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Thread: High Engine & Exhaust Temperatures - P76 V8

  1. 3rd September 2018, 02:56 PM #1
    drover81
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    High Engine & Exhaust Temperatures - P76 V8

    I'm getting high engine temperatures (90degC+ - up to 105 before I shut it off) and really high exhaust temperatures. The exhaust got so hot it started melting the insulation off the power cabling to the starter motor!

    The car has been sitting idle for about 2 months due me not using it (injury - don't ask!), so I took the time to swap the throttle body out for a Holley Sniper and am just getting it going (learning).

    As part of the Holley Sniper install, I had to grind off/drill out the WBO2 bung as it had rusted solid. When I got about halfway through, I drilled the bung and it fell into the exhaust...

    I plan on testing the thermostat first and ensuring the timing is set at about 10-12degC@idle.

    Any other ideas/things to test?
    Current: ‘16 Disco Sport (7seater) aka « Family Bus 2 »
    Sadly Gone: '77 RRC 2 Door aka "Beast"
    Gone: '92 RRC Vogue SE aka "The Family Bus"
    Long Gone: '99 Td5 Defender aka "The TANK!"
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  2. 3rd September 2018, 05:12 PM #2
    bee utey's Avatar
    bee utey
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    Some P76 blocks were poorly finished where the coolant flow goes into the back of the head. A die grinder or rat tail file is needed to clean up the casting dags to improve water flow.

    Then there's the water pump, the 3.5 pump is usually fitted and does not push enough coolant. A smaller water pump pulley speeds up the pump and fan. I made one up for an early Rangie years ago out of a Holden air pump pulley, helped quite a bit.

    As for the bung up the exhaust pipe, you know what to do there, take the muffler off and go fishing.
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  3. 6th September 2018, 08:12 PM #3
    drover81
    drover81 is offline Master Subscriber
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    Thanks - looks like the timing was waaayyy out (like ATDC) and maybe the magnetic pickup polarity was back to front.

    Also found the PO had installed a 71degC thermostat, so I swapped it for an 82degC I had on the shelf.

    Idling as smooth as butter now and comfortably below 90degC.
    Current: ‘16 Disco Sport (7seater) aka « Family Bus 2 »
    Sadly Gone: '77 RRC 2 Door aka "Beast"
    Gone: '92 RRC Vogue SE aka "The Family Bus"
    Long Gone: '99 Td5 Defender aka "The TANK!"
    Reply With Quote Reply With Quote
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