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Thread: Stage 1 Overheating

  1. 11th February 2012, 06:56 PM #1
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    DaCrabMan
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    Stage 1 Overheating

    the old girl starts to get a bit hot when we get into the soft stuff (talking about the v8 )

    runs normally at mid stick on the temp guage, but as soon as the motion is slow and she's has to work hard, it creeps toward the hot. She hasnt been in the red (as far as i know) as yet.

    Radiator seems fairly new (still has old owners name in white writing), and i'll double check the thermofan is working in the morning.

    Full of decent alloy coolant which seems mixed to the correct ratio.

    Pulled out the thermostat as that seemed to send her toward the hot half of the guage straight away.

    Havnt checked the water pump as yet.

    pulled the oil pan and gave it a clean (very minor scum and rubbish) and replaced oil with a longer range (20-60 i think)

    condisdering the above, where would be a good place to start??
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  2. 11th February 2012, 10:23 PM #2
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    one thing to be aware of is the temp and fuel are fed by a voltage regulator on the back of the instrument cluster. the original lucas regulator was a bimetal strip temperature type thing which pulsed on/off to produce a constant 'average' output voltage.

    what can happen is that if it has the original regulator in there, the regulator can fail and just bypass totally so unregulated voltage feeds gauges where as they are supposed to get like 10V(as per new regulator). This will mean the gauges read high.

    i had an interesting situation on my stage one where the thermostat was opening too soon, but the regulator had failed so it was reading very high up the scale despite not overheating at all.

    one thing that an infinitely useful tool is an IR thermometer for diagnosing cooling problems
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  3. 13th February 2012, 08:57 AM #3
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    i think the IR gun is a good idea - can be used for lots of things i suppose (trying to justify the expense)

    thanks brendan321 - lets see how we go
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  4. 19th February 2012, 10:50 PM #4
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    g'day all

    from chatting to guys on the WA Landies forum, i have worked out that the cooling issue was:
    1. Cheap flexible hose that is supposed to fit all radiators. When the enginer heated, the rubber lost its self supporting properties and kinked at the intake side, effectivly starving the radiator of flow.

    2. The viscous fan was buggered. Gave no more resistance when hot than cold, poot girl was spinning a fan that wasnt spinning back!'

    thanks for everyones help

    crabbie
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  5. 20th February 2012, 03:14 PM #5
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    very lucky man thats all it was as the rover v8 does not like overheating
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