What was found
ENGINE ISOLATOR MOUNTS PN 22387 WERE REPLACED WHEN ACFT RESTORED. FIRST ANNUAL AFTER INSTALLATION WITH APPROX 60 HRS TIS MOUNTS SHOWED EXCESSIVE CRACKING AND DETERIORATION REQUIRING REPLACEMENT. LOWER MOUNTS SHOWED THE MOST AMOUNT OF WEAR WITH THE AREA AROUND THE METAL ENGINE MOUNT CRACKED 2/3 THE WAY AROUND, AND PIECES MISSING. WAS TOLD BY ACFT OWNER, HE HAD HEARD THE MOUNT COMPOSITION HAD RECENTLY BEEN CHANGED. NO RECOMMENDATIONS AT THIS TIME OTHER THAN TO CLOSELY MONITOR.