Change of seals

Hello everyone I need to change the front of the front crankshaft of my Toyota Tercel 91 and I would like to know if I can do it with the engine mounted otherwise I need to help me how to disassemble the engine because I have never done it ...

Hello, I tell you that if you can change it without disassembling the engine you only have to disassemble the distribution and take place and with passance you will do it quietly

Thank you very much for the information, now if you have any technical information about the retain and how they take it out .. I want to be sure before disarming since I do not have the workshop manual ..