Revhead Kev
Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6355
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Re: Head gasket blown
The dual speed fan will always be on when the aircon is on.
Best way to test the fans is to have the aircon off and as the temp gauge rises to operating temp the fans should cut in and out at low speed.
After this is confirmed, disconnct the temp sensor plug and use a 150 Ohm resistor to connect across the 2 plug pins and the dual speed fan should run at high speed. Do this just long enough to test the high speed so that the temp sensor plug is not disconnected for too long. A minute should be enough time to check.
--- Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
My Blog
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9/Jan/2021, 8:50 pm
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Revhead Kev
Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6355
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Re: Head gasket blown
quote: Sirkev wrote:
When I disconnected the sensor plug the fans ran at low speed.
quote: Sirkev wrote:
IF bridging the wiring on the temp sensor wiring with a 150 ohm resistor results in the running fans turning OFF is it an indicator of a faulty relay?
These two points sound as though the relay is a Normally Closed (NC) relay instead of a Normally Open (NO) relay type.
I suggest you pull both fan relays and check they are the correct type.
--- Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
My Blog
My CarPC Worklog
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23/Feb/2021, 7:42 pm
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Revhead Kev
Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6355
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Re: Head gasket blown
Replacing the cylinder head in the first quote would have been the main part of that cost.
I would have asked why they thought it needed replacing. Maybe they might have found a crack that your trusted mechanic has not ?
--- Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
My Blog
My CarPC Worklog
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13/Apr/2021, 8:27 am
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Skiip32
X-TRAIL NEWBIE
Date Registered: 02-2024
Location: Blue Mountains
TOTAL POSTS: 3
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Re: Head gasket blown
Hi all!
I’m unfortunately a new member of the BHG club. Sorry for the long post!
TL;DR - head gasket has blown, holding up with a sealant. Never over heated only drivability complaints was intermittent misfire in cylinder 1 with rough idle only on start up. Realised coolant was low with routine check - none in overflow, couldn’t see any in radiator.
Options are replace head gasket, 2nd hand engine or trying to find someone to recondition the entire engine. I want this car for at least another 5 years (hopefully much more) and given used car prices it’s likely I’d end up with another car needing expensive repairs. Any advice from the wise? Do I just cut my losses and buy another exy and hope for the best? Located in the upper Blue Mountains of NSW.
Continue on for context and history if you like.
Purchased my xtrail a year ago 2nd hand after having a 4WD specific pre purchase inspection done. Unfortunately the car had no formal records of service history. But with a car of this age it was proving difficult to find any with records to begin with.
The story so far:
- 1 wheel bearing and hub, all new tyres, need to do rear diff bushings (clunking noise from rear when coming to a complete stop). Mechanic advised waiting until they’re worse to save on labour?
- manifold catalytic converter (throwing P0420). No drivability problems.
- engine oil leak from rocker cover gasket. My mechanic “repaired” the gasket. Sorry can’t say what was done.
- intermittent misfire in cylinder 1 with rough idle on start up that resolved after a few seconds. Present before and after catalytic converter replacement.
- noticed previous owner used generic green coolant and as per advice had my mechanic flush the system, when doing so the radiator “fell apart” and a new one was put in.
- low air pressure when AC is on. Haven’t started looking into this yet.
Head gasket:
- loss of coolant in overflow and radiator, no external leaks, no new drivability problems before checking coolant levels routinely. Mechanic confirmed blown head gasket with pressure test and dye Check. Put a head gasket sealant in the cooling system. No more coolant loss, no overheating ever occurred, but I only do short distance drives (max 20kms in 80km/hr speed limited). I’d like to travel on long trips but I’m worried about engine damage.
This was back in November and I’ve not had anymore engine misfires or coolant loss. Mechanic said coolant was leaking into cylinder from head gasket. I checked the oil recently and there was barely on the dipstick - took 1L to get back to H. This was after doing a 25km drive back up the mountain (first time since the sealant was put in for the BHG). No oil loss since - approximately 400km of driving since topping up.
I’ve asked around a number of mechanics for opinions and repair costs.
Mechanic 1: estimated 3-5K but recommended just leaving the sealant until it goes again.
Mechanic 2: said they don’t recommend head gasket repairs because they don’t “hold up” and claimed x-trails don’t have a history of BHG… recommended 2nd hand engine with 180,000kms for $5500.
Mechanic 3: said he would rather work on my engine then get an unknown engine in. Is doing me up an estimate for head gasket as well as doing water pump, thermostat and checking my new radiator to ensure the cooling system is all good. I don’t want another BHG.
Engine specific mechanic: requested estimate to recondition the whole engine.
--- 2006 x-trail ST-S 40th anniversary
The Blue Mountains NSW
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29/Feb/2024, 3:05 pm
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Revhead Kev
Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6355
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Re: Head gasket blown
I had my engine reconditioned at 190K to replace a stretched timing chain and bent piston rod from being hydrolocked after ingesting water from a creek crossing.
Points to note about the engine...
- with 160K on your engine it might be worth having the timing chain replaced as well, especially if you hear rattling at startup. This will involve removing the engine with higher labour charges.
- if you only need to have the head gasket replaced, it should be able to be done without removing the engine.
- always have the head shaved flat when replacing the head gasket and ALWAYS use a multi-layer metal (MLS) gasket, thicker than normal. The timing chain tensioner does not have a lot of take-up and the small loss of thickness when shaving the head will cause the chain to be loose with the tensioner at full takeup, possibly causing a skipped tooth on a cam sprocket.
- oil should be 5W-40 (not 30) for our hot temperatures to ensure there is enough oil pressure for the timing chain tensioner.
--- Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
My Blog
My CarPC Worklog
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29/Feb/2024, 10:56 pm
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