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How to Perform Leak Down Test

Jobondur

Member
My 2008 Wake 215 is lacking top-end speed. It should be going close to 70 and it's only going around 55, but throttle response and acceleration are quite good. I did a compression test and got results on all three cylinders in the 105-110 range, so now I want to perform a leak down test to see if I've got an issue I need to worry about. This engine has been rebuilt and bored to 5mm over standard, so not sure how that impacts the compression readings.

Can someone explain to me in detail how to do the leak down test? I know it has to be done with each cylinder at top dead center, but exactly how do I ensure the cylinder is at TDC? When doing the test, how do I keep the piston from moving? I have the shop manual and found an area that says to "refer to ENGINE LEAK TEST section for procedures" but I can't seem to find where the heck that section is. I have a tester from Amazon arriving tomorrow and would like to understand the entire procedure so I can ensure I do it correctly. Thanks.
 
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