GENUINE FOR HONDA REAR MAIN CRANK OIL SEAL - H/D/B-SERIES B16 B18 H22 D16 VTECGenuine Honda rear crankshaft (main) oil seal. This is a direct replacement, Genuine Part for Honda D, B & H Series engine codes such as D15, D16, B16, B18 H22 etc. The rear main seal doesn't usually fail on these engines however it can happen, resulting in an oil leak into the gearbox bell housing. Rear main oil seals are often changed as preventative maintenance if installing a new clutch kit or undertaking other work which way involve the removal