Volvo MP7 D11 Rear Crankshaft Seal Installer Drift Tool 88800561 Alt. This Alternative to OEM 88800561 MP7 D11 Rear Crankshaft Seal Installer Drift Tool is used on Volvo & Mack MP7 D11. 9990113 has been discontinued and Volvo says to use 88800561 and 88800502 instead.