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MattHughes86



Member Since: 01 Jun 2019
Location: Gloucestershire
Posts: 140

United Kingdom 2007 Range Rover Supercharged 4.2 SC V8 Zambezi Silver
4.2 Supercharged V8 Issues

Hello all, this my first post and i come with my hands held out for help.

my wife owns the 4.2 V8 supercharged Beast....

we have had coolant issues, i have changed the expansion bottle, this alleviated the constant warning of low coolant...... until today when she jump right up on the temp gauge.....

i run and own a lawnmower repair shop ranging from chainsaws to great big diesel ride on mowers, with that we have a tester for telling when a head gasket has gone... we used it.... and it has gone....

im not afraid of trying new things (this def would be) but im asking for any advice people can give? aka suppliers to steer away from... tools not to use???

at the same time of effecting this repair i will be removing a gas system that was partially installed on the vehicle as well..

Thank you in advance

Post #517168 1st Jun 2019 6:25pm
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kezbo1981



Member Since: 20 Jan 2015
Location: Evesham, Worc
Posts: 334

United Kingdom 2006 Range Rover Vogue SE 4.2 SC V8 Buckingham Blue

Reasonably unusual for head gaskets to go on the supercharged engine, it happens, but make really sure that is your problem as it will be a big job - I might even consider taking the engine out as access will be one of the main issues you face.

Post #517185 2nd Jun 2019 7:46am
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dingg1



Member Since: 29 Jun 2013
Location: PORTUGAL
Posts: 1263

2007 Range Rover Vogue SE 4.2 SC V8 Stornoway Grey

Check its not your lpg system passing gas from the reducer into the cooling system before you go pulling the heads off it .

Good luck

Post #517186 2nd Jun 2019 7:56am
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MattHughes86



Member Since: 01 Jun 2019
Location: Gloucestershire
Posts: 140

United Kingdom 2007 Range Rover Supercharged 4.2 SC V8 Zambezi Silver

i was thinking along the lines of the lpg system. i have never found a filler or switch over button or even the tank..... so i was going to rip it out any way... might try that first and do a full cooling system flush...

Post #517228 2nd Jun 2019 1:20pm
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dingg1



Member Since: 29 Jun 2013
Location: PORTUGAL
Posts: 1263

2007 Range Rover Vogue SE 4.2 SC V8 Stornoway Grey

Whoa

I assumed the system had been commissioned totally different kettle of fish if it isn't.

You need to ask why it was never completed and take things from there

Post #517231 2nd Jun 2019 1:56pm
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MattHughes86



Member Since: 01 Jun 2019
Location: Gloucestershire
Posts: 140

United Kingdom 2007 Range Rover Supercharged 4.2 SC V8 Zambezi Silver

It was like that when we bought it. But definitely going for a full investigation to see if it’s a potential cause and cheap fix.

Any advice considering I have never worked on this engine yet except a new expansion bottle which didn’t work.

Post #517246 2nd Jun 2019 4:46pm
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dingg1



Member Since: 29 Jun 2013
Location: PORTUGAL
Posts: 1263

2007 Range Rover Vogue SE 4.2 SC V8 Stornoway Grey

could be something as simple as an airlock in the cooling system if you have allowed it to go too low a level,

top up the system slowly , there is vent screw on the top of the expansion tank that you can open as the engine warms and you continue to add coolant.

don't you know the history of the car ?

was it always losing coolant when you bought it?

how many times has it overheated?

how much coolant did you have to add?

Post #517249 2nd Jun 2019 5:17pm
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MattHughes86



Member Since: 01 Jun 2019
Location: Gloucestershire
Posts: 140

United Kingdom 2007 Range Rover Supercharged 4.2 SC V8 Zambezi Silver

Roughly a moth ago we had the check coolant lvl message pop up, so we topped up an so forth. i bleed the system but found it was leaking from the bleed screw on the expansion tank....

changed out the tank for a new one, refilled and topped and bleed the system. wife then has riven another 400 odd miles an we have ben checking regularly.

she has got as hot as been just under the red on the gauge luckily the mrs is switched on enough to know to pull over straight away and also get the heater smashing out the heat so fingers crossed no major damage. this has happened a couple of times.

but we also have a snif tester at work so we used it and it turned green which has lead m to believe the gaskets have gone. but i am going to try a full system flush and removing as much of this partial LPG system as poss as well.. before i go for major spanering

Cheers again

Post #517259 2nd Jun 2019 6:07pm
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ukadamwest



Member Since: 22 Dec 2018
Location: Surrey
Posts: 10

United Kingdom 

before you pull it apart. suspecting the HG pull the plugs are any steam cleaned? that would be a good test as would a compression test.

did you replace the t-stat in the housing by the SC.

Post #517545 5th Jun 2019 6:35pm
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MattHughes86



Member Since: 01 Jun 2019
Location: Gloucestershire
Posts: 140

United Kingdom 2007 Range Rover Supercharged 4.2 SC V8 Zambezi Silver

Sadly it is def the head gaskets possibly more,

the thermostat was knackered (not sure if this was the cause or a reaction) there was bassically no fluid left in the system also considering it has been regularly checked and bled,

already got all the water system out of the front end. just about to battle with the fan.

Matt

Post #517598 6th Jun 2019 12:05pm
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Ian928



Member Since: 16 Aug 2016
Location: Kristiansund
Posts: 78

Norway 2006 Range Rover Supercharged 4.2 SC V8 Java Black

There are some hoses under the intake/SC that probably should be renewed or at least checked thoroughly. 2006 Supercharged

Post #517599 6th Jun 2019 12:22pm
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MattHughes86



Member Since: 01 Jun 2019
Location: Gloucestershire
Posts: 140

United Kingdom 2007 Range Rover Supercharged 4.2 SC V8 Zambezi Silver

the idea is the replace all hoses probably go silicon for a bit of bling as its the wifes car

Post #517604 6th Jun 2019 2:06pm
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Strider



Member Since: 08 Jun 2015
Location: Hertfordshire
Posts: 497

England 2007 Range Rover Vogue SE 4.2 SC V8 Zermatt Silver

Sorry to hear of your problems with the 4.2 Matt.

Regarding the silicone hoses, I have been looking for ages with no luck so far.
There are plenty out there for the diesel ones kits, individual hoses etc, if you can find a source let me know i'll do the
same.

Good Luck with your project

Post #517638 6th Jun 2019 6:44pm
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ukadamwest



Member Since: 22 Dec 2018
Location: Surrey
Posts: 10

United Kingdom 

MattHughes86 wrote:
Sadly it is def the head gaskets possibly more,

the thermostat was knackered (not sure if this was the cause or a reaction) there was bassically no fluid left in the system also considering it has been regularly checked and bled,

already got all the water system out of the front end. just about to battle with the fan.

Matt


HG'scan be quite daunting. take your time, follow the workshop manual and you'll do fine. the key is taking your time, its not going anywhere, don't rush it

Post #517660 6th Jun 2019 10:43pm
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MattHughes86



Member Since: 01 Jun 2019
Location: Gloucestershire
Posts: 140

United Kingdom 2007 Range Rover Supercharged 4.2 SC V8 Zambezi Silver

Hello,

can any one tell me the correct way of removing the damn fan?

and as soon as i find silicon hoses i will let you know..

Post #518149 12th Jun 2019 9:52am
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