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3.5
Section 3
Troubleshooting
3
Leakdown Test Results
Air escaping from crankcase breather ................................................... Defective rings or worn cylinder.
Air escaping from exhaust system ......................................................... Defective exhaust valve.
Air escaping from carburetor ................................................................. Defective intake valve.
Gauge reading in “low” (green) zone ..................................................... Piston rings and cylinder in good condition.
Gauge reading in “moderate” (yellow) zone ........................................... Engine is still usable, but there is some
wear present. Customer should start
planning for overhaul or replacement.
Gauge reading in “high” (red) zone ........................................................ Rings and/or cylinder have considerable
wear. Engine should be reconditioned or
replaced.