engine Building: Setting Thrust

Old Feb 3, 2022 | 10:59 AM
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Default Engine Building: Setting Thrust

I saw this Powernation video on youtube of a build up of a 4.3L V6 and at 10:30, they start talking about setting the thrust. I've read some books that say to hit the crank with a mallet but never have I seen anyone say to preload it when you torque the main bolts.


Anyone ever do it like this?
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Old Feb 5, 2022 | 05:37 PM
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Originally Posted by psicko
I saw this Powernation video on youtube of a build up of a 4.3L V6 and at 10:30, they start talking about setting the thrust. I've read some books that say to hit the crank with a mallet but never have I seen anyone say to preload it when you torque the main bolts.

In-Depth Build Of An Old School Chevy 4.3L V6 Build - Engine Power S9, E1&2 - YouTube

Anyone ever do it like this?
Yes that’s how I did mine. You preload the crank forward while you torque the mains. The crank will move around a very small amount. Mine came in at .00335. And .0045 if I used a small pry bar to push it all the way forward.

Last edited by jasons69chevelle; Feb 5, 2022 at 06:02 PM.
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Old Feb 6, 2022 | 09:37 AM
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Originally Posted by psicko
I saw this Powernation video on youtube of a build up of a 4.3L V6 and at 10:30, they start talking about setting the thrust. I've read some books that say to hit the crank with a mallet but never have I seen anyone say to preload it when you torque the main bolts.

In-Depth Build Of An Old School Chevy 4.3L V6 Build - Engine Power S9, E1&2 - YouTube

Anyone ever do it like this?
I’ve never done that, but if Pat says to do it that way, it’s the right way.
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