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  1. #1
    Join Date
    May 2006
    Location
    Posts
    170

    Default What is the proper running tem

    What is the proper running temp at gauges for 1988 454? Noticed after about a 1 hour run this weekend gauges were reading about 170-178 (hard to tell exactly). Feel like that is slightly higher than usual but both engines were reading the same and the water temp has warmed to about 81 degrees.

    Are these numbers within range?

  2. #2
    Join Date
    Nov 2002
    Location
    Mullica Hill, New Jersey, United States
    Posts
    1,810

    Default "Yes, you're fine. RWC en

    "Yes, you're fine. RWC engines run slightly cooler 165 or so"

  3. #3
    Join Date
    Jul 2007
    Location
    Sarasota, Florida, USA
    Posts
    37

    Default Nothing wrong with those temps

    Nothing wrong with those temps. I run that down here in Florida with water temps at 90+. 1990 454's.

  4. #4
    Join Date
    Jul 2009
    Location
    Albany, ny, usa
    Posts
    4

    Default would a cracked end cap on the

    would a cracked end cap on the heat exchanger cause a high temp problem

  5. #5
    Join Date
    Sep 2003
    Location
    New Tripoli, PA, USA!
    Posts
    15,200

    Default "If coolant is leaking out, ye

    "If coolant is leaking out, yes.

    Jeff"

  6. #6
    Join Date
    Sep 2008
    Location
    Maryland - USA
    Posts
    6,767

    Default "The caps let you clean the ra

    "The caps let you clean the raw water side of the HX. If coolant is leaking out, time for a new HX."

  7. #7
    Join Date
    Jul 2009
    Location
    Albany, ny, usa
    Posts
    4

    Default could not tell if it was leaki

    could not tell if it was leaking . the heat exchanger is sea water. THe coolant tank was not leaking. JUst the side cape is Cracked but no evidence of water leaking. I have had the Raw water pump off twice. its not leaking and It now has a new impeller going to check all the hoses next

  8. #8
    Join Date
    Sep 2007
    Location
    Egg Harbor, New Jersey, USA
    Posts
    1,574

    Default "Jim, why not just replace

    "Jim,

    why not just replace those side caps and rubber gaskets? AND, once they are off, you can see whether or not any of the core is clogged... a 9/16 wrench and thats it"

  9. #9
    Join Date
    Jul 2009
    Location
    Albany, ny, usa
    Posts
    4

    Default thats the plan Al I am sitting

    thats the plan Al I am sitting home right now waiting for ups guy withnew caps and gaskets. Hopefully thats the trick. Core was very very clean. the boat has always been in fresh water. found a used up zinc and I back washed the oil cooler and did get some crap out of it but not a ton. I put a white sock 0ver the inlet and caught all that came out. Gonna put all back together today. and test run it. if it heats up will check risers and exhaust hose's for collapsed hose. Scratching my head. It seems to be a blockage problem in my mind. Cause it doesn't always happen. But it happens more then not

  10. #10
    Join Date
    Sep 2008
    Location
    Maryland - USA
    Posts
    6,767

    Default "Since the HX zinc was 'us

    "Since the HX zinc was 'used up', I bet the same maintenance philosphy was used for the oil cooler zincs. Unfortunately, when the chunks fall off the oil cooler zinc, they usually get wedged into the water tube openings. they can fall back out but usually don't. The other trouble spot is the elbows. many posts on this board...may want to use the search button at the top to see those details."

  11. #11
    Join Date
    Mar 2008
    Location
    Bellevue, WA, USA
    Posts
    31

    Default My mechanic recommends not usi

    My mechanic recommends not using zincs in the oil/transmission cooler (U-cooler) because the zinc particles can clog the cooler in the long run.

  12. #12
    Join Date
    Aug 2008
    Location
    Fairport, NY
    Posts
    1,625

    Default ""My mechanic recommends n

    ""My mechanic recommends not using zincs in the oil/transmission cooler (U-cooler) because the zinc particles can clog the cooler in the long run."

    Yep, it's the rock and the hard spot. Not using zinc will corrode the copper tubes faster; using zinc will plug the tubes and overheat the engine.

    I use only the original zinc and let it go until I replace the entire unit at 10 years. But, I rinse with fresh water after each use. Even then, the cooler will not last till that 13th season, as I recently found out."

  13. #13
    Join Date
    Jul 2009
    Location
    Albany, ny, usa
    Posts
    4

    Default Ok Guys Problem solved!! Exha

    Ok Guys Problem solved!! Exhaust hose collapsed inside.Replaced all hoses and one elbow.Everything stayed cool. running hard for 1 hour.Thanks to all for your input. I did check everything all you folks threw out there.

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