How to Measure to Identify Correct Replacement Grease Seal
Published 11/11/2016
Products Featured in This Question
Question:
Having difficulty installing grease seal on back side of hub for small boat trailer. Have tried tapping with rubber mallet and using a block of wood. Seal is same size as old seal but still no go. Thanks,
asked by: Loyd
Expert Reply:
First, make certain that your new seal has the exact same part number or dimensions as your old one. Seals come in many sizes and can differ as little as a few thousandths of an inch. That small diameter change can mean the difference between a good fit and no fit. Two seals that may appear identical in size to the naked eye could still have slightly different dimensions. It is not reliable to use an old seal to match up to a new one since over time they can become deformed.
If you can remove the new seal from the hub without bending or damaging it, please do so and then inspect the inside hub bore. Look for any signs of scoring or heat damage. Also check for any build-up of residue from grease that may have become very hot and fused to the bore.
You can make sure you have the correct seal by using a precision dial or digital caliper like # PTW80157 to precisely measure the hub bore (for the seal outer diameter) and the spindle (for the inner diameter). You can then use the linked page to select the correct part.
Product Page this Question was Asked From
- Trailer Bearings Races Seals Caps
- Seals
- Grease Seals - Double Lip
- 1.50 Inch I.D.
- 1.99 Inch O.D.
- TruRyde
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