Overheating on 350 Mag engine

dhopplesrdhopplesr Frog Mortar creekPosts: 10Member
edited June 9 in Engine Discussions
I've experience overheating one of my engines only after getting up on plane. I could run all day at 8-9 mph and temp would read 175 where should always be. After extensive troubleshooting, we found the "ballcock valve" under each side of the manifolds were rusted and clogged.  This is a FYI so no one else spends the amount of money I did troubleshooting this nightmare problem!!
 
Post edited by raybo3 on

Comments

  • Black_DiamondBlack_Diamond Holland, MichiganPosts: 4,007Member ✭✭✭✭✭
    Why is there a valve there?  No such thing on mine. 

    2003 342FV "Black Diamond", 350 MAG MPI, 20P 4x4 Props, PC BYC, Holland, MI
  • Cableguy GregCableguy Greg Pittsburgh, PAPosts: 2,956Member ✭✭✭✭✭
    Have you changed the impeller on the sea water pump? If you haven't, that would be the biggest reason that the engine would overheat while on plane.
    2008 280 Express Cruiser, 6.2MPI, B3, Pittsburgh, PA
    Go Steelers!!!
  • dhopplesrdhopplesr Frog Mortar creekPosts: 10Member
    edited August 18
    Sorry guys, I should not call it a ballcock valve, it's actually a 3 way check ball component. Mine was clogged up not allowing water to pass thru. There are two on each engine (350 mag). Very easy to access. $65.00 for each one. These little guys should be checked or at least replaced every 5 years.
    Post edited by raybo3 on
  • Black_DiamondBlack_Diamond Holland, MichiganPosts: 4,007Member ✭✭✭✭✭

    2003 342FV "Black Diamond", 350 MAG MPI, 20P 4x4 Props, PC BYC, Holland, MI
  • dhopplesrdhopplesr Frog Mortar creekPosts: 10Member
    Yes...I am surprised my mechanic didn't really know about this. I actually replaced the ones on the port engine also and they were ready to clog up.
  • rasburyrasbury Sanford, FLPosts: 3,674Member ✭✭✭✭
    To many places to have problems...
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