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Home >> Dodge and Ram >> 2003 >> Durango Base, 5.9 Z, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 91 (3.7L Engine (Service Information)) >> Engine - 3.7L >> Diagnosis And Testing >> Diagnosis And Testing - Cylinder >> Cylinder Combustion Pressure Leakage Diagnosis Chart

Cylinder Combustion Pressure Leakage Diagnosis Chart

WARNING: This page is about a different car, the 2004 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
CYLINDER COMBUSTION PRESSURE LEAKAGE DIAGNOSIS CHART

CONDITION POSSIBLE CAUSE CORRECTION
AIR ESCAPES THROUGH THROTTLE BODY Intake valve bent, burnt, or not seated properly Inspect valve and valve seat.Reface or replace, as necessary.Inspect valve springs. Replace as necessary.
AIR ESCAPES THROUGH TAILPIPE Exhaust valve bent, burnt, or not seated properly Inspect valve and valve seat.Reface or replace, as necessary.Inspect valve springs. Replace as necessary.
AIR ESCAPES THROUGH RADIATOR Head gasket leaking or cracked cylinder head or block Remove cylinder head and inspect.Replace defective part
MORE THAN 50% LEAKAGE FROM ADJACENT CYLINDERS Head gasket leaking or crack in cylinder head or block between adjacent cylinders Remove cylinder head and inspect.Replace gasket, head, or block as necessary
MORE THAN 25% LEAKAGE AND AIR ESCAPES THROUGH OIL FILLER CAP OPENING ONLY Stuck or broken piston rings; cracked piston; worn rings and/or cylinder wall Inspect for broken rings or piston.Measure ring gap and cylinder diameter, taper and out-of-round.Replace defective part as necessary
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