Valve blow by??? How can I tell???
Posted January 19, 2006 - 02:17 PM
Posted January 19, 2006 - 02:44 PM
also, you may be able to see some carbon blow by when looking into the throat of the intake. Run a clean white cloth in there and see if you had dark carbon soot that may indicate some blow back into the intake tract.
Posted January 19, 2006 - 03:14 PM
Posted January 19, 2006 - 03:16 PM
Posted January 19, 2006 - 04:31 PM
Posted January 19, 2006 - 06:59 PM
Posted January 19, 2006 - 07:10 PM
how exactly do you do the leak down test??? Any special tools needed?
You need a cylinder leakage tester and shop air to perform this test. The tester consists of 2 gauges and a pressure regulator. When you put regulated pressure in the cylinder (usually 80psi) the second gauge will tell you how much of the air is being held by the cylinder. The engine needs to be set at top dead center and the tester will screw into the spark plug hole. When the air leaks out, you can feel and/or hear it to tell where it is coming from. Less than 10% leakage is good. Anything over 20% requires repairs. Here is an example of a tester
Posted January 19, 2006 - 08:50 PM
Posted January 20, 2006 - 05:45 AM
just what I was going to say....
Dont overlook a tight valve
Posted January 20, 2006 - 07:26 AM