Leak down test

Dimitri16V

Top Post Dawg
Joined
Jan 30, 2005
Location
DE
TDI
01 Golf, 04 Golf
400 psi ? I would have to lock the engine to keep it from turning
 

hughesjasonk

Veteran Member
Joined
Nov 8, 2013
Location
New York
TDI
2002 Jetta MK4;
400 psi ? I would have to lock the engine to keep it from turning
the piston is going to be in the up position with the valves closed.

It isn't going to be 400 psi. probably around 100psi but i have to look at the book to be sure.

a leak down test is not the same as a compression test.
 
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RIP TDI

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Joined
Feb 16, 2000
Location
Santa Barbara, CA
TDI
'15 GSW SE 6MT, '01 Golf 5MT, '97 Passat sedan, '96 Passat variant
Leak-down testing is usually done at TDC on compression.

If using a dedicated-use leak-down gauge (i.e., graduated in percentage), the gauge manufacturer usually specifies the line pressure at which the gauge is calibrated to read most accurately.
 
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