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Farmall & IHC Tractors Discussion Forum
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Paint Dot inside piston

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Ben in arkansas

08-21-2006 09:26:39




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Got new stepped pistons for my 52 Super C with my overhaul kit and installed them. I then realized that there is a red paint dot on the underside of the new pistons. Should pistons have dot facing front or back of engine or does it not make any difference? Looks to me it doesn't matter from top. Pistons look symmetrical from the top. Thank you for your know how!




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Ben in arkansas

08-21-2006 12:42:58




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 Re: Paint Dot inside piston in reply to Ben in arkansas, 08-21-2006 09:26:39  
Didn't see any arrows. I didn't torque caps so I can easily reposition. I'll study it more. Thanks



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the Unforgiven

08-21-2006 11:08:32




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 Re: Paint Dot inside piston in reply to Ben in arkansas, 08-21-2006 09:26:39  
Don't know about the dot for sure, but it probably does make a difference. Most pistons have a minor and major thrust side, and if the pin is not centered you will end up with a goofy rod angle to stroke ratio.



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Red Dave

08-21-2006 09:42:50




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 Re: Paint Dot inside piston in reply to Ben in arkansas, 08-21-2006 09:26:39  
Most stepped-head pistons I've seen had an arrow and the word "front" to indicate the way to put them in. What did yours have on them before you installed them?

Another way would be to look at the head. If I remember correctly, the head has a distinct combustion chamber and the stepped part of the piston has to fit into it. The pistons will hit the head if they are in wrong.

If you still can't tell, place the head on the block with no gasket or nuts on the studs. Turn the engine over gently by hand and see if anything hits.

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