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  1. #1
    Join Date
    Nov 2008
    Location
    Fond du lac , WI, USA
    Posts
    11

    Default "1969 lm318 overheats, raw wat

    "1969 lm318 overheats, raw water cooled, sherwood D-60 pump, Thermostat removed no changes. Once warmed up gauge occaisonally dips slowly down to to 140 then slowly creeps back up to 180 or slightly higher. Please help!

    Steve"

  2. #2
    Join Date
    Nov 2008
    Location
    Fond du lac , WI, USA
    Posts
    11

    Default "What temperature should the g

    "What temperature should the guage read?
    Should it stay constant while holding the same rpm?

    Someone else suggested capping the hose that goes from the thermostat to the supply side of the pump, can the engine be run like this?"

  3. #3
    Join Date
    Sep 2003
    Location
    New Tripoli, PA, USA!
    Posts
    15,272

    Default "..."Someone else suggeste

    "..."Someone else suggested capping the hose that goes from the thermostat to the supply side of the pump, can the engine be run like this?"

    If that's a dual pocket pump, no! The water coming out of the pump has to go somewhere. Unlike normal circulating pump arrangements, this is a positive pressure pump that can not be "backed up" against a closed off flow.

    A few suggestions:

    1. IF that is a dual pocket pump setup, be sure the line running back to the pump is clear.

    2. Check for any air leaks going to the pump, like from a strainer cover, leaking sea cock valve, loose hose connection, etc. ANY air coming will cause all kinds of problems.

    Jeff"

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