LN106 Hilux Getting hot - what else to look at??

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taubdog
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LN106 Hilux Getting hot - what else to look at??

Unread post by taubdog » November 8th, 2013, 6:59 pm

G'day
I'm A Diesel Mechanic and this has got me STUMPED and are getting over it now..
just wondering if any one cane give me a couple of extra pointers on an overheating problem I have..
the ute has 430,000 KMS and if you push it up to 100KM/h the temp will rise up steadily until 105.C
but Doesn't Boil!!
loaded or un loaded
in any outside air temp

when this first started happening I started off cheap the worked up... these are the repairs I have done all in chasing this problem

New fan Hub
New Thermostat
New radiator Pipes all round
New radiator
new A/C condenser ( to ensure good Air Flow to Radiator )
New coolant
Tried running without Thermostat
Recon Injector Pump
BRAND NEW HEAD (Not Recon!!!) - including Cam, Valves, Valve Springs, Collets,
Blew out and flushed the block whilst the hed was off and inspected internals
Flushed New radiator out
New Water pump
New Fan Shroud


the only thing I haven't replaced is the oil cooler but that is coming

which only leaves the block and pistons haha

it is not a cracked block as the cooling system is not building up any significant pressure and im not using any coolant
it is not using Any oil
dose any one have any idears other then new car haha

Peter Aawen
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Re: LN106 Hilux Getting hot - what else to look at??

Unread post by Peter Aawen » November 8th, 2013, 7:11 pm

If your cooling system is up to scratch & your radiator cap is working OK then your cooling system will have a 'boiling temperature' that is somewhat higher than 100 Deg C, possibly even as high as 120 deg C (but it's worth checking that with the specs!!) and if the cooling system isn't boiling & the engine is not showing any other signs of overheating or being heat stressed, then I don't think you've actually got a problem?? :confused:
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taubdog
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Re: LN106 Hilux Getting hot - what else to look at??

Unread post by taubdog » November 8th, 2013, 8:10 pm

G-day Pete
yes the Cap is working fine with the recovery system
I will look up the factory specs for the cooling system boiling temp, but its still a bit worrying when the standard guadge is just below the red
iv put a new temp sender in as well as a secondary guadge
yes you know the smell when an engine is actually hot
it doesn't have that
but ive never had a ute run this hot b4
thanks for the reply mate

mydmax
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Re: LN106 Hilux Getting hot - what else to look at??

Unread post by mydmax » November 8th, 2013, 8:30 pm

Does it have a bull bar and BIG driving lights?
Is the injection timing correct?
Does it overfuel when throttle is open at higher speeds?
Is the front pulley correctly indication TDC so pump timing can be made to be correct?
Is the exhaust blocked and restricting flow at high temp and outflows? 1 hit or kink and it will restrict.
Has it been underwater in muddy stuff and it has flowed into muffler and then set in there?

taubdog
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Re: LN106 Hilux Getting hot - what else to look at??

Unread post by taubdog » November 8th, 2013, 8:41 pm

Gday Mydmax

I didn't think to check the exhaust !!
dam i'll be annoyed if she has a blocked pipe haha
yes BBar and spotties but nothing over the top as to restrict a lot of airflow id think hey (only small spotties)
timing is correct on the belt as well as the mounting to the timing case
i've done all highway miles in this since about 220,000 Kms and has only started getting hot in the last 100,000 KMs with 430,000 Km on the clock now
not smoky at all for a 2.8 so I don't think it is over fuelling as the pump is new also..

Thanks for the Reply Mate

taubdog
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Re: LN106 Hilux Getting hot - what else to look at??

Unread post by taubdog » November 9th, 2013, 6:13 pm

cut the exhaust off- no different to temperature or performance

vk3aif
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Re: LN106 Hilux Getting hot - what else to look at??

Unread post by vk3aif » November 9th, 2013, 10:36 pm

I had a similar problem and trawled the hilux section of the forums looking for answers and replaced radiator, thermostat and checked everything else I could think of. The only thing left for me was the fan hub and when in a mates 70 series pulling up hill I heard his fan cut in, this I had not heard on my 106 so I got a couple of tubes of silicon grease from the local Toyota joint and added that to the fan clutch making sure it was not overfilled. I have not had the problem since but I still have not noticed the clutch lock up either. Mine only did it on hot days with a head wind at 100 km/p and was the same pre and post turbo but with summer on its way I will probably get my chance soon?

It was suggested on the hilux section that some of the hubs were under filled from new, there is a good right up there on how to check them.

australux
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Re: LN106 Hilux Getting hot - what else to look at??

Unread post by australux » February 27th, 2014, 6:13 am

Residual casting sand in water jackets ?

You might see some grains of sand in the coolant when you first crack the radiator drain plug.


Hope this helps.

SimHilux
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Re: LN106 Hilux Getting hot - what else to look at??

Unread post by SimHilux » March 30th, 2014, 9:18 pm

bump,

Taubdog, Im interested in wether you managed to fix the Hilux cooling problem. Was it the oil cooler behind the oil filter after all that ??

dirtfix
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Re: LN106 Hilux Getting hot - what else to look at??

Unread post by dirtfix » February 7th, 2017, 2:03 pm

Sorry to resurrect an old thread but I am suffering the same problem. Found this link which is what I will be trying next...

http://neuralfibre.com/paul/4wd/tuning- ... fan-clutch
Drive it bro!!!

dirtfix
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Re: LN106 Hilux Getting hot - what else to look at??

Unread post by dirtfix » February 7th, 2017, 2:11 pm

Drive it bro!!!

mydmax
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Re: LN106 Hilux Getting hot - what else to look at??

Unread post by mydmax » February 8th, 2017, 11:49 am

SimHilux

How can an overheating problem be the result of an engine oil cooler?

Does the vehicle have bigger tyres?
Although the injection timing marks are used to set the injection timing, are the marks really correct?
Although a new thermostat is fitted does it have the full size opening and does it really open fully at the stated temp? Many things to check before doing others.
Always double check the simple things first.

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