timebombprod
Forum Sage
How do I know.if I'm on compression stroke to do a leakdown test?
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How to tell if I'm on compression stroke
- Thread starter timebombprod
- Start date
G
Guest
Guest
Maybe remove a spark plug and turn the engine until you feel air coming out?
timebombprod
Forum Sage
Maybe? Hmmmm
G
Guest
Guest
That will get you TDC, but unless you watch the valves, you won't know if it was the compression or exhaust stroke.
Put your thumb over the plug hole.
Gotcha....
G
Guest
Guest
Since that response was related to using a dowel to visualize the movement, it would be just a wee bit ... difficult to put your thumb over the hole.
Killer2600
Forum Apprentice
Great methods given but I'm going to go at this another way. You're doing a cylinder leakdown test, so set the piston at TDC and run your test. If you get leakage rotate the crank 360? and run the test again. The test that leaked less is/was your TDC compression stroke.
G
Guest
Guest
Or, ... if you simply look through the spark plug hole before screwing in the gauge, you can see the valves to tell whether they are open or not.
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