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Thread: 1998 2.8L GU ... The dreaded overheating

  1. #11
    Patrol Freak Bush Ranger's Avatar
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    A radiator shroud helps to suck the air through the radiator to aid the cooling effect to happen better apparently. Water pump should be checked to see if it`s all right, but my first thought was head gasket / head.

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  3. #12
    us poms are crap at cricket fracster's Avatar
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    My 2.8 did the same thing mate, it would spew coolant out at 3000 revs and above. The car already had a new water pump, thermostat and all seemed ok. The cylinder head was cracked and started pressurising the system on longer drivers or at high revs. Sorry to be so downbeat, but I would be looking at cylinder head and/or head gasket.

    My ecu was also playing silly buggers, so I got a low mileage 2.8 out of a Y60. No ecu,no MAF, no fly by wire throttle and no electronic fuel pump. It also worked out cheaper swapping the engine than get a head kit and new ecu.
    It is now official, we are not quite so sh@t at cricket as we were! Rugby Union is a different matter.

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  5. #13
    Expert 90mav's Avatar
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    Yep I'd say you are up for at least a new head and all the associated work fitting it. Figure on close to $2k worth of parts and whatever for labour unless you handy with spanners. I just did mine fortunately labour free (well not free but I had a few slack days of work so did it myself) and it has worked out ok. Generally the heads crack and are not worth repairing according to the guy who I spoke to.
    Alternately there has been a few guys around who have just swapped out the RD28 for a Skyline RB25DET motor for around the same money. I reckon that's what I will do if it happens again...
    GQ Wagon 4.2 carb 4inch lift of the road resting
    GU Rd28 Wagon 2 inch lift on the road now daily driver
    D22 Navara ZD30- in rehab pending being moved on.

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    My 2.8 is doing the same thing after a couple of hours of driving so I will be tearing apart the cooling system and looking at the head to see what is going on but it is due for timing belt and everything else so I will be giving everything a good lookover. I'm hoping it isn't too serious.

  7. #15
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    Hi again,

    Since reading this last, I have replaced the radiator, got myself a shroud, and replaced the clutch fan. My mechanic did a CO2 test and told me that the head gasket was fine.

    It seems to have settled down for now (fingers crossed)

    Whilst I'm chatting to knowledgeable guys, what's the deal with the radiator caps? Which one is supposed to have the pressure valve (either the radiator or the header tank, or is it both?)

    Cooky
    Last edited by jcooky90210; 13th May 2014 at 02:01 PM.

  8. #16
    Expert 90mav's Avatar
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    Just the header tank, not radiator.
    Probably would be a good idea to get an engine watchdog for yours. It's cheap insurance. Have a look on ebay
    GQ Wagon 4.2 carb 4inch lift of the road resting
    GU Rd28 Wagon 2 inch lift on the road now daily driver
    D22 Navara ZD30- in rehab pending being moved on.

  9. #17
    Patrol Guru
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    Things that have helped me in the past some have already been mentioned:

    New radiator top/bottom hoses
    New water pump
    New thermostat
    New radiator cap
    New water pump
    New plastic tanks (they come together
    New radiator (3 core instead of the standard 1 core)
    New coolant

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