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Thread: D2 V8 Overheating

  1. 10th August 2015, 11:07 AM #1
    JBM770's Avatar
    JBM770
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    D2 V8 Overheating

    My D2 V8 has recently started overheating again.

    There are no visable coolant leaks and its been doing trips from Newcastle to Erina and back for the past two months.

    When it overheated on Sunday I had driven about 2-3 kms from home.

    Today I drove about 30 kms when it overheated again.

    On Sunday the NRMA mechanic showed me that #3 cylinder was running at about 160 deg on the surface of the head where the others were about 80-100 deg.

    My thoughts are either blocked injector or a dodgy plug for an easier fix or something to do with the valves or piston for a pain in the neck fix.

    If the injector was running lean it could've caused a burnt valve or piston.

    Any thoughts before I rip the whole thing apart again.

    James
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  2. 11th August 2015, 03:53 AM #2
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    sierrafery
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    Just something to be ruled out for peace of mind cos it's simple: when the engine is hot try to stop the viscous fan with a rolled newspaper...if it stops easy that can be part of the problem cos it means it's not locking so no real cooling effect... then put a new viscous unit ASAP
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  3. 11th August 2015, 09:43 AM #3
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    Pedro_The_Swift
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    How did he show you piston temps?
    I wouldve thought a dodgy plug wouldve
    A- been easier to diagnose than piston temps,,
    B- actually made the cylinder run cooler through unburnt fuel?
    "How long since you've visited The Good Oil?"

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  4. 17th August 2015, 09:07 AM #4
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    JBM770
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    The NRMA guy had a laser temp gun and pointed it at the surface of the head.

    Im getting the injectors flow tested today and cleaned if necessary if clogged.

    James
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  5. 17th August 2015, 10:14 AM #5
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    Quote Originally Posted by JBM770 View Post
    The NRMA guy had a laser temp gun and pointed it at the surface of the head.
    I bought one of those things and they are an easy way to make big errors unless the surface you're measuring has been carefully prepared to certain specs, eg covered in a thin layer of matt black paint. The laser is just a guiding mark, the actual sensing covers a wider area and is really only good for displaying differences between subsequent readings. I bought mine to read the temperature of a return pipe from my solar HWS and readings along 1m of plumbing can vary by 20 degrees, depending on how you hold the tool and what the surface is like. The "hottest" surface I tested with the tool was the vinyl pillar cover on a RRC out in the full sun, near 100C yet I could touch it and not burn my finger.
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  6. 17th August 2015, 10:56 AM #6
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    I understand what your saying about the temp gun.
    With that in mind I'll use the info as advisory and look at other sources for possible causes as less intrusive things are eliminated.

    James
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