Toyota Cracked heads 3L diesel - heard of any on Prado's or Hilux's

Submitted: Saturday, Aug 14, 2004 at 17:25
ThreadID: 15560 Views:18055 Replies:5 FollowUps:8
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I've got the 1KZ-TE diesel 3L motor which is the same as in the hilux and the Prado. Mine is a 97 Surf which I know earlier models had head problems but there have been no problems with the 1KZ-TE motor to my knowledge ! Has anyone heard of the 1KZ-TE motor cracking heads in the Prado or Hilux. Mine also has a factory intercooler, but still I have discovered that my head is cracked. Is this a trait of this motor aswell or for alloy head diesels in general ?
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Reply By: Yeah Mate - Sunday, Aug 15, 2004 at 02:42

Sunday, Aug 15, 2004 at 02:42
Jeff,

Not as I have heard, usually most cracked heads happen as a result of excess alcohol, sorry wrong head But seriously folks, I have found most causes to be lack of maintenance to the cooling system i.e.; lack of coolant/$hit water added to system leading to corrosion. Leaking/inefficient cooling and/or bad luck (stone though radiator etc.) leading to overheating, also incorrect assembly procedures lack of prep or wrong torque sequences/tensions.

Jeff you say; I have discovered that my head is cracked have you had somebody to diagnose it for you or are you loosing water or oil in water or water in oil ?
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Reply By: Phil G - Sunday, Aug 15, 2004 at 10:47

Sunday, Aug 15, 2004 at 10:47
Hi Jeff,

I've had a diesel Prado since they were released in 2000. At the time, Toyota said they delayed the release of the diesel model because of changes they wished to make to the cylinder head, cooling system and air conditioner to cope with Aussie conditions. So I'm guessing that there are differences with the Aus spec motors.

I've been on the 90series group since it started and have not heard of any cracked heads on diesel Prados.

Cheers
Phil
AnswerID: 72668

Follow Up By: GO_OFFROAD - Monday, Aug 16, 2004 at 11:53

Monday, Aug 16, 2004 at 11:53
Phil,
I think you will find if you search the archives, you will see there has been a 90 with a cracked head who posted it on the 90 lists, Simon Christies 90 series had a cracked head just after xmas last year, from the injector hole, he traded it on a 120 series after he had it repaired when they were first released, he was on 90series as well as 90scool_aus list and is now on 120scool email list at www.lcool.org

Surfs with cracked heads I have heard 2nd hand, but not seen any, are apparently an issue in New Zealand, where many have been imported, havent heard of many here.
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Follow Up By: Phil G - Monday, Aug 16, 2004 at 20:34

Monday, Aug 16, 2004 at 20:34
Thanks for pointing that out Darren. I found that post in the archives - August last year. Sounded like they replaced the head several times and the block once before working out where the crack was. Ended up being at the injector hole on 3rd cylinder.
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Follow Up By: GO_OFFROAD - Monday, Aug 16, 2004 at 20:46

Monday, Aug 16, 2004 at 20:46
No worries Phil,
had to crack test the head with the injectors in place to find it from memory.
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Reply By: Member - Bernie. (Vic) - Sunday, Aug 15, 2004 at 20:55

Sunday, Aug 15, 2004 at 20:55
Hi Jeff may not help you but I'M sure the radiator in the Surf is much smaller than in the Prado TD.

Cheers
AnswerID: 72728

Follow Up By: GO_OFFROAD - Monday, Aug 16, 2004 at 11:54

Monday, Aug 16, 2004 at 11:54
The surf also had no intercooler to keep inlet temps down either.
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Follow Up By: Member - Jeff M (WA) - Monday, Aug 16, 2004 at 12:05

Monday, Aug 16, 2004 at 12:05
Jeff's surf does have a factory intercooler as it is the newer KZN-185 model, same running gear and motor/turbo/intercooler setup as the 90 Prado.
My surf (kzn-130) has the same 1KZ-TE motor, but 4 runner running gear and not intecooler.
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Follow Up By: GO_OFFROAD - Monday, Aug 16, 2004 at 12:08

Monday, Aug 16, 2004 at 12:08
OK, the models I have heard of the issue with are the non intercooled version.
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Reply By: Member - Jeff M (WA) - Monday, Aug 16, 2004 at 12:13

Monday, Aug 16, 2004 at 12:13
Mate I have heard (second hand also) of 1kz-te's cracking heads but mainly because of prior overheating issues due to a lack of maintencance in the cooling system, or people running water in the cooling system instead of a corrosion inhibitting coolant.

With an alloy head you only have to get it hot once or twice and it might seem fine, but then 6 months later "CRACK".

People seem to think that if it get's hot it's ok as long as it does not hit the end of the temp guage, but uh uh, if it's getting up there, back off and let it drop down to running temp and then get your cooling system serviced staight away.
Sorry to here about your cracked head...
have you had a quote on getting it repaired/replaced yet? I'd be interested to know what your looking at.

AnswerID: 72779

Follow Up By: Jeff (Beddo) - Monday, Aug 16, 2004 at 19:58

Monday, Aug 16, 2004 at 19:58
Hey Jeff, good to see someone else spells Jeff correctly. Your quite right in the need to maintain the cooling system, what you have said fits my story. In January I went to Canberra drom Gosford and the temp went right up there on hills, I tried to keep it down but it was sitting atleast 3/4 way, when usually it sits just below half and does not move. Well when we got back I got the radiator checked and yes poor maintainance with old coolant had clogged up the radiator, anyway got it fixed and all seamed fine running up and down the F3 to Sydney & back, but then we went to the snow and just before Tumut the temp rose again - I guess when we originally heated up the motor the damage was done. Costs will be $1650 for a second hand reconditioned head with valves etc all set up on it; otherwise a new head would cost $1700 and I would have to fit and set my valves etc in to the new one. All up probably cost $3300. Anyway these damn alloy heads are not like my old XW V8 Fairmont they are bullet proof being cast iron everything.
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Follow Up By: Member - Jeff M (WA) - Tuesday, Aug 17, 2004 at 11:08

Tuesday, Aug 17, 2004 at 11:08
LOL - Yeah mate, it's the only bloody thing I can spell right!!
Yeah I know what you mean, my mate has just recently bought a wide track feroza and is used to his old kingswood. That thing used to go up to 130c in the drive throughs!! Didn't bother it though, it just kept going and going!
The frozi overheated on the weekend when we were being a little silly and racing each other in the pinjar pines down this 4 lane wide sand track fire brake thing that divided the open space to the air force firearm training ground, going flat out for about 10 minutes in deep sand side by side, then my viscous fan cut in and he left me behind as the surf started to loose power with the fan fully locked. (no temp problems though!!). Then about 2 minues later I going screaming past him as he's stopped on the side of the track. Turns out his viscous fan was stuffed and was'nt even slightly locked in.
I told him off, gave him a lecture! "This isn't a friggin kingswood mate, don't do that do it, don't let it get hot!"
$3k hey... Is it worth investing in a torque rench and doing it yourself? I have the 1kz-te toyota service manual in .PDF format, I'm sure it would have all the info you need... At least then you might save a grand or so...
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Reply By: Vader - Thursday, Aug 19, 2004 at 21:03

Thursday, Aug 19, 2004 at 21:03
I have heard of quite a few imported Surf's suffering cracked heads when operating in hot northern Australia conditions. this may be due to poor cooling system maintenance - which is quite often overlooked in cars that don't do many km for their age - such as Jap imports.

However I have also heard that Toyota has specifically made modifications to Hilux and Prado engines for use in Australia over their standard items.

I purchased a second hand japanese import engine for my Corolla once. I found that the engine model number was the same as what I had previously (Aus compliance) but found that ignition timing, spark plugs, and valve clearances all had to be set differently. When I queried this with both Toyota and the supplier of the engine the response I received was that the head was of a slightly different design. Hence different gas flow path, and different comp ratio can result as an example.

I know that most of the above is here-say but most of the evidence stacks up...

I came close to buying Surf, but I ended up putting the extra cash into new Aus Compliance 3TD Hilux.
AnswerID: 73324

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