(1) Poor seal of distributor one-way valve (2) Poor seal of bleeder valve (3) Oil leakage from hydraulic cylinder relief valve or improper adjustment (4) Damage to O-ring of hydraulic piston piston and oil leakage (5) Poor installation, falling or deterioration of O-ring between distributor or cylinder head and housing fuel inlet port lifter
(1) Cleaning the one-way valve, grinding if necessary with a fine grinder (2) Cleaning or grinding the release valve (3) Reconditioning or readjusting the hydraulic cylinder relief valve (4) Replacing the O-ring (5) Checking and replacing the O-ring