Ford — Cylinder Leakage Test
Testing & diagnosis · Engine
From a Ford service manual — check it applies to your exact model before use.
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Procedure
- Insert the leakage detector in the spark plug hole.
- Bring the piston up to top dead center on the compression stroke.
- Admit compressed air and read the percentage of leakage on the special gauge.
- While air is retained, listen for the hiss of escaping air to locate the leak (intake valve, exhaust valve, rings, or gasket).
Tools required
- Rotunda Pressurization Kit 014-00705 Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Leakage exceeding 20 percent is considered excessive
Source: Ford service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.