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Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6355
Reply | QUOTE
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.

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Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
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9/Jan/2021, 8:50 pm Link to this post Send Email PM   Send Private Message Blog
 
Sirkev Profile
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Date Registered: 08-2015
Location: Yanchep
TOTAL POSTS: 11
Reply | QUOTE
Re: Head gasket blown


You were right Kev.

The temp sensor was not turning the fans on at all. When I disconnected the sensor plug the fans ran at low speed.

I have ordered a new temp sensor and I hope that this is the underlying problem that caused the overheating in the first place. I think that you may have saved me the cost of a radiator upgrade.

thanks for the help.

Sirkev

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Kev
2007 T31 Manual petrol, 17 inch alloys, JVC 12 CD stacker in diamond white.
X-4312
11/Jan/2021, 10:00 pm Link to this post Send Email PM   Send Private Message Blog
 
Sirkev Profile
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Date Registered: 08-2015
Location: Yanchep
TOTAL POSTS: 11
Reply | QUOTE
Re: Head gasket blown


Hi Revhead Kev

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?

On a cold engine removing the temp sensor connector turns the fans on. Bridging the connector with 150 ohm resistor turns the fans off.

I am starting to doubt my head gasket hypothesis. Motor gets hot after about 100km at 110km/hr on hot days. I can control it by turning the heater on. Not losing much coolant. About 500ml on a 250km trip when hot.

I cannot do a compression check because my gauge does not have a 12mm adaptor. Motor runs well.

Work done:
Radiator removed and flushed upside down with water. Looks OK, water flows through easily.
New radiator hoses.
New Temperature sensor.
2 New thermostats
Have not yet fitted the water pump I bought.

I did find some scale on the old sensor and thermostats, but the housings and hoses look clean.

BTW the ECU doesn't like it if you remove the temp sensor connector before trying it start the motor. It just starts and instantly turns off.

Sirkev

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Kev
2007 T31 Manual petrol, 17 inch alloys, JVC 12 CD stacker in diamond white.
X-4312
23/Feb/2021, 7:13 pm Link to this post Send Email PM   Send Private Message Blog
 
Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6355
Reply | QUOTE
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.

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Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
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23/Feb/2021, 7:42 pm Link to this post Send Email PM   Send Private Message Blog
 
Jdubs88 Profile
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Date Registered: 09-2020
TOTAL POSTS: 8
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Re: Head gasket blown


Hey Ya'll,

I'm another to join the BHG club. Thought I'd share my experience.

So noticed my x-trail ( T30 2002, T30 235,000kms) running pretty sluggish for a while and then coolant reservoir started emptying within a day or so. Never overheated during this time (or could have been faulty temp gauge or thermostat), but eventually started blowing white smoke and running real rough on start up

I took it to a mechanic in here in Brisbane for an o2 test and compression test. I asked for a report on the findings before any work was to commence. No report provided, but just a list of parts required and maintenance was sent (see below):

"Including labour to remove and replace

New cylinder head
Vrs gasket kit
Head bolts
Oil and filter
Coolant
Thermostat
Hose clamps
Workshop supplies (ummm...What!? like gloves mate?!)

Total: $4565"

I thought this was a rather exorbitant price. The point im wanting to make here is that it's always worth getting a second opinion!

I called my family mechanic who we've been taking our cars to for 15 years for advice. He quoted me $3200 with a new radiator. So with the tow from Brisbane to Cooroy (sunshine coast) which was $250 I'm still saving over 1K.

I am yet to get the vehicle back, as our mechanic is always booked about a week in advance, I will report once I know more!

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Josh W.
Location: Brisbane/Sunshine Coast
2001 Nissan X-Trail T30 ST
225,xxx Km's
Membership ID:X-5914
12/Apr/2021, 10:01 pm Link to this post Send Email PM   Send Private Message Blog
 
Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6355
Reply | QUOTE
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 ?

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Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
My Blog
My CarPC Worklog
13/Apr/2021, 8:27 am Link to this post Send Email PM   Send Private Message Blog
 
Jdubs88 Profile
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Date Registered: 09-2020
TOTAL POSTS: 8
Reply | QUOTE
Re: Head gasket blown


Unclear if there was a crack in the head, hence why I wanted a detailed report sent of what they found, rather than just a parts list. They did tell me there is was a leak internal, but how do I know they're not just telling me this?

Our trusted mechanic said he can do the same work outlined above for $1000 less. At the end of the day, I would rather send him the work, even if it does cost more.

---
Josh W.
Location: Brisbane/Sunshine Coast
2001 Nissan X-Trail T30 ST
225,xxx Km's
Membership ID:X-5914
13/Apr/2021, 1:25 pm Link to this post Send Email PM   Send Private Message Blog
 
Skiip32 Profile
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Date Registered: 02-2024
Location: Blue Mountains
TOTAL POSTS: 3
Reply | QUOTE
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.

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2006 x-trail ST-S 40th anniversary
The Blue Mountains NSW
29/Feb/2024, 3:05 pm Link to this post Send Email PM   Send Private Message Blog
 
Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6355
Reply | QUOTE
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.

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Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
My Blog
My CarPC Worklog
29/Feb/2024, 10:56 pm Link to this post Send Email PM   Send Private Message Blog
 
Skiip32 Profile
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Date Registered: 02-2024
Location: Blue Mountains
TOTAL POSTS: 3
Reply | QUOTE
Re: Head gasket blown


Thanks for the advice! I’ll check in with the mechanic about what type of gasket they intend to use. I’ll check in with them about the timing chain also.

I can see you’re in Sydney, do you mind me asking who you had recondition your engine and what sort of ballpark figure I’d be expecting?

I’m currently using 10W40 for oil after reading some posts on this forum recommending it. But can switch to 5W40 if this could prove problematic.

---
2006 x-trail ST-S 40th anniversary
The Blue Mountains NSW
2/Mar/2024, 7:50 pm Link to this post Send Email PM   Send Private Message Blog
 


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