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Ben Kallies · 06-04-2012, 05:17 AM

Question: When performing a leakdown test on an engine, how does one stop the 100psi of air pressure from pushing the piston back down in the hole, which in turn moves the crank/cam, opening up the valve, and letting all of the air you just pumped into the cylinder? I tried reinstalling all of the other spark plugs, along with putting the trans in gear, but it still pushes the piston down enough to open the valve back up.

Answer:?

Thanks,

-Ben

06-04-2012, 05:17 AM	#1
Ben Kallies Member Join Date: Jan 2005 Location: Milwaukee, WI Posts: 107 Likes: 2 Liked 0 Times in 0 Posts	Leakdown Testing Question: When performing a leakdown test on an engine, how does one stop the 100psi of air pressure from pushing the piston back down in the hole, which in turn moves the crank/cam, opening up the valve, and letting all of the air you just pumped into the cylinder? I tried reinstalling all of the other spark plugs, along with putting the trans in gear, but it still pushes the piston down enough to open the valve back up. Answer:? Thanks, -Ben