7 won't run after running out of gas
#26
The Doctor
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Location: Cedar Rapids, IA
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As a last resort, try pulling off the header and turning the motor by hand with a breaker bar on the bolt on the front pulley. When the edge of the rotor comes around, make sure the apex seal is springy and all of it is there. Do this with both rotors. This will tell you whether or not you tossed seals.
#30
Rotary Freak
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So lets assume you are using a conventional tester and you are holding down the button or you have removed the valve, and you have good compression on all 3 rotor faces. As each rotor face compresses the A-F mixture the needle will bounce and then drop momentarily and bounce again when the next compression face compresses the mixture, and so on. You would expect to see 3 even bounces with a reasonably healthy engine. However, if one of the seals has failed or is failing, the needle will likely not bounce to the same level for all 3 faces.
See the attached images for a graphic depiction of what a good test (image 1) might look like and a test where an apex seal is failing badly (image 2).
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