Important: Do not reuse the crankshaft oil seal. Install a NEW crankshaft oil seal
  during assembly.
Do not reuse the rear cover-to-engine block gasket. Install a NEW gasket
  during assembly.
- Remove the crankshaft oil seal (1) from the rear cover.
 
- Clean the cover in solvent. Remove the sealant from the cover
  oil pan surface. Refer to 
Replacing Engine Gaskets 
.
 
Caution: Wear safety glasses in order to avoid eye damage.
- Dry the cover with compressed  air.
 
- Inspect the gasket sealing surfaces for excessive scratches or
  gouging.
 
- Inspect the cover-to-oil pan threaded bolt holes for damaged threads
  or debris.
 
- Inspect the crankshaft oil seal mounting bore for damage.