Good product! Fit perfectly! No more oil leaks!
Verify the tach drive housing installed is the same as the one shown in the parts manual on Continental Motors IPC page under accessory case for your model before purchase. Working on a O-300-D using an O-300 manual and this seal is not the right size. Other possible seal part number is 641533 with housing 641531
Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.