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Head gasket repair, rotating the engine

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Matt98svt, Oct 6, 2024 at 9:09 AM.

  1. Matt98svt

    Matt98svt Junior Member

    Joined:
    Aug 27, 2021
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    Location:
    South Carolina
    Vehicle:
    2015 Prius v wagon
    Model:
    Four
    Getting ready to start the head gasket repair on my 2012 and have been watching the different YouTube videos before getting started. I follow where they line up timing marks and use the shop towel trick to lock in the cams before removing the head. My question is, I want to rotate the engine after the head is off to check that each piston is coming up to TDC. Do I just need to rotate it back to where it started when finished?
     
    #1 Matt98svt, Oct 6, 2024 at 9:09 AM
  2. Tombukt2

    Tombukt2 Senior Member

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    Nov 29, 2020
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    Location:
    Durham NC
    Vehicle:
    2009 Prius
    Model:
    Base
    When you put everything back together you're going to be working with the block or the reciprocating mass on top dead center number one on top dead center and everything works off of that so you need the engine to be able to turn it doesn't make a damn what you do or wear marks are when you take it apart other than if you put everything up on the marks as you're ready to disassemble but lets you see where you are and you're not rotating anything against your valves or anything like that so you just put it on TDC and take it apart once you get the head off then you just be rotating the bottom end the reciprocating mass the Pistons and there's nothing for them to touch hit or anything else You need the very carefully inspect your piston height
     
    #2 Tombukt2, Oct 6, 2024 at 9:53 AM
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