Advertise on fullfatrr.com »

  • You are currently viewing fullfatrr.com as a guest - Register to take part or Log In
Home > Technical (L322) > 4.2 SC overheating
Post Reply  Down to end
Page 1 of 1
Print this entire topic · 
ivan1566



Member Since: 15 Feb 2019
Location: Dubai
Posts: 19

United Arab Emirates 2012 Range Rover Autobiography Black 5.0 SC V8 Santorini Black
4.2 SC overheating

I have a very weird issue that i cannot resolve.
My top hose blew whilst on the highway after getting a low coolant warning. I got recovered and arranged to replace the top hose.... whilst bleeding the system i also found a chafed expansion tank hose which I also replaced.

Now after following all the procedure for bleeding the engine it appears that all the air is removed. However once under load the engine overheats and starts knocking due to what I assume lack of cooling of the EOC..

I have run a radiator cleaner through it as I think the system is blocked, but this doesn't seem to have helped. I cannot get the bottom hoses off the radiator preventing me from removing the rad... but I have tried to blow water though the system through various hoses and it does seem blocked.

As the EOC doesn't seem to be getting cooled everything to me is pointing to an air lock but having bitten the bullet and put in the garage they have done a pressure and gas test and said that it is losing pressure internally in the engine so requires a full strip down and possible head gasket failure...

What I don't understand though, it there is no white smoke, no oil in water, no water in oil and performance seems fine until the engine gets too hot.....

HELP as I'm reluctant to accept its a blown engine etc.

Post #552495 3rd May 2020 6:08am
View user's profile Send private message View poster's gallery Reply with quote
Spud



Member Since: 12 Jul 2019
Location: Asif by Magic
Posts: 130

England 2006 Range Rover Supercharged 4.2 SC V8 Java Black

Does it only overheat under load? 2006 4.2 SC

Post #552499 3rd May 2020 8:29am
View user's profile Send private message View poster's gallery Reply with quote
ivan1566



Member Since: 15 Feb 2019
Location: Dubai
Posts: 19

United Arab Emirates 2012 Range Rover Autobiography Black 5.0 SC V8 Santorini Black

seems to be... I can have it idling outside the house after bleeding and it doesnt seem to get over hot... plus the gauge is bang on centre.

Post #552501 3rd May 2020 9:05am
View user's profile Send private message View poster's gallery Reply with quote
Spud



Member Since: 12 Jul 2019
Location: Asif by Magic
Posts: 130

England 2006 Range Rover Supercharged 4.2 SC V8 Java Black

Had water pump impellers come adrift before causing similar issues. Would be fine until you drove vehicle. Would be checking that and also the thermostat before pulling the heads. 2006 4.2 SC

Post #552508 3rd May 2020 9:28am
View user's profile Send private message View poster's gallery Reply with quote
ivan1566



Member Since: 15 Feb 2019
Location: Dubai
Posts: 19

United Arab Emirates 2012 Range Rover Autobiography Black 5.0 SC V8 Santorini Black

Many thanks Spud, I'll do that...

Post #552510 3rd May 2020 9:39am
View user's profile Send private message View poster's gallery Reply with quote
ivan1566



Member Since: 15 Feb 2019
Location: Dubai
Posts: 19

United Arab Emirates 2012 Range Rover Autobiography Black 5.0 SC V8 Santorini Black

So, water pump fine and thermostat being changed...... will update once back together.....

Post #552512 3rd May 2020 10:11am
View user's profile Send private message View poster's gallery Reply with quote
dingg1



Member Since: 29 Jun 2013
Location: PORTUGAL
Posts: 1345

2007 Range Rover Vogue SE 4.2 SC V8 Stornoway Grey

Get a sniff test on the coolant done, should confirm whether gaskets are still intact or compromised

Post #552513 3rd May 2020 10:16am
View user's profile Send private message View poster's gallery Reply with quote
dingg1



Member Since: 29 Jun 2013
Location: PORTUGAL
Posts: 1345

2007 Range Rover Vogue SE 4.2 SC V8 Stornoway Grey

Just reread your op and it seems like the garage has already done that, sniff test, you don't want to accept it, soo try the test at another garage, then if you're not going to like to have the heads removed try some k seal repair ointment in there, nothing to lose at that stage.

Post #552514 3rd May 2020 10:19am
View user's profile Send private message View poster's gallery Reply with quote
ivan1566



Member Since: 15 Feb 2019
Location: Dubai
Posts: 19

United Arab Emirates 2012 Range Rover Autobiography Black 5.0 SC V8 Santorini Black

Thanks Dinng1, I was thinking of using the sealant if they come back with the we were unable to fix and a potential for a massive bill.... always a last resort.....

Post #552515 3rd May 2020 10:56am
View user's profile Send private message View poster's gallery Reply with quote
ivan1566



Member Since: 15 Feb 2019
Location: Dubai
Posts: 19

United Arab Emirates 2012 Range Rover Autobiography Black 5.0 SC V8 Santorini Black

Sorry Dinng1, their response was very vague about the sniff test.... didnt say it was the gaskets or not... just said they need to strip down and look at internals..... end of the day if its stripped down they might as well do the gaskets anyway as the labour charge i have to pay anyway..... just dont want to have a massive parts bill on top if i can help it.

Post #552516 3rd May 2020 10:59am
View user's profile Send private message View poster's gallery Reply with quote
Spud



Member Since: 12 Jul 2019
Location: Asif by Magic
Posts: 130

England 2006 Range Rover Supercharged 4.2 SC V8 Java Black

How vague do you need to be on a sniff test? After all you're only testing for hydrocarbons in the coolant system. There either is or is not any. 2006 4.2 SC

Post #552520 3rd May 2020 11:34am
View user's profile Send private message View poster's gallery Reply with quote
ivan1566



Member Since: 15 Feb 2019
Location: Dubai
Posts: 19

United Arab Emirates 2012 Range Rover Autobiography Black 5.0 SC V8 Santorini Black

I know, that's why I was nervous when they said it was head gasket, just as an excuse to charge the labour..... all i got from them was the pressure was leaking....

Post #552522 3rd May 2020 11:37am
View user's profile Send private message View poster's gallery Reply with quote
Spud



Member Since: 12 Jul 2019
Location: Asif by Magic
Posts: 130

England 2006 Range Rover Supercharged 4.2 SC V8 Java Black

Find a different garage with a 4 gas analyser. 2006 4.2 SC

Post #552523 3rd May 2020 11:38am
View user's profile Send private message View poster's gallery Reply with quote
ivan1566



Member Since: 15 Feb 2019
Location: Dubai
Posts: 19

United Arab Emirates 2012 Range Rover Autobiography Black 5.0 SC V8 Santorini Black
Resolved

Thanks All, head gasket had indeed blown... but it didnt get me out of a hefty labour charge for rectification as they chose to remove the engine to do the work....... However, bitten the bullet and had it rectified.
Caused by the blown top pipe through age.

Post #553307 10th May 2020 5:34am
View user's profile Send private message View poster's gallery Post Reply
Post Reply  Back to top
Page 1 of 1
All times are GMT

Jump to  
Previous Topic | Next Topic >
Posting Rules
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum



Site Copyright © 2006-2024 Futuranet Ltd & Martin Lewis
fullfatrr.com RSS Feed - All Forums


Switch to Mobile site