355 - Best way to rotate engine | FerrariChat

355 Best way to rotate engine

Discussion in '348/355' started by kryten2001, Sep 20, 2023.

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  1. kryten2001

    kryten2001 Formula 3

    Hi Guys

    I want to do my own leakdown test at home, so am just enquiring as to the best way to manually rotate the engine to get TDC? I don't want to use the starter and would prefer to do it by hand so I don't need to mess with disabling the fuel pump/injectors etc...

    What's the best method? Pull all the plugs, put it in a high gear and rotate the rear wheels? Can the crank be turned underneath the car (is there enough clearance?)

    What have you guys done?

    I know I could just take it to the dealer, but where's the fun in that.
     
  2. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    13,570
    San Carlos, CA
    Full Name:
    Mitchell Le
    6 th gear, push the car without plugs out. There is no room under the car for a wrench/socket.
     
    kryten2001 and Qavion like this.
  3. kryten2001

    kryten2001 Formula 3

    OK to do it when on stands (Can you turn just one wheel?).. Rolling the car around on the ground isn't really the best approach....
     
  4. kryten2001

    kryten2001 Formula 3

    Also what's a good figure for compression and leak down numbers on a 355 engine? My understanding is that leakdown is a lot lower than regular cars due to a very small piston ring gap - is that right?
     

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