Discovery 4 Is it my fault- Discovery 4 in hospital.





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  1. #1
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    Default Is it my fault- Discovery 4 in hospital.

    Love my D4. Tons of joy over the last 6 months. But sheís in for a tapit cover replacement at Overland Works. Thatís painful.

    So my question is, did I cause the failure? I had the engine bay steam cleaned while the engine was hot. Could that cause the cover to crack?

    If so, what would happen in very wet conditions

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    Default Re: Is it my fault- Discovery 4 in hospital.


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    Default Re: Is it my fault- Discovery 4 in hospital.

    Iím aware of this thread. I still question if cold water on a hot engine can cause or at the very least exacerbate a crack

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    Default Re: Is it my fault- Discovery 4 in hospital.

    Well, I would need to see the crack, but yes, it is possible. the changes between cold and hot causes expansion and retraction. If this happens rapidly any "weakspot" can be affected and crack. However, I am nost saying that is the case here until I see the crack

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    Default Re: Is it my fault- Discovery 4 in hospital.

    If you are going to use long words, then I would say the propensity for this to happen under those circumstances as described would be indubitable.
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    Default Re: Is it my fault- Discovery 4 in hospital.

    Whether it did or not - there is one thing that we don't do on modern motors and that is wash them. If a customer wants it washed he can do it himself or take it somewhere else.
    There are just way too many and some high voltage items in modern engine bays. Even common rail injectors are fired at well past the old 5v standard what was used. Some like 220v and water in the looms or a plug can cause your management to pop a driver.
    So this is something you should get rid of as a habit in any case. water sprayed in the engine bay from driving / wet conditions are more a vapour than a stream of water from a hose and should not be compared.

    Also NEVER wash a hot engine. if you INSIST on doing it then do it to a cold engine.
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    Default Re: Is it my fault- Discovery 4 in hospital.

    Quote Originally Posted by Stephan van Tonder View Post
    Whether it did or not - there is one thing that we don't do on modern motors and that is wash them. If a customer wants it washed he can do it himself or take it somewhere else.
    There are just way too many and some high voltage items in modern engine bays. Even common rail injectors are fired at well past the old 5v standard what was used. Some like 220v and water in the looms or a plug can cause your management to pop a driver.
    So this is something you should get rid of as a habit in any case. water sprayed in the engine bay from driving / wet conditions are more a vapour than a stream of water from a hose and should not be compared.

    Also NEVER wash a hot engine. if you INSIST on doing it then do it to a cold engine.
    I guess no good deed goes unpunished.

    My late dad insisted that a clean engine bay ensured extra mileage. So itís kind of entrained.

    How would you recommend I keep my engine bay in toptop shape? What do you do when you go through heavy mud?

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    Default Re: Is it my fault- Discovery 4 in hospital.

    Quote Originally Posted by Zapiture View Post
    Love my D4. Tons of joy over the last 6 months. But sheís in for a tapit cover replacement at Overland Works. Thatís painful.

    So my question is, did I cause the failure? I had the engine bay steam cleaned while the engine was hot. Could that cause the cover to crack?

    If so, what would happen in very wet conditions
    Not to debate the do's and don'ts of engine bay cleaning, but surely if it is steam on a hot engine there can't be a huge temperature difference?

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    Default Re: Is it my fault- Discovery 4 in hospital.

    Quote Originally Posted by Zapiture View Post
    Love my D4. Tons of joy over the last 6 months. But sheís in for a tapit cover replacement at Overland Works. Thatís painful.

    So my question is, did I cause the failure? I had the engine bay steam cleaned while the engine was hot. Could that cause the cover to crack?

    If so, what would happen in very wet conditions
    Im not saying it did or did not cause the crack but engines are designed for outside thermal stress , ever seen a car do a deep water wade and alot of steam coming from the engine bay and then no problems with the engine.
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    Default Re: Is it my fault- Discovery 4 in hospital.

    A bit OT in terms of a craced head, but following on comments re engine wash.

    If you have to (and I also have that compulsion)

    Wrap all electronics as far as possible in Glad wrap - it will take you a while to get that sticky sh#*t properly wrapped
    Do not use high pressure
    Try to stay below the waistline (that is in any case where the most muck is)
    Do it only on a cold engine
    Don't spray that thermal/noise lining underneath the bonnet - rather take it out beforehand
    Don't rev immediately after starting- and then take it for a gradual heat up spin

    Just my clueless contribution - ek mag dalk eendag my gat sien

    Enjoy your spotless engine
    Last edited by hatjohan; 2019/08/16 at 03:01 PM.



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    Default Re: Is it my fault- Discovery 4 in hospital.

    Quote Originally Posted by Niela View Post
    Im not saying it did or did not cause the crack but engines are designed for outside thermal stress , ever seen a car do a deep water wade and alot of steam coming from the engine bay and then no problems with the engine.
    The funny thing is that the issue started straight after the engine bay clean. Now it could be just a coincidence but somehow I doubt it.

    Here is the infamous dreaded crack:


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    Default Re: Is it my fault- Discovery 4 in hospital.

    In my experience - and this will cause debate and freak out the "older" folk - leave the engine dirty.

    Any leak - water, oil etc shows up IMMEDIATELY! This mindset recently saved my D3 V8 motor when the dirt showed a water line behind the pulley that turned out to be the thermostat housing. Upon removal it was on the cusp of failing.

    Just saying....
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    Default Re: Is it my fault- Discovery 4 in hospital.

    Quote Originally Posted by JakalasM View Post
    In my experience - and this will cause debate and freak out the "older" folk - leave the engine dirty.

    Any leak - water, oil etc shows up IMMEDIATELY! This mindset recently saved my D3 V8 motor when the dirt showed a water line behind the pulley that turned out to be the thermostat housing. Upon removal it was on the cusp of failing.

    Just saying....
    It's true this. A dusty engine bay shows leaks straight away.

    But oily deposits in my opinion should be cleaned up asap, as they can mask leaks. You don't need water , just a cloth/waster.
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    Default Re: Is it my fault- Discovery 4 in hospital.

    Correct!
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    Default Re: Is it my fault- Discovery 4 in hospital.

    Quote Originally Posted by Zapiture View Post
    The funny thing is that the issue started straight after the engine bay clean. Now it could be just a coincidence but somehow I doubt it.

    Here is the infamous dreaded crack:

    Yeah. Sorry to say but that seems like the weakpoint was found on that bulge. Those are the areas that cannot expand/contract the same as a flat surface. But look on the bright side. You will have a brand new tappet cover now.

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    Default Re: Is it my fault- Discovery 4 in hospital.

    Did you by any chance see my baby at Overland Works? its getting a long range tank fitted
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    Default Re: Is it my fault- Discovery 4 in hospital.

    Quote Originally Posted by DETOUR-GP View Post
    Did you by any chance see my baby at Overland Works? its getting a long range tank fitted
    Unfortunately not. I did not venture into the fitment shop.

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  21. #18
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    Default Re: Is it my fault- Discovery 4 in hospital.

    How much does a replacement tappet cover come in at and approx labour to fit?

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    Default Re: Is it my fault- Discovery 4 in hospital.

    Surely with all the broken-crank engines lying around a second hand tappit cover is easily obtainable?

    Sorry, I see it's a D4, not d3... Maybe there are not many d4's with broken engines lying around...

    indubitably... (I had to look it up)!!!
    adjective
    impossible to doubt; unquestionable.
    Last edited by NewLandy; 2019/08/18 at 01:50 PM.

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    Default Re: Is it my fault- Discovery 4 in hospital.

    Quote Originally Posted by Skylark View Post
    How much does a replacement tappet cover come in at and approx labour to fit?
    Tappet 4k
    All in 12 k......plus R3700 odd for fuel filter service cell. So lets call it 16k

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