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RB20DET rebuild

By psenevir

· 845 views

I am rebuilding a RB20det engine. When I separated the head from the block I noticed 2 things

 1. This orange sludge was behind the freeze plugs (intake side) and behind the thermostat 

2. the orange stuff was on the valve stems (intake side)

what is the cause of this? Might this be caused by the use of water instead of coolant?

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    GrandMaster Z

    Mark Maras

    Community Member

    It looks like rust. Yes, plain plain water will cause that. Odd that it's only in one cylinder. I'd carefully check for a crack in the head.

    GrandMaster Z

    Patcon

    Supporting Member

    Can this be moved to the appropriate forum?

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