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Checking piston to valve clearance 

 

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 Post subject: Checking piston to valve clearance
Posted: Thu Nov 24, 2005 3:15 pm 
Getting Side Ways
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Now that I've made cam choise and I'm aware of P/V clearance issues, what is the best method to check?

I've been told dummy up the engine....

Use model clay on valves...

Start the engine....

Can anyone give me any more specifics and what I should and shouldn't do.

Cheers

 

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Posted: Thu Nov 24, 2005 4:32 pm 
Getting Side Ways
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What I did was clay the top of the pistons, just around the valve reliefs and put a bit of oil on the valves so they dont stick to the clay. Install the heads (on old gaskets preferably so you don't wreck a set of new ones), install the rockers etc then turn the engine over by hand a few times. Take the heads off and then use a sharp blade to cut through the clay through the thinnest point and measure the thickness.
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Posted: Thu Nov 24, 2005 4:39 pm 
Tyre Shredder
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model clay goes on top of piston. i dont think u start the engine, just turn over by hand

 

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Posted: Thu Nov 24, 2005 4:44 pm 
Getting Side Ways
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Thanks guys, sounds like a pretty easy process.

If the piston doesnt go all the way through the clay, then what would be the thinnest bit of clay that you would take it that it wont hit, considering they might expand in hotter temps. Maybe half a millimeter to a millimeter?

 

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Posted: Thu Nov 24, 2005 4:54 pm 
Tyre Shredder
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minimum of .080" on intake and .100" on exhaust thats wat my crane leaflet says

 

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Posted: Tue Nov 29, 2005 7:23 pm 
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Just had a thought, is it wise to check all pistons or is one or two sufficient?

 

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Posted: Tue Nov 29, 2005 10:29 pm 
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offyaguts wrote:
Just had a thought, is it wise to check all pistons or is one or two sufficient?


One or two would be fine
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