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-   -   Leakdown test (http://forums.pelicanparts.com/porsche-911-technical-forum/53281-leakdown-test.html)

Carlo A 11-30-2001 11:38 AM
Leakdown test
 
What are the chances of bending valves during a leakdown test? motor is a 73RS.

Jim Sims 11-30-2001 11:47 AM
None, if the engine was running correctly before (no bad tensioners, chain ramps, etc.) and the cams and timing chains are left undisturbed. Did your engine get damaged? :confused: Jim

Jim Sims 11-30-2001 11:50 AM
What can happen is a piece of carbon can break loose (taking spark plug out and installing leakdown test rig can cause this) and keep a valve from closing properly and thereby producing poor leak down numbers. :D Jim

john walker's workshop 11-30-2001 11:58 AM
what the heck kind of a test are you running on it?

Carlo A 11-30-2001 01:10 PM
leakdown
 
thanks for the input! motor runs strong. it's in my daily driver 72S. a friend of mine is interested in the motor pending a leakdown or compression test.

Carlo A 11-30-2001 01:19 PM
leakdown test
 
What I was worried about is if the pressure is applied during the leakdown test, is there a chance that the crank can move against the normal direction of rotation and bend valves? thanks.

Jim Sims 11-30-2001 01:28 PM
The pistons and valve train move together in synchronization, forward or backward, nothing will hit as long the valve train is intact and assembled correctly.:D Jim


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