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Posted by Phil Street on Monday, January 14, 2008 at 17:19:55 :
I recently picked up a cylinder leak down tester and tried it out on the 230 in my C3-PW this past weekend. I've been concerned with blue smoke and would like to pinpoint the problem. I did a compression check a couple of weeks ago which showed low compression in number 2, but the other cylinders seemed reasonable, to me anyway.
Being a complete novice it took me awhile to figure out how to run it, and find TDC for each cylinder, and I'm still a little unsure with the results.
I was getting air leakage around the intake valve stem of #1, and air leakage from the fuel pump (weird?) during #6 testing, hard to tell for sure but it seemed that most of the leakage on most of the cylinders was coming around the valve stems. No air was leaking from the carb or exhaust and no bubbles were observed in the coolant.
Hopefully these numbers will display correctly. The first number is the cylinder, next is the leakage in psi, followed by the compression reading.
1 13 105
2 26 80
3 12 119
4 22 120
5 20 115
6 34 110
Pretty obvious there's a problem with #2. #6 is weird, but then again I was getting the air leakage from the fuel pump at that time.
Anyone have any experience with leak down testing on a flathead engine?
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