Slinger ring on shaft is 1.75. Installed new Timken/National oil seal beginning of last season. #451147H - 1.750 x 2.502 x 0.406. Go to lake for testing, come home top off ratchet with gear oil . One week later walk into shop & theres oil trail coming from back of seal. Rest of season had to top it off before pulling out for lake. Never would be empty but always slowly leaked while sitting in shop. I measure the ID of the seals to be 1.700 out of the box. Do I need a seal with a tighter ID ???