possible overheating issue updated
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  1. #1
    Administrator Darren West's Avatar
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    possible overheating issue updated

    ive had my truck running for about 12 mins at a guess
    the temp gauge reads 92 and the pipes seem to be under pressure
    there is no fan connected to the water pump pulley at the moment

    do i have issues with the possibility of a head gasket issue of is this normal for that amount of running time
    engine is a 305 small block chevy 1990
    thanks
    Last edited by Darren West; 22-04-2014 at 18:27.

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    Rods 'n' Sods Junkie bunj's Avatar
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    My 305 hits 85/95 within that time scale with no problems. Fresh build though so still waiting for snags.

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    Administrator Darren West's Avatar
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    the hoses seem quite hard also at that temp?
    thanks for your reply

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    I'm Not Jed Clampett stueeee's Avatar
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    Sorry to answer a question with more questions, but a bit more information would help.

    Is your temp gauge sensor in the stock position in the cylinder head?
    Does the rad feel really hot, fairly hot, or coolish when you get the 92 degree reading?
    Do you still have the stock thermostat installed?
    Stuart.
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    Administrator Darren West's Avatar
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    thanks for helping mate
    ok the temp sensor is in the radiator
    yes its far too hot to touch
    i think it does have the std thermostat still installed
    i do have 1 of these spare if you think i should install it

    the metal fan would be 35mm from the radiator
    i do have a 14"fan mounted 10mm from the rad on the other side controlled by a adjustable temp switch and a override in the cab

    thanks
    Last edited by Darren West; 19-04-2014 at 13:34.

  8. #6
    I'm Not Jed Clampett stueeee's Avatar
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    The std thermostat in a late motor is quite likely to be 85 degrees C or thereabouts, so when the water does hit the rad it is going to be hot, with no engine driven fan it's going to get hotter when the truck is standing still; I wouldn't worry unless the electric fan doesn't knock the temperature back when it does cut in..
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    Administrator Darren West's Avatar
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    i can't fit that fan as it will hit the bottom rad hose
    should i loose the stat i don't have a heater in the truck
    ill remove the rad and see if i can get the elec fan right up against the radiator
    just after seeing all those motors yesterday overheating I'm a bit paranoid

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    Official RnS Addict stu460's Avatar
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    Keep the stat. If you remove it all it does is make the engine take longer to get up to temp as you're heating the water in the rad as well as the engine. It will still get hot, just take longer.

    Why is the temp sender in the rad? Until the stat opens you won't get a true temp reading.

    The rad feels hot because it is hot! The water hitting it is at 85 degrees, your body temp is 37. I have always found that the rad hoses feel hard when the engine is hot. They're pumping water under pressure. Are they soft when the engine is stone cold, even when running initially?

  11. #9
    I'm Not Jed Clampett stueeee's Avatar
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    Personally I wouldn't rush to remove the stat, if you really want to, just cut out the centre section, and leave the rest in place; you need some restriction to make the the water circuit work correctly.

    Running with a stat shouldn't be problem as long as you have enough cooling capacity, you would get better engine power (if that's important to you) by changing to a 70 degree stat.

    Not having an engine driven fan isn't a problem as long as your charging system produces enough power for a decent electric fan; I have a 16" fan in front of the rad in my truck, you can almost see the needle move on the temp guage when it cuts in, but it does take 20A running and nearly 30A on cut in, so it's well worth having a relay in the thermostatic switch circuitry if you have a big fan.
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    SBC normal temp is 180f (90C)
    Remove a coupe of plugs and have a look at the colour.

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